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Papers by alessio casucci

Research paper thumbnail of Accuracy of Four Intra-Oral Scanners in Subgingival Vertical Preparation: An In Vitro 3-Dimensional Comparative Analysis

Materials

One of the most critical aspects in intraoral impression is the detection of the finish line, par... more One of the most critical aspects in intraoral impression is the detection of the finish line, particularly in the case of subgingival preparations. The aim of this in vitro study was to evaluate the accuracy among four different Intra Oral Scanners (IOSs) in scanning a subgingival vertical margins preparation (VP). A reference maxillary typodont (MT) was fabricated with a VP for full crown on #16 and #21. The MT was scanned with a laboratory scanner (Aadva lab scanner, GC, Tokyo, Japan) to obtain a digital MT (dMT) in .stl format file. A group of 40 digital casts (dIOC) were obtained by scanning the MT 10 times with four different IOSs: Trios 3, 3Shape A/S; I700, Medit; Vivascan, Ivoclar; and Experimental IOS, GC. All the obtained dIOCs were imported into an inspection software program (Geomagic Control X; 3D SYSTEMS) to be superimposed to the dMT in order to calculate trueness. Therefore, in order to calculate precision, all the scans of the same scanner group were superimposed ont...

Research paper thumbnail of Accuracy, time efficiency and operator preference in edentulous arch scanning: a preliminary report: a preliminary report

Journal of Osseointegration, Sep 29, 2021

Aim The present in vitro study evaluated the accuracy of intraoral scanners (IOS) in a completely... more Aim The present in vitro study evaluated the accuracy of intraoral scanners (IOS) in a completely edentulous arches and analyzed the influence of operator experience on accuracy, also time efficiency and operator's difficulty perception related to IOS procedures. Materials and methods Twenty participants were enrolled for the digital scanning procedure of a maxillary edentulous metal model using an intraoral scanner, Aadva iOS100 (GC Corp., Tokyo, Japan). Participants were divided in two groups according to their experience in intraoral scanning procedures: Inexpert (InE group) without any experience in dental scanning (n=10) and Experts (E group) composed of operators with at least 3 year of scanning experience with IOS (n=5). Five IOS procedures were repeated for each operator and exported as a correspondent Stereolithography (STL) file. The same model was scanned with a laboratory scanner (LSS) (D1000 3 Shape Copenaghen Denmark), obtaining an STL file of the model which has been used as a reference. Accuracy of IOS were evaluated using a surface adaptation software (Geomagic Design X). The time required for each scanning procedure, and the perceived difficulty level were recorded for all the participants. The data obtained about accuracy, scanning time and difficulty perceived were compared between the two groups using the T-test for independent samples. The same variables were also correlated with each other using the Pearson's coefficient. Results The highest trueness was observed for the scans provided by E participants. Precision ranged from 95,89 to 79,36 respectively in E and InE operators. For both trueness and precision there were significant differences between the two groups (p<0.05). Regarding scanning time, the more experienced operators were faster than inexpert ones with a significant difference (p<0.001). The two groups reported also differences in terms of difficulty perceived. Pearson's correlation reported for time scanning a significant correlation with trueness p<0.001 and precision p<0.05 and between difficulty perceived and trueness p<0.05. Conclusions Digital impressions accuracy was different in E and InE operators as well as the scanning times, that was correlated with both trueness and precision.

Research paper thumbnail of Influence of different surface treatments on surface zirconia frameworks

Journal of Dentistry, Nov 1, 2009

ObjectivesTo evaluate the effect of different chemo-mechanical surface treatments of zirconia cer... more ObjectivesTo evaluate the effect of different chemo-mechanical surface treatments of zirconia ceramic in the attempt to improve its bonding potential.

Research paper thumbnail of Digital Impressions in Edentulous Patients: A Systematic Review for Clinical Evidence

The International Journal of Prosthodontics

Research paper thumbnail of One-Year Multicenter Randomised Controlled Trial Comparing OT Equator® and Locator Attachments to Retain an Early Loaded Implant Overdenture on Two Implants

International Journal of Biomaterials

This investigation aimed to compare the effectiveness of the OT Equator® (Rhein, Bologna, Italy) ... more This investigation aimed to compare the effectiveness of the OT Equator® (Rhein, Bologna, Italy) and the Locator attachment systems used to retain early loaded implant-retained overdentures. This study was designed as a multicenter randomised controlled trial of parallel groups. After implant placement, the patients were randomised to receive OT Equator® attachments in the test group or Locator attachments in the control group. The outcome measures were implant and prosthetic success and survival rates, any biological and technical complication, marginal bone loss, patients’ satisfaction, and periodontal parameters. Overall, 42 patients were consecutively enrolled and treated. One implant was lost in the control group, while no implants were lost in the test group. No prostheses failed in both groups. Only a few complications were experienced in both groups. The main was represented by loss of retention of the attachments (retentive caps). The OT Equator® attachment showed statistic...

Research paper thumbnail of Accuracy, time efficiency and operator preference in edentulous arch scanning: a preliminary report

Journal of Osseointegration, 2021

Aim The present in vitro study evaluated the accuracy of intraoral scanners (IOS) in a completely... more Aim The present in vitro study evaluated the accuracy of intraoral scanners (IOS) in a completely edentulous arches and analyzed the influence of operator experience on accuracy, also time efficiency and operator’s difficulty perception related to IOS procedures. Materials and methods Twenty participants were enrolled for the digital scanning procedure of a maxillary edentulous metal model using an intraoral scanner, Aadva iOS100 (GC Corp., Tokyo, Japan). Participants were divided in two groups according to their experience in intraoral scanning procedures: Inexpert (InE group) without any experience in dental scanning (n=10) and Experts (E group) composed of operators with at least 3 year of scanning experience with IOS (n=5). Five IOS procedures were repeated for each operator and exported as a correspondent Stereolithography (STL) file. The same model was scanned with a laboratory scanner (LSS) (D1000 3 Shape Copenaghen Denmark), obtaining an STL file of the model which has been ...

Research paper thumbnail of Flexural Strength Analysis of Different Complete Denture Resin-Based Materials Obtained by Conventional and Digital Manufacturing

Materials

PMMA (Polymethylmethacrylate) is the material of choice to fabricate denture bases. Recently, wit... more PMMA (Polymethylmethacrylate) is the material of choice to fabricate denture bases. Recently, with the introduction of CAD-CAM and 3D printers in dentistry, new materials have been proposed for complete denture manufacturing. Aim: This study compared the flexural strength of different resins fabricated using different technologies (conventional, CAD-CAM-milled, and 3D-printed) and polymerization techniques. Methods: A total of 11 different resins were tested: six PMMA conventional (Acrypol R, Acrypol LL, Acrypol HI, Acrypol Fast, Acryself and Acryslef P), two milled obtained from UDMA PMMA disks (Ivotion disk and Aadva disk, control groups), two 3D-printed PMMA resins (NextDent Denture 3D+, and SprintRayEU Denture Base), and one 3D-printed composite resin (GC Temp Print). Flexural strength was measured using a universal testing machine. One-way ANOVA and Bonferroni post hoc tests were performed; the p-value was set at 0.05 to consider statistically significant differences among the ...

Research paper thumbnail of Digital workflow in complete dentures: a narrative review

Journal of Osseointegration, 2020

Aim The aim of the present study is to review the literature evaluating the main steps required i... more Aim The aim of the present study is to review the literature evaluating the main steps required in complete denture rehabilitation in case of edentulous jaws in the digital workflow. Methods This review was conducted using PubMed and Scopus databases. It focuses on the following clinical and laboratory steps: the impression, the registration of the centric relation, the try-in and the finalization. Results According to the reported data in literature, impression, try-in and finalization are feasible with a complete digital approach. Registration of the centric is possible only combining the digital with the traditional one. Digital impression is accurate, but shows some limitations in the peripheral areas. The printing process, because of accuracy and its cost, can be used for the try-in of the prototype. Milling machine is more accurate than 3D printing and offers a good level of retention and of satisfaction for the patient. Conclusions In relation to optical scanning, there are...

Research paper thumbnail of Study

Phonetic analysis and maxillary anterior tooth position: a pilot

Research paper thumbnail of Feasibility of Low Profile Attachments to Improve Quality of Life on Patients with Implant-Retained Mandibular Overdenture: 1-Year Preliminary Results of a Multicenter Prospective Case Series Study

Aim: The purpose of this multicenter prospective case series study evaluated peri-implant margina... more Aim: The purpose of this multicenter prospective case series study evaluated peri-implant marginal bone loss, complications, oral health impact profile, and soft tissue parameters in patients with mandible implant overdenture retained on two low profile attachments. Methods: This study was designed as a multicenter prospective case series study conducted according to the Declaration of Helsinki of 1975, as revised in 2008. Patients that required an implant-retained overdenture to rehabilitate a complete edentulous mandible were considered eligible for this research. Patients were consecutively enrolled and treated in seven centers in Italy between February 2012 and March 2017. The last follow-up was in May 2018. Results: A total of 40 mandibular implantretained overdentures were delivered on 40 participants (26 females and 14 males) with a mean age of 67.5 years. All the participants were followed for at least one year (mean 21.3 months, range 12 to 60) after implant loading. At the...

Research paper thumbnail of OT-Equator® Attachments Comparison for Retaining an Early Loaded Implant Overdenture on Two or Three Implants: 1 Year RCT Preliminary Data

Applied Sciences, 2021

The purpose of this multicenter randomized controlled trial was to compare the clinical, radiogra... more The purpose of this multicenter randomized controlled trial was to compare the clinical, radiographic, and patient-centered outcomes of early loaded mandibular overdentures deliberately placed on two or three implants. The outcomes were: implant and prosthesis success and survival rates; biological and technical complications; marginal bone loss; patient satisfaction; and periodontal parameters. The results showed no differences between the groups in any of the outcomes analyzed. With the limitations of the present study, and looking at long-term follow-up, the gold standard of prosthetic rehabilitations with attachments, in agreement with the scientific community, should prefer two non-splinted implants.

Research paper thumbnail of Multicenter retrospective analysis on survival rate, complications, patient satisfaction and biological parameters of implant overdentures delivered with different design and attachment systems- results between 1 and 17 years of follow-up

Clinical Oral Implants Research, Oct 1, 2018

Research paper thumbnail of Multicenter Retrospective Analysis of Implant Overdentures Delivered with Different Design and Attachment Systems: Results Between One and 17 Years of Follow-Up

Dentistry Journal, 2018

Purpose: To analyze implant and prosthetic survival rates, complications, patient satisfaction, a... more Purpose: To analyze implant and prosthetic survival rates, complications, patient satisfaction, and biological parameters of patients rehabilitated with implant overdentures (IOV) on splinted and nonsplinted implants and different attachment systems, in function for one to 17 years. Methods: This retrospective study evaluated data collected from patients rehabilitated with implant overdentures between January 2001 and December 2016 in nine different centers. Outcome measures were implant and prosthetic success rates, mechanical complications, marginal bone loss (MBL), oral health impact profile (OHIP), bleeding on probing, and plaque index. Results: A total of 581 implants were installed in 194 patients. Patients were followed for a mean period of 60.6 months (range 6–206). Eighty-nine patients received 296 low profile attachment (OT Equator), 62 patients received 124 ball attachments, and 43 patients received 107 Locator attachments. In eighty-three patients the implants were splin...

Research paper thumbnail of Surface treatment effects on three zirconium-oxide ceramics

Objectives: To estimate the effects of chemo/mechanical treatments on the surface of three differ... more Objectives: To estimate the effects of chemo/mechanical treatments on the surface of three differently marketed zirconia ceramics using scanning electron and atomic force microscopy evaluations. Materials and Methods: Cylinder-shaped disks ( 10x1 mm height) were obtained from three sintered zirconium oxide ceramics (Lava, Cercon and experimental GC). Blocks were conditioned with (n=3): 1) Airbone particle abrasion with 125 m Al2O3 particles; 2) Selective infiltration etching (SIE); 3) Experimental hot etching solution applied for 30 min (ST); 4) No treatment. The average surface roughness after each conditioning protocol was assessed using an Atomic Force Microscopy (AFM) and evaluated by a single operator. Data were statistically analyzed with the Two-way ANOVA and the Games-Howell tests (p<0.05). The same discs were observed under a Scanning Electron Microscope (SEM) for a bi-dimensional zirconia surface ceramic characterization. Results: The factor surface treatment significan...

Research paper thumbnail of Self-adhesive resin cement bonding to zirconia ceramic after different pre-treatments

Objectives: To evaluate the influence of different surface treatments and metal primer applicatio... more Objectives: To evaluate the influence of different surface treatments and metal primer application on bond strength of zirconia ceramic to a self-adhesive resin cement. Methods: : Forty cylinder-shaped (Ø 12 X 5.25 mm high) of zirconia ceramic (Aadva Zirconia, GC) were randomly divided into 4 groups (n=10), based on the surface treatment to be performed: 1. Sandblasting with 125 µm Al2O3 particles (S); 2. Selective infiltration etching (SIE); 3. Experimental hot etching solution applied for 30 min (ST); 4. No treatment (C). Half of the zirconia specimens of each group received the application of Metal Primer II. An amount of eight disks for each group were luted used using a self-adhesive resin cement (G-Cem Automix, GC) to composite overlays (Paradigm MZ100, 3M ESPE). After 24 h bonded specimens were cut into microtensile sticks and loaded in tension until failure. Data were analysed with two-way ANOVA and Games-Howell (p<0.05). Failure mode distribution was recorded and scannin...

Research paper thumbnail of Influence of sandblasting on surface roughness of two zirconia ceramics

Bond strength between ceramic materials and luting cements may be improved if ceramic surface rou... more Bond strength between ceramic materials and luting cements may be improved if ceramic surface roughness is increased. Objective: The aim of this study was to compare the influence of sandblasting treatment on surface roughness of one zirconia ceramics: LAVA (3M ESPE) and one experimental zirconia ceramic GC (GC, Corp.). Methods: Ceramic surfaces were treated as follows: Sandblasting with 125 mm aluminum-oxide (Al2O3) particles; 2) no treatment. Digital images (100x100 microns) from the surfaces were obtained by means of an AFM microscope in taping mode (Nanoscope IIIa- Digital Instruments). Roughness was measured in 20x20 microns boxes. Roughness (Ra) data (nm) were analyzed by One-way Anova and Student t test (p<0.05). Results: Mean roughness (Ra-nm) and standard deviations are presented in the table. Different letters indicates significant differences. Conclusions: Sandblasting produced a roughness increase on GC surfaces but not in LAVA ones. (Grants number - CAPES# O565-07-5-...

Research paper thumbnail of Control and reduction of peak temperature in self-curing resins

ORAL & implantology, 2009

INTRODUCTION.: The aim of this experimental study was to reduce the exothermic reaction during cu... more INTRODUCTION.: The aim of this experimental study was to reduce the exothermic reaction during curing of the resins to cold. The significant exotherm generated by the reaction of polymerization of the resin curing involves many clinical complications including the high risk of necrosis against tooth. MATERIAL AND METHODS.: They were used four different types of self curing resins all based on methyl methacrylate, Jet Kit, Major Dentin, Dura Lay, Temporary Cold. The reaction of polymerization of the resins was done in Teflon pans and was monitored by a thermocouple which recorded the highest level reached by each temperature resin with and without additive. The polymerization reaction took place for each resin in the presence of an essential oil, the terpinolene, which acted as a "chain transfer" and different temperatures were recorded. RESULTS.: Resins Dura Lay and Jet kit showed a reduction of very high temperature in the presence of terpinolene, with a statistically sig...

Research paper thumbnail of Microtensile bond strength evaluation of self-adhesive resin cement to zirconia ceramic after different pre-treatments

American journal of dentistry, 2012

To evaluate the influence of different surface treatments and metal primer application on bond st... more To evaluate the influence of different surface treatments and metal primer application on bond strength of zirconia ceramic to a self-adhesive resin cement. 40 cylinder-shaped (Ø 12 x 5.25 mm high) of zirconia ceramic (Aadva Zirconia) were randomly divided into four groups (n= 10), based on the surface treatment to be performed: (1) Sandblasting with 125 microm Al2O3 particles (S) (positive control); (2) Selective infiltration etching (SIE); (3) Experimental heated etching solution applied for 30 minutes (ST); (4) No treatment (C). Half of the zirconia specimens of each group received the application of Metal Primer II. Eight disks for each group were luted using a self-adhesive resin cement (G-Cem Automix) to composite overlays (Paradigm MZ100). After 24-hour storage (37 degrees C, 100% RH) bonded specimens were cut into microtensile sticks and loaded in tension until failure. Data were analyzed with two-way ANOVA and Games-Howell (P < 0.05). Failure mode distribution was record...

Research paper thumbnail of Influence of different surface treatments on surface zirconia frameworks

Journal of Dentistry, 2009

To evaluate the effect of different chemo-mechanical surface treatments of zirconia ceramic in th... more To evaluate the effect of different chemo-mechanical surface treatments of zirconia ceramic in the attempt to improve its bonding potential. Sintered zirconium oxide ceramic discs (Lava Ø10mm x 1mm height) were treated with (n=4): (1) airborne particle abrasion with 125microm Al(2)O(3) particles; (2) 9.5% HF acid etching; (3) selective infiltration etching (SIE); (4) experimental hot etching solution applied for 10, 30 and 60min; (5) no treatment. Ceramic discs surfaces were analyzed by atomic force microscopy (AFM) recording average surface roughness measurements of the substrate. Data were statistically analyzed by Kruskall-Wallis analysis of variance and Mann-Whitney tests (alpha=0.05). The same discs were used for bi-dimensional zirconia ceramic surface characterization with scanning electron microscope (SEM). Ceramic surface treatments significantly influenced surface topography and roughness (p&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.001). Bi-dimensional changes in ceramic surface morphology were assessed on a nanometric scale. The experimental hot etching solution improved surface roughness, independently from the application time. Zirconia conditioning with the experimental hot etching solution may enhance ceramic roughness and improve the surface area available for adhesion allowing the formation of micromechanical retention. The influence of this surface treatment with regard to bond strength of zirconia needs to be addressed.

Research paper thumbnail of Effect of simulated pulpal pressure on self-adhesive cements bonding to dentin

Dental Materials, 2008

Objectives. To evaluate the bonding effectiveness of self-adhesive luting cements to dentin in th... more Objectives. To evaluate the bonding effectiveness of self-adhesive luting cements to dentin in the presence of simulated hydrostatic intrapulpal pressure (PP). Methods. Thirty composite overlays (Aelite All Purpose Body) were luted to deep-coronal dentin surfaces using four self-adhesive resin cements (Rely X Unicem, G-Cem, Multilink Sprint, Bis-Cem) and one total-etch system (Calibra). Half of the specimens resin cements were applied under a PP of 15 cm H 2 O. After storage in a moist condition for 1 month (37 • C, 100% relative humidity), specimens were sectioned into microtensile beams (1 mm 2) and stressed to failure with the microtensile bond strength test (TBS). Data were statistically analyzed with Kruskal-Wallis ranking (p < 0.05) and Mann-Whitney tests (p < 0.001). The fracture pattern was evaluated under SEM. Results. Bond strength of Calibra fell significantly when PP was applied during bonding (p < 0.05). Rely X Unicem and Bis-Cem performed better under PP. No significant differences for Multilink Sprint and G-Cem bonded specimens were recorded with or without PP. Significance. Simulated PP influences the adhesive performance of resinous cements. The predominance of acid-base reactions or radical polymerization may explain the different behavior of self-adhesive cements when changing substrate wetness. The application of constant intrapulpal perfusion should be considered when simulating luting procedures in vitro.

Research paper thumbnail of Accuracy of Four Intra-Oral Scanners in Subgingival Vertical Preparation: An In Vitro 3-Dimensional Comparative Analysis

Materials

One of the most critical aspects in intraoral impression is the detection of the finish line, par... more One of the most critical aspects in intraoral impression is the detection of the finish line, particularly in the case of subgingival preparations. The aim of this in vitro study was to evaluate the accuracy among four different Intra Oral Scanners (IOSs) in scanning a subgingival vertical margins preparation (VP). A reference maxillary typodont (MT) was fabricated with a VP for full crown on #16 and #21. The MT was scanned with a laboratory scanner (Aadva lab scanner, GC, Tokyo, Japan) to obtain a digital MT (dMT) in .stl format file. A group of 40 digital casts (dIOC) were obtained by scanning the MT 10 times with four different IOSs: Trios 3, 3Shape A/S; I700, Medit; Vivascan, Ivoclar; and Experimental IOS, GC. All the obtained dIOCs were imported into an inspection software program (Geomagic Control X; 3D SYSTEMS) to be superimposed to the dMT in order to calculate trueness. Therefore, in order to calculate precision, all the scans of the same scanner group were superimposed ont...

Research paper thumbnail of Accuracy, time efficiency and operator preference in edentulous arch scanning: a preliminary report: a preliminary report

Journal of Osseointegration, Sep 29, 2021

Aim The present in vitro study evaluated the accuracy of intraoral scanners (IOS) in a completely... more Aim The present in vitro study evaluated the accuracy of intraoral scanners (IOS) in a completely edentulous arches and analyzed the influence of operator experience on accuracy, also time efficiency and operator's difficulty perception related to IOS procedures. Materials and methods Twenty participants were enrolled for the digital scanning procedure of a maxillary edentulous metal model using an intraoral scanner, Aadva iOS100 (GC Corp., Tokyo, Japan). Participants were divided in two groups according to their experience in intraoral scanning procedures: Inexpert (InE group) without any experience in dental scanning (n=10) and Experts (E group) composed of operators with at least 3 year of scanning experience with IOS (n=5). Five IOS procedures were repeated for each operator and exported as a correspondent Stereolithography (STL) file. The same model was scanned with a laboratory scanner (LSS) (D1000 3 Shape Copenaghen Denmark), obtaining an STL file of the model which has been used as a reference. Accuracy of IOS were evaluated using a surface adaptation software (Geomagic Design X). The time required for each scanning procedure, and the perceived difficulty level were recorded for all the participants. The data obtained about accuracy, scanning time and difficulty perceived were compared between the two groups using the T-test for independent samples. The same variables were also correlated with each other using the Pearson's coefficient. Results The highest trueness was observed for the scans provided by E participants. Precision ranged from 95,89 to 79,36 respectively in E and InE operators. For both trueness and precision there were significant differences between the two groups (p<0.05). Regarding scanning time, the more experienced operators were faster than inexpert ones with a significant difference (p<0.001). The two groups reported also differences in terms of difficulty perceived. Pearson's correlation reported for time scanning a significant correlation with trueness p<0.001 and precision p<0.05 and between difficulty perceived and trueness p<0.05. Conclusions Digital impressions accuracy was different in E and InE operators as well as the scanning times, that was correlated with both trueness and precision.

Research paper thumbnail of Influence of different surface treatments on surface zirconia frameworks

Journal of Dentistry, Nov 1, 2009

ObjectivesTo evaluate the effect of different chemo-mechanical surface treatments of zirconia cer... more ObjectivesTo evaluate the effect of different chemo-mechanical surface treatments of zirconia ceramic in the attempt to improve its bonding potential.

Research paper thumbnail of Digital Impressions in Edentulous Patients: A Systematic Review for Clinical Evidence

The International Journal of Prosthodontics

Research paper thumbnail of One-Year Multicenter Randomised Controlled Trial Comparing OT Equator® and Locator Attachments to Retain an Early Loaded Implant Overdenture on Two Implants

International Journal of Biomaterials

This investigation aimed to compare the effectiveness of the OT Equator® (Rhein, Bologna, Italy) ... more This investigation aimed to compare the effectiveness of the OT Equator® (Rhein, Bologna, Italy) and the Locator attachment systems used to retain early loaded implant-retained overdentures. This study was designed as a multicenter randomised controlled trial of parallel groups. After implant placement, the patients were randomised to receive OT Equator® attachments in the test group or Locator attachments in the control group. The outcome measures were implant and prosthetic success and survival rates, any biological and technical complication, marginal bone loss, patients’ satisfaction, and periodontal parameters. Overall, 42 patients were consecutively enrolled and treated. One implant was lost in the control group, while no implants were lost in the test group. No prostheses failed in both groups. Only a few complications were experienced in both groups. The main was represented by loss of retention of the attachments (retentive caps). The OT Equator® attachment showed statistic...

Research paper thumbnail of Accuracy, time efficiency and operator preference in edentulous arch scanning: a preliminary report

Journal of Osseointegration, 2021

Aim The present in vitro study evaluated the accuracy of intraoral scanners (IOS) in a completely... more Aim The present in vitro study evaluated the accuracy of intraoral scanners (IOS) in a completely edentulous arches and analyzed the influence of operator experience on accuracy, also time efficiency and operator’s difficulty perception related to IOS procedures. Materials and methods Twenty participants were enrolled for the digital scanning procedure of a maxillary edentulous metal model using an intraoral scanner, Aadva iOS100 (GC Corp., Tokyo, Japan). Participants were divided in two groups according to their experience in intraoral scanning procedures: Inexpert (InE group) without any experience in dental scanning (n=10) and Experts (E group) composed of operators with at least 3 year of scanning experience with IOS (n=5). Five IOS procedures were repeated for each operator and exported as a correspondent Stereolithography (STL) file. The same model was scanned with a laboratory scanner (LSS) (D1000 3 Shape Copenaghen Denmark), obtaining an STL file of the model which has been ...

Research paper thumbnail of Flexural Strength Analysis of Different Complete Denture Resin-Based Materials Obtained by Conventional and Digital Manufacturing

Materials

PMMA (Polymethylmethacrylate) is the material of choice to fabricate denture bases. Recently, wit... more PMMA (Polymethylmethacrylate) is the material of choice to fabricate denture bases. Recently, with the introduction of CAD-CAM and 3D printers in dentistry, new materials have been proposed for complete denture manufacturing. Aim: This study compared the flexural strength of different resins fabricated using different technologies (conventional, CAD-CAM-milled, and 3D-printed) and polymerization techniques. Methods: A total of 11 different resins were tested: six PMMA conventional (Acrypol R, Acrypol LL, Acrypol HI, Acrypol Fast, Acryself and Acryslef P), two milled obtained from UDMA PMMA disks (Ivotion disk and Aadva disk, control groups), two 3D-printed PMMA resins (NextDent Denture 3D+, and SprintRayEU Denture Base), and one 3D-printed composite resin (GC Temp Print). Flexural strength was measured using a universal testing machine. One-way ANOVA and Bonferroni post hoc tests were performed; the p-value was set at 0.05 to consider statistically significant differences among the ...

Research paper thumbnail of Digital workflow in complete dentures: a narrative review

Journal of Osseointegration, 2020

Aim The aim of the present study is to review the literature evaluating the main steps required i... more Aim The aim of the present study is to review the literature evaluating the main steps required in complete denture rehabilitation in case of edentulous jaws in the digital workflow. Methods This review was conducted using PubMed and Scopus databases. It focuses on the following clinical and laboratory steps: the impression, the registration of the centric relation, the try-in and the finalization. Results According to the reported data in literature, impression, try-in and finalization are feasible with a complete digital approach. Registration of the centric is possible only combining the digital with the traditional one. Digital impression is accurate, but shows some limitations in the peripheral areas. The printing process, because of accuracy and its cost, can be used for the try-in of the prototype. Milling machine is more accurate than 3D printing and offers a good level of retention and of satisfaction for the patient. Conclusions In relation to optical scanning, there are...

Research paper thumbnail of Study

Phonetic analysis and maxillary anterior tooth position: a pilot

Research paper thumbnail of Feasibility of Low Profile Attachments to Improve Quality of Life on Patients with Implant-Retained Mandibular Overdenture: 1-Year Preliminary Results of a Multicenter Prospective Case Series Study

Aim: The purpose of this multicenter prospective case series study evaluated peri-implant margina... more Aim: The purpose of this multicenter prospective case series study evaluated peri-implant marginal bone loss, complications, oral health impact profile, and soft tissue parameters in patients with mandible implant overdenture retained on two low profile attachments. Methods: This study was designed as a multicenter prospective case series study conducted according to the Declaration of Helsinki of 1975, as revised in 2008. Patients that required an implant-retained overdenture to rehabilitate a complete edentulous mandible were considered eligible for this research. Patients were consecutively enrolled and treated in seven centers in Italy between February 2012 and March 2017. The last follow-up was in May 2018. Results: A total of 40 mandibular implantretained overdentures were delivered on 40 participants (26 females and 14 males) with a mean age of 67.5 years. All the participants were followed for at least one year (mean 21.3 months, range 12 to 60) after implant loading. At the...

Research paper thumbnail of OT-Equator® Attachments Comparison for Retaining an Early Loaded Implant Overdenture on Two or Three Implants: 1 Year RCT Preliminary Data

Applied Sciences, 2021

The purpose of this multicenter randomized controlled trial was to compare the clinical, radiogra... more The purpose of this multicenter randomized controlled trial was to compare the clinical, radiographic, and patient-centered outcomes of early loaded mandibular overdentures deliberately placed on two or three implants. The outcomes were: implant and prosthesis success and survival rates; biological and technical complications; marginal bone loss; patient satisfaction; and periodontal parameters. The results showed no differences between the groups in any of the outcomes analyzed. With the limitations of the present study, and looking at long-term follow-up, the gold standard of prosthetic rehabilitations with attachments, in agreement with the scientific community, should prefer two non-splinted implants.

Research paper thumbnail of Multicenter retrospective analysis on survival rate, complications, patient satisfaction and biological parameters of implant overdentures delivered with different design and attachment systems- results between 1 and 17 years of follow-up

Clinical Oral Implants Research, Oct 1, 2018

Research paper thumbnail of Multicenter Retrospective Analysis of Implant Overdentures Delivered with Different Design and Attachment Systems: Results Between One and 17 Years of Follow-Up

Dentistry Journal, 2018

Purpose: To analyze implant and prosthetic survival rates, complications, patient satisfaction, a... more Purpose: To analyze implant and prosthetic survival rates, complications, patient satisfaction, and biological parameters of patients rehabilitated with implant overdentures (IOV) on splinted and nonsplinted implants and different attachment systems, in function for one to 17 years. Methods: This retrospective study evaluated data collected from patients rehabilitated with implant overdentures between January 2001 and December 2016 in nine different centers. Outcome measures were implant and prosthetic success rates, mechanical complications, marginal bone loss (MBL), oral health impact profile (OHIP), bleeding on probing, and plaque index. Results: A total of 581 implants were installed in 194 patients. Patients were followed for a mean period of 60.6 months (range 6–206). Eighty-nine patients received 296 low profile attachment (OT Equator), 62 patients received 124 ball attachments, and 43 patients received 107 Locator attachments. In eighty-three patients the implants were splin...

Research paper thumbnail of Surface treatment effects on three zirconium-oxide ceramics

Objectives: To estimate the effects of chemo/mechanical treatments on the surface of three differ... more Objectives: To estimate the effects of chemo/mechanical treatments on the surface of three differently marketed zirconia ceramics using scanning electron and atomic force microscopy evaluations. Materials and Methods: Cylinder-shaped disks ( 10x1 mm height) were obtained from three sintered zirconium oxide ceramics (Lava, Cercon and experimental GC). Blocks were conditioned with (n=3): 1) Airbone particle abrasion with 125 m Al2O3 particles; 2) Selective infiltration etching (SIE); 3) Experimental hot etching solution applied for 30 min (ST); 4) No treatment. The average surface roughness after each conditioning protocol was assessed using an Atomic Force Microscopy (AFM) and evaluated by a single operator. Data were statistically analyzed with the Two-way ANOVA and the Games-Howell tests (p<0.05). The same discs were observed under a Scanning Electron Microscope (SEM) for a bi-dimensional zirconia surface ceramic characterization. Results: The factor surface treatment significan...

Research paper thumbnail of Self-adhesive resin cement bonding to zirconia ceramic after different pre-treatments

Objectives: To evaluate the influence of different surface treatments and metal primer applicatio... more Objectives: To evaluate the influence of different surface treatments and metal primer application on bond strength of zirconia ceramic to a self-adhesive resin cement. Methods: : Forty cylinder-shaped (Ø 12 X 5.25 mm high) of zirconia ceramic (Aadva Zirconia, GC) were randomly divided into 4 groups (n=10), based on the surface treatment to be performed: 1. Sandblasting with 125 µm Al2O3 particles (S); 2. Selective infiltration etching (SIE); 3. Experimental hot etching solution applied for 30 min (ST); 4. No treatment (C). Half of the zirconia specimens of each group received the application of Metal Primer II. An amount of eight disks for each group were luted used using a self-adhesive resin cement (G-Cem Automix, GC) to composite overlays (Paradigm MZ100, 3M ESPE). After 24 h bonded specimens were cut into microtensile sticks and loaded in tension until failure. Data were analysed with two-way ANOVA and Games-Howell (p<0.05). Failure mode distribution was recorded and scannin...

Research paper thumbnail of Influence of sandblasting on surface roughness of two zirconia ceramics

Bond strength between ceramic materials and luting cements may be improved if ceramic surface rou... more Bond strength between ceramic materials and luting cements may be improved if ceramic surface roughness is increased. Objective: The aim of this study was to compare the influence of sandblasting treatment on surface roughness of one zirconia ceramics: LAVA (3M ESPE) and one experimental zirconia ceramic GC (GC, Corp.). Methods: Ceramic surfaces were treated as follows: Sandblasting with 125 mm aluminum-oxide (Al2O3) particles; 2) no treatment. Digital images (100x100 microns) from the surfaces were obtained by means of an AFM microscope in taping mode (Nanoscope IIIa- Digital Instruments). Roughness was measured in 20x20 microns boxes. Roughness (Ra) data (nm) were analyzed by One-way Anova and Student t test (p<0.05). Results: Mean roughness (Ra-nm) and standard deviations are presented in the table. Different letters indicates significant differences. Conclusions: Sandblasting produced a roughness increase on GC surfaces but not in LAVA ones. (Grants number - CAPES# O565-07-5-...

Research paper thumbnail of Control and reduction of peak temperature in self-curing resins

ORAL & implantology, 2009

INTRODUCTION.: The aim of this experimental study was to reduce the exothermic reaction during cu... more INTRODUCTION.: The aim of this experimental study was to reduce the exothermic reaction during curing of the resins to cold. The significant exotherm generated by the reaction of polymerization of the resin curing involves many clinical complications including the high risk of necrosis against tooth. MATERIAL AND METHODS.: They were used four different types of self curing resins all based on methyl methacrylate, Jet Kit, Major Dentin, Dura Lay, Temporary Cold. The reaction of polymerization of the resins was done in Teflon pans and was monitored by a thermocouple which recorded the highest level reached by each temperature resin with and without additive. The polymerization reaction took place for each resin in the presence of an essential oil, the terpinolene, which acted as a "chain transfer" and different temperatures were recorded. RESULTS.: Resins Dura Lay and Jet kit showed a reduction of very high temperature in the presence of terpinolene, with a statistically sig...

Research paper thumbnail of Microtensile bond strength evaluation of self-adhesive resin cement to zirconia ceramic after different pre-treatments

American journal of dentistry, 2012

To evaluate the influence of different surface treatments and metal primer application on bond st... more To evaluate the influence of different surface treatments and metal primer application on bond strength of zirconia ceramic to a self-adhesive resin cement. 40 cylinder-shaped (Ø 12 x 5.25 mm high) of zirconia ceramic (Aadva Zirconia) were randomly divided into four groups (n= 10), based on the surface treatment to be performed: (1) Sandblasting with 125 microm Al2O3 particles (S) (positive control); (2) Selective infiltration etching (SIE); (3) Experimental heated etching solution applied for 30 minutes (ST); (4) No treatment (C). Half of the zirconia specimens of each group received the application of Metal Primer II. Eight disks for each group were luted using a self-adhesive resin cement (G-Cem Automix) to composite overlays (Paradigm MZ100). After 24-hour storage (37 degrees C, 100% RH) bonded specimens were cut into microtensile sticks and loaded in tension until failure. Data were analyzed with two-way ANOVA and Games-Howell (P < 0.05). Failure mode distribution was record...

Research paper thumbnail of Influence of different surface treatments on surface zirconia frameworks

Journal of Dentistry, 2009

To evaluate the effect of different chemo-mechanical surface treatments of zirconia ceramic in th... more To evaluate the effect of different chemo-mechanical surface treatments of zirconia ceramic in the attempt to improve its bonding potential. Sintered zirconium oxide ceramic discs (Lava Ø10mm x 1mm height) were treated with (n=4): (1) airborne particle abrasion with 125microm Al(2)O(3) particles; (2) 9.5% HF acid etching; (3) selective infiltration etching (SIE); (4) experimental hot etching solution applied for 10, 30 and 60min; (5) no treatment. Ceramic discs surfaces were analyzed by atomic force microscopy (AFM) recording average surface roughness measurements of the substrate. Data were statistically analyzed by Kruskall-Wallis analysis of variance and Mann-Whitney tests (alpha=0.05). The same discs were used for bi-dimensional zirconia ceramic surface characterization with scanning electron microscope (SEM). Ceramic surface treatments significantly influenced surface topography and roughness (p&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.001). Bi-dimensional changes in ceramic surface morphology were assessed on a nanometric scale. The experimental hot etching solution improved surface roughness, independently from the application time. Zirconia conditioning with the experimental hot etching solution may enhance ceramic roughness and improve the surface area available for adhesion allowing the formation of micromechanical retention. The influence of this surface treatment with regard to bond strength of zirconia needs to be addressed.

Research paper thumbnail of Effect of simulated pulpal pressure on self-adhesive cements bonding to dentin

Dental Materials, 2008

Objectives. To evaluate the bonding effectiveness of self-adhesive luting cements to dentin in th... more Objectives. To evaluate the bonding effectiveness of self-adhesive luting cements to dentin in the presence of simulated hydrostatic intrapulpal pressure (PP). Methods. Thirty composite overlays (Aelite All Purpose Body) were luted to deep-coronal dentin surfaces using four self-adhesive resin cements (Rely X Unicem, G-Cem, Multilink Sprint, Bis-Cem) and one total-etch system (Calibra). Half of the specimens resin cements were applied under a PP of 15 cm H 2 O. After storage in a moist condition for 1 month (37 • C, 100% relative humidity), specimens were sectioned into microtensile beams (1 mm 2) and stressed to failure with the microtensile bond strength test (TBS). Data were statistically analyzed with Kruskal-Wallis ranking (p < 0.05) and Mann-Whitney tests (p < 0.001). The fracture pattern was evaluated under SEM. Results. Bond strength of Calibra fell significantly when PP was applied during bonding (p < 0.05). Rely X Unicem and Bis-Cem performed better under PP. No significant differences for Multilink Sprint and G-Cem bonded specimens were recorded with or without PP. Significance. Simulated PP influences the adhesive performance of resinous cements. The predominance of acid-base reactions or radical polymerization may explain the different behavior of self-adhesive cements when changing substrate wetness. The application of constant intrapulpal perfusion should be considered when simulating luting procedures in vitro.