Joseph Nissan | Tel Aviv University (original) (raw)

Papers by Joseph Nissan

Research paper thumbnail of Process for the Polymerization of Vinyl Pyridine

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Research paper thumbnail of The Use of Cancellous Block Allografts for Reconstruction and Following Implant Failure Associated with Severe Bone Loss: A Prospective Survival and Histomorphometric Study

International Journal of Periodontics & Restorative Dentistry, Jan 21, 2023

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Research paper thumbnail of International Journal of Molecular Sciences Article The Retentive Strength of Cemented Zirconium Oxide Crowns after Dentin Pretreatment with Desensitizing Paste Containing 8 % Arginine and Calcium Carbonate

Abstract: The effect of dentin pretreatment with Desensitizing Paste containing 8 % arginine and ... more Abstract: The effect of dentin pretreatment with Desensitizing Paste containing 8 % arginine and calcium carbonate on the retention of zirconium oxide (Y-TZP) crowns was tested. Forty molar teeth were mounted and prepared using a standardized protocol. Y-TZP crowns were produced using computer-aided design and computer-aided manufacturing (CAD-CAM) technology. The 40 prepared teeth were either pretreated with Desensitizing Paste or not pretreated. After two weeks, each group was subdivided into two groups, cemented with either Resin Modified Glass Ionomer Cement (RMGIC) or Self Adhesive Resin Cement (SARC)). Prior to cementation, the surface areas of the prepared teeth were measured. After aging, the cemented crown-tooth assemblies were tested for retentive strength using a universal testing machine. The debonded surfaces of the teeth and crowns were examined microscopically at 10 ˆ magnification. Pretreating the dentin surfaces with Desensitizing Paste prior to cementation did not ...

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Research paper thumbnail of Etiology and Classification of Endodontic-Periodontal Lesions

Endodontic-Periodontal Lesions, 2019

The periodontium and the dental pulp are closely associated, sharing embryonic, functional, and a... more The periodontium and the dental pulp are closely associated, sharing embryonic, functional, and anatomical interrelationships. Consequently, the relationship of endodontic and periodontal lesions has stirred confusion and debate as dental practitioners have become gradually further aware of the possible associations between the periodontium and the dental pulp.

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Research paper thumbnail of El efecto del aumento de la dimensión vertical oclusal sobre la altura facial

Objetivo: En este estudio hemos valorado el efecto del aumento de la dimension vertical oclusal (... more Objetivo: En este estudio hemos valorado el efecto del aumento de la dimension vertical oclusal (DVO) sobre la altura facial en adultos jovenes que conservaban su denticion completa. Material y metodos: Se obtuvieron fotografias sucesivas en las posiciones de intercuspidacion y de reposo clinico, con cuatro cubiertas oclusales de la arcada superior completa con un aumento gradual de la DVO en incrementos interincisales de 2, 4, 6 y 8 mm. A partir de las fotografias se realizaron mediciones objetivas utilizando unos marcadores faciales de referencia. Diez observadores valoraron subjetivamente los cambios resultantes en la altura facial utilizando las fotografias secuenciales que les fueron presentadas al azar. Resultados: Las mediciones de los marcadores faciales demostraron que al aumentar la DVO se producia un cambio correspondiente en la altura de la parte inferior de la cara equivalente al 50% del aumento interincisal en la posicion de intercuspidacion, y el 40% en la posicion de...

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Research paper thumbnail of PRF-Solution in Large Sinus Membrane Perforation with Simultaneous Implant Placement-Micro CT and Histological Analysis

Membranes, 2021

Background: The purpose of the study was to analyze the efficacy of platelet-rich fibrin (PRF) as... more Background: The purpose of the study was to analyze the efficacy of platelet-rich fibrin (PRF) as a single augmentation material for complicated cases of maxillary sinus floor elevation, resulting from membrane perforation or previous infections. Methods: Implant insertion in the posterior region of the maxilla was simultaneously performed with maxillary sinus floor augmentation. Schneiderian membrane elevation can be accompanied by extremely serious sinus membrane perforation, due to accidental tearing or intended incision for mucocele removal. PRFs were placed in the sinus cavity both for membrane sealing and sinus floor grafting. Radiological, histological and micro-CT analyses were performed. Implant survival was assessed every 6 months for 1 to 4 years, with a mean follow up of 1.8 years, after prosthetic loading. Radiological examinations were performed on CBCT at 9 and 12 and 36 months postoperatively and revealed improved degrees of radiopacity. Results: 19 implants were sim...

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Research paper thumbnail of The efficacy of bone scraper for bone window osteotomy in the course of sinus augmentation

STOMATOLOGY EDU JOURNAL, 2018

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Research paper thumbnail of Four-year cross-sectional study of bleeding risk in dental patients on direct oral anticoagulants

Quintessence international (Berlin, Germany : 1985), 2017

New oral anticoagulants, or "direct oral anticoagulants" (DOACs), have been used worldw... more New oral anticoagulants, or "direct oral anticoagulants" (DOACs), have been used worldwide in recent years. An evidence-based enigma regarding dental patients using DOACs still exists. This was a 4-year, cross-sectional study on individuals receiving DOAC therapy, treated in a single maxillofacial center. A bleeding event was the outcome parameter. Potential contributing risk factors were evaluated. Of a total of 111 patients, 72 underwent a total of 305 oral procedures in 115 sessions. The overall frequency of bleeding events was 6.1% per session. One "major" (0.9%) and six "minor" (5.2%) events were recorded. The management was simple, local hemostasis. Statistically significant association was found between bleeding events and (1) history of spontaneous hemorrhage and (2) surgical procedures involving soft tissue manipulation. Withdrawal of DOAC therapy was not associated with decreased postoperative bleeding events. The risk of bleeding in dental pa...

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Research paper thumbnail of Histomorphometrical Assessment of Sinus Augmentation Using Allograft (Particles or Block) and Simultaneous Implant Placement

Scientific Reports, 2020

The aim of the present study was to compare the clinical, radiological and histomorphometrical ou... more The aim of the present study was to compare the clinical, radiological and histomorphometrical outcome of simultaneous implant placement following augmentation of atrophic maxillary sinuses using allograft (block or particles). Consecutive patients with maxillary residual alveolar ridge height ≤3 mm, scheduled for sinus floor augmentation with simultaneous implant placement, were randomly included. Allograft bone-block or bone-particles served as grafting material. Simultaneously, dental implants were inserted. Biopsies were taken at second stage surgery (after 9 months) for histomorphometric evaluation. Initially 38 sinus augmentations (29 individuals) were allocated for the study. In 4 out of 21(19%) sinuses using particles it was impossible to stabilize the implants and a second stage insertion was preferred, leaving 34 sinuses for histomorphometric evaluation. The difference in the ability to perform simultaneous implant placement was statistically significant (p < 0.05). Nin...

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Research paper thumbnail of Primary Teeth Supported Fixed Prosthesis—A Predictable Treatment Alternative

Children

Background: Individuals with tooth agenesis often present a significant clinical challenge for de... more Background: Individuals with tooth agenesis often present a significant clinical challenge for dental practitioners. This retrospective study evaluated clinical and radiological long-term functional and esthetic outcomes following restoration using primary teeth to support fixed all-ceramic prosthesis in patients with teeth agenesis. Methods: Patients with teeth agenesis and at least one year follow-up were included. Examinations included panoramic X-ray, clinical examination and family history records. Only primary teeth without permanent teeth underneath were chosen. All ceramic fixed restorations were used. All data were collected from patient files. Outcome parameters included: restoration parameters (restoration survival, restoration fractures, restoration detachment, restoration replacement, and secondary caries), plaque index, and gingival index. Results: The study included 58 porcelain restorations inserted in 25 individuals; mean age 12 ± 2.1 years (range 10–19 years); mean...

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Research paper thumbnail of Is There an Age Limit for Implant Dentistry?

STOMATOLOGY EDU JOURNAL, 2020

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Research paper thumbnail of Immediate nonfunctional loading of single-tooth implants in the anterior maxilla following augmentation with freeze-dried cancellous block allograft: a case series

International Journal of Oral & Maxillofacial Implants

To assess the clinical effectiveness of immediate nonfunctional loading for single-tooth implants... more To assess the clinical effectiveness of immediate nonfunctional loading for single-tooth implants placed in the anterior maxilla following augmentation with cancellous freeze-dried block graft. The clinical outcomes of immediately nonfunctionally loaded implants up to 18 months after placement in the anterior maxilla were evaluated in 11 consecutive patients. Implants were immediately restored with unsplinted acrylic resin provisional crowns. Follow-up was monthly, and intraoral radiographs were obtained immediately after implant placement and at 6, 12, and 18 months. Survival rate and radiographic marginal bone loss were evaluated at 0, 6, 12, and 18 months. In the anterior maxilla, 12 implants were placed. Marginal bone loss did not extend beyond the first thread up to 18 months follow-up, and the survival rate was 100%. Within the limits of the present study, immediate nonfunctional loading for single-tooth implants placed in the anterior maxilla following augmentation with cance...

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Research paper thumbnail of Long-term outcome of cemented versus screw-retained implant-supported partial restorations

International Journal of Oral & Maxillofacial Implants

The present study was designed to compare the long-term outcome and complications of cemented ver... more The present study was designed to compare the long-term outcome and complications of cemented versus screw-retained implant restorations in partially edentulous patients. Consecutive patients with bilateral partial posterior edentulism comprised the study group. Implants were placed, and cemented or screw-retained restorations were randomly assigned to the patients in a split-mouth design. Follow-up (up to 15 years) examinations were performed every 6 months in the first year and every 12 months in subsequent years. The following parameters were evaluated and recorded at each recall appointment: ceramic fracture, abutment screw loosening, metal frame fracture, Gingival Index, and marginal bone loss. Thirty-eight patients were treated with 221 implants to support partial prostheses. No implants during the follow-up period (mean follow-up, 66 ± 47 months for screw-retained restorations [range, 18 to 180 months] and 61 ± 40 months for cemented restorations [range, 18 to 159 months]). C...

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Research paper thumbnail of Factors Influencing Marginal Bone Loss around Dental Implants: A Narrative Review

Coatings

Implant supported dental prostheses are increasingly used in dental practice. The aim of this nar... more Implant supported dental prostheses are increasingly used in dental practice. The aim of this narrative review is to present the influence of transmucosal surface of prosthetic abutment and implant on peri-implant tissue. The article describes causes of bone loss around the dental implant. Moreover, properties of different materials are compared and discussed. The advantages, disadvantages, and biomechanical concept of different implant-abutment connections are presented. The location of connections in relation to the bone level and the influence of microgap between the abutment and implant are described. Additionally, the implant abutments for cemented and screwed prosthetic restorations are compared. The influence of implant and abutment surface at the transmucosal level on peri-implant soft tissue is discussed. Finally, the biological aspect of abutment-implant connection is analyzed.

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Research paper thumbnail of Effect of Surface Cleaning Regimen on Glass Ceramic Bond Strength

Molecules

This study investigated the effect of saliva contamination on chemical changes of ceramic surface... more This study investigated the effect of saliva contamination on chemical changes of ceramic surface as well as the influence of saliva cleaning methods on ceramic-resin bond strength. Saliva was used to contaminate leucite (LGC) and lithium disilicate (LDGC) glass ceramic surfaces. The following cleaning methods were tested: water spray, cleaning with orthophosphoric acid, universal cleaning paste, ultrasonic cleaning with water, re-etching with hydrofluoric acid. Non-contaminated ceramic sample served as control. Chemical analysis of ceramic surfaces was performed using time-of-flight secondary ion mass spectrometry (TOF-SIMS). Shear bond strength (SBS) of ceramics to resin material was tested after 24-hour water storage and after thermocycling. The most effective cleaning method of saliva-contaminated ceramic surface was cleaning LGC surface with orthophosphoric acid or re-etching the LDGC surface with hydrofluoric acid. The application of the following methods resulted in obtaining...

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Research paper thumbnail of The Use of Tilted Implant for Posterior Atrophic Maxilla

Clinical implant dentistry and related research, Jan 8, 2015

To retrospectively analyze the influence of implant inclination on marginal bone loss at freestan... more To retrospectively analyze the influence of implant inclination on marginal bone loss at freestanding implant-supported fixed partial prostheses (FPPs) over a medium-term period of functional loading. Twenty-nine partially edentulous patients with freestanding FPDs supported by two implants placed in a two-stage procedure comprised the study group. The anterior implant was placed axially, and the posterior tilted distally. Mesial or distal inclination of each implant was measured in relation to the vertical axis perpendicular to the occlusal plane. Average bone loss was compared between straight and tilted implants, smokers, and nonsmokers. Mean angulation of the anterior axial-positioned implant was 3.45 degrees distally (range 0-8) and of the distal implants was 32.83 degrees distally (range 20-50 degrees). Average bone loss after 1, 3, and 5 years was 0.89 (SD = 0.73), 1.18 (SD = 0.74), and 1.50 (SD = 0.81), respectively, for axial implants, and 0.98 (SD = 0.69), 1.10 (SD = 0.60)...

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Research paper thumbnail of Accuracy of a laboratory-based computer implant guiding system

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2010

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Research paper thumbnail of Histomorphometric Analysis After Maxillary Sinus Floor Augmentation Using Cancellous Bone–Block Allograft

Journal of Periodontology, 2010

Cancellous bone-block allografts may contribute to improved initial implant stability during sinu... more Cancellous bone-block allografts may contribute to improved initial implant stability during sinus augmentation in cases with posterior atrophic maxillary ridge height &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; or =4 mm. The present study histologically and histomorphometrically evaluates the application of cancellous bone-block allografts for maxillary sinus-floor augmentation. Thirty-one consecutive patients, 16 females and 15 males (age range, 25 to 65 years; mean age: 54 +/- 9 years) underwent sinus augmentation with simultaneous implant placement with cancellous bone-block allografts. After 9 months, a second-stage surgery was performed. The previous window location was determined. A cylindrical sample core was collected. All specimens were prepared for histologic and histomorphometric examinations. Seventy-two of 76 implants were clinically osseointegrated (94.7%). All patients received a fixed implant-supported prosthesis. The mean t values of newly formed bone, residual cancellous bone-block allograft, marrow and connective tissue were 26.1% +/- 15% (range: 10% to 58%); 24.7% +/- 19.4% (range: 0.6% to 71%), and 49.2% +/- 20.4% (range: 14.9% to 78.9%), respectively. No statistically significant histomorphometric differences regarding newly formed bone were found between genders (27.02% in males versus 25.68% in females; P = 0.446), ages (29.82% in subjects &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; or =40 years old versus 24.43% in subjects &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;40 years old; P = 0.293), presence of membrane perforations (25.5% in non-perforated sinuses versus 27.3% in perforated sinuses; P = 0.427), and residual alveolar bone height (25.85% for residual alveolar bone height &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;2 mm versus 26.48% for residual alveolar bone height of 2 to 4 mm; P = 0.473). The cancellous bone-block allograft is biocompatible and osteoconductive and permits new bone formation in sinus augmentations with simultaneous implant-placement procedures in extremely atrophic posterior maxillae.

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Research paper thumbnail of Heat Transfer of Impression Plasters to an Implant-Bone Interface

Implant Dentistry, 2006

The purpose of this in vitro study was to measure heat generated at the implant-bone interface ca... more The purpose of this in vitro study was to measure heat generated at the implant-bone interface caused by exothermic setting reaction of 2 impression plasters. The study consisted of 20 titanium-alloy abutment impressions connected to a titanium-alloy cylindrical implant embedded in an acrylic-resin mandible in a 37 degrees C water bath. There were 2 types of impression plaster used, Snow-White (Kerr, Romulus, MI) and Xantano (Kulzer, Dormagen, Germany). Temperature changes were recorded via embedded thermocouples at the cervix and implant surface apex. Analysis of variance for repeated measures was used to compare 2 treatment groups. Temperature increased less at the implant apex (1.5 degrees-2.1 degrees C) than at the implant cervix (7.4 degrees-10.5 degrees C). Differences between the 2 impression plasters were statisticallysignificant only at the implant cervical level (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;lt; 0.05). A lower temperature increase was shown with the Snow-White compared with the Xantano. Although both plasters generated an exothermic reaction on setting (mean temperature change 22 degrees C), the increase in the temperature rate of the Snow-White was slower than the Xantano. Under the conditions of the present study, Snow-White impression plaster appears to be safer to use in implant prosthodontics compared with the Xantano because of its slower and lower exothermic reaction at the implant-bone interface. However, use of the material with the rapid setting time would require more care, such as limiting the volume of material used (e.g., by using a custom tray).

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Research paper thumbnail of Esthetic Assessment of Implants Placed into Fresh Extraction Sockets for Single-Tooth Replacements Using a Flapless Approach

Clinical Implant Dentistry and Related Research, Nov 2, 2016

To validate the concept of immediate implant placement and nonfunctional loading for use in the e... more To validate the concept of immediate implant placement and nonfunctional loading for use in the esthetically sensitive anterior maxilla, clinical trials should ideally include objective esthetic criteria. This study analyzed procedural results as graded by the pink esthetic score and white esthetic score (PES/WES). Thirty-nine suitable patients (mean follow-up 44.82 ± 28 months) were evaluated. Thirty-eight implants fulfilled stringent criteria for successful osseointegration: absence of peri-implant radiolucency, implant mobility, suppuration, and pain. The mean total PES/WES was 15.50 ± 2.67 (range: 10-20). The mean total PES of 7.92 ± 1.60 (range: 5-10) indicated favorable overall peri-implant soft-tissue conditions. Root convexity and texture (1.63 ± 0.54) and curvature of the facial mucosa (1.68 ± 0.47) and distal papilla (1.66 ± 0.48) had the highest mean values, whereas acceptable levels of facial tissue (1.53 ± 0.73) and mesial papilla (1.42 ± 0.64) were the most difficult to fully achieve. The mean mesial and distal bone loss at data collection was, was 1.19 ± 0.54 and 1.15 ± 0.51, respectively. Periodontal disease severity (advanced chronic and aggressive periodontitis) was significantly associated with a low total PES (p = .048). Objective PES/WES assessment validated immediate anterior maxillary single-tooth replacement and restoration as being a successful and esthetically predictable treatment modality in sites where the buccal bone had been preserved during the extraction at 1 year of follow-up.

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Research paper thumbnail of Process for the Polymerization of Vinyl Pyridine

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Research paper thumbnail of The Use of Cancellous Block Allografts for Reconstruction and Following Implant Failure Associated with Severe Bone Loss: A Prospective Survival and Histomorphometric Study

International Journal of Periodontics & Restorative Dentistry, Jan 21, 2023

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Research paper thumbnail of International Journal of Molecular Sciences Article The Retentive Strength of Cemented Zirconium Oxide Crowns after Dentin Pretreatment with Desensitizing Paste Containing 8 % Arginine and Calcium Carbonate

Abstract: The effect of dentin pretreatment with Desensitizing Paste containing 8 % arginine and ... more Abstract: The effect of dentin pretreatment with Desensitizing Paste containing 8 % arginine and calcium carbonate on the retention of zirconium oxide (Y-TZP) crowns was tested. Forty molar teeth were mounted and prepared using a standardized protocol. Y-TZP crowns were produced using computer-aided design and computer-aided manufacturing (CAD-CAM) technology. The 40 prepared teeth were either pretreated with Desensitizing Paste or not pretreated. After two weeks, each group was subdivided into two groups, cemented with either Resin Modified Glass Ionomer Cement (RMGIC) or Self Adhesive Resin Cement (SARC)). Prior to cementation, the surface areas of the prepared teeth were measured. After aging, the cemented crown-tooth assemblies were tested for retentive strength using a universal testing machine. The debonded surfaces of the teeth and crowns were examined microscopically at 10 ˆ magnification. Pretreating the dentin surfaces with Desensitizing Paste prior to cementation did not ...

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Research paper thumbnail of Etiology and Classification of Endodontic-Periodontal Lesions

Endodontic-Periodontal Lesions, 2019

The periodontium and the dental pulp are closely associated, sharing embryonic, functional, and a... more The periodontium and the dental pulp are closely associated, sharing embryonic, functional, and anatomical interrelationships. Consequently, the relationship of endodontic and periodontal lesions has stirred confusion and debate as dental practitioners have become gradually further aware of the possible associations between the periodontium and the dental pulp.

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Research paper thumbnail of El efecto del aumento de la dimensión vertical oclusal sobre la altura facial

Objetivo: En este estudio hemos valorado el efecto del aumento de la dimension vertical oclusal (... more Objetivo: En este estudio hemos valorado el efecto del aumento de la dimension vertical oclusal (DVO) sobre la altura facial en adultos jovenes que conservaban su denticion completa. Material y metodos: Se obtuvieron fotografias sucesivas en las posiciones de intercuspidacion y de reposo clinico, con cuatro cubiertas oclusales de la arcada superior completa con un aumento gradual de la DVO en incrementos interincisales de 2, 4, 6 y 8 mm. A partir de las fotografias se realizaron mediciones objetivas utilizando unos marcadores faciales de referencia. Diez observadores valoraron subjetivamente los cambios resultantes en la altura facial utilizando las fotografias secuenciales que les fueron presentadas al azar. Resultados: Las mediciones de los marcadores faciales demostraron que al aumentar la DVO se producia un cambio correspondiente en la altura de la parte inferior de la cara equivalente al 50% del aumento interincisal en la posicion de intercuspidacion, y el 40% en la posicion de...

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Research paper thumbnail of PRF-Solution in Large Sinus Membrane Perforation with Simultaneous Implant Placement-Micro CT and Histological Analysis

Membranes, 2021

Background: The purpose of the study was to analyze the efficacy of platelet-rich fibrin (PRF) as... more Background: The purpose of the study was to analyze the efficacy of platelet-rich fibrin (PRF) as a single augmentation material for complicated cases of maxillary sinus floor elevation, resulting from membrane perforation or previous infections. Methods: Implant insertion in the posterior region of the maxilla was simultaneously performed with maxillary sinus floor augmentation. Schneiderian membrane elevation can be accompanied by extremely serious sinus membrane perforation, due to accidental tearing or intended incision for mucocele removal. PRFs were placed in the sinus cavity both for membrane sealing and sinus floor grafting. Radiological, histological and micro-CT analyses were performed. Implant survival was assessed every 6 months for 1 to 4 years, with a mean follow up of 1.8 years, after prosthetic loading. Radiological examinations were performed on CBCT at 9 and 12 and 36 months postoperatively and revealed improved degrees of radiopacity. Results: 19 implants were sim...

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Research paper thumbnail of The efficacy of bone scraper for bone window osteotomy in the course of sinus augmentation

STOMATOLOGY EDU JOURNAL, 2018

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Research paper thumbnail of Four-year cross-sectional study of bleeding risk in dental patients on direct oral anticoagulants

Quintessence international (Berlin, Germany : 1985), 2017

New oral anticoagulants, or "direct oral anticoagulants" (DOACs), have been used worldw... more New oral anticoagulants, or "direct oral anticoagulants" (DOACs), have been used worldwide in recent years. An evidence-based enigma regarding dental patients using DOACs still exists. This was a 4-year, cross-sectional study on individuals receiving DOAC therapy, treated in a single maxillofacial center. A bleeding event was the outcome parameter. Potential contributing risk factors were evaluated. Of a total of 111 patients, 72 underwent a total of 305 oral procedures in 115 sessions. The overall frequency of bleeding events was 6.1% per session. One "major" (0.9%) and six "minor" (5.2%) events were recorded. The management was simple, local hemostasis. Statistically significant association was found between bleeding events and (1) history of spontaneous hemorrhage and (2) surgical procedures involving soft tissue manipulation. Withdrawal of DOAC therapy was not associated with decreased postoperative bleeding events. The risk of bleeding in dental pa...

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Research paper thumbnail of Histomorphometrical Assessment of Sinus Augmentation Using Allograft (Particles or Block) and Simultaneous Implant Placement

Scientific Reports, 2020

The aim of the present study was to compare the clinical, radiological and histomorphometrical ou... more The aim of the present study was to compare the clinical, radiological and histomorphometrical outcome of simultaneous implant placement following augmentation of atrophic maxillary sinuses using allograft (block or particles). Consecutive patients with maxillary residual alveolar ridge height ≤3 mm, scheduled for sinus floor augmentation with simultaneous implant placement, were randomly included. Allograft bone-block or bone-particles served as grafting material. Simultaneously, dental implants were inserted. Biopsies were taken at second stage surgery (after 9 months) for histomorphometric evaluation. Initially 38 sinus augmentations (29 individuals) were allocated for the study. In 4 out of 21(19%) sinuses using particles it was impossible to stabilize the implants and a second stage insertion was preferred, leaving 34 sinuses for histomorphometric evaluation. The difference in the ability to perform simultaneous implant placement was statistically significant (p < 0.05). Nin...

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Research paper thumbnail of Primary Teeth Supported Fixed Prosthesis—A Predictable Treatment Alternative

Children

Background: Individuals with tooth agenesis often present a significant clinical challenge for de... more Background: Individuals with tooth agenesis often present a significant clinical challenge for dental practitioners. This retrospective study evaluated clinical and radiological long-term functional and esthetic outcomes following restoration using primary teeth to support fixed all-ceramic prosthesis in patients with teeth agenesis. Methods: Patients with teeth agenesis and at least one year follow-up were included. Examinations included panoramic X-ray, clinical examination and family history records. Only primary teeth without permanent teeth underneath were chosen. All ceramic fixed restorations were used. All data were collected from patient files. Outcome parameters included: restoration parameters (restoration survival, restoration fractures, restoration detachment, restoration replacement, and secondary caries), plaque index, and gingival index. Results: The study included 58 porcelain restorations inserted in 25 individuals; mean age 12 ± 2.1 years (range 10–19 years); mean...

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Research paper thumbnail of Is There an Age Limit for Implant Dentistry?

STOMATOLOGY EDU JOURNAL, 2020

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Research paper thumbnail of Immediate nonfunctional loading of single-tooth implants in the anterior maxilla following augmentation with freeze-dried cancellous block allograft: a case series

International Journal of Oral & Maxillofacial Implants

To assess the clinical effectiveness of immediate nonfunctional loading for single-tooth implants... more To assess the clinical effectiveness of immediate nonfunctional loading for single-tooth implants placed in the anterior maxilla following augmentation with cancellous freeze-dried block graft. The clinical outcomes of immediately nonfunctionally loaded implants up to 18 months after placement in the anterior maxilla were evaluated in 11 consecutive patients. Implants were immediately restored with unsplinted acrylic resin provisional crowns. Follow-up was monthly, and intraoral radiographs were obtained immediately after implant placement and at 6, 12, and 18 months. Survival rate and radiographic marginal bone loss were evaluated at 0, 6, 12, and 18 months. In the anterior maxilla, 12 implants were placed. Marginal bone loss did not extend beyond the first thread up to 18 months follow-up, and the survival rate was 100%. Within the limits of the present study, immediate nonfunctional loading for single-tooth implants placed in the anterior maxilla following augmentation with cance...

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Research paper thumbnail of Long-term outcome of cemented versus screw-retained implant-supported partial restorations

International Journal of Oral & Maxillofacial Implants

The present study was designed to compare the long-term outcome and complications of cemented ver... more The present study was designed to compare the long-term outcome and complications of cemented versus screw-retained implant restorations in partially edentulous patients. Consecutive patients with bilateral partial posterior edentulism comprised the study group. Implants were placed, and cemented or screw-retained restorations were randomly assigned to the patients in a split-mouth design. Follow-up (up to 15 years) examinations were performed every 6 months in the first year and every 12 months in subsequent years. The following parameters were evaluated and recorded at each recall appointment: ceramic fracture, abutment screw loosening, metal frame fracture, Gingival Index, and marginal bone loss. Thirty-eight patients were treated with 221 implants to support partial prostheses. No implants during the follow-up period (mean follow-up, 66 ± 47 months for screw-retained restorations [range, 18 to 180 months] and 61 ± 40 months for cemented restorations [range, 18 to 159 months]). C...

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Research paper thumbnail of Factors Influencing Marginal Bone Loss around Dental Implants: A Narrative Review

Coatings

Implant supported dental prostheses are increasingly used in dental practice. The aim of this nar... more Implant supported dental prostheses are increasingly used in dental practice. The aim of this narrative review is to present the influence of transmucosal surface of prosthetic abutment and implant on peri-implant tissue. The article describes causes of bone loss around the dental implant. Moreover, properties of different materials are compared and discussed. The advantages, disadvantages, and biomechanical concept of different implant-abutment connections are presented. The location of connections in relation to the bone level and the influence of microgap between the abutment and implant are described. Additionally, the implant abutments for cemented and screwed prosthetic restorations are compared. The influence of implant and abutment surface at the transmucosal level on peri-implant soft tissue is discussed. Finally, the biological aspect of abutment-implant connection is analyzed.

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Research paper thumbnail of Effect of Surface Cleaning Regimen on Glass Ceramic Bond Strength

Molecules

This study investigated the effect of saliva contamination on chemical changes of ceramic surface... more This study investigated the effect of saliva contamination on chemical changes of ceramic surface as well as the influence of saliva cleaning methods on ceramic-resin bond strength. Saliva was used to contaminate leucite (LGC) and lithium disilicate (LDGC) glass ceramic surfaces. The following cleaning methods were tested: water spray, cleaning with orthophosphoric acid, universal cleaning paste, ultrasonic cleaning with water, re-etching with hydrofluoric acid. Non-contaminated ceramic sample served as control. Chemical analysis of ceramic surfaces was performed using time-of-flight secondary ion mass spectrometry (TOF-SIMS). Shear bond strength (SBS) of ceramics to resin material was tested after 24-hour water storage and after thermocycling. The most effective cleaning method of saliva-contaminated ceramic surface was cleaning LGC surface with orthophosphoric acid or re-etching the LDGC surface with hydrofluoric acid. The application of the following methods resulted in obtaining...

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Research paper thumbnail of The Use of Tilted Implant for Posterior Atrophic Maxilla

Clinical implant dentistry and related research, Jan 8, 2015

To retrospectively analyze the influence of implant inclination on marginal bone loss at freestan... more To retrospectively analyze the influence of implant inclination on marginal bone loss at freestanding implant-supported fixed partial prostheses (FPPs) over a medium-term period of functional loading. Twenty-nine partially edentulous patients with freestanding FPDs supported by two implants placed in a two-stage procedure comprised the study group. The anterior implant was placed axially, and the posterior tilted distally. Mesial or distal inclination of each implant was measured in relation to the vertical axis perpendicular to the occlusal plane. Average bone loss was compared between straight and tilted implants, smokers, and nonsmokers. Mean angulation of the anterior axial-positioned implant was 3.45 degrees distally (range 0-8) and of the distal implants was 32.83 degrees distally (range 20-50 degrees). Average bone loss after 1, 3, and 5 years was 0.89 (SD = 0.73), 1.18 (SD = 0.74), and 1.50 (SD = 0.81), respectively, for axial implants, and 0.98 (SD = 0.69), 1.10 (SD = 0.60)...

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Research paper thumbnail of Accuracy of a laboratory-based computer implant guiding system

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2010

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Research paper thumbnail of Histomorphometric Analysis After Maxillary Sinus Floor Augmentation Using Cancellous Bone–Block Allograft

Journal of Periodontology, 2010

Cancellous bone-block allografts may contribute to improved initial implant stability during sinu... more Cancellous bone-block allografts may contribute to improved initial implant stability during sinus augmentation in cases with posterior atrophic maxillary ridge height &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; or =4 mm. The present study histologically and histomorphometrically evaluates the application of cancellous bone-block allografts for maxillary sinus-floor augmentation. Thirty-one consecutive patients, 16 females and 15 males (age range, 25 to 65 years; mean age: 54 +/- 9 years) underwent sinus augmentation with simultaneous implant placement with cancellous bone-block allografts. After 9 months, a second-stage surgery was performed. The previous window location was determined. A cylindrical sample core was collected. All specimens were prepared for histologic and histomorphometric examinations. Seventy-two of 76 implants were clinically osseointegrated (94.7%). All patients received a fixed implant-supported prosthesis. The mean t values of newly formed bone, residual cancellous bone-block allograft, marrow and connective tissue were 26.1% +/- 15% (range: 10% to 58%); 24.7% +/- 19.4% (range: 0.6% to 71%), and 49.2% +/- 20.4% (range: 14.9% to 78.9%), respectively. No statistically significant histomorphometric differences regarding newly formed bone were found between genders (27.02% in males versus 25.68% in females; P = 0.446), ages (29.82% in subjects &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; or =40 years old versus 24.43% in subjects &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;40 years old; P = 0.293), presence of membrane perforations (25.5% in non-perforated sinuses versus 27.3% in perforated sinuses; P = 0.427), and residual alveolar bone height (25.85% for residual alveolar bone height &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;2 mm versus 26.48% for residual alveolar bone height of 2 to 4 mm; P = 0.473). The cancellous bone-block allograft is biocompatible and osteoconductive and permits new bone formation in sinus augmentations with simultaneous implant-placement procedures in extremely atrophic posterior maxillae.

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Research paper thumbnail of Heat Transfer of Impression Plasters to an Implant-Bone Interface

Implant Dentistry, 2006

The purpose of this in vitro study was to measure heat generated at the implant-bone interface ca... more The purpose of this in vitro study was to measure heat generated at the implant-bone interface caused by exothermic setting reaction of 2 impression plasters. The study consisted of 20 titanium-alloy abutment impressions connected to a titanium-alloy cylindrical implant embedded in an acrylic-resin mandible in a 37 degrees C water bath. There were 2 types of impression plaster used, Snow-White (Kerr, Romulus, MI) and Xantano (Kulzer, Dormagen, Germany). Temperature changes were recorded via embedded thermocouples at the cervix and implant surface apex. Analysis of variance for repeated measures was used to compare 2 treatment groups. Temperature increased less at the implant apex (1.5 degrees-2.1 degrees C) than at the implant cervix (7.4 degrees-10.5 degrees C). Differences between the 2 impression plasters were statisticallysignificant only at the implant cervical level (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;lt; 0.05). A lower temperature increase was shown with the Snow-White compared with the Xantano. Although both plasters generated an exothermic reaction on setting (mean temperature change 22 degrees C), the increase in the temperature rate of the Snow-White was slower than the Xantano. Under the conditions of the present study, Snow-White impression plaster appears to be safer to use in implant prosthodontics compared with the Xantano because of its slower and lower exothermic reaction at the implant-bone interface. However, use of the material with the rapid setting time would require more care, such as limiting the volume of material used (e.g., by using a custom tray).

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Research paper thumbnail of Esthetic Assessment of Implants Placed into Fresh Extraction Sockets for Single-Tooth Replacements Using a Flapless Approach

Clinical Implant Dentistry and Related Research, Nov 2, 2016

To validate the concept of immediate implant placement and nonfunctional loading for use in the e... more To validate the concept of immediate implant placement and nonfunctional loading for use in the esthetically sensitive anterior maxilla, clinical trials should ideally include objective esthetic criteria. This study analyzed procedural results as graded by the pink esthetic score and white esthetic score (PES/WES). Thirty-nine suitable patients (mean follow-up 44.82 ± 28 months) were evaluated. Thirty-eight implants fulfilled stringent criteria for successful osseointegration: absence of peri-implant radiolucency, implant mobility, suppuration, and pain. The mean total PES/WES was 15.50 ± 2.67 (range: 10-20). The mean total PES of 7.92 ± 1.60 (range: 5-10) indicated favorable overall peri-implant soft-tissue conditions. Root convexity and texture (1.63 ± 0.54) and curvature of the facial mucosa (1.68 ± 0.47) and distal papilla (1.66 ± 0.48) had the highest mean values, whereas acceptable levels of facial tissue (1.53 ± 0.73) and mesial papilla (1.42 ± 0.64) were the most difficult to fully achieve. The mean mesial and distal bone loss at data collection was, was 1.19 ± 0.54 and 1.15 ± 0.51, respectively. Periodontal disease severity (advanced chronic and aggressive periodontitis) was significantly associated with a low total PES (p = .048). Objective PES/WES assessment validated immediate anterior maxillary single-tooth replacement and restoration as being a successful and esthetically predictable treatment modality in sites where the buccal bone had been preserved during the extraction at 1 year of follow-up.

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