Rosse Mary Falcón | Universidade Estadual Paulista "Júlio de Mesquita Filho" (original) (raw)

Papers by Rosse Mary Falcón

Research paper thumbnail of Technique for Indexing an Immediate Loading Implant Position for a Provisional Restoration

Journal of Oral Implantology, 2011

The transfer of an intraoral implant position to the cast for an immediate loading implant is an ... more The transfer of an intraoral implant position to the cast for an immediate loading implant is an important step and may be difficult to achieve with commonly used transfer and impression methods. Thus, the purpose of this report is to describe a technique for the use of a surgical template to transfer the implant position for fabrication of a provisional restoration. This technique simplifies the procedure, eliminates the need for taking an impression, avoids surgical site contamination, and maintains an adequate emergence profile during fabrication of the definitive restoration. An indexing technique for transferring the position of the implant from the treated surface after extraction is described.

Research paper thumbnail of Removable Partial Denture in Combination with a Milled Fixed Partial Prosthesis as Interim Restorations in Long-Term Treatment

Journal of Prosthodontics, 2010

Interim restorations are frequently used in prosthodontic treatments. Many complex situations req... more Interim restorations are frequently used in prosthodontic treatments. Many complex situations require the combination of fixed and removable partial prostheses. An appropriate interim restoration design that accurately implements the treatment plan is necessary to prepare the oral cavity for the prostheses, and to contribute to the preservation and health of remaining natural teeth, bone support, and gingival tissues. This report describes a modified technique for construction of interim restorations with a combination of fixed and removable partial prostheses. The technique consists of the construction of a milled fixed prosthesis and removable partial denture with metallic framework for use during extensive treatment, improving masticatory function and esthetics and preserving the periodontal health of supporting structures. This interim restoration can also serve as a template for the definitive restoration, allowing patient and dentist to evaluate appearance and function and helping to ensure the success of the definitive restoration.

Research paper thumbnail of Microhardness of luting agents used for fiber post cementation submitted to thermo cycling

Journal of Advanced Clinical and Research Insights, 2014

Research paper thumbnail of Esthetic Interim Acrylic Resin Prosthesis Reinforced with Metal Casting

Journal of Prosthodontics, 2009

Fabrication of an interim prosthesis is an important procedure in oral rehabilitation because it ... more Fabrication of an interim prosthesis is an important procedure in oral rehabilitation because it aids in determining the esthetics, phonetics, and occlusal relationship of the definitive restoration. The typical material (acrylic resin) used in interim prostheses commonly fails due to fractures. During extended oral rehabilitation with fixed partial prostheses, high strength interim prostheses are often required to protect hard and soft tissues, avoid dental mobility, and to allow the clinician and patient a chance to evaluate cosmetics and function before the placement of the definitive prosthesis. Furthermore, a satisfactory interim prosthesis can serve as a template for the construction of the definitive prosthesis. The maintenance of this prosthesis is important during treatment for protection of teeth and occlusal stability. Procedures to reinforce interim prostheses help to improve performance and esthetics in long-term treatment. Due to the low durability of acrylic resin in long-term use, the use of reinforcing materials, such as metal castings or spot-welded stainless steel matrix bands, is indicated in cases of extensive restoration and long-term treatment. This paper describes an easy technique for fabricating a fixed interim prosthesis using acrylic resin and a cast metallic reinforcement.

Research paper thumbnail of Photoelastic Analysis of Stress Distribution in Different Retention Systems for Facial Prosthesis

Journal of Craniofacial Surgery, 2009

Close Window. Close Window. Thank you for choosing to subscribe to the eTOC for Journal of Cranio... more Close Window. Close Window. Thank you for choosing to subscribe to the eTOC for Journal of Craniofacial Surgery. Enter your Email address: Wolters Kluwer Health may email you for journal alerts and information, but is committed ...

Research paper thumbnail of Streptococcus mutans adhesion and releasing of metallic ions in dental alloys

Brazilian Journal of Oral Sciences, 2015

Research paper thumbnail of Effect Of Implant Angulation And Prosthetic Connections On Stress Distribution

Objective: The aim of this study was to evaluate the influence of implant angulation and prosthet... more Objective: The aim of this study was to evaluate the influence of implant angulation and prosthetic connections on stress distribution through the three-dimensional finite element method Method: Six 3-D models were simulated with the aid of the SolidWorks 2010, Rhinoceros 4.0 and InVesalius softwares. Each model consisted of a bone block and an implant at differnt angulatins (0°, 17° and 30°) with different connection types (hexagonal and Morse taper) attached to a metal-ceramic crown. Model 1: Implant at 0°, model 2: Implant at 17°, model 3: Implant at 30°. The models were exported to the pre and post-processing finite element program, FEMAP 10.2, for the mesh generation and to have the boundary conditions established. An axial (200N) and oblique (100N) load was applied on the occlusal surface of the crowns. The models were analyzed by the NeiNastran 9.2 software and the results were visualized by means of Maximum Principal Stress maps. Result: In the cortical bone was observed str...

Research paper thumbnail of Evaluación de la dureza shore a en dos técnicas de impresión con siliconas por condensación bajo la influencia del uso de desinfección química por impresión con solución de clorhexidina al 2%

Acta odontológica venezolana

... Recibido para arbitraje: 27/10/2006 Aceptado para publicación: 26/06/2007 • Marcelo Coelho GO... more ... Recibido para arbitraje: 27/10/2006 Aceptado para publicación: 26/06/2007 • Marcelo Coelho GOIATO Profesor Asistente Doctor de la disciplina de Prótesis Total de la Facultad de Odontología de Araçatuba - UNESP. • Paula ...

Research paper thumbnail of Evaluation of stress distribution on the implant/crown interface

Objective: In this study an analysis was made of the influence of cuspal inclination and the dire... more Objective: In this study an analysis was made of the influence of cuspal inclination and the direction of occlusal loading on stress distribution in implant-supported prostheses. Methodology: Four models were prepared with the aid of the Rhinoceros 3.0 and SolidWorks 2006 programs and the 3D MDX-20 scanner. A mandibular section of bone with an implant and its superstructures were simulated in this study using a 1-piece 3.75 x 10 mm screw-shape dental implant system and crown with 3 different cuspal inclinations (10°, 20° and 30°). The three-dimensional models were transferred to the NEiNastran 9.0 software for the generation of the mesh of finite elements and analysis. Oblique loading (200 N) was applied on the chewing surfaces of the buccal cuspids. Next, vertical loading was applied on internal surfaces of the cuspids at four points (50 N). Results: Greater areas of stress were observed in the C model (cuspal inclination 30°) (Oblique load) in the range of 40.63-100 MPa. Conclusion: An increase in cuspal inclination increased stress in the implant/crown interface and oblique loading increased stress in the implant/crown interface. Descriptors: Dental Implantation; Dental Prosthesis, Implant-Supported; Biomechanics; Finite Element Analysis.

Research paper thumbnail of Avaliação das tensões na interface implante/coroa

... serem consideradas importantes, apenas, as forças axiais e horizontais mas também uma carga c... more ... serem consideradas importantes, apenas, as forças axiais e horizontais mas também uma carga combi-nada (força oblíqua), pois representa os movimentos látero-protrusivos durante a mastigação18. ... 473-80. 21. Steigenga JT, Al-Shammari KF, Nociti F, Misch CE, Wang HL. ...

Research paper thumbnail of Estética en prótesis removibles

Revista cubana de estomatología

Research paper thumbnail of Effect of Mechanical Cycling on Screw Torque in External Hexagon Implants with and without Platform Switching

Brazilian Dental Journal, 2015

This in vitro study evaluated the effect of mechanical cycling on the torque of retaining screw i... more This in vitro study evaluated the effect of mechanical cycling on the torque of retaining screw in external hexagon implants with platform switching (PS), regular platform (RP) and wide platform (WP). A total of 30 specimens were equally divided into 3 groups: PS, PR and WP. Each specimen was prepared with implants: 3.75 x 10 mm for RP group and 5.0x10 mm for PS and WP groups and its respective abutment with 32 Ncm torque. All groups were subjected to 106 cycles with 100 N (corresponding to about 40 months of chewing). The results were obtained with the reverse torque of each specimen and data were evaluated using ANOVA and Tukey test (p<0.05). The PS group showed statistically significant difference in screw removal torque (30.06±5.42) compared with RP (23.75±2.76) and WP (21.32±3.53) (p<0.05) groups; the RP and WP groups showed no statistically significant difference between them. It was concluded that the PS group showed higher reverse torque value, suggesting lower susceptibility of the abutment screw loosening.

Research paper thumbnail of Streptococcus mutans adhesion and releasing of metallic ions in dental alloys

Brazilian Journal of Oral Sciences, 2015

Research paper thumbnail of Influence of ridge type on mandibular distal extension removable partial denture

Acta odontológica latinoamericana : AOL, 2010

The aim of this study was to use photoelastic models to analyze the distribution of stress caused... more The aim of this study was to use photoelastic models to analyze the distribution of stress caused by the incidence of loads on a mandibular distal extension removable partial denture, both on the abutment teeth and on differently shaped residual ridges: distal ascending, descending-ascending, horizontal and distal descending. The best type of retainer and location of the rest on the last abutment tooth were determined for the different types of ridge. Four models were made from photoelastic resin (PL-1 for the teeth and PL-2 for the alveolar ridge), one for each kind of ridge. For each model, 4 removable partial dentures (RPD) were made (16 RPD altogether): T-bar retainer and distal rest, T-bar retainer and mesial rest, circumferential retainer and distal rest, and circumferential retainer and mesial rest. The models were placed on a circular polariscope and a 100 N axial load (point load) was applied to premolars and molars of the RPD. The formation of photoelastic bands was photog...

Research paper thumbnail of Effect of the Parafunctional Occlusal Loading and Crown Height on Stress Distribution

Brazilian Dental Journal, 2014

The aim of this study was to assess, by the three-dimensional finite element method, the influenc... more The aim of this study was to assess, by the three-dimensional finite element method, the influence of crown-to-implant ratio and parafunctional occlusal loading on stress distribution in single external hexagon implant-supported prosthesis. Computer-aided design software was used to confection three models. Each model was composed of a block bone and an external hexagon implant (5x10.0 mm) with screw-retained implant prostheses, varying the height crown: 10, 12.5 and 15 mm. Finite element analysis software was used to generate the finite element mesh and to establish the loading and boundary conditions. Normal (200 N axial and 100 N oblique load) and parafunctional forces (1,000 N axial and 500 N oblique load) were applied. The results were visualized by von Mises and maximum principal stress. In comparison with the normal occlusal force, the parafunctional occlusal force induced an increase in stress concentration and magnitude on implant (platform and first threads) and screw (neck). The cortical bone showed the highest tensile stress under parafunctional force (oblique load). The stress concentration increased as the crown height increased. It was concluded that: increasing the C/I increased stress concentration in both implant components and cortical bone; parafunctional loading increased between 4-5 times the value of stresses in bone tissue compared with functional loading; the type of loading variation factor is more influential than the crown-to-implant factor.

Research paper thumbnail of Evaluation of hardness and color stability in the soft lining materials after thermocycling and chemical polishing

Acta odontológica latinoamericana : AOL, 2009

The aim of this study was to evaluate the Shore A hardness and color stability of two soft lining... more The aim of this study was to evaluate the Shore A hardness and color stability of two soft lining materials after thermocycling and when chemical polishing was used or omitted. Two acrylic-based soft lining materials were tested: Coe-Soft and Soft Confort, 14 specimens were made for each material. They were distributed in four groups according to the treatment performed. The specimens were thermocycled (1000 cycles) and half of the group submitted to chemical polishing (methyl methacrylate). Shore A hardness was determined and color stability was calculated by means of Commission International de l'Eclairage Lab uniform color scale using a spectrophotometer, the measurements were made immediately after deflasked, chemical polishing and thermocycling. Analysis of variance (ANOVA) and Tukey's tests were performed at p < 0.01. Color changes (deltaE) were observed after thermocycling in both soft lining materials: Soft Confort (10.60) showed significantly higher values than C...

Research paper thumbnail of Influencia del tiempo de almacenamiento sobre la dureza y rugosidad de materiales para rebasados resilentes

RCOE, 2007

Fundamento: Los materiales para rebasados resilentes de prótesis, presentan ciertas característic... more Fundamento: Los materiales para rebasados resilentes de prótesis, presentan ciertas características clínicamente importantes que pueden alterarse con el tiempo de uso, entre ellas la dureza, y rugosidad. El objetivo de este estudio fue evaluar la influencia del almacenamiento sobre la dureza Shore A y rugosidad de cuatro materiales resilentes para rebasado. Materiales y método: Fueron utilizados 4 materiales resilentes: Dentuflex, Coe-Soft, Dentusoft y Dinabase, 3 temporales y un permanente; para cada material fueron confeccionadas 7 muestras. Se evaluó la dureza y rugosidad inicialmente, a los 30 y 90 días de almacenamiento en agua destilada a 35±2ºC. Los resultados fueron sometidos al análisis de varianza (ANOVA) y las medias comparadas por el Test de Tukey (p<0,05). Resultados: Dentuflex, Coe-Soft, Dentusoft y Dinabase presentaron los mayores valores medios iniciales de dureza, en este orden. Con respecto a la rugosidad, Dentuflex, Dentusoft, Coe-Soft y Dinabase presentaron los mayores valores medios iniciales. Después del periodo de almacenamiento se observó un aumento significativo de los valores de dureza en todos los materiales. El material Dentuflex presentó valores de rugosidad significativamente menores, mientras que los valores de los otros materiales aumentaron significativamente. Conclusión: El tiempo de almacenamiento influenció sobre la dureza y rugosidad todos los materiales.

Research paper thumbnail of Influence of Cusp Inclination on Stress Distribution in Implant-Supported Prostheses. A Three-Dimensional Finite Element Analysis

Journal of Prosthodontics, 2010

The aim of this study was to assess the influence of cusp inclination on stress distribution in i... more The aim of this study was to assess the influence of cusp inclination on stress distribution in implant-supported prostheses by 3D finite element method. Materials and Methods: Three-dimensional models were created to simulate a mandibular bone section with an implant (3.75 mm diameter × 10 mm length) and crown by means of a 3D scanner and 3D CAD software. A screw-retained single crown was simulated using three cusp inclinations (10 • , 20 • , 30 • ). The 3D models (model 10d, model 20d, and model 30d) were transferred to the finite element program NeiNastran 9.0 to generate a mesh and perform the stress analysis. An oblique load of 200 N was applied on the internal vestibular face of the metal ceramic crown. Results: The results were visualized by means of von Mises stress maps. Maximum stress concentration was located at the point of application. The implant showed higher stress values in model 30d (160.68 MPa). Cortical bone showed higher stress values in model 10d (28.23 MPa). Conclusion: Stresses on the implant and implant/abutment interface increased with increasing cusp inclination, and stresses on the cortical bone decreased with increasing cusp inclination.

Research paper thumbnail of Stress Analysis in Platform-Switching Implants: A 3-Dimensional Finite Element Study

Journal of Oral Implantology, 2012

The aim of this study was to evaluate the influence of the platform-switching technique on stress... more The aim of this study was to evaluate the influence of the platform-switching technique on stress distribution in implant, abutment, and peri-implant tissues, through a 3-dimensional finite element study. Three 3-dimensional mandibular models were fabricated using the SolidWorks 2006 and InVesalius software. Each model was composed of a bone block with one implant 10 mm long and of different diameters (3.75 and 5.00 mm). The UCLA abutments also ranged in diameter from 5.00 mm to 4.1 mm. After obtaining the geometries, the models were transferred to the software FEMAP 10.0 for pre- and postprocessing of finite elements to generate the mesh, loading, and boundary conditions. A total load of 200 N was applied in axial (0°), oblique (45°), and lateral (90°) directions. The models were solved by the software NeiNastran 9.0 and transferred to the software FEMAP 10.0 to obtain the results that were visualized through von Mises and maximum principal stress maps. Model A (implants with 3.75 mm/abutment with 4.1 mm) exhibited the highest area of stress concentration with all loadings (axial, oblique, and lateral) for the implant and the abutment. All models presented the stress areas at the abutment level and at the implant/abutment interface. Models B (implant with 5.0 mm/abutment with 5.0 mm) and C (implant with 5.0 mm/abutment with 4.1 mm) presented minor areas of stress concentration and similar distribution pattern. For the cortical bone, low stress concentration was observed in the peri-implant region for models B and C in comparison to model A. The trabecular bone exhibited low stress that was well distributed in models B and C. Model A presented the highest stress concentration. Model B exhibited better stress distribution. There was no significant difference between the large-diameter implants (models B and C).

Research paper thumbnail of Photoelastic analysis of cemented or screwed implant-supported prostheses with different prosthetic connections

Journal of Oral Implantology, 2010

... Abstract: Purpose: the aim of this study was to evaluate the stress distribution of different... more ... Abstract: Purpose: the aim of this study was to evaluate the stress distribution of different retention systems (screwed or cemented) associated to different prosthetic connections (external hexagon, internal hexagon and morse taper) in 3-unit implant-supported fixed partial ...

Research paper thumbnail of Technique for Indexing an Immediate Loading Implant Position for a Provisional Restoration

Journal of Oral Implantology, 2011

The transfer of an intraoral implant position to the cast for an immediate loading implant is an ... more The transfer of an intraoral implant position to the cast for an immediate loading implant is an important step and may be difficult to achieve with commonly used transfer and impression methods. Thus, the purpose of this report is to describe a technique for the use of a surgical template to transfer the implant position for fabrication of a provisional restoration. This technique simplifies the procedure, eliminates the need for taking an impression, avoids surgical site contamination, and maintains an adequate emergence profile during fabrication of the definitive restoration. An indexing technique for transferring the position of the implant from the treated surface after extraction is described.

Research paper thumbnail of Removable Partial Denture in Combination with a Milled Fixed Partial Prosthesis as Interim Restorations in Long-Term Treatment

Journal of Prosthodontics, 2010

Interim restorations are frequently used in prosthodontic treatments. Many complex situations req... more Interim restorations are frequently used in prosthodontic treatments. Many complex situations require the combination of fixed and removable partial prostheses. An appropriate interim restoration design that accurately implements the treatment plan is necessary to prepare the oral cavity for the prostheses, and to contribute to the preservation and health of remaining natural teeth, bone support, and gingival tissues. This report describes a modified technique for construction of interim restorations with a combination of fixed and removable partial prostheses. The technique consists of the construction of a milled fixed prosthesis and removable partial denture with metallic framework for use during extensive treatment, improving masticatory function and esthetics and preserving the periodontal health of supporting structures. This interim restoration can also serve as a template for the definitive restoration, allowing patient and dentist to evaluate appearance and function and helping to ensure the success of the definitive restoration.

Research paper thumbnail of Microhardness of luting agents used for fiber post cementation submitted to thermo cycling

Journal of Advanced Clinical and Research Insights, 2014

Research paper thumbnail of Esthetic Interim Acrylic Resin Prosthesis Reinforced with Metal Casting

Journal of Prosthodontics, 2009

Fabrication of an interim prosthesis is an important procedure in oral rehabilitation because it ... more Fabrication of an interim prosthesis is an important procedure in oral rehabilitation because it aids in determining the esthetics, phonetics, and occlusal relationship of the definitive restoration. The typical material (acrylic resin) used in interim prostheses commonly fails due to fractures. During extended oral rehabilitation with fixed partial prostheses, high strength interim prostheses are often required to protect hard and soft tissues, avoid dental mobility, and to allow the clinician and patient a chance to evaluate cosmetics and function before the placement of the definitive prosthesis. Furthermore, a satisfactory interim prosthesis can serve as a template for the construction of the definitive prosthesis. The maintenance of this prosthesis is important during treatment for protection of teeth and occlusal stability. Procedures to reinforce interim prostheses help to improve performance and esthetics in long-term treatment. Due to the low durability of acrylic resin in long-term use, the use of reinforcing materials, such as metal castings or spot-welded stainless steel matrix bands, is indicated in cases of extensive restoration and long-term treatment. This paper describes an easy technique for fabricating a fixed interim prosthesis using acrylic resin and a cast metallic reinforcement.

Research paper thumbnail of Photoelastic Analysis of Stress Distribution in Different Retention Systems for Facial Prosthesis

Journal of Craniofacial Surgery, 2009

Close Window. Close Window. Thank you for choosing to subscribe to the eTOC for Journal of Cranio... more Close Window. Close Window. Thank you for choosing to subscribe to the eTOC for Journal of Craniofacial Surgery. Enter your Email address: Wolters Kluwer Health may email you for journal alerts and information, but is committed ...

Research paper thumbnail of Streptococcus mutans adhesion and releasing of metallic ions in dental alloys

Brazilian Journal of Oral Sciences, 2015

Research paper thumbnail of Effect Of Implant Angulation And Prosthetic Connections On Stress Distribution

Objective: The aim of this study was to evaluate the influence of implant angulation and prosthet... more Objective: The aim of this study was to evaluate the influence of implant angulation and prosthetic connections on stress distribution through the three-dimensional finite element method Method: Six 3-D models were simulated with the aid of the SolidWorks 2010, Rhinoceros 4.0 and InVesalius softwares. Each model consisted of a bone block and an implant at differnt angulatins (0°, 17° and 30°) with different connection types (hexagonal and Morse taper) attached to a metal-ceramic crown. Model 1: Implant at 0°, model 2: Implant at 17°, model 3: Implant at 30°. The models were exported to the pre and post-processing finite element program, FEMAP 10.2, for the mesh generation and to have the boundary conditions established. An axial (200N) and oblique (100N) load was applied on the occlusal surface of the crowns. The models were analyzed by the NeiNastran 9.2 software and the results were visualized by means of Maximum Principal Stress maps. Result: In the cortical bone was observed str...

Research paper thumbnail of Evaluación de la dureza shore a en dos técnicas de impresión con siliconas por condensación bajo la influencia del uso de desinfección química por impresión con solución de clorhexidina al 2%

Acta odontológica venezolana

... Recibido para arbitraje: 27/10/2006 Aceptado para publicación: 26/06/2007 • Marcelo Coelho GO... more ... Recibido para arbitraje: 27/10/2006 Aceptado para publicación: 26/06/2007 • Marcelo Coelho GOIATO Profesor Asistente Doctor de la disciplina de Prótesis Total de la Facultad de Odontología de Araçatuba - UNESP. • Paula ...

Research paper thumbnail of Evaluation of stress distribution on the implant/crown interface

Objective: In this study an analysis was made of the influence of cuspal inclination and the dire... more Objective: In this study an analysis was made of the influence of cuspal inclination and the direction of occlusal loading on stress distribution in implant-supported prostheses. Methodology: Four models were prepared with the aid of the Rhinoceros 3.0 and SolidWorks 2006 programs and the 3D MDX-20 scanner. A mandibular section of bone with an implant and its superstructures were simulated in this study using a 1-piece 3.75 x 10 mm screw-shape dental implant system and crown with 3 different cuspal inclinations (10°, 20° and 30°). The three-dimensional models were transferred to the NEiNastran 9.0 software for the generation of the mesh of finite elements and analysis. Oblique loading (200 N) was applied on the chewing surfaces of the buccal cuspids. Next, vertical loading was applied on internal surfaces of the cuspids at four points (50 N). Results: Greater areas of stress were observed in the C model (cuspal inclination 30°) (Oblique load) in the range of 40.63-100 MPa. Conclusion: An increase in cuspal inclination increased stress in the implant/crown interface and oblique loading increased stress in the implant/crown interface. Descriptors: Dental Implantation; Dental Prosthesis, Implant-Supported; Biomechanics; Finite Element Analysis.

Research paper thumbnail of Avaliação das tensões na interface implante/coroa

... serem consideradas importantes, apenas, as forças axiais e horizontais mas também uma carga c... more ... serem consideradas importantes, apenas, as forças axiais e horizontais mas também uma carga combi-nada (força oblíqua), pois representa os movimentos látero-protrusivos durante a mastigação18. ... 473-80. 21. Steigenga JT, Al-Shammari KF, Nociti F, Misch CE, Wang HL. ...

Research paper thumbnail of Estética en prótesis removibles

Revista cubana de estomatología

Research paper thumbnail of Effect of Mechanical Cycling on Screw Torque in External Hexagon Implants with and without Platform Switching

Brazilian Dental Journal, 2015

This in vitro study evaluated the effect of mechanical cycling on the torque of retaining screw i... more This in vitro study evaluated the effect of mechanical cycling on the torque of retaining screw in external hexagon implants with platform switching (PS), regular platform (RP) and wide platform (WP). A total of 30 specimens were equally divided into 3 groups: PS, PR and WP. Each specimen was prepared with implants: 3.75 x 10 mm for RP group and 5.0x10 mm for PS and WP groups and its respective abutment with 32 Ncm torque. All groups were subjected to 106 cycles with 100 N (corresponding to about 40 months of chewing). The results were obtained with the reverse torque of each specimen and data were evaluated using ANOVA and Tukey test (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;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). The PS group showed statistically significant difference in screw removal torque (30.06±5.42) compared with RP (23.75±2.76) and WP (21.32±3.53) (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;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) groups; the RP and WP groups showed no statistically significant difference between them. It was concluded that the PS group showed higher reverse torque value, suggesting lower susceptibility of the abutment screw loosening.

Research paper thumbnail of Streptococcus mutans adhesion and releasing of metallic ions in dental alloys

Brazilian Journal of Oral Sciences, 2015

Research paper thumbnail of Influence of ridge type on mandibular distal extension removable partial denture

Acta odontológica latinoamericana : AOL, 2010

The aim of this study was to use photoelastic models to analyze the distribution of stress caused... more The aim of this study was to use photoelastic models to analyze the distribution of stress caused by the incidence of loads on a mandibular distal extension removable partial denture, both on the abutment teeth and on differently shaped residual ridges: distal ascending, descending-ascending, horizontal and distal descending. The best type of retainer and location of the rest on the last abutment tooth were determined for the different types of ridge. Four models were made from photoelastic resin (PL-1 for the teeth and PL-2 for the alveolar ridge), one for each kind of ridge. For each model, 4 removable partial dentures (RPD) were made (16 RPD altogether): T-bar retainer and distal rest, T-bar retainer and mesial rest, circumferential retainer and distal rest, and circumferential retainer and mesial rest. The models were placed on a circular polariscope and a 100 N axial load (point load) was applied to premolars and molars of the RPD. The formation of photoelastic bands was photog...

Research paper thumbnail of Effect of the Parafunctional Occlusal Loading and Crown Height on Stress Distribution

Brazilian Dental Journal, 2014

The aim of this study was to assess, by the three-dimensional finite element method, the influenc... more The aim of this study was to assess, by the three-dimensional finite element method, the influence of crown-to-implant ratio and parafunctional occlusal loading on stress distribution in single external hexagon implant-supported prosthesis. Computer-aided design software was used to confection three models. Each model was composed of a block bone and an external hexagon implant (5x10.0 mm) with screw-retained implant prostheses, varying the height crown: 10, 12.5 and 15 mm. Finite element analysis software was used to generate the finite element mesh and to establish the loading and boundary conditions. Normal (200 N axial and 100 N oblique load) and parafunctional forces (1,000 N axial and 500 N oblique load) were applied. The results were visualized by von Mises and maximum principal stress. In comparison with the normal occlusal force, the parafunctional occlusal force induced an increase in stress concentration and magnitude on implant (platform and first threads) and screw (neck). The cortical bone showed the highest tensile stress under parafunctional force (oblique load). The stress concentration increased as the crown height increased. It was concluded that: increasing the C/I increased stress concentration in both implant components and cortical bone; parafunctional loading increased between 4-5 times the value of stresses in bone tissue compared with functional loading; the type of loading variation factor is more influential than the crown-to-implant factor.

Research paper thumbnail of Evaluation of hardness and color stability in the soft lining materials after thermocycling and chemical polishing

Acta odontológica latinoamericana : AOL, 2009

The aim of this study was to evaluate the Shore A hardness and color stability of two soft lining... more The aim of this study was to evaluate the Shore A hardness and color stability of two soft lining materials after thermocycling and when chemical polishing was used or omitted. Two acrylic-based soft lining materials were tested: Coe-Soft and Soft Confort, 14 specimens were made for each material. They were distributed in four groups according to the treatment performed. The specimens were thermocycled (1000 cycles) and half of the group submitted to chemical polishing (methyl methacrylate). Shore A hardness was determined and color stability was calculated by means of Commission International de l'Eclairage Lab uniform color scale using a spectrophotometer, the measurements were made immediately after deflasked, chemical polishing and thermocycling. Analysis of variance (ANOVA) and Tukey's tests were performed at p < 0.01. Color changes (deltaE) were observed after thermocycling in both soft lining materials: Soft Confort (10.60) showed significantly higher values than C...

Research paper thumbnail of Influencia del tiempo de almacenamiento sobre la dureza y rugosidad de materiales para rebasados resilentes

RCOE, 2007

Fundamento: Los materiales para rebasados resilentes de prótesis, presentan ciertas característic... more Fundamento: Los materiales para rebasados resilentes de prótesis, presentan ciertas características clínicamente importantes que pueden alterarse con el tiempo de uso, entre ellas la dureza, y rugosidad. El objetivo de este estudio fue evaluar la influencia del almacenamiento sobre la dureza Shore A y rugosidad de cuatro materiales resilentes para rebasado. Materiales y método: Fueron utilizados 4 materiales resilentes: Dentuflex, Coe-Soft, Dentusoft y Dinabase, 3 temporales y un permanente; para cada material fueron confeccionadas 7 muestras. Se evaluó la dureza y rugosidad inicialmente, a los 30 y 90 días de almacenamiento en agua destilada a 35±2ºC. Los resultados fueron sometidos al análisis de varianza (ANOVA) y las medias comparadas por el Test de Tukey (p<0,05). Resultados: Dentuflex, Coe-Soft, Dentusoft y Dinabase presentaron los mayores valores medios iniciales de dureza, en este orden. Con respecto a la rugosidad, Dentuflex, Dentusoft, Coe-Soft y Dinabase presentaron los mayores valores medios iniciales. Después del periodo de almacenamiento se observó un aumento significativo de los valores de dureza en todos los materiales. El material Dentuflex presentó valores de rugosidad significativamente menores, mientras que los valores de los otros materiales aumentaron significativamente. Conclusión: El tiempo de almacenamiento influenció sobre la dureza y rugosidad todos los materiales.

Research paper thumbnail of Influence of Cusp Inclination on Stress Distribution in Implant-Supported Prostheses. A Three-Dimensional Finite Element Analysis

Journal of Prosthodontics, 2010

The aim of this study was to assess the influence of cusp inclination on stress distribution in i... more The aim of this study was to assess the influence of cusp inclination on stress distribution in implant-supported prostheses by 3D finite element method. Materials and Methods: Three-dimensional models were created to simulate a mandibular bone section with an implant (3.75 mm diameter × 10 mm length) and crown by means of a 3D scanner and 3D CAD software. A screw-retained single crown was simulated using three cusp inclinations (10 • , 20 • , 30 • ). The 3D models (model 10d, model 20d, and model 30d) were transferred to the finite element program NeiNastran 9.0 to generate a mesh and perform the stress analysis. An oblique load of 200 N was applied on the internal vestibular face of the metal ceramic crown. Results: The results were visualized by means of von Mises stress maps. Maximum stress concentration was located at the point of application. The implant showed higher stress values in model 30d (160.68 MPa). Cortical bone showed higher stress values in model 10d (28.23 MPa). Conclusion: Stresses on the implant and implant/abutment interface increased with increasing cusp inclination, and stresses on the cortical bone decreased with increasing cusp inclination.

Research paper thumbnail of Stress Analysis in Platform-Switching Implants: A 3-Dimensional Finite Element Study

Journal of Oral Implantology, 2012

The aim of this study was to evaluate the influence of the platform-switching technique on stress... more The aim of this study was to evaluate the influence of the platform-switching technique on stress distribution in implant, abutment, and peri-implant tissues, through a 3-dimensional finite element study. Three 3-dimensional mandibular models were fabricated using the SolidWorks 2006 and InVesalius software. Each model was composed of a bone block with one implant 10 mm long and of different diameters (3.75 and 5.00 mm). The UCLA abutments also ranged in diameter from 5.00 mm to 4.1 mm. After obtaining the geometries, the models were transferred to the software FEMAP 10.0 for pre- and postprocessing of finite elements to generate the mesh, loading, and boundary conditions. A total load of 200 N was applied in axial (0°), oblique (45°), and lateral (90°) directions. The models were solved by the software NeiNastran 9.0 and transferred to the software FEMAP 10.0 to obtain the results that were visualized through von Mises and maximum principal stress maps. Model A (implants with 3.75 mm/abutment with 4.1 mm) exhibited the highest area of stress concentration with all loadings (axial, oblique, and lateral) for the implant and the abutment. All models presented the stress areas at the abutment level and at the implant/abutment interface. Models B (implant with 5.0 mm/abutment with 5.0 mm) and C (implant with 5.0 mm/abutment with 4.1 mm) presented minor areas of stress concentration and similar distribution pattern. For the cortical bone, low stress concentration was observed in the peri-implant region for models B and C in comparison to model A. The trabecular bone exhibited low stress that was well distributed in models B and C. Model A presented the highest stress concentration. Model B exhibited better stress distribution. There was no significant difference between the large-diameter implants (models B and C).

Research paper thumbnail of Photoelastic analysis of cemented or screwed implant-supported prostheses with different prosthetic connections

Journal of Oral Implantology, 2010

... Abstract: Purpose: the aim of this study was to evaluate the stress distribution of different... more ... Abstract: Purpose: the aim of this study was to evaluate the stress distribution of different retention systems (screwed or cemented) associated to different prosthetic connections (external hexagon, internal hexagon and morse taper) in 3-unit implant-supported fixed partial ...