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1.
Int J Oral Maxillofac Implants ; 35(3): 479-484, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32406643

RESUMEN

PURPOSE: This in vitro study evaluated the effectiveness of a sealing agent on vertical misfit of the implant-abutment interface in an external hexagon implant system before and after mechanical cyclic loading. Effects on preload maintenance of retaining screws after mechanical cycling were also assessed. MATERIALS AND METHODS: External hexagon implant systems were divided into two groups (n = 12) according to the presence of an anaerobic sealing gel (control group-no sealing gel; experimental group-sealing gel applied). A prefabricated UCLA abutment was attached to the external hexagon implant with a digital torque wrench in accordance with the recommendations of the manufacturer. Specimens were tested through mechanical cyclic loading (1 × 106 cycles, 2 Hz, and 130 N). Vertical misfit of the implant-abutment interface was analyzed using a stereomicroscope, and reverse torque values were obtained using a digital wrench. Misfit and reverse torque data were measured and analyzed via analysis of variance (ANOVA) and the Tukey least significant difference test (α = .05). RESULTS: The sealing gel promoted lower vertical misfit values in the test group after mechanical cycling compared with before cycling (P = .009). The control group showed lower reverse torque values for retaining screws compared with the initial torque after mechanical cyclic loading (P < .0001). However, sealing gel application promoted higher reverse torque values in the test group postcycling (P = .0003). CONCLUSION: Anaerobic sealing agent application improved vertical misfit of the implant-abutment interface and preload maintenance of screw-retained implant-supported prostheses post-mechanical cycling.


Asunto(s)
Pilares Dentales , Implantes Dentales , Diseño de Implante Dental-Pilar , Prótesis Dental de Soporte Implantado , Análisis del Estrés Dental , Torque
3.
Gen Dent ; 68(2): 44-49, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32105226

RESUMEN

The aim of this study was to evaluate the degree of conversion of resin cements polymerized under different ceramic systems. Forty specimens of RelyX ARC (3M ESPE) and Maxcem Elite (Kerr) resin cements were polymerized under 5 types of dental ceramics: feldspathic, aluminum oxide-reinforced, aluminum oxide-based strengthened with zirconium oxide, leucite-reinforced, and lithium disilicate-reinforced. Measurements of the degree of conversion of the resin cements were performed 10 minutes, 1 hour, and 24 hours after curing using a Fourier transform infrared spectrophotometer. The values were subjected to a 3-way repeated-measures analysis of variance, and the means were compared with the Fisher protected least significant difference test (α = 0.05). The study findings showed that RelyX ARC resin cement displayed a higher degree of conversion than Maxcem Elite (P < 0.05). The degree of conversion was significantly lower for RelyX ARC polymerized under aluminum oxide ceramic and aluminum oxide ceramic strengthened with zirconium oxide (P < 0.05). For Maxcem Elite, there was no significant difference in the degree of conversion attained under the various ceramics (P > 0.05). For both cements, the degree of conversion increased gradually up to 24 hours after curing (P < 0.05). The ceramic system used directly influenced the degree of conversion of RelyX ARC. Both resin cements displayed an increase in the degree of conversion over time.


Asunto(s)
Cerámica , Cementos de Resina , Porcelana Dental , Ensayo de Materiales , Polimerizacion
4.
J Oral Implantol ; 46(2): 163-171, 2020 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-31905318

RESUMEN

The purpose of this systematic review was to evaluate the literature available for materials exhibiting the best efficacy in preventing biofilm formation in the interior of implants. We searched PubMed/MEDLINE, Scopus, and Cochrane databases. This review is registered with the PROSPERO database and followed the suitability of the PRISMA protocol. The initial search resulted in 326 articles from the databases. After they were read, 8 articles remained, and the inclusion and exclusion criteria were applied. Six of these 8 articles were classified as in vitro and 2 were classified as in situ. The regions of the implants evaluated ranged from the interface of the pieces to the occlusal upper access of the abutment. The implant connections evaluated the Morse taper, external connection, and internal connection. Meta-analysis of the quantitative data was performed at a significance level of .05. Cotton exhibited poor control of infiltration, even in combination with other materials. Isolated gutta-percha (GP) and polytetrafluoroethylene (PTFE) tape with composite resin (CR) or GP performed better as physical barriers. The best results for chemical barriers were observed by the application of 1% chlorhexidine gluconate (CG) gel, thymol varnish, and the deposition of Ag films onto the surface. The applied meta-analysis did not show a significant difference in comparison between the different types of implant connections (P > .05). The application of CG and thymol varnish antimicrobials was effective in preventing biofilm formation and easy clinical execution; these could be used in combination with CR, GP, and PTFE.


Asunto(s)
Diseño de Implante Dental-Pilar , Implantes Dentales , Biopelículas , Pilares Dentales , Prótesis Dental de Soporte Implantado
5.
Artículo en Inglés | MEDLINE | ID: mdl-31815983

RESUMEN

The purpose of this study was to evaluate the intensity of light-curing units and its relationship with the color stability and microhardness of composite resins with different shades subjected to a thermocycling procedure. Eighty blocks (5.0 × 2.0 mm) of TPH Spectrum composite resin (Dentsply Sirona) were produced and distributed into four groups according to the light-curing units (EC 450, ECEL; Valo, Ultradent) and color of the resin material (A3; C3) (n = 20). Within each group, color stability was measured on half the sample (n = 10) using a UV-2450 visible UV spectrophotometer (Shimadzu), and Knoop hardness was measured on the other half (n = 10) using an HMV 2000 microhardness tester (Shimadzu) before and after thermocycling (12,000 cycles, 5°C and 55°C). Mann-Whitney test was performed on the color stability data; the microhardness data were analyzed using a three-way analysis of variance (ANOVA) and Tukey test (α = .05). The ANOVA results showed that thermocycling, distinct light intensity, and different colors of resin materials influenced the microhardness of the composite resins, which was evidenced by the A3 composite resin light-cured with a Valo polywave showing higher hardness values. There was no statistical difference in the color stability of the A3 composite resin; however, the C3 composite resin light-cured with an EC 450 singlewave light-curing unit showed higher color alteration values. In general, the Valo polywave light-curing unit imparted better mechanical property and color stability to both shades of the composite resins. The different shades of resin material influenced the hardness of the composite resins. Therefore, the light intensity of the light-curing units should be evaluated and monitored, as the amount of light intensity will interfere in the quality and longevity of resin restorations.


Asunto(s)
Resinas Compuestas , Luces de Curación Dental , Color , Dureza , Ensayo de Materiales
6.
Gen Dent ; 68(1): 72-77, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-31859667

RESUMEN

This study evaluated the Martens hardness (HM) and elastic modulus (EIT) of resin cement and dentin underlying the bonding interface of customized glass fiber posts luted to intraradicular dentin and subjected to mechanical cycling. Two null hypotheses were tested: (1) no differences in the mechanical properties (HM and EIT) of the resin cement and underlying dentin would be found between customized and noncustomized glass fiber post groups, with or without mechanical cycling; and (2) no differences in the mechanical properties of the resin cement or underlying dentin would be found between the cervical, middle, and apical thirds of the intraradicular dentin. Forty single-rooted premolars were divided into 4 groups: customized or noncustomized glass fiber post, with or without mechanical cycling. The noncustomized posts were cemented in their original state to prepared canals, while the customized posts were modified with composite resin according to the geometry of the root canal. The specimens in the mechanical cycling groups were positioned at a 45-degree angle in an electromechanical fatigue testing machine and subjected to loading with a steel tip with a 4-mm diameter for 1,200,000 cycles at 50 N. After the specimens were prepared according to the appropriate group protocol, they were sectioned into thirds, and HM and EIT values of the resin cement and dentin underlying the bonding interface were determined using an ultramicrohardness tester under a load of 5 mN. A 2-way repeated-measures analysis of variance with post hoc Tukey test was performed. For resin cement in the cervical region, the highest HM and EIT values were observed in the noncustomized group after mechanical cycling. Similarly, in the underlying dentin, specimens in the noncustomized group after mechanical cycling had the highest HM values in the cervical region. Therefore, customization of glass fiber posts with composite resin is not essential for bonding to intraradicular dentin.


Asunto(s)
Recubrimiento Dental Adhesivo , Vidrio , Técnica de Perno Muñón , Cementos de Resina , Resinas Compuestas , Materiales Dentales , Cavidad Pulpar , Dentina , Ensayo de Materiales , Estrés Mecánico
7.
PLoS One ; 14(10): e0223148, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31639129

RESUMEN

The aim of this research was to evaluate the efficacy of a commercial sealing agent at the abutment/implant interface against microleakage of single and dual-species biofilms of Candida albicans and Enterococcus faecalis into external hexagon (EH) and Morse taper (MT) prosthetic connections. A total of 216 samples of implants and their abutments were tested. Six groups (n = 36) were evaluated based on biofilm and period of incubation (7 and 14 days). The implant connections EH and MT (n = 18) were divided according to the use of the material (n = 9) (EH-T and MT-T: with the sealing agent; EH-C and MT-C: control). The biofilms were analyzed by microbial counting (CFU/mL) and SEM analysis and photographs of the material in the screw joints were also taken. Data were analyzed by Student t test, two-way ANOVA and Bonferroni test. For the single-species biofilms, there was a significant reduction in the growth of E. faecalis when compared MT-C and MT-T or EH-C and EH-T at 7 and 14 days. The same was observed for C. albicans biofilms. For dual-species biofilms of E. faecalis and C. albicans, the sealing agent was more effective in preventing microbial infiltration into the MT connection at 14 days, while microbial infiltration did not occur into EH connections even in absence of the sealing agent for both periods of evaluation. Overall, these data suggest that the presence of the sealing agent reduces or eliminates the microleakage of E. faecalis and C. albicans biofilms into the implants regardless of the period of incubation.


Asunto(s)
Tornillos Óseos/microbiología , Candida albicans/efectos de los fármacos , Materiales Dentales/farmacología , Enterococcus faecalis/efectos de los fármacos , Biopelículas/crecimiento & desarrollo , Tornillos Óseos/efectos adversos , Candida albicans/crecimiento & desarrollo , Candida albicans/patogenicidad , Pilares Dentales/microbiología , Implantes Dentales/microbiología , Análisis del Estrés Dental , Enterococcus faecalis/crecimiento & desarrollo , Humanos , Ensayo de Materiales/métodos , Titanio/química , Titanio/uso terapéutico
8.
PLoS One ; 14(6): e0217750, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31242198

RESUMEN

This study evaluated the influence of silver nanoparticle on mechanical properties of the components of underlying dentin and resin cement in different regions of intraradicular dentin. Ninety extracted single-rooted human teeth were used in this study. After endodontic preparation, the teeth were divided into five groups, according to the irrigating agents: distilled water, 5.25% sodium hypochlorite, 25% polyacrylic acid, 2% chlorhexidine and 23 ppm silver nanoparticles dispersion. Then, the groups were divided in 3 subgroups (n = 6) according to the technique adopted for adhesive cementation: SUA group: Scotchbond Universal Adhesive + RelyX ARC; U200 group: RelyX U200; and MCE group: MaxCem Elite. The mechanical properties of hardness and elastic modulus were measured in resin cement and underlying dentin in ultra-micro hardness tester in different thirds of radicular dentin surface. Data were subjected to ANOVA and Fisher's test (p = 0.05). In the underlying dentin, in general, there was no statistically significant difference in different thirds of intraradicular dentin according to the different solutions used. In the resin cements, higher hardness values were found, in general, for the cervical third. When silver nanoparticle solution was used, higher mechanical properties were generally obtained for resin cement for the SBU and U200 groups, with little or no changes in mechanical properties for the dentin. Silver nanoparticle application is a viable option for irrigation the intraradicular dentin previously through the cementation process of glass fiber posts. The mechanical properties are influenced by irrigant solutions used and the depth intraradical analyzed area.


Asunto(s)
Dentina/química , Nanopartículas del Metal/química , Cementos de Resina/química , Plata/química , Cementación , Ensayo de Materiales , Preparación del Conducto Radicular , Propiedades de Superficie
9.
J Indian Prosthodont Soc ; 19(2): 197-200, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31040556

RESUMEN

This case report aimed to describe the clinical considerations in oral rehabilitation with prostheses on implants in the anterior region, using emergence profile customization technique during implant transfer. A patient presented with a missing left upper central incisor and with not satisfactory esthetic in the other upper incisors. After diagnosis, a treatment plan was elaborated: implant placement in this region; ceramic laminates for teeth 11 and 22, and full crown for tooth 12. During the impression procedure, the implant transfer was customized by copying the gingival profile. The prostheses were made using IPS e.max ceramic system and luted with resin cement. The patient was submitted to annual follow-up examinations that did not show any irregularity or deficiency in the prostheses. The technique performed is a viable alternative that can be used in oral rehabilitation with implants involving anterior teeth because it allows a predictable level of adaptation.

10.
Braz Dent J ; 30(2): 106-116, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-30970052

RESUMEN

The aim of this study was to evaluate the push-out bond strength and interface permeability of glass-fiber posts in different regions of post space (cervical, middle, and apical) submitted to different irrigation solutions. Ninety single-rooted human teeth were submitted to endodontic treatment and divided into five groups, according to irrigation solutions: distilled water, 5.25% NaOCl, 25% polyacrylic acid, 2% chlorhexidine, and 23 ppm Ag NP dispersion. Each group was divided in 3 subgroups (n=6) according to cementation: SBU: Adper Scotchbond Universal + RelyX ARC; U200: RelyX U200; MCE: MaxCem Elite. Bond strength and sealing ability were measured in different areas of post space. The data was subjected to ANOVA and Fisher's test (a=0,05). The silver nanoparticle solution showed highest bond strength values and lowest interface permeability in all thirds analyzed for SBU group. In the U200 group, the highest bond strength values were found for sodium hypochlorite solution, with significant difference between this solution and polyacrylic acid. A decrease in bond strength values in cervical to apical direction was found for MCE group and the same behavior were found for others groups. Regarding interface permeability, use of silver nanoparticle solution resulted in lower values in cervical and apical thirds. There was a decrease in bond strength in cervical to apical direction. Different irrigation solutions and intraradicular depth influenced the bond strength and interface permeability of adhesive material to dentin substrate. Silver nanoparticle solution can effectively be used as an irrigation agent in post space prior to fiber post cementation process.


Asunto(s)
Recubrimiento Dental Adhesivo , Nanopartículas del Metal , Técnica de Perno Muñón , Dentina , Vidrio , Humanos , Ensayo de Materiales , Cementos de Resina , Plata
11.
Braz. dent. j ; 30(2): 106-116, Mar.-Apr. 2019. tab, graf
Artículo en Inglés | LILACS-Express | LILACS | ID: biblio-1001439

RESUMEN

Abstract The aim of this study was to evaluate the push-out bond strength and interface permeability of glass-fiber posts in different regions of post space (cervical, middle, and apical) submitted to different irrigation solutions. Ninety single-rooted human teeth were submitted to endodontic treatment and divided into five groups, according to irrigation solutions: distilled water, 5.25% NaOCl, 25% polyacrylic acid, 2% chlorhexidine, and 23 ppm Ag NP dispersion. Each group was divided in 3 subgroups (n=6) according to cementation: SBU: Adper Scotchbond Universal + RelyX ARC; U200: RelyX U200; MCE: MaxCem Elite. Bond strength and sealing ability were measured in different areas of post space. The data was subjected to ANOVA and Fisher's test (a=0,05). The silver nanoparticle solution showed highest bond strength values and lowest interface permeability in all thirds analyzed for SBU group. In the U200 group, the highest bond strength values were found for sodium hypochlorite solution, with significant difference between this solution and polyacrylic acid. A decrease in bond strength values in cervical to apical direction was found for MCE group and the same behavior were found for others groups. Regarding interface permeability, use of silver nanoparticle solution resulted in lower values in cervical and apical thirds. There was a decrease in bond strength in cervical to apical direction. Different irrigation solutions and intraradicular depth influenced the bond strength and interface permeability of adhesive material to dentin substrate. Silver nanoparticle solution can effectively be used as an irrigation agent in post space prior to fiber post cementation process.


Resumo O objetivo deste trabalho foi avaliar a resistência de união e permeabilidade da interface de pinos de fibra de vidro nos diferentes terços da dentina intrarradicular (cervical, médio e apical) submetidos a diferentes agentes irrigantes. Noventa dentes unirradiculares humanos foram submetidos ao tratamento endodôntico e foram divididos em cinco grupos de acordo com os agentes irrigantes: água destilada, hipoclorito de sódio 5,25%, ácido poliacrílico 25%, clorexidina 2% e dispersão de nanopartícula de prata à 23 ppm. Os grupos foram divididos em 3 subgrupos (n=6) de acordo com a técnica adotada para cimentação adesiva dos pinos de fibra de vidro: Grupo SBU: sistema adesivo ScotchbondTM Universal + cimento resinoso RelyX ARC; Grupo U200: cimento resinoso autoadesivo RelyX U200; Grupo MCE: cimento resinoso autoadesivo Maxcem Elite. A resistência de união e a permeabilidade da interface foram mensurados em diferentes áreas da dentina intrarradicular. Os dados foram submetidos a ANOVA e teste de Fisher (a=0,05). Amostras representativas foram levadas à microscopia eletrônica de varredura. A solução de nanopartícula de prata apresentou os maiores valores de resistência de união em todos os terços analisados para o grupo SBU. No grupo U200, os maiores valores foram encontrados para a solução de hipoclorito de sódio, com diferença para o ácido poliacrílico. Observou-se uma diminuição nos valores de resistência de união na direção cérvico-apical para o grupo MCE e o mesmo comportamento foram encontrados para os demais grupos. Com relação a permeabilidade da interface, o uso da solução de nanopartícula de prata resultou em menores valores nos terços cervical e apical. Houve diminuição dos valores de resistência de união no sentido cérvico-apical. As diferentes soluções irrigantes, bem como a profundidade intrarradicular influenciaram a resistência de união e permeabilidade da interface dos materiais adesivos ao substrato dentinário. A nanopartícula de prata pode ser utilizada como agente irrigador do conduto radicular previamente à cimentação de pinos de fibra de vidro.

12.
Braz. j. oral sci ; 18: e191451, jan.-dez. 2019. ilus
Artículo en Inglés | LILACS, BBO - Odontología | ID: biblio-1087501

RESUMEN

Aim The aim of this study is to evaluate the degree of conversion (DC) of resin cements polymerized under different thicknesses of feldspathic dental ceramic. Methods: Forty samples of RelyX ARC and RelyX Veneer resin cements were polymerized under Starlight feldspathic ceramic discs (DeguDent Gmbh) with 0.5 mm, 1.2 mm, 1.8 mm, and 2.4 mm in thickness. The control group was cured without the interposition of ceramic. The DC measurements were performed 10 minutes, 1 hour, and 24 hours after the light-activation in a Nexus 670 FTIR spectrophotometer. Data were analyzed by two-way repeated measure ANOVA and Fisher PLSD test. Results: The RelyX ARC showed higher DC for all ceramic thicknesses. There was significant decrease in DC related to an increase in ceramic thickness. For RelyX ARC, the values of DC obtained after 1 hour and 24 hours did not differ statistically between them, but they were higher than those analyzed after 10 minutes. For RelyX Veneer cement, there was gradual increase in the DC up to 24 hours. Conclusion: The higher the thicknesses of ceramic, the lower DC of the resin cement


Asunto(s)
Cerámica , Cementos de Resina , Polimerizacion
13.
Arch. Health Invest ; 7(12): 508-510, dez. 2018. ilus
Artículo en Portugués | BBO - Odontología | ID: biblio-994820

RESUMEN

A oclusão equilibrada e em perfeita harmonia é objetivo primordial em prótese total. Este trabalho tem como objetivo mostrar a influência da utilização dos princípios na confecção de prótese total e seu resultado. Paciente do sexo feminino, 67 anos, portadora de prótese total bimaxilar buscou atendimento especializado tendo como queixa principal mobilidade de sua prótese total superior, acompanhada de queixa estética. Dentre os planos de tratamento propostos, foi realizada a confecção de novas próteses totais respeitando princípios e passos visando o reestabelecimento de função e estética. No momento da instalação observou-se a oclusão bilateral balanceada, tendo objetivo do tratamento alcançado. A confecção de prótese odontológica deve respeitar os princípios básicos e fundamentais de confecção, bem como os requisitos inerentes às possibilidades reabilitadoras, tendo em vista que o seu resultado influencia diretamente na qualidade de vida do paciente(AU)


The right balanced occlusion and perfect harmony are the main target in full arch prosthesis. The aim of this work is to evidence the influence on correct use of full arch prosthetic rehabilitation precepts in manufacture and its result. A 67-year-old female patient with a total bimaxillary prosthesis sought specialized care having as main complaint the mobility of her maxillary total prosthesis and aesthetic complaint. Among the proposed treatment plans, it was carried out making new dentures respecting principles and steps towards the function and aesthetics re-establishment. When installing observed balanced bilateral occlusion, with the aim reached treatment. The preparation of dental prosthesis must respect the steps and basic principles of preparation and requirements inherent to rehabilitation possibilities, considering that its result directly influences the quality of life of patient(AU)


La oclusión equilibrada y en perfecta armonía eres objetivo primordial en prótesis total. Este trabajo tiene como objetivo mostrar la influencia de la utilización de los básicos principios en la confección de prótesis total y su resultado. Paciente, sexo femenino, 67 años, hace uso de prótesis total bimaxilar recurrió al atendimiento especializado y como principal reclamación la movilidad de su prótesis total superior tan cómo la estética. Entre las proposiciones de planos de tratamiento, se fue realizada la confección de nuevo par de prótesis totales respetando los principios y etapas en busca de la devolución de función y estética. Al momento de la instalación se fue posible observar la oclusión bilateral balanceada, teniendo el objetivo alcanzado. Para que la prótesis odontológica sea confeccionada se debe respetar los principios básicos fundamentales de la confección y los requisitos inherentes a las posibilidades rehabilitadoras, observando que su resultado tiene directa influencia en la calidad de vida del paciente(AU)


Asunto(s)
Humanos , Femenino , Anciano , Oclusión Dental , Dentadura Completa , Estética Dental , Calidad de Vida
14.
Eur J Dent ; 12(3): 446-449, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30147415

RESUMEN

This case report presents a minimally invasive diastema treatment using cordless gingival displacement system allowing a very conservative intervention. A 32-year-old female patient who presented with diastema in her upper front teeth opted for a treatment using laminate veneers to ensure achieving adequate tooth proportion and gingival levels. Having a displacement material that exerts excessive pressure during the displacement process can lead to disruption of the junctional epithelium and damage to periodontal tissues. This case report focuses on the effectiveness of the use of a minimally invasive method of gingival management. Two-year follow-up no infiltration, sensitivities, or fractures were detected on teeth, and indirect restorations, the purposed treatment allowed a quick, effective, and durable resolution for diastema.

15.
Int J Oral Maxillofac Implants ; 33(1): 123­126, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-28938032

RESUMEN

PURPOSE: The aim of this study was to evaluate the effect of sealing agents on preload maintenance of screw joints. MATERIALS AND METHODS: A total of four groups (n = 10 in each group) of abutment/implant systems, including external hexagon implants and antirotational UCLA abutments with a metallic collar in cobalt-chromium alloy, were assessed. In the control group (CG), no sealing agent was used at the abutment screw/implant interface. In the other groups, three different sealing agents were used at the abutment screw/implant interface: anaerobic sealing agent for medium torque (ASMT), anaerobic sealing agent for high torque (ASHT), and cyanoacrylate-based bonding agent (CYAB). All abutments were attached to the implants at 32 ± 1 N.cm. After 48 ± 2 hours of initial tightening, loosing torque (detorque) was measured using a digital torque wrench. Data were analyzed using Shapiro-Wilk, Wilcoxon, and Kruskal-Wallis tests, at 5% level of significance. RESULTS: In the CG and ASMT groups, detorque was lower than the insertion torque (24.6 ± 1.5 N.cm and 24.3 ± 1.1 N.cm, respectively). In the ASHT and CYAB groups, mean detorque increased in comparison to the insertion torque (51.0 ± 7.4 N.cm and 47.7 ± 15.1 N.cm, respectively). CONCLUSION: The ASHT was more efficient than the other sealing agents, increasing the remaining preload (detorque value) 58.88%. Although the cyanoacrylate-based bonding agent also generated high detorque values, the high standard deviation suggested its lower reliability.


Asunto(s)
Tornillos Óseos , Prótesis Dental de Soporte Implantado , Análisis del Estrés Dental , Aleaciones de Cromo , Pilares Dentales , Diseño de Implante Dental-Pilar , Implantes Dentales , Humanos , Ensayo de Materiales , Reproducibilidad de los Resultados , Estrés Mecánico , Titanio , Torque
16.
Braz. j. oral sci ; 17: e18127, 2018. tab
Artículo en Inglés | LILACS, BBO - Odontología | ID: biblio-963817

RESUMEN

Aim: The aim of this study was to verify the microshear bond strength of conventional and self-adhesive resin cements to feldsphatic ceramic. Methods: Twenty discs of Starlight ceramic (Degudent) were made (15mm x 2mm). The bonding procedure was accomplished by insertion of resin cements into tubes of 0.7mm internal diameter in contact with the ceramic. The resin cements used were: RelyX ARC (3M Espe), Panavia F (Kuraray), RelyX Unicem (3M Espe) and seT (SDI). Total of six tubes of each material on each ceramic disc. The specimens were tested for microshear in a universal testing machine, 24hours and 6months after bonding procedure. Values of microshear bonding strength (MPa) were subjected to ANOVA and Fisher PLSD test (p<0.05). Results: For 24hours analysis, RelyX ARC showed the highest microshear bonding strength without statistical difference to RelyX Unicem and seT. Panavia F showed the lowest values of microshear bonding strength in both periods. In the analysis after 6months there was a significant increase in the microshear bonding strength values for all cements compared to 24hours. Only for RelyX ARC, the increase was not statistically significant. Conclusion: In conclusion, the bond strength depends mainly on the type of resin cement used, and the self-adhesive cements behave similarly to conventional resin cement


Asunto(s)
Cerámica , Recubrimientos Dentinarios , Cementos de Resina , Resistencia al Corte
17.
Int J Oral Maxillofac Implants ; 32(5): 1132­1134, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-28170451

RESUMEN

The aim of this article is to describe the procedure for sealing the screw access channel using plastic tape, polytetrafluoroethylene, in screw- or cement-retained implant-supported prostheses. This technique is viable and easily performed, and the functional and esthetic results are satisfactory.

18.
J Clin Diagn Res ; 10(5): ZC84-7, 2016 May.
Artículo en Inglés | MEDLINE | ID: mdl-27437367

RESUMEN

INTRODUCTION: The use of removable partial denture (RPD) is considered as low-cost and common treatment option to rehabilitate edentulous areas. AIM: This study aimed to investigate the epidemiological data of patients rehabilitated with removable partial denture (RPD) in order to assess treatment survival rate and failures. MATERIALS AND METHODS: Epidemiological data and medical records of patients treated with RPD between 2007 and 2012 at the RPD discipline of a Brazilian University (Aracatuba Dental School- UNESP) were evaluated as well as dental records of patients who underwent RPD treatments (fabrication or repairs) between 2000 and 2010. Factors such as gender, age, presence of systemic disease, main complaint, edentulous arch, period and cause of denture replacement and the prosthesis characteristics were recorded. The chi-square test was used to assess the differences between the variables and the Kaplan Meyer to assess the survival of the RPDs evaluated. RESULTS: A total of 324 maxillary RPD and 432 mandibular RPD were fabricated. Most of the patients were women aging 41 to 60-year-old. The number of mandibular RPD Kennedy class I (26%) was statistically higher for the maxillary arch (p<.05). There was no association between main complaint to gender or the presence of systemic disease. The lingual plate was the most common major connector used in the mandible (32%). The main reason for altering the design of replaced RPDs were changes during treatment plan. CONCLUSION: The number of patients who require RPD is large; most of RPDs are Kennedy Class I. A good treatment plan is very important for achieving a positive treatment outcome, and it is strictly related to the survival rate.

19.
Braz. j. oral sci ; 14(4): 306-310, Oct.-Dec. 2015. ilus, tab
Artículo en Inglés | LILACS, BBO - Odontología | ID: lil-797253

RESUMEN

Aim: To compare the alveolar bone repair process using biomaterial in dogs with and without the incorporation of platelet-rich plasma. Methods: Six beagles were used. Bilateral extractions of the three mandibular premolars were performed. Bio-Gen® was applied in the first alveolus, the clotwas maintained in the second alveolus and Genox® was applied to the third alveolus. PRP wasadded to all alveoli on the left side only. The dogs were submitted to euthanasia after 30, 60 and90 days and submitted to histological analysis for the determination of mean area of new boneformation. Tukey’s post test was used in the statistical analysis. Results: Significant increase inbone formation occurred in Bio-Gen® + PRP when compared with the other groups at 30 and 90days. In the evaluation at 60 days, no statistically significant differences among the groups were found. Conclusions: The Bio-Gen® biomaterial led to the best bone repair and the combinationof platelet-rich plasma accelerated the repair process.


Asunto(s)
Animales , Perros , Materiales Biocompatibles , Regeneración Ósea , Plasma Rico en Plaquetas
20.
J Prosthet Dent ; 113(6): 628-35, 2015 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-25858222

RESUMEN

STATEMENT OF PROBLEM: The color stability and staining of acrylic resin denture teeth remains an esthetic problem for complete denture wearers. PURPOSE: The purpose of this study was to evaluate the long-term clinical color stability and stainability of acrylic resin denture teeth in complete denture wearers over a period of 5 years. MATERIAL AND METHODS: Fifty participants rehabilitated with complete dentures from February 2008 to December 2013 were selected. The demographic data and the clinical characteristics of participants were recorded. Color change (ΔE) in 3 regions of the denture teeth (incisal, middle, and cervical) was evaluated by spectrophotometry in the CIE L*a*b* system. Participants were asked whether they had noticed any changes in the coloring of the teeth in their dentures. Hierarchical clustering analysis was used to identify groups formed from variables related to demographic questions and color analysis. Two-way ANOVA among the color cluster groups was performed and the Tukey-Kramer test was used as a post hoc test (α=.05). A chi-square test and Fisher exact test were used to identify the association between the study variables and color changes in the participants' responses (α=.05). RESULTS: Four cluster groups from 50 participants were identified in the clustering analysis. The ΔE was statistically significant for the interaction between the dental third and cluster groups (P<.001). Cluster groups 1 and 4 exhibited statistically higher ΔE values than cluster groups 2 and 3 (P<.05). Greater chromatic alterations were noted in the incisal third of the teeth than in the cervical and medium thirds in the cluster groups 1 (ΔE=11.03 ±1.22) and 3 (ΔE=4.14 ±1.14) (P<.05). No relationship was found with the participants' personal opinions about color change (P>.05). CONCLUSION: Although the acrylic resin denture teeth exhibited color instability and staining in vivo, the participants were unable to identify the color change. The cluster groups with higher color change values consumed more staining solutions.


Asunto(s)
Resinas Acrílicas/química , Materiales Dentales/química , Dentadura Completa , Diente Artificial , Adulto , Anciano , Anciano de 80 o más Años , Color , Percepción de Color , Estudios Transversales , Estética Dental , Femenino , Estudios de Seguimiento , Humanos , Estudios Longitudinales , Masculino , Metacrilatos/química , Persona de Mediana Edad , Polimetil Metacrilato/química , Espectrofotometría/métodos , Propiedades de Superficie
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