A clinical evaluation of direct veneers made with two types of composites

Objectives: the aim of this study was to provide a retrospective clinical evaluation of direct composite veneers performed with microfilled or universal composites, through two evaluation criteria (FDI and USPHS). Materials and methods: patients should be in compliance with the inclusion criteria: having a composite veneer in anterior teeth made either with microfilled or universal using composites (microhybrid/nanohybrid), conventional dentin-bonding agents and for a minimum of 6 months period in service. A calibrated blind examiner assessed the veneers using the FDI and USPHS criteria and the results were subjected to statistical analysis by the Mann-Whitney test (p<0.05). Results: Twenty-eight patients (mean age 42.9 year-old) and seventy-four composite veneers were examined. The mean period of time in service was three years, with periods varying from six months up to ten years. Three cases of total failure (veneers lost, universal composites group) occurred in the surveyed patients, out of 17 failures in total. In general, the veneers showed a clinical satisfactory outcome (77% survival rate). Concerning the two composite types, better clinical performance was observed for microfilled in relation to surface luster, surface staining, colour match and marginal adaptation. Conclusion: In this interim evaluation, direct composite veneers demonstrated an acceptable clinical behavior. Microfilled composite veneers showed a better performance compared to universal composites. The two criteria (USPHS and FDI) were similar in the clinical evaluation process. Clinical relevance: direct composite veneers have a good clinical performance, microfilled composites are interesting options regarding esthetic properties.

Influence of filling technique and bevel preparation on marginal sealing of conventional and low shrinkage composite restorations

AIM: The aim of this study was to evaluate two composite restorations (conventional methacrylate-based and low shrinkage-based silorane), associated or not to beveling and incremental technique, in relation to the microleakage and marginal gap formation tests. MATERIAL AND METHODS: 30 sound human molars had their mesial and distal surfaces prepared with and without bevel. The teeth were divided into six groups according to the type of resin (conventional nanofilled or silorane resin), and restorative filling technique (incremental technique or builk). Microleakage and marginal gap formation data were statistically analyzed by Kruskal-Wallis and Chi-Square tests, with a significance level set at 5%. RESULTS: Group 1 (Z350 XT, without bevel, incremental technique) presented highest rate of microleakage and marginal gap in most of the restorations, with statistically significant differences. Groups 4 and 6 (P90, beveled, builk and P90, beveled and incremental technique) had lower rates of microleakage and absence of marginal gaps in most of the restorations. CONCLUSION: It's concluded that the silorane showed lower rates of marginal gaps and microleakage, when compared to the conventional methacrylate-based resin. Bevel preparation was effective in reducing microleakage and marginal gaps for both resins used. Incremental technique was not necessary when associated with low shrinkage composite resin.

Avaliação clínica retrospectiva de restaurações proximais de resina composta de classes III e IV / Retrospective clinical evaluation of proximal composite resin restorations (class III and IV)

A resina composta é frequentemente utilizada na saú- de pública, sendo um dos principais materiais usados na atenção primária. Um estudo de avaliação retrospectiva reflete uma real situação dos procedimentos restauradores. Objetivo: Realizar uma avaliação clínica retrospectiva de restaurações diretas proximais de resinas compostas em dentes anteriores (classes III e IV) realizadas na Faculdade de Odontologia da Universidade Federal do Rio Grande do Sul. Métodos: De acordo com os critérios de inclusão e exclusão, dois métodos de avaliação foram utilizados por um examinador calibrado e cego, o USPHS e o FDI modificados. Resultados: Foram avaliadas 79 restaurações, feitas de há 6 meses até há 20 anos. As restaurações proximais foram divididas em dois grupos, classe III (n = 33) e classe IV (n = 46). Na classe III, oito delas foram classificadas como clinicamente insatisfatórias em pelo menos um dos métodos de avaliação clínica (24%). Já na classe IV, nove delas se apresentaram como insuficientes (20%). As maiores causas de falha para a classe III foram: manchamento marginal (12%) e adaptação marginal (12%) pelo FDI, integridade marginal (9%) e cárie secundária (9%) pelo USPHS; e para classe IV: fraturas e retenção (11%) pelo FDI, forma anatômica (9%) e fraturas e retenção (9%) pelo USPHS. Conclusão: Restaurações de resina composta demonstraram um desempenho clínico satisfatório ao longo do tempo, apresentando uma baixa taxa de falha no período avaliado. Os dois métodos (USPHS e FDI) se mostraram eficazes no processo de avaliação clínica...