Silorane-based composite as repair material: a six-month randomized clinical trial

Objective: This study investigated the clinical performance of a silorane-based composite resin when used for repairing conventional composite restorations. Methods: Defective dimethacrylate-based composite resin restorations were randomly assigned to one of two treatment groups: Control group - Adper SE Plus + Filtek P60 (3M/ESPE, St. Paul, EUA) and Test Group - P90 Adhesive System + Filtek P90 (3M/ESPE, St. Paul, EUA). All repaired restorations were evaluated at baseline, and at six-month recall. The parameters examined were marginal adaptation, anatomic form, surface roughness, marginal discoloration, post-operative sensitivity and secondary caries. The restorations were classified according to modified USPHS criteria. Mann-Whitney and Wilcoxon tests were used to compare the groups. Results: Of the 100 restorations repaired in this study, 93 were reexamined at baseline and 91 at 6-month recall. Drop-out was about 9%. No statistically significant differences were found between the materials for all clinical criteria, at baseline and at 6-month recall (p > 0.05). No statistically significant differences were registered (p > 0.05) for each material when compared for all clinical criteria, at baseline and at 6-month recall. The hypothesis tested in this randomized controlled clinical trial was accepted. Conclusion: After the six-month evaluations, silorane-based composite exhibit a similar performance compared to dimethacrylate-based composite when used as repair material. Objetivo: Investigar o desempenho clinico de uma resina de baixa contracao a base de silorano quando utilizada para reparar restauracoes convencionais de resina composta. Metodos: Restauracoes defeituosas de resina composta a base de dimetacrilato foram aleatoriamente reparadas por um de dois grupos de tratamento: Grupo Controle - Adper SE Plus + Filtek P60 (3M/ESPE, St. Paul, EUA) e Grupo Teste - Sistema adesivo P90 + Filtek P90 (3M/ESPE, St. Paul, EUA). Todas as restauracoes reparadas foram avaliadas em baseline e ao longo de 6 meses. Os parâmetros analisados foram a adaptacao marginal, forma anatomica, rugosidade superficial, descoloracao marginal, sensibilidade pos-operatoria e lesoes de carie. As restauracoes foram classificadas de acordo com os criterios do Servico de Saude Publico dos Estados Unidos modificados. Os testes de Mann-Whitney e Wilcoxon foram utilizados para comparar os grupos. Resultados: Das 100 restauracoes reparadas neste estudo, 93 foram examinadas uma semana apos terem sido reparadas - baseline e 91 apos 6 meses. A perda foi de aproximadamente 9%. Nenhuma diferenca estatisticamente significativa foi encontrada entre os materiais para todos os criterios clinicos, em baseline e ao longo de 6 meses (p> 0,05). Conclusao: A hipotese testada neste ensaio clinico controlado randomizado foi aceita. Apos 6 meses de avaliacoes, resinas compostas a base de silorano apresentaram desempenho clinico semelhante as resinas compostas a base de dimetacrilato quando utilizadas para reparar restauracoes de resina composta a base de dimetacrilato.