Análise da interface dente-restauração por meio de escâner tridimensional em restaurações com compósito à base de silorano / Marginal integrity analysis through three-dimensional scanner in silorane-based composites

RESUMO

Este artigo avalia o desempenho do compósito restaurador à base de silorano na interface de restaurações adesivas. Cavidades cilíndricas classe I (Ø=5,0mm e h=2,0mm) (fator-C=2,6) foram preparadas em dez molares humanos. Os compósitos avaliados foram Fitek P60 (P) e Filtek LS (LS). As cavidades foram restauradas em incremento único com P e LS, utilizando-se o protocolo de fotoativação convencional 850mW/cm2/25s. As restaurações foram seccionadas e analisadas em escâner tridimensional, e os danos foram submetidos ao tratamento estatístico. Foi detectada diferença entre os grupos estudados – PxLS (α=0,001). Verificou-se presença de fendas marginais na região dos ângulos internos de todos os corpos de prova em que foi utilizado P, e somente 20% quando foi utilizado LS. Conclui-se que LS produziu formação reduzida de fendas em comparação com P.

ABSTRACT

To evaluate silorane-bases restorative composite performance on marginal integrity of adhesive restorations interface. Cylindrical class I cavities (Ø=5.0mm and h=2.0mm) (C-factor=2.6) were prepared using ten human molars with a diamond bur # 4054. Two minifilled hybrid composites with different type of organic matrixes were evaluated methacrylate-based [Fitek P60 (P)] and silorane-based [Filtek LS (LS)]. The cavities were restored in bulk with P and LS using the light-curing mode Standard - 850mW/cm2/25s (±21 J/cm2). After storage, finishing and polishing, the restorations were cut into two slices and analyzed in three-dimensional scanner. Data obtained were submitted to Kruskal-Wallis non-parametric test (α=0.01). It was detected significant statistical difference between studies groups – PxLS (α=0.001).It was verified the presence on internal angles region of all specimens in which were restored with P of gap formation and only 20% in which were restored with LS. It was possible to conclude LS produced lower gap formation in comparison with P.