Kaneko Marina, Caldas Ricardo Armini, Feitosa Victor Pinheiro, Xediek Consani Rafael Leonardo, Schneider Luis Felipe J, Bacchi Ataís
Departments of Prosthodontics and Periodontics, Restorative Dentistry, Campinas State University, Campinas, São Paulo, Brazil.
Department of Restorative Dentistry, Veiga de Almeida University, Rio de Janeiro, Brazil.
J Conserv Dent. 2015 May-Jun;18(3):242-6. doi: 10.4103/0972-0707.157265.
The aim of this study was to evaluate the tensile bond strength (TBS) of repairs in recent fillings of methacrylate- (MBC) or silorane-based composites (SBC) subsequent to different surface treatments.
Fifty slabs of Filtek P60 (3M ESPE, St Paul, USA) and Filtek P90 (3M ESPE) were stored for 10 days in distilled water at 37°C. The surface of adhesion was abraded with a 600-grit silicone paper and repaired using each respective composite: G1, no treatment (control); G2, application of adhesive; G3, application of silane and adhesive; G4, sandblasting (Al2O3) and adhesive; and G5, sandblasting (Al2O3), silane, and adhesive. Further 10 slabs of each composite were also evaluated for cohesive strength (G6). After 30 days immersion in distilled water at 37°C, the TBS was determined.
TBS results were higher for MBC than for SBC (P = 0.00012). The experimental groups were similar for SBC and the TBS was 27% of its cohesive strength. For P60, sandblasting significantly improved the TBS compared to other groups. With MBC, G4 and G5, the TBS was approximately 47% of its cohesive strength.
Sandblasting (Al2O3) improves the repair-strength of MBC, whilst for the SBC all treatments succeed. MBC presents higher repair strength than SBC.
本研究旨在评估在不同表面处理后，甲基丙烯酸酯基复合材料（MBC）或硅烷类复合材料（SBC）近期填充物修复处的拉伸粘结强度（TBS）。
将50块Filtek P60（美国明尼苏达州圣保罗市3M ESPE公司）和Filtek P90（3M ESPE）板在37°C的蒸馏水中储存10天。用600目砂纸打磨粘结表面，并用各自的复合材料进行修复：G1组，不处理（对照）；G2组，施加粘结剂；G3组，施加硅烷和粘结剂；G4组，喷砂（Al2O3）和粘结剂；G5组，喷砂（Al2O3）、硅烷和粘结剂。还对每种复合材料的另外10块板评估其内聚强度（G6）。在37°C的蒸馏水中浸泡30天后，测定TBS。
MBC的TBS结果高于SBC（P = 0.00012）。SBC的各实验组相似，TBS为其内聚强度的27%。对于P60，与其他组相比，喷砂显著提高了TBS。对于MBC，G4组和G5组的TBS约为其内聚强度的47%。
喷砂（Al2O3）可提高MBC的修复强度，而对于SBC，所有处理方法均有效。MBC的修复强度高于SBC。
