两种不同固化处理的复合树脂黏接微拉伸强度测试研究

Microtensile bond strength of two different cured resin composites

目的 对不同固化处理的复合树脂黏接微拉伸强度进行测试。方法 新鲜拔除的完好无龋、人下颌第三磨牙15颗,随机分成3组,用Isomet低速切割机流水冲洗下磨去咬合面釉质,暴露牙本质,用Renew树脂直接充填、Renew树脂间接修复、Tescera树脂间接修复制作树脂“冠”并黏接在牙本质面上,贮存于室温水中2 4h ,测试微拉伸强度。结果 Renew树脂直接充填组(33.38±6 .2 4 )MPa的微拉伸强度高于Renew间接修复组(2 0 .0 6±4 .96 )MPa和Tescera间接修复组(2 0 .87±4 .6 2 )MPa ,差异有显著性(P <0 .0 5 ) ,后两者之间差异无显著性。结论 树脂直接充填的微拉伸强度要高于树脂间接修复。

Objective To evaluate the microtensile bond strength(MTBS) of different cured resin composite. Methods Superficial occlusal dentin of 15 freshly extracted caries-and restoration-free human mandibular third molars was exposed, finished with Isomet Low Speed Saw under copious water spray, and a crown of different cured resin composite bonded with the adhesives according to the manufacture's instructions. The teeth were stored in water at room temperature for 24 h, and sectioned both mesial-distally and buccal-lingually along their long axis into 1.0 mm×1.0 mm sticks that were tested in tensile mode. Results Although no significant difference was found in the indirect composite Renew(20.06±4.96) MPa and Tescera(20.87±4.62) MPa, the direct composite Renew(33.38±6.24) MPa resulted in statistically higher bond strength than the two indirect composites (P<0.05). Conclusion The microtensile bond strength of direct composite is higher than that of indirect composite.