de Silva André Luís Faria, Lima Débora Alves Nunes Leite, de Souza Grace Mendonça Dias, dos Santos Carlos Tadeu Dias, Paulillo Luís Alexandre Maffei Sartini
Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas, Piracicaba, São Paulo, Brazil.
Oper Dent. 2006 Sep-Oct;31(5):562-8. doi: 10.2341/05-98.
This study evaluated microtensile bond strength (pTBS) when an additional adhesive layer was applied to the dentin surface. Thirty-five human third molars were flattened to expose the occlusal dentin surface. The teeth were randomly assigned to 7 experimental groups: G1-Single Bond (SB); G2-additional layer of SB; G3--a layer of Scotchbond Multi-purpose (SMP) adhesive applied over SB; G4-Clearfil SE Bond (CE); G5-additional layer of CE; G6-Adper Prompt (AP) and G7-additional layer of AP. For the G2, G3, G5 and G7 groups, the first adhesive layer was light-cured before application of the additional layer. After bonding procedures, 5-mm high composite crowns were incrementally built up. The samples were sectioned to obtain 0.9 x 0.9 beams, which were tested under tension at a crosshead speed of 0.5-mm/minute until failure. The failure mode and adhesive thickness were evaluated under SEM. The pTBS data were analyzed by 1-way ANOVA and post-hoc Ducan's Test (a=0.05). Mean adhesive thickness was analyzed by 1-way ANOVA and post-hoc Tukey's test (a=0.05). The results indicated that G3 presented the highest microTBS and the thickest adhesive layer. G6 and G7 presented the lowest microTBS values. When solvent-free adhesives systems were used, microTBS values were not affected by the thicker layer.
本研究评估了在牙本质表面施加额外粘结剂层时的微拉伸粘结强度（pTBS）。将35颗人类第三磨牙磨平以暴露咬合面牙本质表面。这些牙齿被随机分为7个实验组：G1-单组分粘结剂（SB）；G2-SB额外层；G3-在SB上涂抹一层Scotchbond多功能粘结剂（SMP）；G4- Clearfil SE粘结剂（CE）；G5-CE额外层；G6-Adper Prompt粘结剂（AP）和G7-AP额外层。对于G2、G3、G5和G7组，在施加额外层之前先对第一层粘结剂进行光固化。粘结程序完成后，逐步堆塑5毫米高的复合树脂全冠。将样本切片以获得0.9×0.9的梁，以0.5毫米/分钟的十字头速度在拉伸状态下进行测试直至破坏。在扫描电子显微镜下评估破坏模式和粘结剂厚度。pTBS数据采用单向方差分析和事后邓肯检验（α=0.05）进行分析。平均粘结剂厚度采用单向方差分析和事后Tukey检验（α=0.05）进行分析。结果表明，G3组呈现出最高的微拉伸粘结强度和最厚的粘结剂层。G6和G7组呈现出最低的微拉伸粘结强度值。当使用无溶剂粘结剂系统时，微拉伸粘结强度值不受较厚粘结剂层的影响。
