Influence of the mineral content and morphological pattern of artificial root caries lesion on composite resin bond strength
Influence of the mineral content and morphological pattern of artificial root caries lesion on composite resin bond strength
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DOI：
10.1111/j.0909-8836.2004.00093.x
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发表时间：
2004-02-01
影响因子：
1.9
通讯作者：
Serra, MC
中科院分区：
文献类型：
--
作者：
Hara, AT;Queiroz, CS;Serra, MC
通过将牙根片置于人工唾液中(对照组)，(B)脱矿32h诱发龋损(脱矿组)，(C)脱矿32h后再矿化8d，形成不同矿物质含量和形态的牙本质基质。对板材进行纵切，用横截面显微硬度测定矿物质含量，用微拉伸粘接强度试验评价粘接系统/复合树脂的粘接强度。用扫描电子显微镜观察处理后牙本质的形态以及脱粘试件的破坏形态。在矿物质含量方面发现了显著的统计学差异。形态分析表明，脱矿和再矿化底物的形态有显著差异。对照A组的粘结强度平均值与B组无显著差异，但显著高于C组。由于牙本质矿物质含量与粘结强度之间没有线性关系，提示形态结构可能比矿物质含量更能解释复合树脂与牙本质的粘结强度。
Dentine substrates with different mineral contents and morphological patterns were created by submitting root slabs to the following treatments: (A) immersion in artificial saliva during the experimental period (control), (B) demineralization for 32 h to induce caries lesion (demineralized group), and (C) demineralization for 32 h followed by remineralization for 8 d (remineralized group). The slabs were longitudinally sectioned, the mineral content was determined by cross-sectional microhardness, and the bond strength of an adhesive system/composite resin was assessed using a microtensile bond strength test. The dentine morphology after the treatments as well as the failure pattern of the debonded specimens was examined by scanning electron microscopy. Statistically significant differences were found in mineral content. Morphological analysis showed marked differences between the patterns of demineralized and remineralized substrates. The bond strength mean value of the control A did not differ from the group B, but was statistically higher than the group C. Since no linear relationship was found between dentine mineral content and bond strength values, it could be suggested that the morphological pattern may be more relevant than the mineral content to explain the bond strength of composite resin to dentine.