酸蚀牙面后黏结树脂嵌体修复牙体的抗力性能

背景：树脂嵌体修复牙体缺损在一定程度上可减少修复后牙齿的折裂，但嵌体经不同方法黏结处理后对牙体抗力的影响未见报道。目的：了解复合树脂经不同方法处理后修复牙体的抗力特性。方法：将40颗无龋人前磨牙制作近中-牙合面-远中洞型洞，随机分成4组：其中一组备洞后未进行修复作为对照组，其他3组分别以可乐丽菲露光固化复合树脂直接充填，可乐丽菲露光固化复合树脂嵌体直接黏结和酸蚀黏结修复。结果与结论：①力学模型静态力学加载实验结果：树脂直接充填组、树脂嵌体直接黏结和酸蚀黏结组断裂载荷均高于对照组(P < 0.05)，前3组断裂载荷比较组间差异无显著性意义(P > 0.05)，树脂嵌体酸蚀黏结组断裂载荷最大。②扫描电镜观察结果：树脂直接充填组断裂位于牙本质层和树脂之间，几乎无树脂残留，有较多孔隙；树脂嵌体直接黏结组大量牙本质基体与树脂间断裂，有较少树脂残留；树脂嵌体酸蚀黏结组牙与树脂之间无气泡、无缝隙、相互嵌合、紧密接触；对照组，树脂直接充填、直接黏结、酸蚀黏结组分别出现10，5，3，1个样本树脂内聚破坏断裂。表明经酸蚀处理复合树脂嵌体可提高牙体力学性能。

Dental resistance of resin inlays with etched enamel bonding

BACKGROUND:Composite inlays for repairing dental defects can reduce tooth fracture in a certain extent. But there is no report about the effect of inlays with different bonding treatments on fracture resistance of teeth.OBJECTIVE:To understand the fracture resistance of repaired teeth after compound resin treated with different methods.METHODS:Forty caries-free human premolars were collected for making medial-occlusal-distalholes. They were randomly divided into four groups: group 1 as control group (without repair after holes formed); group 2(filled with coke beautiful Philippine light curing composite resin inlay), group 3 (direct bonding with coke beautiful Philippine light curing composite resin inlay )and group 4 (etching bonding repaired by coke beautiful Philippine light curing composite resin inlay).RESULTS AND CONCLUSION:①The mechanical model of static loading experimental results: fracture load of the 2, 3 and 4 groups was higher than that of the control group (P < 0.05). There was no significant difference among the 2, 3 and 4 groups (P > 0.05), and the fracture load of group 4 was the maximal. ②The scanning electron microscope results: the fracture in group 2 located in between the dentin layer and resin, besides, there was almost no resin residue but a lot of pores. In group 3, a large number of dentin fractured with resin matrix, in addition, there was less resin residue. There were no bubbles and gaps between tooth and resin in the group 4, besides, fitted to each other and in close contact; 10, 5, 3 and 1 samples of resin cohesive fracture were found in the 1, 2, 3 and 4 groups, respectively. These findings suggest that the composite resin inlays treated with acid etching on posterior teeth surface can increase dental resistance.