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Study on Restorative and Preventive Methods of Root Surface Caries in vitro.

根面龋的体外修复及预防方法研究。

基本信息

批准号：
02670859
负责人：
TERANAKA Toshio
金额：
$ 1.09万
依托单位：
Kanagawa Dental College
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

In this study the most appropriate methods for evaluating the dentin adhesive agent, improving the marginal closure, and preventing root caries were examined.The results obtained were as follows :1. An accurate, reproducible, and durable adhesive fatigue testing machine was constructed. Four brands of dentine adhesives were evaluated using this machine. The static shear bond strengths of three brands were similar, but the dynamic fatigue shear bond strengths were significantly different from each other, and Liner Bond<@D1(]SY.encircledR.[)@>D1 showed the highest static shear bond strength with no fatigue decline.2. To improve the marginal closure of light-curing resin composite restoration, the three components inclined incremental technique was evaluated. Better marginal closure of resin composite was obtained when the incremental technique was used and the water immersion period was extended.3. To prevent the secondary caries of cast restoration, the APF-lanthanum treatment was applied onto the dentinal cavity walls before cementation. The APF-lanthanum treatment (APF-La Tx) is effective as a pretreatment of the cavity to prevent acid penetration and to preserve the dentin structure.4. To indicate the effectiveness of APF-La Tx onto the dentin surface against demineralization in vitro, a scanning electron microscopic study was performed. Before demineralization, APF-La treated dentin surface was completely covered with a 0.5-1.0 mum thick layer of minute spherical compounds, and these compounds still remained and covered the surface even after demineralization. Dentinal tubules were closed by dentinal plugs. APF-La Tx group showed a shallower lesion formation than the control and APF groups. The APF-La Tx was outstanding with a well preserved surface structure resistant against subsequent acid attack.

本研究旨在探讨评价牙本质粘接剂的最佳方法，以提高边缘封闭性，预防根面龋。建立了一种精确、可重复、耐用的胶粘剂疲劳试验机。四个品牌的牙本质粘合剂使用该机器进行了评价。三个品牌的静态剪切粘结强度相似，但动态疲劳剪切粘结强度彼此差异显著，Liner Bond<@D1（] SY. encircledR。[）@>D1表现出最高的静态剪切粘结强度，且没有疲劳下降.为提高光固化树脂复合体修复体的边缘封闭性，对三分量倾斜增量技术进行评价。采用增量法和延长浸水时间，可获得较好的树脂复合材料边缘封闭性.为预防铸造修复体的继发龋，在粘结前对牙本质洞壁进行APF-镧处理。APF-La Tx是一种有效的牙洞预处理方法，可有效防止酸的渗透，保护牙本质结构.为了表明APF-La Tx在体外牙本质表面抗脱矿的有效性，进行了扫描电子显微镜研究。在脱矿之前，APF-La处理的牙本质表面完全覆盖有0.5-1.0 μ m厚的微小球形化合物层，并且这些化合物即使在脱矿之后仍然保留并覆盖表面。牙本质小管被牙本质塞封闭。APF-La Tx组的病变形成较对照组和APF组浅。该APF-La Tx是杰出的，具有良好的表面结构，可抵抗随后的酸侵蚀。