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.

本研究探讨了评估牙本质粘合剂、改善边缘闭合和预防根龋的最合适方法。获得的结果如下： 1．建造了一台精确、可重复且耐用的粘合疲劳试验机。使用该机器评估了四个品牌的牙本质粘合剂。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存在显着差异，且Liner Bond<@D1(]SY.encircledR.[)@>D1表现出最高的静态剪切粘结强度，无疲劳下降。2．为了提高光固化树脂复合修复体的边缘封闭性，对三组分倾斜增量技术进行了评价。采用增量技术并延长水浸时间，树脂复合材料的边缘封闭性较好。 3．为了防止铸造修复体的继发龋，在粘接前对牙本质腔壁进行APF-镧处理。 APF-镧处理(APF-La Tx)作为蛀牙的预处理是有效的，可以防止酸渗透并保留牙本质结构。4．为了表明 APF-La Tx 在牙本质表面上对抗体外脱矿的有效性，进行了扫描电子显微镜研究。脱矿前，APF-La处理过的牙本质表面完全覆盖有一层0.5-1.0μm厚的微小球形化合物，即使脱矿后，这些化合物仍然残留并覆盖在表面。牙本质小管由牙本质塞封闭。 APF-La Tx 组显示出比对照组和 APF 组更浅的病变形成。 APF-La Tx 非常出色，其表面结构保存完好，可抵抗随后的酸侵蚀。