Studies on Marginal Fracture and Marginal Leakage Around Direct Composite Resin Inlay Restorations.

直接复合树脂嵌体修复周围边缘断裂和边缘渗漏的研究。

• 批准号: 02454437
• 负责人: INOUE Kiyoshi
• 金额: $ 4.42万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02454437/
• 关键词: Indirect composite resin inlay; Marginal fracture; Marginal leakage; コンポジットレジンインレ-; 窩縁形態

The purpose of the present study was to investigate the marginal fracture of composite inlay with each of three marginal forms-butt joint, straight bevel and round bevel, under simulated occlusal force and to estimate their clinical performance.Six class 1 cavities with each marginal form were prepared on the surfaces of extracted incisors. Indirect composite inlay was inserted into the cavity with a dual-cured resin cement. Half of the restored teeth was subjected to 5000 thermocyclings between 4 and 60ﾟC and the other half was stored in water. After all teeth were subjected to the load cycling test designed for a stainless rod (weight : lkg) to fall repeatedly from the height of 1.5cm at 125 times/min, they were immersed in fuchsin solution for 24 hours. Degree of marginal fracture and leakage were observed. The teeth restored by direct composite filling technique were also tested as control. In clinic, carious molar teeth were restored with composite inlay with each marginal form. Clinical-estimation was performed at 0, 3 and 6 months later, using a USPHS criteria. The marginal integrity of the restorations was also observed by SEM.Results were as follows ;1. The frequency of marginal fracture of indirect composite inlay was lower than that of direct composite restorations. However it was increased by thermocycling, while in direct composite restoration there was no effect of thermocycling.2. In indirect composite inlay without thermocycling, the order of the frequency of fracture was straight bevel>round bevel>butt joint.3. The order of the degree of marginal leakage around both restorations after thermocycling was butt joint>round bevel>straight bevel.4. Marginal leakage around indirect composite inlay was remarkably increased by thermocycling.5. In clinical estimation, no marginal fracture around composite inlay was observed at the period of 6 months.

本研究的目的是在模拟咬合力的情况下，观察对接、直斜面和圆斜面三种边缘形态的复合嵌体的边缘折断情况，并对其临床表现进行评估。间接复合嵌体用双固化树脂粘固剂插入洞内。其中一半的修复牙齿在4到60ﾟC之间进行5,000次热循环，另一半保存在水中。所有牙齿以125次/min的速度从1.5 cm高的高度反复下落，在品红溶液中浸泡24小时后，进行载荷循环试验。观察骨折边缘及渗漏的程度。用直接复合体充填技术修复的牙齿作为对照。临床上采用各种边缘形态的复合嵌体修复磨牙龋齿。根据USPHS标准在0、3和6个月后进行临床评估。结果如下：1.间接复合嵌体的边缘折裂发生率低于直接复合修复。结果：1.热循环修复后牙周组织的粘接强度增加，而直接修复后的修复效果不明显。未经热循环的间接复合嵌体的断裂频率大小顺序为直角、圆角、对接。热循环后两种修复体边缘渗漏程度大小顺序为对接、圆斜面、直斜面。热循环后间接复合嵌体边缘渗漏明显增加。在临床评估中，6个月内没有观察到复合嵌体周围的边缘骨折。