| 朱亚萍,郭建青,傅柏平.前磨牙楔状缺损修复后的抗折裂强度研究[J].口腔材料器械杂志,2012,21(4):191-194. |
| 前磨牙楔状缺损修复后的抗折裂强度研究 |
| Study on the fracture-resistant forces of premolars with wedge- shaped defects post restoration |
| 投稿时间：2012-04-17 修订日期：2012-05-02 |
| DOI：10.11752/j.kqcl.2012.04.05 |
| 中文关键词: 楔状缺损 前磨牙 抗折裂能力 复合树脂 复合体 玻璃离子水门汀 |
| 英文关键词:Wedge-shaped defect Premolar Fracture-resistant force Composite resin Compomer Glass ionomer cement |
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| 中文摘要: |
| 目的：研究楔状缺损深及牙齿颊舌径的1/4或1/2的前磨牙采用不同材料充填后牙体的抗折裂强度及牙齿折裂模式。方法：收集正畸拔除的新鲜前磨牙60颗,颊侧颈部设计颊舌径1/2和1/4楔状缺损,对1/2深度根管治疗后分别选择复合树脂、复合体或玻璃离子水门汀三种材料充填,运用万能材料试验机对前磨牙颊尖垂直向载力直至牙体断裂。记录牙断裂时的受力数值,并观察断裂模式。结果：不同深度的楔状缺损其抗折裂强度不同,但各组间差异无统计学意义(P>0.05)。充填后前磨牙抗折裂强度显著增加(P<0.01),而不同充填材料对牙齿抗折裂强度无显著差异(P>0.05)。结论：楔状缺损深及前磨牙颊舌径的1/4以上时容易导致前磨牙折裂。材料充填后可以提高前磨牙的抗折裂能力且与充填材料的种类无关。 |
| 英文摘要: |
| Objective: The aim of this study was to examine the fracture-resistant forces and the modes of fracture when premolars had wedge-shaped defects with different depths and the wedge-shaped defects were restored with different restorative materials. Methods: Sixty human Premolars extracted for orthodontic reasons were used. After wedge-shaped defects at the buccal cervix had been prepared into 1/2 or 1/4 bucco-lingual distance of the premolars,ten premolars per group were restored with one of three restorative materials (composite resin,compomer and glass ionomer cement) or without any filling materials. Vertical compress forces on the buccal cusps of the premolars were recorded until fracture. Results: No statistical significant differences of fracture- resistant forces were found between the depths (1/2; 1/4) of wedge-shaped defects of the premolars,and among the different restorative materials. The fracture-resistant forces of premolars with wedge-shaped defects were significantly increased after the wedge-shaped defects were restored (P<0.01). Conclusions: Wedge-shaped defects that are deeper than 1/4 bucco-lingual distance of premolars easily cause premolar fractures. After restored,fracture-resistant forces of premolars are increased but not related with filling materials. |
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