不同牙尖斜度对隐裂牙折裂模式及风险的影响

发布时间：2018-02-02 20:26

  本文关键词： 隐裂牙 牙尖斜度 折裂模式 折裂危险等级　出处：《口腔医学研究》2017年09期 　论文类型：期刊论文

【摘要】：目的:研究隐裂牙牙尖斜度对其折裂模式的影响,并制定折裂危险等级评分及治疗方案。方法:将40颗上颌前磨牙随机分为4组,前3组制备成不同牙尖斜度的隐裂牙模型,第4组不做处理作为对照组。所有试样进行压应力实验,记录折裂模式和危险等级,进行统计学分析。结果:就折裂模式:第1、2组试样发生冠根折数目较冠折多,第3组全部发生冠根折,第4组全部为冠折;就折裂危险分级:第1、2组发生III级折裂较多,第3组发生IV级折裂较多,第4组仅发生Ⅰ、Ⅱ级折裂,经随机区组秩和检验,第3组和第4组折裂危险等级与其余各组间有显著统计学差异(P0.05),第1、2组间无统计学差异。结论:隐裂牙比正常牙齿更易发生复杂折裂。隐裂牙随着牙尖斜度增大到一定角度,折裂模式更加复杂,折裂危险等级也愈高,治疗预后越差。
[Abstract]:Objective: to study the effect of cusp inclination on the fracture pattern and to make the risk score and treatment plan. Methods: 40 maxillary premolars were randomly divided into 4 groups. The first three groups were made into different cusp oblique occlusal teeth model, the fourth group was not treated as the control group. All the samples were subjected to compressive stress experiments to record the fracture mode and danger grade. Results: according to fracture pattern, the number of crown root fractures in group 1 and 2 was more than that in group 3, and that in group 4 was crown fracture. According to the classification of fracture risk, III grade fracture occurred more in group 1, grade IV in group 3, and grade 鈪，

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