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The comprehensive study of the causes of non carious cervical lesions and mandibular tori

颈椎非龋性病变及下颌环面病因综合研究

基本信息

批准号：
15570198
负责人：
IGARASHI Yuriko
金额：
$ 2.3万
依托单位：
Nihon University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

The frequency and morphology of non carious cervical lesions (NCCL) were examined in Japanese isolated teeth (276 upper incisors, 179 upper canines). Before examinations, we defined a new classification system. NCCL were found in 38% of incisors and in 63% of canines. The shapes of NCCL were classified by the contour of sagittal section and by the contour on surface. In incisors and canines, different types of NCCL were found, and the causes of NCCL have been suggested to be different by the kind of tooth.The frequency and morphology of mandibular torus, and the correlations between the development of tori (the class of tori and the size of the tori) and environmental factors (the number of teeth, the degree of crowding and the degree of dental attrition) were examined by skeletal materials of Jomon people, Kamakura people and modern Japanese people, plaster casts of present-day Japanese dental patients, present-day Japanese students and present-day Papua New Guinea Highlanders. Before examinations, we defined a new torus grading system. There were no statistically significant differences between males and females and between left sides and right sides in the distribution of torus classes and positions. 83.5% of Jomon people, 62.3% of Kamakura people, 64.8% of modern Japanese, 76.6% of present-day Japanese patients, 72.0% of present-day Japanese students, and 80% of present-day Papua New Guinea Highlanders had palpable tori. In Jomon people, tori were most frequently found under the second and first molars. In other groups, tori were most frequently found under the first and second premolars The development of tori has been suggested to positively correlated to the degree of dental attrition, the number of teeth, and age, and negatively correlated to the degree of crowding. Biomechanical study has suggested that tori develop in the mandible with more high density of compact bone.

本文对日本人276颗上切牙和179颗上尖牙的非龋性牙颈部病变（NCCL）的发生率和形态进行了观察。在考试之前，我们定义了一个新的分类系统。在38%的切牙和63%的尖牙中发现了NCCL。根据矢状面轮廓和表面轮廓对NCCL进行形态分类。在切牙和尖牙中，发现了不同类型的NCCL，并且NCCL的原因可能因牙齿的种类而异。（圆环面的类别和圆环面的大小）和环境因素通过对绳纹人、镰仓人和现代日本人的骨骼材料进行检查，这些石膏模型是今天的日本牙科病人、今天的日本学生和今天的巴布亚新几内亚高地人。在考试之前，我们定义了一个新的环面分级系统。男女之间以及左右两侧之间的环面类和位置分布无统计学显著性差异。83.5%的绳文人、62.3%的镰仓人、64.8%的现代日本人、76.6%的现代日本病人、72.0%的现代日本学生和80%的现代巴布亚新几内亚高地人有明显的托丽。在绳纹人中，托丽最常见于第二和第一臼齿下。在其他组中，最常见的是在第一和第二前磨牙下的Tori。Tori的发育与牙齿磨损程度、牙齿数量和年龄呈正相关，与拥挤程度呈负相关。生物力学研究表明，在下颌骨中，致密骨密度较高的部位会形成隆突。