磨损对下颌第一磨牙形态影响的特点研究  

Effect of tooth wear on morphological features of the mandibular first molars

作　　者：于世宾[1] 王美青[1] 李永奇[2] 张俊华[1] 

机构地区：[1]西安第四军医大学口腔医学院解剖生理教研室,710032 [2]西京医院综合诊疗科

出　　处：《实用口腔医学杂志》2004年第6期757-760,共4页Journal of Practical Stomatology

摘　　要：目的 :探讨磨损对下颌第一磨牙形态特点的影响。方法 :选择磨损和基本无磨损的离体下颌第一磨牙各 15颗 ,通过实体测量与电子测量尺辅助下影像学测量相结合的方法分别测量牙体外形与髓腔的有关数据。结果 :①无磨损组近远中径显著大于颊舌径 ,但磨损组差异不显著 ;②无磨损组髓顶最低点到牙合面的垂直距离大于磨损组 ;③无磨损组远中两髓角到牙合面的垂直距离大于同侧近中髓角到牙合面的距离 ,但磨损组无此现象 ;④磨损组与无磨损组均显示远舌髓角到远中邻面的距离大于近舌髓角到近中邻面的距离 ,无磨损组远颊髓角到远中邻面的距离大于近颊髓角到近中邻面的距离 ,但磨损组无显著差异。结论 :磨损对于同一牙齿的不同部位影响不同 ,下颌第一磨牙牙合面远中及远中邻面颊侧是易被磨损的部位 。Objective:To investigate the effect of tooth wear on the morphological features of mandibular first molars. Methods:15 extracted mandibular first molars with tooth wear and 15 without wear were investigated. Data about the morphological features of tooth were collected through the general measurement and the image measurement by electronic meter. Results:①In non-tooth-wear group, mesiodistal width of tooth was greater than buccolingual width(P<0.01), while no significant difference was found in tooth-wear group(P>0.05); ②The vertical distance between the lowest point of pulp chamber roof and occlusal surface in non-tooth-wear group was greater than that in tooth-wear group(P<0.01); ③In non-tooth-wear group, the vertical distances between occlusal surface and the two distal pulp horns were greater than that of their counterparts of mesial pulp horns(P<0.01), but no differnce was found in tooth-wear group(P>05); ④The distance between distolingual pulp horn and distal proximal plane was greater than that between mesiolingual pulp horn and mesial proximal plane in both two groups(P<0.01), while in non-tooth-wear group the distance between distobuccal pulp horn and distal proximal plane was greater than that between mesiobuccal pulp horn and mesial proximal plane(P<0.05), but no significant difference was found in tooth-wear group(P>0.05). Conclusion:For different parts of tooth, the effect of tooth wear differs. As for mandibular first molars, the distal part of occlusal surface and the buccal part of distal proximal plane are susceptible to tooth wear, which is mainly due to occlusal factors and the features of biomechanical system.

关 键 词：牙齿磨损 下颌第一磨牙 影像学 测量 

分 类 号：R780.2[医药卫生—口腔医学]