恒前牙髓室解剖影像学的初步研究  

Radiographic Anatomy of Pulp Chamber of Chinese Permanent Anterior Teeth

作　　者：贾刘合[1] 黄定明[2] 高小洁[1] 罗世高[1] 罗红霞[1] 谭红[2] 周学东[1] 

机构地区：[1]口腔生物医学工程教育部重点实验室四川大学,四川成都610041 [2]四川大学华西口腔医院牙体牙髓科,四川成都610041

出　　处：《华西口腔医学杂志》2006年第3期250-253,共4页West China Journal of Stomatology

基　　金：国家"十五"科技攻关资助项目(2004BA720A23);卫生部临床学科重点建设资助项目[卫(2004-468号)]

摘　　要：目的探讨中国人恒前牙髓室影像解剖学特征及其与牙体外表特征的关系。方法采用游标卡尺测量137个离体恒前牙冠长、冠宽、冠厚等牙体解剖指标,然后采用平行投照技术拍摄唇舌向和近远中向X线片,并采用Photoshop8.0软件测量髓室最大唇舌径、最大近远中径、髓室高及舌面髓壁距等影像解剖指标,计算髓室最大唇舌径与冠厚之比、髓室最大近远中径与冠宽之比、髓室高与冠长之比和髓室顶厚,得出以上指标的变异系数。结果①上下颌尖牙的髓室近远中径与冠宽之比与其余牙位间的差异有统计学意义(P<0.05),而上下颌尖牙间则无统计学差异,上下颌中切牙、侧切牙间此比值的均值也无统计学差异(P>0.05)。②髓室指标的变异远大于牙体外表指标的变异程度。③舌面髓壁距的变异系数最小。④除下颌尖牙外,髓室的最大近远中径变异最大。结论恒前牙的舌面髓壁距可以作为临床开髓洞深的参考指标;而开髓的时候,不要轻易向近远中向扩展。Objective The aim of this study was to measure and analyze the anatomic characteristics of the pulp chamber of Chinese permanent anterior teeth radiographically. Methods There were 137 human permanent anterior teeth to be used. The crown length, crown width and crown thickness were measured by vernier caliper. Labial- lingual and mesial-distal radiographs were obtained by parallel technique and Photoshop 8.0 was adopted for measuring the largest labial-lingual length, the largest mesial-distal length, the pulp chamber height and the distance between the lingual surface of the crown and the corresponding wall of the pulp chamber;, the ratios of the largest labial-lingual length to the crown thickness, the largest mesial-distal length to the crown width and the pulp chamber height to the crown length were calculated. Finally the coefficients of variance were caculated. Results ① The ratios of the largest mesial-distal length to the crown width of maxillary and mandibular canines were statistically different from those of the other anterior teeth. There was not statistically significant difference for those ratios either between maxillary and mandibular canines or among incisors. ②Indexes of the pulp chamber had higher variance than those of the external morphology. ③The distance between the lingual surface of the crown and the corresponding wall of the pulp chamber had the smallest coefficient of variance. ④The largest mesial-distal length of the pulp chamber had the largest coefficient of variance, except for the mandibular canines. Conclusion This study provided anatomical basis for clinical work; the distance between the lingual surface of the crown and the corresponding wall of the pulp chamber could be used as a depth reference for the endodontic access, and the access should not be extended excessively in mesial-distal direction.

关 键 词：恒前牙 髓室 解剖 变异系数 

分 类 号：R816.98[医药卫生—放射医学]