摘要
目的 :通过研究后牙弯曲根管 ,了解根管冠部预处理对根管弯曲度的影响。方法 :将弯曲度在 12°～ 35°的 4 8个前磨牙和 4 8个第一、二磨牙按照弯曲度不同分别分成两组 ,一组弯曲度为 12°～ 2 0° ,另一组为 2 1°～ 35°。用GG钻行根管弯曲部分冠部预处理后 ,Schneider法测量根管弯曲度 ,比较相互间有无明显差异。结果 :前磨牙和磨牙 4组标本根管冠部预处理前后的弯曲度相互间均存在显著性差异 (P <0 .0 5 )。前磨牙不同弯曲度的两组标本 ,冠部预处理前后根管弯曲度的改变相互间无显著差异 (P >0 .0 5 ) ,而两组磨牙标本相互间存在显著差异 (P <0 .0 5 ) ;并且 ,在弯曲度较大的一组 (2 1°～ 35°) ,磨牙的弯曲度变化要显著大于前磨牙(P <0 .0 5 )。结论 :用GG钻行根管弯曲部分冠部预处理后能显著减小根管弯曲程度 ,降低根管预备难度 。
AIM:To study the effect of coronal preflaring on the degree of root canal curvature in premolars and molars.METHODS:Forty-eight premolars and forty-eight first and second molars,with the degree of curvature from 12°～35° determined by Schneider′s method,were selected for this study.According to the degree of curvature,the specimen of premolars and molars were respectively divided into two groups.One from 12°～20° and the other from 21°～35°.The changes of degree of root canal curvature before and after coronal preflaring with Gates Glidden drills were compared.RESUTLS:The degree of root canal curvature before and after coronal preflaring for each group was different significantly (P<0.05).The changes of curvature degree for two premolar groups were not different significantly (P>0.05).However,the changes of two molar groups were different significantly (P<0.05).In the group with the degree from 21°～35°,the change of curvature degree of molars was larger than that of premolars (P<0.05). CONCLUSION:Coronal preflaring can make curved root canal preparation easy because the degree of root canal curvature were reduced significantly by Gates Glidden drills.And the curvatures of molars were reduced more.
出处
《牙体牙髓牙周病学杂志》
CAS
2004年第5期261-264,共4页
Chinese Journal of Conservative Dentistry
基金
上海市科委青年启明星计划 ( 0 1QB14 0 2 5 )
