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目的研究下颌恒切牙根管路径成直线时的最佳开髓位置以及不同开髓法对根管器械弯曲程度的影响。方法采用自身对照法,将2010—2011年山西省人民医院口腔中心拔除的82颗离体下颌恒切牙先后行传统舌侧开髓(舌侧开髓组)和唇侧开髓(唇侧开髓组),分别插不锈钢K锉拍近远中向投照的数字化牙片,分析舌侧开髓组器械在根管内成直线时的开髓位置,比较两组器械根管入角和器械在根管内的弯曲角度。结果下颌恒切牙的最佳开髓位置在唇侧者占25.61%,位于切缘者占73.17%,位于舌侧者仅占1.22%;下颌恒切牙采用唇侧开髓后器械的根管入角和弯曲角度均小于舌侧开髓(P<0.05)。结论下颌恒切牙采用唇侧甚至切缘开髓可减小根管器械的弯曲程度,降低根管治疗的难度。
Objective To study the optimal position of medullary canal when the root canal path of the mandibular permanent incisors is straight and the influence of different medullary methods on the degree of the root canal instruments bending. Methods 82 cases of mandibular permanent incisors extracted from the oral center of Shanxi Provincial People’s Hospital from 2010 to 2011 were treated with the traditional lingual pulp (lingual pulp group) and the labial pulp Medullary group), respectively, inserted stainless steel K-file near and far to the projection of digital dental slices, analysis of lingual open pulp device in the root canal straight line when the open pulp position, compare the two groups of instruments root canal angle and equipment Bending angle in the root canal. Results The best open pulp position of mandibular constant incisors was 25.61% on the labial side, 73.17% on the margins and 1.22% on the lingual side. The mandibular permanent incisors were treated with the root canal Angle of entry and bending angle were less than the lingual pulp (P <0.05). Conclusions The mandibular constant incisors can be used to reduce the bending of root canal instruments and to reduce the difficulty of root canal therapy.