下颌第三磨牙的根管形态观察

目的:观察研究下颌第三磨牙根管形态。方法:利用透明牙技术对147颗下颌第三磨牙进行处理,在体式显微镜下观察根管形态并进行分析。结果:147个下颌第三磨牙中,66个为融合根,81个为分叉根。融合根的下颌第三磨牙根管类型主要为Ⅴ型,占41.0%;分叉根的下颌第三磨牙根管类型主要为Ⅳ型,占41.3%。根管侧支,根尖分歧,管间交通,根尖Delta在下颌第三磨牙中均有出现。融合根下颌第三磨牙管间交通的发生率高达51.5%。结论:下颌第三磨牙根管形态变异较大,根管治疗过程中应仔细探查和处理。

Evaluation of Root Canal System in Mandibular Third Molars

Objective: To investigate the morphology of root canal system in mandibular third molars. Methods: A total of 147 mandibulars were treated by using clearing technique, and then the root canal systems of all the teeth were investigated under stereomicroscope. Results: Of the 147 mandibular third molars, 66 had a fused root and 81 had separated roots. Of the 66 mandibular third molars with fused root, 41.0% showed type Ⅴ configuration, which was the main root canal type of mandibular third molars with fused root. In the 81 mandibular third molars with separated roots, the main root canal type was type Ⅳ totally in 41.3%. Of the 147 mandibular third molars, lateral canal, ramification and communication between canals and apical delta were all found. The prevalence of inter-canal communication in the mandibular third molars with fused root was 51.5%. Conclusion: The morphology of root canal system in mandibular third molar is very complicated, which may increase the difficulty of root canal therapy, so the dentists should pay attention to examinations before clinical treatment.