CAJ | 학술논문

目的：研究第三磨牙牙尖数目与牙根类型关系，从而为第三磨牙的顺利拔除提供帮助。方法：记录519颗上颌和348颗下颌完整第三磨牙牙合面牙尖数目和牙根类型，研究牙尖数目与牙根类型的关系。结果：上下颌第三磨牙均为四尖型出现频率最高（28．9％、43．1％），四尖型上颌牙Ⅲ型根（30．0％）出现频率最高，四尖型下颌牙Ⅳ型根（即双根，34．7％）出现频率最高。结论：通过观察第三磨牙牙尖数目，可以初步判断其牙根类型，为临床牙拔除术提供参考和指导。
목적：연구제삼마아아첨수목여아근류형관계，종이위제삼마아적순리발제제공방조。방법：기록519과상합화348과하합완정제삼마아아합면아첨수목화아근류형，연구아첨수목여아근류형적관계。결과：상하합제삼마아균위사첨형출현빈솔최고（28．9％、43．1％），사첨형상합아Ⅲ형근（30．0％）출현빈솔최고，사첨형하합아Ⅳ형근（즉쌍근，34．7％）출현빈솔최고。결론：통과관찰제삼마아아첨수목，가이초보판단기아근류형，위림상아발제술제공삼고화지도。
Objective:The aim of this paper is to study the relationship between the number of cusp and the type of root of the third molars,providing guidance on the removal of the third molars.Methods:Keeping a record of the number of cusp and the type of root of 519 third maxil ary molars and 348 mandibular third molars,then studying the relationship.Results:Both third maxil ary molars and mandibular third molars have a high frequency of 4 cusps(28.9%、43.1%).30.0% of third maxil ary molars with 4 cusps have 1 root(type III),34.7% of mandibular third molars with 4 cusps have 2 roots(type Ⅳ).Conclusion:The type of root might be evaluated according to the number of cusp before the third molars are extracted.