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目的研究下颌第三磨牙阻生类型同体左、右对称性。方法收集186例下颌第三磨牙拔除病例数据。所有患者进行临床检查并拍摄曲面断层片。按照Pell-Gregory升支分类、Pell-Gregory牙合平面分类和Winter分类对左、右两侧下颌第三磨牙阻生类型分别进行分类。对两侧下颌第三磨牙阻生类型进行描述性统计分析和Spearman相关分析。结果三种阻生类型两侧完全对称者95例,占51.1%;任意两种阻生类型两侧均对称,另一种不对称者占19.9%;三种阻生类型中仅一种两侧对称,另两种不对称者占14.5%;三种阻生类型两侧均不对称者占14.5%。两侧下颌第三磨牙Pell-Gregory升支分类(r=0.51,P=0.01)、Pell-Gregory牙合平面分类(r=0.41,P=0.01)和Winter分类(r=0.48,P=0.01)均有显著相关性,将每侧下颌第三磨牙三种阻生类型合并,两侧也具有显著相关性(r=0.67,P=0.01)。结论同体两侧下颌第三磨牙阻生类型具有对称性,一侧下颌第三磨牙的阻生类型、临床病理以及治疗方案对另一侧具有指导意义。
Objective To study the left and right symmetry of impacted mandibular third molar type. Methods 186 cases of mandibular third molar removal cases data. All patients underwent clinical examination and photographed curved sections. According to the Pell-Gregory ascending branch classification, the Pell-Gregory occlusal plane classification and the Winter classification, the left and right mandibular third molar incontinence types were classified respectively. Descriptive statistical analysis and Spearman correlation analysis of the impacted mandibular third molars on both sides were performed. Results There were 95 cases of complete symmetry on both sides of the three types of impaction, accounting for 51.1%; both sides of any two types of implants were symmetrical and the other asymmetric accounted for 19.9%; only one of the three implants Symmetrical, the other two asymmetric accounted for 14.5%; three types of non-symmetry on both sides accounted for 14.5%. Pell-Gregory ascending branch classification (r = 0.51, P = 0.01), Pell-Gregory occlusal plane classification (r = 0.41, P = 0.01) and Winter classification (r = 0.48, There were significant correlations between the three types of impacted mandibular third molars. There was also a significant correlation between them (r = 0.67, P = 0.01). Conclusion The impacted type of mandibular third molar on both sides of the body is symmetrical. The impacted type, clinical pathology and treatment of mandibular third molar on one side are instructive on the other side.