第三磨牙与错畸形关系的研究

The study with the relationship between third molar and malocclusion

目的:观察第三磨牙与错(牙合)畸形的关系。方法:对620名错(牙合)畸形患者治疗前的全颌曲面断层片进行研究。结果:第三磨牙缺失率为14.84％;安氏Ⅲ类错(牙合)的第三磨牙缺失率明显大于安氏Ⅱ类和安氏Ⅰ类(X^2=16.34,P<0.01);安氏Ⅱ类错(牙合)畸形的上颌第三磨牙的发育率为71.75％,明显高于其缺失率和安氏Ⅲ类错(牙合)畸形上颌第三磨牙的发育率(X^2=9.78,P<0.01);安氏Ⅲ类错(牙合)畸形的下颌第三磨牙发育率为74.12％,与安氏Ⅱ类错(牙合)畸形的上颌第三磨牙的发育率相近。结论:第三磨牙是导致错(牙合)畸形的病因之一,错(牙合)畸形患者矫治前应常规拍摄全颌曲面断层X线片。

Objective: It was studied the relationship between third molar and malocclusion. Method: It was studied panoramic radiograph film of 620 patient with malocclusion in Affiliated Haspital for Stomatology Othodontics Department in Nanjing Medical University. Result:Missing third molar was in 14. 84% . Missing third molar in Angle Classification Ⅲ was higher than in Angle Classification Ⅱ and Ⅰ . Conclusion; The author by analysis considered: The third molar was important etiology of malocclusion