安氏Ⅰ、Ⅱ、Ⅲ类错患者Bolton不调量的分析

A Study of Bolton Tooth-size Discrepancies of Malocclusion Patients

目的 了解安氏错患者上下颌Bolton不调量的大小及发生率。方法 选择 4 39例安氏错患者的模型 ,分别测量上下颌 6个前牙 (左右恒尖牙之间 )及 1 2个恒牙 (左右第一恒磨牙之间 )的牙冠近远中宽度总和 ,根据Bolton指数正常值获取上颌Bolton不调量并作统计学分析。结果 4 39例安氏Ⅰ、Ⅱ、Ⅲ类错患者中 ,前牙或全牙Bolton不调量绝对值大于或等于 1 5mm的错患者占该类患者的百分比分别为 1 4 0 2 %、9 4 9%、1 9 32 %或1 9 6 3%、1 5 33%、2 0 4 5 %。安氏Ⅰ类错患者前牙Bolton不调量以上前牙牙量减少、下前牙牙量增多为常见 ;安氏Ⅱ类、Ⅲ类错患者 ,前牙或全牙Bolton不调者上颌和下颌牙量偏多偏少 ,差异无显著性。

Objective\ To analysis the sum and frequencies of Bolton tooth_size discrepancies Angle Class Ⅰ,Ⅱ,Ⅲ malocclusion patients.Methods\ Measured each tooth crown mesial_distal size between the first molar of 439 dental plaster casts of malocclusion patients and obtained the sums of six anterior tooth_size and twelve tooth_size between the first molar of upper or lower and calculated the anterior and total tooth_size discrepancies by Bolton rate standards, then statistic analysises were done.Results\ Patients whose sums of anterior tooth_size discrepancy were pass 1 5 mm or less than _1.5 mm was 14 02% in Angle Class Ⅰ malocclusion patients and 9 49% in Class Ⅱ and 19 32% in Class Ⅲ. Patients whose sums of tolal tooth_size discrepancy were pass 1 5 mm or less than _1 5 mm was 19 63% in Angle Class Ⅰ malocclusion patients and 15 33% in Calss Ⅱ and 20 45% in Class Ⅲ. The upper sum of anterior tooth_size of Class I malocclusion patients whose sums of anterior tooth_size discrepancies were pass 1 5 mm or less than _1 5 mm was always smaller than normal and the lower sum was always larger The sums of anterior tooth_size discrepancy of Class Ⅰ、Ⅱ、Ⅲ and total tooth_size discrepancy of Class Ⅰ were always between 1 5 mm～2 5 mm or _2 5 mm～_1 5 mm. Patients whose sums of anterior tooth_size discrepancy were pass 3 5 mm or less than _3 5 mm was 2 34% in Class Ⅰ malocclusion patients and 0 in class Ⅱ and 0 in class Ⅲ. Patients whose sums of totoal tooth_size discrepancy were pass 3 5 mm or less than _3 5 mm was 4 21% in Class Ⅰ and 1 46% in Class Ⅱ and 4 54% in Class Ⅲ.Conclusion\ Tooth_size discrepancy of malocclusion patients was not the general cause of malocclusion.\;