牙列拥挤值与Howes比值的相关研究

The study of Correlation Between Dentition Crowding Value and Howes' Ratio

通过研究６５例拥挤上颌模型的拥挤值与Ｈｏｗｅｓ比值，以Ｈｏｗｅｓ比值作为自变量Ｘ，以牙弓拥挤值作为因变量Ｙ，可得出回归方程∧Ｙ＝３３．６９４７－０．７１８４Ｘ２（Ｘ２表示ＰＭＤ／ＴＭ），结果表明ＰＭＤ／ＴＭ与拥挤值间呈负相关关系，同时本文对此回归方程在临床上的应用做了分析．

The crowding value of 65 cases of crowding maxillary cast and Howes' ratio was studied.Considering Howes' ratio as an independent variable X,and the crowding value of dental arch as a dependent variable Y,it could conclude that regression equation was ∧Y=33.6947-0.7184X 2(X 2 indicating PMD/TM).The result showed that correlation between PMD/TM and the crowding value was negative,Meanwhile,the clinical application of the regression equation was analysed.It is concluded that the cause of dentition crowding is complicated.