预测 I 类和 II 类错颌中“有利”和“不利”的前后骨骼关系的模型。
A predictive model of "favorable" and "unfavorable" anteroposterior skeletal relations among Class Is and Class IIs.
出版信息
Angle Orthod. 2021 Sep 1;91(5):604-610. doi: 10.2319/090120-762.
OBJECTIVES
To validate the use of the sagittal distance between ANS and Pg (ANSPg) as a measure of favorable and unfavorable anteroposterior skeletal relations and to identify multivariate cephalometric measures that could be used to predict favorable and unfavorable relations at 15 years of age.
MATERIALS AND METHODS
This longitudinal study included 226 untreated adolescents evaluated at 10 and 15 years of age. Patients were grouped as "favorable" or "unfavorable" based on the ANSPg (measured parallel to S-N -7°) at 15 years of age (ANSPg15). ANSPg15 was validated based on its correlation with changes in ANSPg between 10 and 15 years of age, as well as its relationships with established measures of growth potential. Multiple regression and discriminant analyses were performed to predict ANSPg15 from measures at 10 years of age.
RESULTS
ANSPg15 and the change in ANSPg between 10 and 15 years of age were significantly correlated (R= -0.661; P ≤ .001), with 77% of patients in whom relationships improved (ie, distance decreased) exhibiting favorable relationships at 15 years of age. Established measures of growth potential were significantly (P < .001) correlated with ANSPg15 and showed significant differences between patients with favorable and unfavorable relations. Multiple regression showed that the Y-axis, ANS-N-Pg, and symphyseal angle measured at 10 years explained approximately 60% (R = 0.78) of the variation in ANSPg15. Based on these three variables, discriminant function correctly predicted favorable or unfavorable relations of ANSPg15 77% of the time.
CONCLUSIONS
ANSPg15 was a valid measure for determining favorable and unfavorable anteroposterior skeletal relationships that could be predicted with moderately high levels of accuracy.
目的
验证采用蝶鞍点（ANS）与颏前点（Pg）之间矢状距离（ANSPg）作为衡量前后向骨骼关系有利和不利的指标，并确定可用于预测 15 岁时有利和不利关系的多变量头影测量指标。
材料和方法
本纵向研究纳入了 226 名未经治疗的青少年，他们在 10 岁和 15 岁时接受了评估。根据 15 岁时的 ANSPg（与 S-N-7°平行测量）将患者分为“有利”或“不利”组（ANSPg15）。基于 ANSPg 在 10 岁至 15 岁之间的变化与其生长潜力的关系，验证了 ANSPg15 的有效性。采用多元回归和判别分析，根据 10 岁时的测量指标预测 ANSPg15。
结果
ANSPg15 与 10 岁至 15 岁之间 ANSPg 的变化显著相关（R=-0.661；P≤.001），其中关系改善（即距离减小）的 77%患者在 15 岁时表现出有利的关系。已建立的生长潜力指标与 ANSPg15 显著相关（P＜.001），且在有利和不利关系的患者之间存在显著差异。多元回归显示，10 岁时的 Y 轴、ANS-N-Pg 和下颌联合角解释了 ANSPg15 约 60%（R=0.78）的变异。基于这三个变量，判别函数正确预测了 77%的 ANSPg15 有利或不利关系。
结论
ANSPg15 是一种有效的衡量前后向骨骼关系有利和不利的指标，具有较高的准确性。
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