中文摘要：

与医学其他学科一样,口腔正畸学也不乏用模糊概念来取代精确测量的习惯做法,正畸支抗控制便是其中之一。随着循证医学的发展,正畸医师越来越重视临床证据的准确性,于是,以往对于正畸支抗控制的经验性描述逐渐显露出其弊端。本文根据笔者近年来对支抗的系列研究结果,阐述了最大支抗传统概念的模糊性、定量测量支抗丧失时常被忽略的问题及解决方法,并讨论了最大支抗的限度问题。

英文摘要：

Just like other subjects in medicine,orthodontics also uses some vague concepts to describe what are difficult to measure quantitatively.Anchorage control is one of them.With the development of evidence-based medi-cine,orthodontists pay more and more attention to the accuracy of the clinical evidence.The empirical description of anchorage control is showing inadequacy in modern orthodontics.This essay,based on author＇s recent series of studies on anchorage control,points out the inaccuracy of maximum anchorage concept,commonly neglected points in quantita-tive measurement of anchorage loss and the solutions.It also discusses the limitation of maximum anchorage control.