Burke S P, Silveira A M, Goldsmith L J, Yancey J M, Van Stewart A, Scarfe W C
University of Louisville School of Dentistry, Kentucky 40292, USA.
Angle Orthod. 1998 Feb;68(1):53-60. doi: 10.1043/0003-3219(1998)068<0053:AMAOMI>2.3.CO;2.
The meta-analysis technique of literature review was applied to a total of 26 previous studies to assess the longitudinal stability of postretention mandibular intercanine width. Weighted averages and standard deviations for the means of 1,233 subjects were compared for linear changes in intercanine transverse dimensions during treatment (T1), immediately after treatment (T2), and after removal of all retention (T3). Net change was defined as the difference between means at T3 and T1. Dimensional changes were also evaluated on the basis of patient pretreatment Angle classification, extraction, and nonextraction treatment modalities of each group. Paired two-tail t-tests were performed between T3 and T1 means on all groups at the a priori level of significance set at a < or = 0.05. Statistically significant differences were observed for the following groups: all patients; nonextraction; extraction; Class I; Class I extraction; Class II extraction; and, Class I Division 1 nonextraction. The findings of this study indicate that regardless of patient diagnostic and treatment modalities, mandibular intercanine width tends to expand during treatment on the order of one to two millimeters, and to contract postretention to approximately the original dimension. While statistically significant differences could be demonstrated within various groups, the magnitudes of the differences were not considered clinically important.
文献回顾的荟萃分析技术应用于之前的26项研究，以评估保持期后下颌尖牙间宽度的纵向稳定性。比较了1233名受试者在治疗期间（T1）、治疗结束后即刻（T2）和去除所有保持装置后（T3）尖牙间横向尺寸线性变化的加权平均值和标准差。净变化定义为T3和T1平均值之间的差异。还根据每组患者的治疗前安氏分类、拔牙和不拔牙治疗方式评估尺寸变化。在所有组中，对T3和T1平均值进行双侧配对t检验，预先设定的显著性水平为α≤0.05。在以下组中观察到统计学上的显著差异：所有患者；不拔牙；拔牙；安氏I类；安氏I类拔牙；安氏II类拔牙；以及安氏I类1分类不拔牙。本研究结果表明，无论患者的诊断和治疗方式如何，下颌尖牙间宽度在治疗期间往往会扩大1至2毫米左右，并在保持期后收缩至大致原始尺寸。虽然在各个组中可以证明存在统计学上的显著差异，但差异的大小在临床上并不被认为重要。
