CAJ | 학술논문

目的：通过对恒牙早期安氏Ⅱ类1分类错治疗结果的回顾性研究,为该类患者拔牙与否的选择提供一个判别方程。方法应用PAR指数对矫治前后的143例恒牙早期的安氏Ⅱ类1分类错患者牙模型进行评估分析,按矫治结果等级分为三类：A、变坏或无改善,B、改善,C、极大改善,然后将B、C两类患者矫治前的头影测量片及模型分析数据按拔牙与未拔牙进行两样本t检验的单因素分析,找出两组间有统计学差异的软硬组织和牙模型指标,对这些指标合并年龄因素进行逐步判别分析。结果通过逐步判别分析得出的判别方程为：Z=0.952x1(下颌拥挤度)+0.591x2(上中切牙凸距)-0.430x3(上唇厚度),Z≥0时,拔牙的可能性较大,Z<0时,不拔牙的可能性较大。结论临床上在排除各种主观因素的影响外,下颌拥挤度、上中切牙凸距、上唇厚度是决定恒牙早期安氏Ⅱ类1分类错拔牙与否的重要因素。
목적：통과대항아조기안씨Ⅱ류1분류착치료결과적회고성연구,위해류환자발아여부적선택제공일개판별방정。방법응용PAR지수대교치전후적143례항아조기적안씨Ⅱ류1분류착환자아모형진행평고분석,안교치결과등급분위삼류：A、변배혹무개선,B、개선,C、겁대개선,연후장B、C량류환자교치전적두영측량편급모형분석수거안발아여미발아진행량양본t검험적단인소분석,조출량조간유통계학차이적연경조직화아모형지표,대저사지표합병년령인소진행축보판별분석。결과통과축보판별분석득출적판별방정위：Z=0.952x1(하합옹제도)+0.591x2(상중절아철거)-0.430x3(상진후도),Z≥0시,발아적가능성교대,Z<0시,불발아적가능성교대。결론림상상재배제각충주관인소적영향외,하합옹제도、상중절아철거、상진후도시결정항아조기안씨Ⅱ류1분류착발아여부적중요인소。
Objective The retrospective study was designed to observe correlative factors which had influenced on extrac-tion decision in ClassⅡ,Division 1 malocclusion,and provide a discriminate function for clinical treatment planning.Methods The sample consisted 143 children which were in early permanent dentition of ClassⅡ,Division 1 malocclusion.Pre-treatment and post-treatment study models were assessed using Peer Assessment Rating (PAR)index.According to the outcome of treat-ment,these cases were classified into three types as “worse,no different”,“improved”and “greatly improved”.The cephalo-metric analysis and Model Analysis were preformed with pre-treatment lateral cephalograms and study models for “improved”and “greatly improved”cases.“T”-test was assessed to find out the significant difference between the extraction and nonextrac-tion,and the results including age factor were analyzed by stepwise discriminant analysis.Results A discriminate function,Z=0.952x1 (lower tooth crowd degree)+ 0.591x2 (U1-Apgmm)-0.430x3 (upper lip thickness)was produced by multiple factorial discrminate analysis.Z≥0 was an indication of extraction,and Z<0 was an indication of nonextraction on the other side.Conclusion The results showed that the lower tooth crowd degree,protrusion of the maxillary incisor and upper lip thick-ness were keys to decide whether extraction or not getting rid of the influence of subj ective factors.