성장기 환자에서 하악의 차등적 소구치 발치

김도훈; 성상진; 문윤식

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성장기 환자에서 하악의 차등적 소구치 발치
MANDIBULAR DIFFERENTIAL PREMOLAR EXTRACTION IN GROWING PATIENTS

Korean Journal of Orthodontics 2001년 31권 1호 p.1 ~ 13

김도훈, 성상진, 문윤식,

소속 상세정보

김도훈 (  ) - 울산대학교 의과대학 치과학교실
성상진 (  ) - 울산대학교 의과대학 치과학교실
문윤식 (  ) - 울산대학교 의과대학 치과학교실

KMID : 0361920010310010001

Abstract

The extraction for orthodontic treatment can be adopted for aligning crowded dentition, improving facial esthetics and solving a skeletal discrepancy as alternative for a surgical option. Mandibular second premolar extraction was often selected as treatment plan when there are very little or no space shortage in lower arch or limited retraction of the lower incisors was required.
The primary object of this study was evaluate a pretreatment condition and examine the amount of tooth movement for a mandibular second premolar extraction in growing patients. Pretreatment and posttreatment lateral cephalograms of 14 cases that had their four first premolar extracted (4/4 group), 15 cases with upper first and lower second premolar extraction (4/5 group) were selected. Structural method superimposition was conducted to evaluate a difference of dental change between 4/4 and 4/5 group.

The results were as follows,

1. Pretreatment factor for 4/4 extraction or 4/5 extraction´; choice included maxillary incisor axis to occlusal plane, Class II molar relationship, IMPA and interincisal angle.
2. The .amount of molar anterior movement in 4/5 group was greater than that of 4/4 group(p<0.05).
3. There was no significant difference between 4/4 group and 4/5 group in aspects of maxillary tooth movement(p