하악 제 2대구치의 발치후 제 3대구치의 변화에 관한 연구

Abstract

[한글]

저자는 하악 제 2대구치를 발거하여 부정교합을 치료받은 부정 교합 환자(남자 7명, 여자 13명중)의 발치 전후의 두부방사선 사진과 Orthopantomogram을 이용하여 하악 제3대구치의 변화를 관찰하여 다음과 같은 결론을 얻었다.

1. 발치시기는 하악 제 3대구치의 Nolla's stage 4, 5시기에 시행하는 것이 바람직하다.

2. 발치전 변수값으로 발치후 하악 제 3대구치의 맹출상태를 예측할 수 있는 함수를 구하였다.

3. 하악 제 3대구치가 매복되는 경우는 하나도 존재하지 않았다.

THIRD MOLAR CHANGES FOLLOWING LOWER SECOND MOLAR EXTRACTIONS

Soon Chang Hong

Department of Dental Science, Graduate School, Yon Sei University

(Directed by Prof. Young Kyu Ryu, D.D.S., Ph.D.)

The purpose of this study was to observe the changes of the lower 3rd molars

following the extraction of the lower 2nd molars by Lateral Cephalograms and

Orthopantomograms.

The subjects consisted of twenty malocclusion, 7 males 13 females, were 19 year 5

month old at the removal of the lower 2nd molars, 19 year 1 month old at the end of

the orthodontic supervision after the removal of the lower 2nd molars (mean age).

The obtained results were as follows;

1. It is recommended to extract the lower 2nd molars when the lower 3rd molars

are Nolla's Stage 4 or 5.

2. With the pre-extraction variables obtained by factor analysis, it was possible

to predict the long axis of the lower 3rd molars after 2nd molar extraction.

3. There were no impacted 3rd molars.

[영문]

The purpose of this study was to observe the changes of the lower 3rd molars following the extraction of the lower 2nd molars by Lateral Cephalograms and Orthopantomograms.

The subjects consisted of twenty malocclusion, 7 males 13 females, were 19 year 5 month old at the removal of the lower 2nd molars, 19 year 1 month old at the end of the orthodontic supervision after the removal of the lower 2nd molars (mean age).

The obtained results were as follows;

1. It is recommended to extract the lower 2nd molars when the lower 3rd molars are Nolla's Stage 4 or 5.

2. With the pre-extraction variables obtained by factor analysis, it was possible to predict the long axis of the lower 3rd molars after 2nd molar extraction.

3. There were no impacted 3rd molars.