제 1소구치 발치를 동반한 제 Ⅰ급 치조성 양악 전돌 환자의 치료 전·후 비교에 관한 연구

Abstract

[한글]

저자는 제 1 소구치 발치를 동반한 제 I 급 치조성 양악 전돌 환자의 석고 모형과 측모 두부 방사선 사진상에서의 치료 전후의 변화량을 알아보고 견치의 후방견인 방법(Sectional canine retraction과 Sliding canine retraction)과 anchorage의 보강(Head gear, Tr

anspalatal arch와 Lingual arch)유무에 따른 전치와 구치의 이동양을 비교해 보고 또한 석고모형과 측모 두부 방사선 사진을 연관지어 치료기간 동안 발생된 변화 양상을 알아보고자 초진시 16세 이상의 여자환자 77명의 치료 전후의 석고 모형과 측모 두부 방사선 사

진을 대상으로 조사한 바 다음과 같은 결과를 얻었다.

1. 치료기간 중 대구치간 폭경, 치열궁 장경, 치열궁 주위 장결은 상하악 모두 치료 후에 유의성 있는 감소를 보였고 견치간 폭경은 상하악 모두 유의성 있는 차이를 보이지 않았다.

2. 상악 중절치(Ul)와 상순(Ls)의 이동 비율은 2.84 : 1이며 하악 중절치(Ll)와 하순(Li)의 이동 비율은 1.45 : 1 이었다.

3. 전치의 후방 이동양과 구치의 전방 이동양의 비교에서 견치의 후방 견인 방법(sectional canine retraction 대 sliding canine retraction)과 transpalatal arch나 lingual arch의 사용 유무에 따라서는 유의성 있는 차이가 없었으며 head gear를 사용한 군이 사

용하지 않은 군에 비해 전치의 후방 이동양은 유의성 있게 크게 나타났고 구치의 전방 이동양은 유의성 있게 작게 나타났다.

4. 치료 전후의 석고 모형을 통한 악궁 크기의 변화를 측모 두부 방사선 사진상에서의 변화와 연관지어 전치 견치 및 대구치의 변화양상을 알아본 바 다음과 같이 나타났다.

1) 상악

중절치는 후방으로 3.77mm 이동하였고, 견치는 외측으로 0.22mm 후방으로 3.70mm 이동하였으며 대구치는 내측으로 0.535mm 전방으로 2.29mm 이동하였다.

2) 하악

중절치는 후방으로 3.04mm 이동하였고, 견치는 외측으로 0.145mm 후방으로 3.92%mm 이동하였으며 대구치는 내측으로 0.755mm 전방으로 1.77mm 이동하였다.

THE STUDY OF COMPARISON BEFORE AND AFTER ORTHODONTIC TREATMENT IN CLASS I

BIALVEOLAR PROTRUSION CASES WITH FOUR BICUSPID EXTRACTION

HYUNG DON KIM, D.D.S.

Department of Dental science, Graduate School, Yonsei University

(Directed by prof. Young-Ghel Park, D.D.S., Ph.D.)

The purposes of present study were to evaluate changes in models and lateral

cephalometric head films during orthodontic treatment and to compare the amount of

incisal retraction and anterior movement of molars with the two approaches of the

retraction method of canine(sectional canine retractions vs sliding canine

retractions) and the anchorage management(head gears vs no head gears, transpalatal

arches vs no transpalatal arches and lingual arches vs no lingual arches) and to

evaluate changes during orthodontic treatment in models with relation to lateral

cephalometric head films.

67 Korean women with Angle's Class I bialveolar protrusion were selected, whose

initial chronologic age was above 16 yrs.

Models and lateral cephalometric head films were taken before and after

orthodontic treatment with four bicuspid extraction. the results were obtained as

follows :

1. Significant decreases were observed in intermolar with, arch length and arch

perimeter of maxilla and mandible but significant difference was not obserred in

intercanine with of maxilla and mandible during treatment period.

2. The linear change of the upper incisor to upper lip was 2.84 : 1 and the

linear change of the lower incisor t? lower lip was 1.45 : 1.

3. There were no significant differences between the two groups(sectional canine

retractions vs sliding canine retractions), the two groups(transpalatal aches vs no

transpalatal arches) and the two groups(lingual arches vs no lingual arches) in the

amount of incisal retraction and anterior movement of molars.

There were a greater amount of maxillary incisal retraction and a lesser amount

of anterior movement of maxillary molars with the use of head gears than no use of

head gears.

4. Changes during orthodontic treatment in models with relation to lateral

cephalometric head films were obtained as follows :

1) maxilla

Central incisors were moved 3.77mm backward, canines were moved 0.22mm laterally

and 3.70mm backward, and molars were moved 0.57mm medially and 2.29mm forward.

2) Mandible

Central incisors were moved 3,04mm backward, canines were moved 0.145mm laterally

an d3.92mm backward, and molars were moved 0.755mm medially and 1.77mm forward.

[영문]

The purposes of present study were to evaluate changes in models and lateral cephalometric head films during orthodontic treatment and to compare the amount of incisal retraction and anterior movement of molars with the two approaches of the retraction method of canine(sectional canine retractions vs sliding canine

retractions) and the anchorage management(head gears vs no head gears, transpalatal arches vs no transpalatal arches and lingual arches vs no lingual arches) and to evaluate changes during orthodontic treatment in models with relation to lateral

cephalometric head films.

67 Korean women with Angle's Class I bialveolar protrusion were selected, whose initial chronologic age was above 16 yrs.

Models and lateral cephalometric head films were taken before and after orthodontic treatment with four bicuspid extraction. the results were obtained as follows :

1. Significant decreases were observed in intermolar with, arch length and arch perimeter of maxilla and mandible but significant difference was not obserred in intercanine with of maxilla and mandible during treatment period.

2. The linear change of the upper incisor to upper lip was 2.84 : 1 and the linear change of the lower incisor t? lower lip was 1.45 : 1.

3. There were no significant differences between the two groups(sectional canine retractions vs sliding canine retractions), the two groups(transpalatal aches vs no transpalatal arches) and the two groups(lingual arches vs no lingual arches) in the amount of incisal retraction and anterior movement of molars.

There were a greater amount of maxillary incisal retraction and a lesser amount of anterior movement of maxillary molars with the use of head gears than no use of head gears.

4. Changes during orthodontic treatment in models with relation to lateral cephalometric head films were obtained as follows :

1) maxilla

Central incisors were moved 3.77mm backward, canines were moved 0.22mm laterally and 3.70mm backward, and molars were moved 0.57mm medially and 2.29mm forward.

2) Mandible

Central incisors were moved 3,04mm backward, canines were moved 0.145mm laterally an d3.92mm backward, and molars were moved 0.755mm medially and 1.77mm forward.