제 Ⅲ급 부정교합 환자에서 상악골 전방견인이 성장에 미치는 효과에 대한 연구

Abstract

[한글]

골격성 Ⅲ급 부정교합의 치료는 원인과 치료시기에 따라 치료법이 다양하게 적용되어지며, 성장이 활발한 어린이들에서 상악골 열성장인 경우는 상악골 전방견인이 효과적인 치료법으로 사용되고 있다.

상악골 전방견인의 효과는 순수하게 상악골 자체의 전, 하방성장이 촉진된 것이라기보다는 상악골의 정상 성장과 치료 과정중 동반된 하악골의 후하방 전위와 치아의 보상적 이동에 의한 것으로 주로 받아들여지고 있다.

본 연구는 상악골 전방견인을 시행한 7세부터 13세 사이의 치료군 104명과 연간 성장량을 알 수 있는 7세부터 12세 사이의 정상군 남자 19명, 여자 21명을 누년적으로 선택하여 측모 두부방사선사진 상에서 상하악골 및 치열의 변화량을 연령별로 비교 분석하여 다음과 같은 결과를 얻었다.

1. 치료군에서 상악골은 정상군 보다 전방이동 하였으며, 하악골은 정상군 보다 후방변위 되었다.

2. 치료군에서 상악골 하방이동은 정상군과 유사하였고, 여자 12세군에서 유의성이 있었으며, 치료군에서 하악골의 하방이동도 정상군과 유사하였다.

3. 치료군에서 상악 중절치는 정상군보다 전방이동 되었고 남자 8세, 10세 군과 여자8세,9세,10세 군에서 유의성이 있었으며, 치료군에서 상악 중절치의 하방이동은 정상군과 유사하였고 남녀 7세, 8세 군에서만 유의성이 있었다.

이상의 결과들과 치료기간을 고려할 때 상악골 전방견인에 의한 상악골 전방이동은 정상군의 성장량에 비해 효과가 있었다.

EFFECTS OF MAXILLARY PROTRACT10N ON GROWTH IN CIASS Ⅲ MALOCCLUSiON

Sang-Jin Sung, D.D.S.

Dept. of Dental Science, The Graduate School Yonsei University

(Directed by Associate Professor Hyoung-Seon Baik D.D.S, Ph.D)

The method of treatment in skeletal Class Ⅲ malocclusion must be chosen

according to an etiology and timing of the treatment. Maxillry protraction has been

used as an effective treatment method in growing children with maxillary

deficiency.

The efficacy of maxillary protraction has been viewed as a result of

downward-backward displacement of mandible and compensatory dental displacement

during the treatment rather than forward-downward growth of maxilla itself.

In this study,104 subjects treated with maxillary protraction and 19 males and 21

females with known annual growth amount have been chosen longitudinally as treated

group and normal group, respectively.

And changes in position of maxilla, mandible and dentition have been

comparatively analyzed on the lateral cephalometric radiographs by age.

The results were as follows :

1. Treated group showed more forward movement of maxilla compare to the normal

group and the mandible displaced backward compare to the normal group.

2. Downward movement of maxilla in treated group was similar to that of normal

group with statistical significance in female 12 year-old group and downward

movement of mandible in treated group was similar to that of normal group.

3. In treated group, maxillary central incisor moved more forward than the normal

group with statistical significance in male 8,10 year-old groups and female 8, 9,

10 year-old groups.

In treated group, downward movement of maxil1ary central incisor was similar that

of the normal group with statistical significance in male and female 7,8 year-old

groups. Considering the above results and the duration of the treatment, the

forward movement of maxilla due to maxillary protraction was effective compared to

normal growth amount of the normal group.

[영문]

The method of treatment in skeletal Class Ⅲ malocclusion must be chosen according to an etiology and timing of the treatment. Maxillry protraction has been used as an effective treatment method in growing children with maxillary deficiency.

The efficacy of maxillary protraction has been viewed as a result of downward-backward displacement of mandible and compensatory dental displacement during the treatment rather than forward-downward growth of maxilla itself.

In this study,104 subjects treated with maxillary protraction and 19 males and 21 females with known annual growth amount have been chosen longitudinally as treated group and normal group, respectively.

And changes in position of maxilla, mandible and dentition have been comparatively analyzed on the lateral cephalometric radiographs by age.

The results were as follows :

1. Treated group showed more forward movement of maxilla compare to the normal group and the mandible displaced backward compare to the normal group.

2. Downward movement of maxilla in treated group was similar to that of normal group with statistical significance in female 12 year-old group and downward movement of mandible in treated group was similar to that of normal group.

3. In treated group, maxillary central incisor moved more forward than the normal group with statistical significance in male 8,10 year-old groups and female 8, 9, 10 year-old groups.

In treated group, downward movement of maxil1ary central incisor was similar that of the normal group with statistical significance in male and female 7,8 year-old groups. Considering the above results and the duration of the treatment, the forward movement of maxilla due to maxillary protraction was effective compared to normal growth amount of the normal group.