Bonded expander 형태에 따른 facemask의 치료 효과 비교연구
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초록
본 연구의 목적은 3급 부정교합 환자에서 facemask 치료 시 bonded expander의 치아 피개 정도에 따라 facemask의 치료 효과를 비교하고, 구강 내 장치로서의 고정원 소실 정도를 평가하는 것이다. 초기 혼합치열기에 facemask 치료를 받은 18명의 환자를 대상으로, bonded expander의 피개 범위에 따라 제1군(4개 치아 피개, 9명)과 제2군(3개 치아 피개, 9명)으로 분류하였다. 치료 전과 후 측모두부방사선사진을 촬영하여 계측치를 비교하였다. Facemask 치료 후 두 군 모두 상악 전방이동 및 하악 후하방 회전의 골격적 효과가 관찰되었고, 두 군간에 유의한 차이는없었다. 고정원 소실로서 두 군 모두 상악 구치의 근심이동이 관찰되었고, 제2군이 제1군에 비해 유의하게 큰 근심이동이 관찰되었다. 결론적으로 bonded expander의 치아 피개 범위에 따라 골격적 치료 효과에는 유의한 차이가 없었으나, 고정원으로서의소실 정도에는 차이가 있었다.
Abstract
The purpose of this study is to evaluate the effects of facemask therapy in patients with Class III malocclusionwith two types of bonded expanders covering different numbers of anchored teeth and to compare the anchoragevalue of two types of bonded expander. Eighteen subjects with Class III malocclusion in early mixed dentition were included in this study, andsubjects were divided into two groups based on the number of teeth covered by bonded expander: group 1(splinting four teeth on each side, 9 subjects) and group 2 (splinting three teeth on each side, 9 subjects). Lateral cephalograms were obtained and assessed before (T1) and after (T2) the treatment. The facemask therapy showed skeletal effects including anterior movement of maxilla and backward rotationof mandible in both groups, with no significant differences between groups. Mesial movement of maxillarymolars which indicates anchorage loss of the bonded expander was found in both groups, but significantly largermesial movement was found in group 2 than in group 1. In conclusion, the value of anchorage was different according to the number of teeth covered by bondedexpander as an intraoral anchorage of facemask, but there were no significant differences in skeletal effects.
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