상악 구치부 회전양상의 평가 = The evaluation of rotational movements of maxillary posterior teeth using three dimensional images in cases of extraction of maxillary first premolar

국문 초록 (Abstract)

측모두부방사선사진의 중첩만으로는 교합평면상의 치아이동을 알 수 없으며, occlusogram 역시 촬영 및 중첩의 오류를 피할 수 없다. 본 연구는 석고모형의 3차원 영상을 촬영한 후 3차원 영상 소프트웨어를 이용하여 중첩된 영상을 통해 상악 소구치 발치공간 폐쇄 후 상악 구치부 회전양상을 알아보고자 하였다. 성인여성 19명을 연구대상으로 하여 치료 전 석고모형 및 치료 완료후 석고모형의 3차원 영상을 촬영한 후, 상악 경구개면을 기준으로 두 영상을 중첩한 다음, 치료 전후의 상악 구치부의 회전양상을 비교 분석하였다. 연구결과, 구치부의 회전 양상은 매우 다양하였다. 그 주요 원인은 치료 전 상악 구치의 다양한 회전 상태와 치열궁 및 치아의 형태학적인 특성 때문인 것으로 추측되었다. 따라서 발치공간 폐쇄 시 일어나는 구치의 회전 양상을 3차원 영상을 이용하여 정확히 평가하기 위해서는 치료 전후에 일어나는 구치의 회전을 초기 배열 전후의 구치 회전, 발치공간 폐쇄 전후의 구치 회전, 그리고 마무리 단계 전후의 구치 회전으로 세분하여 평가해야 함을 알 수 있었다.

다국어 초록 (Multilingual Abstract)

Cephalometric superimposition is unable to evaluate tooth movement along the occlusal plane and the errors of photographing and superimposition of the occlusogram is also inevitable. The purpose of the present study was to evaluate the rotational movements of the maxillary posterior teeth following space closure after extraction of maxillary first premolars, using 3D dental images. In 19 adult females, analysis of rotational movements of the maxillary posterior teeth was performed between the initial and final 3D dental images superimposed on the maxillary hard palate. The results showed a diversity of rotational movements of posterior teeth. The causes of various rotational movements may be different rotation of molars in each case at the beginning of treatment. individual characters of the dental arch and tooth morphology. The results of the study indicate that accurate evaluation of retational movements of posterior teeth following space closure after extraction of premolars using 3D dental images can be obtained through the subdivision of tooth movement during the initial aligning, space closure and finishing stages.

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