하악 전돌증 환자의 하악전치부 순측 치조골

형태에 관한 방사선학적 연구

김   점   숙

전남대학교 대학원 치의학과

(지도교수: 배정식)

(초록)

하악 전돌자에서의 치은 퇴축 발생 소인을 알아보기 위하여 20세 전후의 악교정수술을 요하는 하악전돌자와 비슷한 연령대의 정상 교합자를 대상으로 측모두부방사선사진과 하악전치부의 단층 촬영사진을 사용하여 순측 치조골 계측치를 비교 연구한 바 다음과 같은 결과를 얻었다.

1. 하악 전돌자의 순측 치조골 피질판의 단면적은 정상군보다 의미있게 작았다.

2. 하악 전돌자의 치조정은 정상군에 비하여 낮은 것으로 나타났다.

3. 순측 치조골판의 면적은 백아법랑경계에서 치조정까지의 거리와는 역상관관계를, 치조정에서 치근단까지의 거리와는 순상관관계를 보였다.

4. 하악전돌자에서 IMPA의 증가는 symphysis의 두께와 순상관관계를, 치조골의 높이와는 역상관관계를 보였다.

이상의 결과에서 골격성 하악전돌자는 변연부 순측 치조골이 정상교합자보다 작음으로 치은 퇴축 발생가능성이 큼을 시사하였다.

A Radiological Study on the Morphology of Labial Alveolar Bone in the Mandibular Incisor Area of Mandibular Prognathism Patients

Jeom-Sook Kim

Faculty of Dental science, Chonnam National University

Graduate School

(Directed by associated professor Hyeon-Shik Hwang)

(Abstract)

This study was concerned with comparing the measured values of labial alveolar bone through the lateral cephalometric radiography and mandibular incisor cross-sectional tomogram between two groups, one group of mandibular prognathism patients who needed an orthognathic surgery as an experimental group and the other group who had normal molar relationships as a control group. The purpose of the study was to find out the predisposing factors of bone resorption and gingival recession before orthodontic treatment.

The results were as follows:

1. The cross-sectional area of labial alveolar bony plate in mandibular prognathism was    significantly smaller than that of control group.

2. In mandibular prognathism, the distance between cementoenamel junction and alveolar    crest was significantly greater than control group.

3. There were negative correlations between area of labial alveolar bony plate and         distance from cementoenamel junction to alveolar crest, and positive correlations         between area of labial alveolar bony plate and distance from alveolar crest to root       apex.

4. In mandibular prognathism, there were positive correlations between IMPA and          thickness of symphysis, and negative correlations between IMPA and the alveolar        bony height.

The results of the present study suggest the mandibular prognathism patients are prone to the gingival recession due to the small amount of labial alveolar bone around lower incisors.