• 치과방사선
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• 제12권1호
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• pp.49-56
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• 1982

The purpose of this study was to observe the anatomic variation of condylar head and the positional relationship between condylar head and other anatomic structures of head by means of cephalometry using the submentovertex cephalogram from each person in centric occlusion for producing a good quality of temporomandibular joint radiograph. The 100 submentovertex cephalograms of 100 Korean adults consisted of 50 females ranged from 20 to 24 years age and 50 males ranged from 22 to 30 years age, were studied and analyzed statistically. The results were as follows; 1. The mean of the horizontal angulation of condylar head to the transmeatal line (EE-LA) was 18.5° (S.D. 7.9°), and all measurements that indicate the horizontal angulation of condylar head showed considerable differences among individuals. 2. In the comparison of male vs. female in the measurements, statistically significant differences were found in the majority of measurement items, and with exception of R-LA and LA-LA, the rest of these measurements were larger in male than in female. 3. In the comparison of left vs. right in the measurements, statistically significant differences were found in the majority of measurement items, and with exception of PC-CC, the rest of these measurements were larger in right than in left. As above, because the majority of measurements that involve the horizontal angulation of condylar head varied among individuals, between male and female, and between left and right, the condition of various temporomandibular joint radiography should be determined by means of cephalometry using the submentovertex cephalogram for producing the accurate radiographic image of temporomandibular joint.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제33권4호
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• pp.323-330
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• 2011

Purpose: The present study examined the reproducibility of an operation plan by comparing the jaw position of STO with the postoperative mandibular set back measurement in sagittal split ramus osteotomy. Methods: Thirty patients with class III dental and skeletal malocclusion and who were treated with BSSRO were reviewed. Three plain radiographs such as the panoramic view, the lateral cephalogram and the submentovertex view were taken before and after operation. Also, paper surgery for STO and model surgery were used to evaluate the amount of mandibular set back. Results: On the panoramic view, the amount of mandibular set back in STO was similar to the postoperative results of model surgery, but the amount of mandibular set back on the lateral cephalogram was smaller than the postoperative result of model surgery and then the amount of set back on submentovertex view was similar to the postoperative result of model surgery. Conclusion: Precise tracing and paper surgery should be performed for a combined expected STO in order to predict the exact amount of preoperative mandibular set back.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제30권5호
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• pp.359-367
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• 2004

Purpose: After the surgical correction with sagittal split ramus osteotomy, the position of the mandibular condyle in the glenoid fossa and the proximal segment of the mandible change because of bony gap between proximal and distal segment, especially in case of mandibular setback asymmetrically. In this study, positional changes in the condyle and proximal segment after BSSRO were estimated in the mandibular asymmetry patient by analyzing the in submentovertex view and P-A cephalogram for identification of ideal condylar position during surgery. Patients and Methods: The 20 patients were selected randomly who visit Dankook Dental Hospital for mandibular asymmetry. Bilateral sagittal split ramus osteotomy with rigid fixation was performed and P-A cephalogram and submentovertex view was taken at the time of preoperative, immediate postoperative, 3 month postoperative period. Results: Intercondylar length and transverse condylar angle was increased due to inward rotation of proximal segment and anteromedial rotation of lateral pole of condyle head. The condylar position had a tendency to return to the preoperative state and after 3 months return up to about half of the immediate post-operative changes, and all the results showed more changes in asymmetry patient and deviated part of the mandible. Conclusion: Based on all these results above, surgeon should make efforts to have a precise preoperative analysis and to have a ideal condylar position during rigid fixation after BSSRO.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제29권1호
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• pp.26-34
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• 2003

Intraoral Vertical Ramus Osteotomy,along with Sagittal Split Ramus Osteotomy,is an popular surgical technique performed on mandibular prognathism. However Intraoral Vertical Ramus Osteotomy has been suspected for an initial mobilization at the healing phase of segment because it does not employ the rigid fixation between segments. To execute a study on the healing phase of segment after Intraoral Vertical Ramus Osteotomy on the horizontal plane, 102 patients (204 parts) who were diagnosed mandibular prognathism and took Intraoral Vertical Ramus Osteotomy at the Yonsei University dental hospital were observed during the period of before operation, immediately postoperation, 1 month, 3 months, 6 months, and 12 months. The change in the width of segment and horizontal angle of proximal segment and condylar head on the Submentovertex Cephalogram taken from those patients represented following results. 1. The width of proximal and distal segment decreased with the lapse of time. It decreased into 84.5% between immediate postoperative and 6M and even continued to decrease till 12M. 2. The horizontal angle of the proximal segment did medial rotation according as the lapse of time and rigorously continued till 3M. The rotation angle of condylar head indicated its tendency of recurrence to the original position but the entire recurrence was not allowed. The bigger an initial angle was, the higher was the tendency of recurrence after the operation while the rotation angle remained still bigger. 3. After grouping into group 1, group 2,and group 3 based on the extent of the variation of rotation angle of condylar head at immediate postoperative, the variation of rotation angle was measures in each group. The result presented that the initial rotation angle of condylar head had correlation with that of proximal segment but had no relation with the extent of setback of the mandible. However a quantitative analysis alone is not a sufficient method for analyzing the healing phase of segment on the horizontal plane.Therefore a multilateral analysis using 3 dimensional data such as CT is recommendable for the future study.

• 치과방사선
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• 제20권2호
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• pp.201-210
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• 1990

The purpose of this study was to observe the relationship between mandibular asymmetry and Temporomandibular Disorders by means of the cephalometry using the posteroanterior cephalogram and the submentovertex cephalogram which were taken in 35 Temporomandibular Disorder patients and 35 normal persons ranged from 20S to 30S. The results were as follows: 1. The angulation which was formed by the median line with the ANS-Menton line (MAP) was greater in patients group and there was statistically significant difference. 2. The angulation which was formed to the median line with the Menton-Odontoid process tip line (MES), the difference of the distances from the center of the posterior surface of the both condyles to the most anterior point of the chin (DD), the difference of the distances from the center of the both condyles to the horizontal reference line (DE), the difference of the angulations which were formed by the both condyles axes with the horizontal reference line (DCE), the difference of the lengths of the both condyles (CL) and the difference of the widths of the both condyles (DW) were greater in patients group and there were statistically significant differences. There was reversed correlation between MAP and the difference of the distances from the 3. bilateral points of the lateral margin of the both zygomaticofrontal sutures to the at the lateral inferior margin of the both antegonial protuberances in mandible (DH). There was reversed correlation between MES and DD, DE, DCE. 5. There was correlation between MAP and MES.

• 대한치과교정학회지
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• 제26권4호
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• pp.414-420
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• 1996

방사선 사진상에서의 계측치 자체가 이차원적인 면만을 나타낼수밖에 없어 실제 삼차원적인 구조물인 두개안면부위의 특징을 정확히 묘사하기는 어려움이 있다. 이에 따라 한 평면과 다른 평면을 연계시켜 보다 3차원적인 측면의 많은 연구가 시행되어져 왔으며, 이들 두 평면간의 상호연관성에도 관심이 모아지고 있다. 본 연구에서는 부정교합과 밀접한 영향을 가질뿐 아니라, 성장의 변화를 예측할수 있게하고 치료방법,예후 결정등에 중요한 영향을 미치는 안모유형지수와 이하두정 방사선 사진상에서의 여러 계측치간의 상호연관성을 평가하여 보았다. 골격성 ClassI의 양호한 안모를 가진 성인을 대상으로 측모두부방사선사진 이하 두정 방사선계측사진을 촬영하여 이들간의 상관관계를 알아보아 다음과 같은 결론을 얻었다. 1. 과두의 평균경사도에 영향을 주는 요소를 알아보기 위해 FACE,INT-CO-ANG, MN-CORPUS, CON-RATIO, GON-RATIO, MN-RATIO, MX-RATIO를 변수로하여 다중회귀분석 결과, 아래의 회귀 방정식을 얻었다. CON-AVE는 .173(FACE) -0.322 (INT-CO-ANG) +36.34 (GON-RATIO)+0.420(MN-CORPUS)로 나타났다($R^2=.85451$) 2. 안모유형지수에 대해선 아래의 희귀방정식을 얻었다. FACE=.050(CON-ANG)+.023(INT-CO-ANG)-.075(MN-CORPUS) ( 2. 안모유형지수에 대해선 아래의 희귀방정식을 얻었다. FACE=.050(CON-ANG)+.023(INT-CO-ANG)-.075(MN-CORPUS) ($R^2=.31547$) 3. 이하두정 방사선사진상의 계측치들중 MN-CORPUS, CON-RATIO, GON-RATIO, MN-RATIO, MX-RATIO는 서로 밀접한 상관관계를 보였다.(P<0.05) 4. 하악과두의 평균경사도는 우측에선 $23.67^{\circ}$, 좌측에선 $20.71^{\circ}$로 나타났고, 좌,우측값에서 차이를 보이고 있다. FACE : 안모 유형지수. CON-ANG : 하악과두경사도의 평균값. CON-AVE : 좌,우 하악파두경사도의 평균값. INT-CO-ANG : 좌,우 하악과두장축이 이루는 각도. MN-CORPUS : 좌,우Gonion에서 Pog.까지 이은 선에 의해 형성되는 각도. CON-RATIO: intercondylar distance/mandibular body length. GON-RATIO: intergonion distance/mandibular body length. MN-RATIO : intermylohyoid distance/mandibular body length. MX-RATIO: intermaxillary tuberosity distance/ANS-PNS distance.