• Maxillofacial Plastic and Reconstructive Surgery
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• 제33권3호
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• pp.218-224
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• 2011

Purpose: The purpose of this study is to evaluate the post-operative skeletal stability after surgical correction of patients with mandibular prognathism by bilateral sagittal split ramus osteotomy (BSSRO) and to evaluate the horizontal relapse tendency after the surgery. Methods: Twenty-six patients with Class III dental and skeletal malocclusion were selected for this retrospective study. Fifteen of them underwent BSSRO for mandibular setback and eleven of them underwent two-jaw surgery (Lefort I and BSSRO). In each patient, lateral cephalometric radiographs were taken pre-operatively, post-operatively within 1 week, and post-operatively after eight months. After tracing of the cephalometric radiographs, various parameters were measured. The analyses were done by linear measurement to evaluate the change in position of hard tissue B point, pogonion and mandibular plan angle by examination on lateral cephalograms. Results: The horizontal relapse rate was 27.1% at B point and 31.6% at pogonion in patients who underwent BSSRO. The horizontal relapse rate of the group where the amount of correction exceeded 10 mm was 25.69% at B point. Conclusion: There were no statistical differences on the magnitude of setback and direction of rotation of the mandible in mandibular stability. There were also no statistical differences between single mandibular surgery and two-jaw surgery for mandibular stability.

• The Journal of Advanced Prosthodontics
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• 제6권6호
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• pp.483-490
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• 2014

PURPOSE. The purpose of this study was to determine the average facial proportions and mandibular movement capacity of 316 first-year dental students who carefully recorded them on each other. MATERIALS AND METHODS. This early exacting clinical experience was closely supervised by the authors in Columbus, Ohio during 1969-70. Five vertical and six horizontal distances were measured on each subject's face. An ala-tragus line and an occlusal line were drawn on the left side of the face to determine if these two lines were parallel. Measurements of mandibular movements involved maximum normal and hinge opening at the incisors and maximum amounts of right, left lateral and protrusive excursions of the mandible. RESULTS. The ala width and distance between the tips of upper right and left canine cusps averaged (35.2 mm and 34.8 mm) but with very large individual variations. The distance between ala to occlusal plane lines was 29.9 mm at the tragus and 31.3 mm near the ala. The angle between orbitale and ala-tragus averaged 13.6 degrees. CONCLUSION. The upper lip length was the most variable and the distance between the pupils was the most stable of the eleven facial measurements. The ala-tragus line and the occlusal plane lines were for all practical purposes parallel. Maximum jaw opening averaged 51.2 mm which was 3.0 times larger than maximal hinge opening of 17.2 mm. The maximum right plus left side jaw excursions (9.2 and 9.4 mm) totaled 18.6 mm, 2.3 times more than the 8.0 mm mean maximum forward protrusion.

• 대한치과교정학회지
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• 제43권1호
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• pp.42-52
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• 2013

The aim of this paper was to propose a new method of bimaxillary orthognathic surgery planning and model surgery based on the concept of 6 degrees of freedom (DOF). A 22-year-old man with Class III malocclusion was referred to our clinic with complaints of facial deformity and chewing difficulty. To correct a prognathic mandible, facial asymmetry, flat occlusal plane angle, labioversion of the maxillary central incisors, and concavity of the facial profile, bimaxillary orthognathic surgery was planned. After preoperative orthodontic treatment, surgical planning based on the concept of 6 DOF was performed on a surgical treatment objective drawing, and a Jeon's model surgery chart (JMSC) was prepared. Model surgery was performed with Jeon's orthognathic surgery simulator (JOSS) using the JMSC, and an interim wafer was fabricated. Le Fort I osteotomy, bilateral sagittal split ramus osteotomy, and malar augmentation were performed. The patient received lateral cephalometric and posteroanterior cephalometric analysis in postretention for 1 year. The follow-up results were determined to be satisfactory, and skeletal relapse did not occur after 1.5 years of surgery. When maxillary and mandibular models are considered as rigid bodies, and their state of motion is described in a quantitative manner based on 6 DOF, sharing of exact information on locational movement in 3-dimensional space is possible. The use of JMSC and JOSS will actualize accurate communication and performance of model surgery among clinicians based on objective measurements.

• 대한치과보철학회지
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• 제61권1호
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• pp.63-72
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• 2023

완전 무치악에서 전악 임플란트 고정성 수복물로 구강회복 치료를 진행할 경우, 해당 악궁의 해부학적 상황과 대합치와의 관계를 고려하여 최종 보철물의 형태와 위치를 결정하는 과정과 이에 따라 다수의 임플란트를 계획된 방향과 각도로 식립하는 과정은 매우 중요하다. 본 증례는 기존 의치의 불편감으로 내원한 상악 무치악 환자를 computer-guided surgery를 통해 상부 보철물에 기반하여 이상적으로 계획된 위치에 임플란트를 식립하였다. 이를 통해 상악 전악 임플란트 고정성 보철물을 제작하여 구강 회복을 진행한 치료로 환자와 술자 모두 기능 및 심미적으로 만족할만한 결과를 얻었기에 이를 보고하고자 한다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 춘계학술대회 및 창립 30주년 심포지엄(논문집)
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• pp.355-360
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• 2006

컨테이너 크레인용 쐐기형 레일클램프에서 조 패드의 초기 압착력은 라커의 물림각 설정 후 라커를 체결 시 주요 부품의 변형량에 의해서 결정된다. 이때 여러 인자들로 인해 쐐기 프레임의 저항력이 발생하게 되면, 인장봉의 변형을 감소시켜 초기 압착력 설정을 위한 라커의 물림각이 변하게 된다. 이러한 쐐기 프레임의 저항력은 롤러와 쐐기사이의 편심거리와 쐐기 프레임과 외곽 프레임 사이의 틈새에 따라 결정된다. 본 연구에서는 초기압착단계에서 인장봉에 전달되는 인장력을 실험을 통하여 측정함으로써 쐐기 프레임의 저항력이 라커의 쐐기형 레일클램프의 압착력에 미치는 영향을 평가하고자 한다.

• The Korean Journal of Physiology
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• 제3권1호
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• pp.33-44
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• 1969

Electoromyographic studies were performed on the action of the muscles of the temporomandibular joints following exfoliation of the deciduous teeth. The subjects examined, being 50 children. between the age of 6 and 13 years, divided into 5 groups. They were; 1) Deciduous dentition were complete in the first group. 2) Deciduous incisors were missing in either upper or lower jaw in the second group. 3) Deciduous canine and molars were missing in the left side of either upper or lower jaw in the third group. 4) Deciduous canine and molars were missing in the right side of either upper or lower jaw in the fourth group. 5) Permanent dentition completed in the fifth group(except third molars). Electromyogram was recorded with 4 channel polygraph (Grass model VII modified for 7P3). Electrodes which were the cup-typed gold discs, 9 millimeters in the diameter, were located on the anterior, middle and posterior lobes of the temporal muscles, and also on the superficial and deep layers of the masseter muscles. Paired electrodes were held by electrode cream so that they were pressed on the skin surface at right angle, adhesive tape being used to anchor them. The distance of the pair electrodes was about 5 millimeters. The results obtained were as follow: 1) In rest position of mandible; All groups showed slight, electrical activities in the muscles involved, but in the middle lobe of temporal muscle they were slightly higher. 2) In molar occlusion of mandible; High activity-anterior lobe of temporal muscle and superficial layer of masseter muscle. Moderate activity-deep layer of masseter muscle. Low activity-middle and posterior lobes of masseter muscle. There were no differences among the first, the second and the fifth groups. In the third group the muscle activity was weaker than that of the right, and in the fourth group opposite characteristics was revealed. 3) In incisal bite of mandreble; Hight activity-superficial layer of masseter muscle. Modertae activity-deep layer of masseter muscle. Low activity-anterior, middle and posterior lobes of temporal muscle. The first, the third, the fourth and the fifth groups showed no differences but the second group showed less activity than those of others. 4) In protrusion of mandible; High activity-deep layer of masseter muscle Moderate activity-superficial layer of masseter muscle. Low activity-anterior, middle and posterior lobes of temporal muscle. In the first, the fourth and the fifth groups, there were no differences in the activities, but the second group showed less activity than the others. 5) In retrusion of mandible; High activity-deep layer of masseter muscle. Moderate activity-superficial layer of masseter muscle. Low activity-anterior, middle and posterior lobes of temporal muscle. In the first, the third, the fourth and the fifth groups, there were no differences but the second group showed less activity than the others. 6) In lateral excursion of the mandible (either direction); High activity-posterior lobe of temporal muscle. Moderate activity-anterior and middle lobes of temporal muscle. Low activity-superficial and deep layers of masseter muscle. The muscle action potentials were weaker than those of the right side in the third group and vice ver'sa in the fourth group. 7) In chewing movement; Temporal muscle activities were higher than those of masseter, especially in the middle lobe of temporal muscle the activity was highest. Right side muscle activities were higher than those of the left in the third group and, on the contrary, the left side was dominant over the right in the fourth group.

• Radiation Oncology Journal
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• 제14권4호
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• pp.323-332
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• 1996

목적 : 방사선 치료에 있어서 조직내 등선량 분포곡선을 변형시킬 목적으로 쐐기 차폐물이 사용되고 있는데 최근 기존의 고정 쐐기와는 다르게 비대칭적인 콜리메이터인 Independent Jaw에 의해 등선량 분포곡선을 변형시키는 동적 쐐기 기법이 실용화 되고 있으나 아직 그 방사선 물리학적인 특성에 대해서는 잘 알려져 있지 않다. 이에 본 저자는 기존의 고정 쐐기와 비교하여 조직내 방사선량 분포의 특성을 알아보고자 본 연구를 계획하였다. 대상 및 방법 : 물 판톰, 폴리 스타이린 판톰, 평균 유방 모형 판톰을 대상으로 전리함, 필름, TLD 등을 이용하여 동적 쐐기와 고정 쐐기의 선량 분포를 측정하여 비교하였다. 방사선원은 선형 가속기의 6MV x선을 사용하였고 $15{\times}15$ 조사면에서 15, 30, 45도 쐐기를 이용하였다 조직내선량 분포는 전리함과 필름 선량계를 사용하였고, 유방 접선 치료방식에서의 반대편 유방 조사선량은 TLD를 사용하였다. 결과 : 1) 조직내 $\%$심도 선량은 고정 쐐기의 경우 심도 선량 깊이가 깊어지는 방사선의 경화 현상이 뚜렷하였으나 동적 쐐기의 경우에는 발견할 수 없었으며 그 $\%$심도선량은 개방 조사면과 유사하였다. 2) 조직내 등선량 분포 곡선을 보면 동적 쐐기의 경우 고정 쐐기와는 달리 원하는 깊이, 원하는 조사면에서 원하는 쐐기 각도를 얻을 수 있었으며 쐐기 각도를 이루는 등선량 분포 곡선이 고정 쐐기에 비해 더욱 직선적이었다. 3) 산란선량은 동적 쐐기의 경우 개방 조사면과 그 양이 거의 동일하였으며 유방보존술에서의 접선 조사방식의 방사선치료에서 고정 쐐기 대신에 동적 쐐기를 사용함으로써 반대측 유방으로의 피폭선량을 감소시킬 수 있었다. 결론적으로 동적 쫴기 기법은 단순히 고정 쐐기를 대체할 수 있을 뿐만 아니라 고정 쐐기의 단점을 보완해 줄 수 있으며 향후 방사선 치료에 있어서 더 다양한 유용성을 가질 수 있으리라 생각한다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제32권6호
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• pp.566-574
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• 2006

Purpose : This study was performed to provide an anatomical information of the mandibular ramus for the successful inferior alveolar nerve block. Three dimensional images were reconstructed from the computerized tomography (CT) and the anatomical evaluation of the mandibular ramus was done. Materials and methods : Sixty-four patients who had been taken the facial CT scans from 2000, Jan to 2003, June was selected. The patients who had the anterior or posterior teeth misssing, edentulous ridge, and jaw fracture were excepted. In the occulusal plane, the lingual surface angle (LSA) between the mid-sagittal plane and the mandibular molar lingual surface from the 2nd premolar to the 2nd molar, the inner ramal surface angle (IRSA), the maximum inner ramal surface angle (MxIRSA), and the outer ramal surface angle (ORSA) to the-mid sagittal plane were measured. The inner ramal surface angle in the ligular tip level (IRSA-L) and the outer ramal surface angle in the ligular tip level (ORSA-L), the ramal length (RL), and the anterior ramal length (ARL) were also measured in the lingular tip level. Results : In the lingular tip level, the mean IRSA-L and ORSA-L were $28.6{\pm}6.3^{\circ}$ and $17.9{\pm}4.9^{\circ}$ respectively. The larger was the IRSA, the larger was the ORSA. In the lingular tip level, the mean ramal length was 35.8${\pm}$3.4 mm. The larger was the IRSA-L, the shorter was the ramal length. On the lingular tip level, the mean anterior ramal length from anterior ramus to lingular tip was 19.6${\pm}$3.3 mm. when the ramal length was longer, the anterior ramal length was also longer. On the lingular tip level, there was positive correlation vetween the IRSA and the ORSA, negative correlation between the IRSA and the ramal length, and positive correlation between the ramal length and the lingular tip level to the anterior ramus. There was no statistical meaning of data between sex and age. Conclusion : In the clinical view of the results so far achieved, if the direction of needle is closer to posterior it is able to contact bone on lingular tip when the internal surface of ramus is wided outer.

• 대한치과교정학회지
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• 제27권1호
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• pp.45-54
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• 1997

본 연구의 목적은 bionator를 사용한 II급 1류 부정교합 환자의 치료후 결과를 토대로 치료전에 치료후 결과를 예측할 수 있는 항목들을 알아봄으로써 성장하는 II급 1류 부정교합을 가진 환자들의 치료에 도움을 얻는데 있다. bionator를 사용한 앵글 II급 1류 부정교합 환자 48명의 치료후 두부방사선계측사진을 통해 치료결과가 양호한 군(1군)과 치료결과가 불량한 군(2군)으로 나눈 후 양군의 치료전 측모두부방사선계측사진의 비교분석을 통해 두군 사이에 차이를 보이는 계측항목들을 알아보았고, 판별분석을 통해 다음의 결과를 얻을 수 있었다. 1. 치료전 골격계측 항목으로는 ANB, facial convexity angle, AB to facial plane angle 등이, 치성계측 항목으로는 L1 to A-Pog, U1 to facial plane, L1 to facial plane 등이, 연조직 계측항목으로는 Ricketts esthetic line 상에서 상, 하순의 돌출도가 양군 사이에 유의한 차를 보였다(SAS t-test, p<0.05). 2. 판별분석을 통해 유의성있게 나타나는 항목의 순위를 본 결과 L1 to facial plane, 하순의 돌출도, ANB과 FMIA 등이 양군의 치료결과의 예측에 도움을 주는 것으로 나타났다. 3. 증감판별분석을 통해 서로 독립적이며 상관계수가 높은 3개의 변수 - L1 to facial plane, articular angle, ANB- 를 선택하였으며, 이를 토대로 판별식을 도출하였다.

• 대한치과교정학회지
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• 제30권3호
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• pp.297-306
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• 2000

최대 개구운동시 하악골의 개구능력과 과두의 활주 운동 양상을 관찰하고 두개안면골격 형태요소와의 상관성을 알아보기 위해 경희의료원 교정과에 내원한 10세 전후의 아동 68명의 최대감합위 및 최대개구위 측모두부방사선사진을 분석하고 통계 처리하여 다음과 같은 결론을 얻었다. 1. 최대개구량의 평균치는 47.1mm, 최대개구운동시 과두의 이동 직선거리는 18.1mm, 과두의 수평 이동거리는 17.5mm, 수직이동거리는 3.8mm였으며 이동경사도는 $13.1^{\circ}$이었다. 2. 전방두개저의 길이, 하악골 및 상악복합체의 전후방적인 길이가 길수록, 하악상행지가 전방으로 경사할수록, 후안면 고경이 크고 하악의 경사도가 작을수록 개구량이 컸다. 3. 하악상행지가 직립된 경사도를 가질수록, 하악골의 만곡도가 클수록 과두는 수직적인 활주운동을 하였다. 4. 상악복합체가 전후방적으로 길수록 과두는 전방으로 길게 활주운동을 하였다. 이상의 내용으로 볼 때 최대개구위 측모두부방사선사진은 부정교합 환자의 개구운동시 하악골의 운동양상을 평가할 수 있는 진단 자료로서 유용하며 하악골의 개구운동 양상은 두개안면골격의 특정한 형태적 요소와 연관성을 가지며 악관절의 기능적 해부 형태에 관한 정보를 제공하는 것으로 사료된다.