• Title/Summary/Keyword: Mandibular osteotomy

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A CASE REPORT OF SURGICAL CORRECTION OF NASOMAXILLARY HYPOPLASIA DUE TO CONGENITAL SYPHILIS BY LE FORT II OSTEOTOMY WITH CORONAL APPROACH (선천성 매독에의한 비상악골 부전증환자의 관상두피 접근법에 의한 Le Fort II 골절단술을 이용한 치험례)

  • Um, In-Woong;Kim, Chang-Soo
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.13 no.1
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    • pp.88-94
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    • 1991
  • Maxillofacial deformities are not considered to be a trouble in social life but function. So many maxillofacial plastc surgeons has made efforts to overcome these troubles and bring out more positive life. The proper proportion and shape decide esthetic quality. Lower third of face was consist with lip, cheek, mandibular lower border and mandibular angle. Widening lower third of face give a impression with muscular and recklessness. And lower and wide mandibular angle makes face square shape. Unilateral involvement cause asymmestric face. These face is considered unfavorable, especially in Korea or Japan. We prevent a number of with mandibular angle Bulging which was corrected with mandibular osteotomy or masseter myotomy.

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Initial Stability after Bilateral Sagittal Split Ramus Osteotomy Application in Patients with Mandibular Prognathism (하악골 전돌증 환자에서 하악지 시상분할골 절단술 적용술 후 초기 안정성 평가)

  • Kwon, Myung-Hee;Leem, Dae-Ho;Baek, Jin-A;Shin, Hyo-Keun;Ko, Seung-O
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.33 no.3
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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.

A STUDY ON CHANGE OF THE SOFT TISSUE FACIAL PROFILE AFTER ORTHOGNATHIC SURGERY IN PATIENTS WITH THE MANDIBULAR PROGNATHISM (하악전돌증 환자의 악교정 수술후 시간경과에 따른 안모 연조직 변화에 관한 연구)

  • Shin, Min-Cheol;Lee, Sang-Chull
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.19 no.4
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    • pp.351-361
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    • 1997
  • This study was performed to evaluate the change of the soft tissue facial profile after mandibular set back surgery during time intervals. For this study, 33 patient, 8 males and 25 females, were selected and their lateral cephalograms were taken and analyzed periodically. Hard and soft tissue changes during postoperative time intervals, correlation between surgical skeletal changes and postoperative soft tissue changes, and prediction for long-term soft tissue changes were established through varying statistical methods. The results were as follow : 1. There were meaningful changes of anteroposterior skeletal position at 6 months and 2 years after mandibular set back by mandibular ramus osteotomy. Two years postoperatively, there was 30%, 32%, 29% relapse on B point, pogonion, menton each. 2. Two years after the mandibular ramus osteotomy, the relative changes of the soft tissue to their osseous counterparts showed 76% on the lower lip and 91% on the pogonion. 3. The movements of the mandibular landmarks in correlation to anteroposterior position of the lower lip and soft tissue of the chin showed to be effective on a long-term basis. 4. Using surgical changes of pogonion, prediction of changes in soft and hard tissue pogonion was useful and the coefficient of determination was 0.46 each and their reliability decreased 2 years postoperatively. 5. The upper lip position after the mandibular set back surgery was somewhat anterior 2 years postoperatively, but that has no statistical meanings.

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A CEPHALOMETRIC STUDY OF PROFILE CHANGES FOLLOWING ORTHOGNATHIC SURGERY IN PATIENTS WITH MANDIBULAR PROGNATHISM (하악전돌증환자의 악교정수술후 안면측모 변화에 관한 두부방사선 계측학적 연구)

  • Lee, Hyung Sik;Park, Yung Chael
    • The korean journal of orthodontics
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    • v.17 no.2
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    • pp.299-310
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    • 1987
  • The purpose of this study was to examine soft tissue and hardtissue changes following orthognathic surgery in patients with mandibular prognathism lateral cephalometric films were obtained immediate before surgery, 48 hours following surgery, and 6 months following surgery. 18 patients were selected (10 men, and 6 women) for this study, who had received orthognathic surgery. Statistical analysis for the each time interval differences were performed with the SPSS package The results were as follows, *In the cases of mandibular sagittal split osteotomy 1 LI point was moved backward (average 7.55mm) 48 hours following surgery. 6 months later, it was returned forward (average 1.1mm) Relapse rate was 14.6% 2 Pog was moved backward (average 8.3mm) 48 hours following surgery The ratio of horizontal change of soft tissue to hard tissue at pog is 0.95 1 *In the cases of maxillary Le-Fort I osteotomy & mandibular sagittal split osteotomy. 3. A point was moved forward (average 3.31mm) 48 hours following surgery. 6 months later, it was returned backward (average 0.31) Relapse rate was 9 4% 4 6 months later, the ratio of facial convexity angle change of soft tissue to hard tissue is 0.63 1.

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Soft tissue changes in skeletal class II patients treated with bilateral sagittal split osteotomy advancement surgery (골격성 II 급 부정교합 환자의 하악골 전진술 후 연조직 변화 분석)

  • Shin, Hee-Jin;Kim, Jin-Wook;Park, Je-Uk
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.36 no.2
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    • pp.94-99
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    • 2010
  • The purpose of this study was to examine the soft tissue changes in skeletal class II patients after mandibular advancement by bilateral sagittal split ramus osteotomy (BSSRO). In Asian population, the incidence of skeletal class II malocclusion is lower than that of skeletal class III malocclusion unlike the caucasians. This study was conducted to figure out the ratio at which hard tissue and soft tissue changes after mandibular advancement by analyzing cephalograms of 13 patients that have undergone the mandibular advancement surgery. As a result, change ratios of Li, B', Pog' according to the movement of li, B, Pog were found to be 0.59, 1.06, 0.82. Also, vertical height of vermilion zone (Si-Vb) and lower lip and chin (Si-Me') were measured to evaluate vertical changes. Vermilion zone showed tendency to decrease by 1.02 mm on the average postoperatively, whereas vertical length of lower lip and chin showed tendency to increase by 3.57 mm on the average.

COMBINED ORTHODONTIC-SURGICAL TREATMENT FOR CLASS III PATIENT WITH MIDFACIAL DEFICIENCY AND MANDIBULAR PROGNATHISM (중안면부 함몰과 하악전돌을 동반한 III 급 부정교합자의 교정-악교정수술 복합치료)

  • Cho, Eun-Jung;Kim, Jong-Tae;Yang, Won-Sik
    • The korean journal of orthodontics
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    • v.26 no.5 s.58
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    • pp.637-645
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    • 1996
  • In non-growing Class III malocclusion, the critical aspects which determine the need of orthognatic surgery are the severity of skeletal discrepancy, incisor inclination, overbile and soft tissue profile. Two-jaw surgery is more effective in correcting severe sagittal, vertical, transverse skeletal discrepancies and facial asymmetry. And more esthetic and stable profile can be achieved by two-jaw surgery Some midfacial deficiency Patients can be treated by Pyramidal Le Fort II osteotomy to maintain infraorbital rim and malar complex and to advance nasomaxillary complex. Others who require advancement of infraorbital rim and malar complex can be treated by quadrangular Le Fort II osteotomy. On the following cases, patients who had represented midfacial deficiency and mandibular prognathism were treated with combined orthodontic-surgical therapy by Le Fort II osteotomy and BSSRO.

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Prediction of Amount of Mandibular Set Back with 3 Plain Radiographs in Mandibular Sagittal Split Ramus Osteotomy (하악상행지 시상분할골절단술 시 하악후퇴량의 방사선학적 예측)

  • Noh, Lyang-Seok;Kim, Jin-Wook;Kwon, Tae-Geon;Lee, Sang-Han
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.33 no.4
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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.

Unilateral bimaxillary vertical elongation by maxillary distraction osteogenesis and mandibular sagittal split ramus osteotomy: a case report (상악 골신장술과 하악 상행지시상분할술을 이용한 편측 상하악골 수직 증가술: 증례보고)

  • Jung, Young-Eun;Yang, Hoon-Joo;Hwang, Soon-Jung
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.37 no.6
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    • pp.539-544
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    • 2011
  • Maxillary canting and vertical shortening of the unilateral mandibular ramus height is common in cases of severe facial asymmetry. Normally, mandibular distraction osteogenesis (DO) with horizontal osteotomy at the ascending ramus is used for vertical lengthening of the mandibular ramus to correct facial asymmetry with an absolute shortened ascending ramus. In this case report, vertical lengthening of the ascending ramus was performed successfully with unilateral DO and sagittal split ramus osteotomy (SSRO), where the posterior part of the distal segment can be distracted simultaneously in an inferior direction with maxillary DO, resulting in a lengthening of the medial pterygoid muscle. This case describes the acquired unilateral mandibular hypoplasia caused by a condylar fracture at an early age, which resulted in abnormal mandibular development that ultimately caused severe facial trismus. The treatment of this case included two-stage surgery consisting of bimaxillary distraction osteogenesis for gradual lengthening of the unilateral facial height followed by secondary orthognathic surgery to correct the transverse asymmetry. At the one year follow-up after SSRO, the vertical length was maintained without complications.

Surgical treatment for dysesthesia after overfilling of endodontic material into the mandibular canal (하치조신경관으로 과충전된 근관치료 충전재에 의한 감각이상의 외과적 처치)

  • Song, Jae-Min;Kim, Yong-Deok;Lee, Jae-Yeol
    • The Journal of the Korean dental association
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    • v.54 no.11
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    • pp.874-879
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    • 2016
  • Damage to the inferior alveolar nerve(IAN) is a relatively infrequent complication in endodontic treatment. However, endodontic overfilling involving the mandibular canal may cause an injury of the inferior alveolar nerve resulting in sensory disturbances such as pain, dysesthesia, paresthesia or anesthesia. Two mechanism(chemical neurotoxicity and mechanical compression) are responsible for the IAN injury. When absorbent materials overfilled, it can be treated as a non-surgical procedure. But early surgical intervention required when mechanical, chemical nerve damage expected. We report surgical removal of overfilled gutta-percha and IAN decompression through sagittal split osteotomy in case of dysesthesia after overfilling of endodontic material into the mandibular canal. Dysesthesia recovered 3 months after surgical treatment.

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Mandibular Symphysis Transverse Widening (임상가를 위한 특집 2 - 하악골의 외과적 확장)

  • Oh, Sung-Hwan
    • The Journal of the Korean dental association
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    • v.51 no.6
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    • pp.313-321
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    • 2013
  • The most common orthodontic methods of treating mandibular transverse deficiencies is extractions, interdental stripping, and other dento-alveolar compensation but it can not addressesd about skeletal problem This study assessed the treatment outcomes after surgically assisted rapid tooth orthodontics using the symphysis osteotomy and dentoalveolar distraction osteogenesis technique. The applications of distraction osteogenesis in mandibular widening, by symphysis osteotomy, has emerged as a definitive, predictable and better stability. The most important factors in mandibular widening is performed with simple surgical technique and devices. As a results, these techniques are very useful and effective in cases of difficult tooth movement in adult orthodontics transverse problems There were few intraoperative or postoperative complications and were not clinically significant.