• Maxillofacial Plastic and Reconstructive Surgery
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• 제18권4호
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• pp.563-569
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• 1996

Skeletal and dental changes were examined in 38 patients of mandibular prognathism who been treated by a bilateral sagittal split osteotomy(SSRO) and internal fixation using titanium mini-screws. All patients were followed up for over 8 months after the surgeries, and postoperative cephalometric measurements were compared at 2 months and at 8 months. Linear measurements of the "Pog-most posterior screws" and angular measurementsts of "SN-Pog'were compared to figure out the change of bony fragments. The significancy of data were tested by unpaired T-test. The results were as follows : 1. The fixation screws were changed in cephalometric position as little as $0.32{\pm}2.51mm$ in SSRO and $0.15{\pm}1.00mm$ in SSRO & Le Fort I Osteotomy.(P<0.05) 2. Mandibular set-back over 5mm resulted in less stability of the fixation screws and higher relapse tendency. 3. The internal fixation using two screws along the inferior border and one on the superior ridge is considered to be very resistant to postoperative relapse of the repositioned bony segments.

• 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 Oral Medicine and Pain
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• 제38권3호
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• pp.255-260
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• 2013

양측 하악지 시상 골절단술은 악안면 기형 및 부정교합을 치료하기 위해 흔히 사용되는 필수불가결한 술식이라고 할 수 있다. 하악지 시상 골절단술 후 발생할 수 있는 합병증으로는 하치조 신경 손상, 출혈, 측두하악장애, 부적절한 골면의 유합 및 골절, 재발 등이 있다. 악교정 수술 후 안면신경 마비의 발생 유병율은 최근 0.1 퍼센트로 보고되고 있다. 증상 발생의 원인으로는 안면신경의 압박, 신경의 불완전 또는 완전 손상, 신경의 견인, 마취제에 의한 신경의 허혈 등이 있다. 술 후 발생된 안면 신경의 마비는 환자의 삶의 질을 저해하고 사회활동을 기피하게 함으로써 가장 심각한 합병증 중 하나라고 볼 수 있다. 본 증례에서는 양측 하악지 시상 골전달술을 시행 후 발생한 안면신경 마비에 대하여 보고하고 있다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제41권3호
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• pp.156-164
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• 2015

Bilateral sagittal split ramus osteotomy is considered a standard technique in mandibular orthognathic surgeries to reduce unexpected bilateral stress in the temporomandibular joints. Unilateral sagittal split ramus osteotomy (USSO) was recently introduced to correct facial asymmetry caused by asymmetric mandibular prognathism and has shown favorable outcomes. If unilateral surgery could guarantee long-term postoperative stability as well as favorable results, operation time and the incidence of postoperative complications could be reduced compared to those in bilateral surgery. This report highlights three consecutive cases with long-term follow-up in which USSO was used to correct asymmetric mandibular prognathism. Long-term postoperative changes in the condylar contour and ramus and condylar head length were analyzed using routine radiography and computed tomography. In addition, prior USSO studies were reviewed to outline clear criteria for applying this technique. In conclusion, patients showing functional-type asymmetry with predicted unilateral mandibular movement of less than 7 mm can be considered suitable candidates for USSO-based correction of asymmetric mandibular prognathism with or without maxillary arch surgeries.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제36권2호
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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.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제33권2호
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• pp.190-197
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• 2011

The management of mandibular prognathism was revolutionized by the advent of the of sagittal split ramus osteotomy (SSRO) technique as described by Obwegesser and Trauner in 1957. Facial nerve palsy following SSRO is a rare but serious problem. In the event of post-operative facial palsy, careful clinical and neurophysiological investigations such as a nerve condunction test for facial function is mandatory. The authors examined patients with facial palsy following SSRO. Patients recovered after 3~4 months and we had performed clinical examinations with electromyography and nerve conduction tests during follow-up period.

• 대한두개안면성형외과학회지
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• 제18권1호
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• pp.65-70
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• 2017

A 25-years-old woman with mandibular prognathism underwent a mandibular setback by way of mandibular sagittal split ramus osteotomy (MSSRO). After 2 days of operation, she developed difficulty of closing her right eye. The blink reflex test and motor nerve conduction study of the right orbicularis oris muscle were revealed right facial neuropathy of unknown origin and House-Brackmann facial nerve grading system (HBFNGS) grade V. For treatment, we initially prescribed oral prednisolone and nimodipine including physical therapy. The samples consisted of 11 facial nerve palsy patients caused by MSSRO and were analysed about onset of facial nerve palsy, postoperative HBFNGS, final HBFNGS, treatment method and recovery time. At 10 weeks of treatment of nimodipine, she had completely regained normal function (HBFNGS grade I) of the right facial nerve. The clinical results lead to assume a fast recovery of facial nerve function by the nimodipine medication, whereas average time of recovery is 16.32 weeks in references. Despite of the limited one patient treated, the result was very promising with respect to a faster recovery of the facial nerve function. Considering the use of nimodipine treatment for peripheral facial nerve palsy following a surgical approach with an anatomically preserved nerve can be recommended.

• 대한치과의사협회지
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• 제55권8호
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• pp.537-540
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• 2017

BSSRO (bilateral sagittal split ramus osteotomy) is frequently performed to correct dentofacial deformity and malocclusion. Among its complications the incidence of post-operative facial nerve palsy is very rare, but it is one of the most serious complications. The case of a 21-year-old male patient who underwent facial nerve palsy after BSSRO is described. After surgical intervention and conservative therapy, the patient recovered his facial nerve function successfully.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제11권2호
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• pp.87-95
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• 1989

하악골 과두골절의 치로에 대해서는 여러가지 술식이 문헌상 보고되었으나 어떤 특정한 술식이 모든 증례에 적용될 수는 없으므로 각 증례에 따라 방사선 사진검사와 세밀한 임상검사 및 술자의 판단등에 따라 보존적인 치료법이나 외과적 수술법이 적절하게 선택되어야 한다. 대부분의 과두골절은 보존적인 치료만으로 만족스러운 결과를 얻을 수 있으나 보존적 처치후 장기간에 걸친 술후 검사시 하악의 기능장애, 부정교합, 하악골의 이환측으로의 전위, 위관절증 및 악관절 강직등의 병발증이 나타날 수 있으므로 골편이 심하게 전위된 경우나 무치악 환자, 구치부 고경유지가 어려운 환자 및 보존적 처치후 기능장애를 초래한 골편의 부정유합이나 비유합 환자에서는 관혈적 정복술로 보다 양호한 결과를 얻을 수 있다. 저자는 하악골 과두골절시 골편전위가 비교적 심한 6증례에서 악하부 피부절개를 통해 통상의 금속선 고정법, Kirschner 금속선을 이용한 고정법을 각 1예씩 사용하였고 4예는 골절선이 비교적 높아 통상의 수술방법으로 접근이 용이하지 않아 시상골절단과 사선골절단술을 이용하여 골편정복과 고정술을 시행하여 다소의 지견을 얻어 이에 보고하는 바이다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제41권4호
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• pp.208-212
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• 2015

Keratocystic odontogenic tumor (KCOT) is a common benign tumor of osseous lesions in dental and maxillofacial practice. We describe three cases of large KCOT located in the posterior part of the mandible extending to the angle and ramus region, which were enucleated via sagittal split osteotomy (SSO) of the mandible. There are cases in which a conventional enucleation procedure does not ensure complete excision of the entire lesion without damage to vital structures like the inferior alveolar nerve. In such cases, a SSO approach could be a better choice than conventional methods. The purpose of this article is to describe our experience using unilateral mandibular SSO for removal of a KCOT from the mandible.