• Imaging Science in Dentistry
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• 제34권1호
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• pp.31-34
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• 2004

Purpose: To compare the size of the masseter and lateral pterygoid muscle between the affected and the unaffected side of the patients who have the chief complaints of the mandibular asymmetry. Materials and Methods: Twenty two patients (male: 4, female: 18, average age: 21.3 year-old) were radiographed using posterior-anterior (P-A) cephalography and computed tomography (CT). On P-A cephalography, the degree of deviation was determined by the distance from the mentum to the vertical reference line through the crista galli and the anterior nasal spine. On the scanned tracing papers of the maximum cross-sectional area of the masseter and lateral pterygoid muscle using axial CT images, the pixel number was measured. The ratio of the affected : unaffected sides were obtained. For the masseter and lateral pterygoid muscle, the relationship between the muscular volume and degree of skeletal hypoplasia was studied. Results : The half cases showed no skeletal asymmetry. The lateral pterygoid muscle of the affected side was larger significantly than unaffected side (p<0.05). However, there was no significant difference between two sides in the cases of skeletal asymmetry. There was only significant difference in the cases without skeletal asymmetry (p<0.05). Conclusions : To some extent, the slight mandibular hypoplasia could affect the growth of some masticatory muscles.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2006년도 추계 종합학술대회 논문집
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• pp.682-686
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• 2006

모바일 3D 엔진을 탑재한 단말기의 등장과 모바일 콘텐츠 시장의 성장에 따라 3D 모바일 콘텐츠 서비스에 대한 관심이 고조되고 있다. 모바일 3D 아바타는 개인화된 모바일 기기 사용자의 개성을 표출할 수 있는 가장 효과적인 상품이다. 그러나 3D 아바타 표현 방법은 PC기반의 가상환경에서 캐릭터의 얼굴 표정 및 입술 모양 변화에 따른 자연스럽고 사실적인 표현에 대한 연구들이 주로 이루어 졌다. 본 논문에서는 모바일 환경에서 수신된 SMS 메시지를 3D 모바일 아바타에 적용하여 입술 모양 및 음성과 동기화 시키는 방법을 제안한다. 제안된 방법은 수신된 메시지 문장을 음절단위로 분해하여 모바일 3D 아바타의 입술 모양과 해당 음성을 동기화 시킴으로써, 모바일 아바타의 자연스럽고 효과적인 SMS 메시지 읽기 서비스를 구현할 수 있도록 해준다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제36권2호
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• pp.145-148
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• 2010

Maxillofacial injuries are less common in children than in adolescents and adults. This lower incidence is a result of the relatively small size of mandible, the resilient nature of the bones, and a relatively protected environment, which distinguish the treatment principles of pediatric mandibular fractures from those of the adult. The bone of child is malleable, so pediatric fractures tend to be less displaced and rarely comminuted. Moreover, high regeneration potential of the wound allows more conservative treatment modalities for the pediatric mandibular fracture. High risk of damaging unerupted tooth bud renders many clinicians to resort to more conservative treatment modality for the reduction of displaced segments. This case report describes two successful treatment cases using the circummandibular wiring which was applicated to the fracture on parasymphysis of mandible. Circummandibular wiring can protect the tooth buds, and there is no need for intermaxillary fixation so that it prevents the possible complications of intermaxillary fixation such as the temporomandibular joint ankylosis and the facial growth disturbances. The acrylic splint was removed after 3 weeks, which showed clinically good union across the fracture line without complications. They showed complete clinical and radiological bone healing with an optimum occlusion.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제32권3호
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• pp.222-225
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• 2006

The treatment objective of mandibular fracture is a return to normal function. According to Champy, a rigid fixation of mandibular angle fracture is performed by using 4 or 6 holes titanium miniplates on the external oblique ridge of mandible. However, the limitations of metal plate such as hypersensitivity, interference with the cranio-facial growth of growing child, secondary bone resorption around the plate, foreign body reaction, declination of primary callus formation, and bone atrophy due to the lack of normal stress reaction of the bone have been reported. Recently, biodegradable miniplate has been introduced and used as an alternative to the metal plate despite its lower strength than that of the titanium plate and the side effect caused by the resorption in the body. In this study, 61 patients diagnosed as mandibular angle fracture and treated from Jan. 1998 to Dec. 2004 in our department have been reviewed. Metal plate fixation was used in 50 patients and biodegradable plate fixation in 11 patients on the external oblique ridge around the fractured mandibular angle according to the principle of monocortical osteosynthesis by Champy. We compared the incidence of side effects and the degree of bony union at the mandibular inferior border in two different fixation methods. In conclusion, we have found that one miniplate regardless of matter could provide enough strength to grasp bony fragments of the tension site and compress the inferior border of mandible without any complications.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제29권2호
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• pp.187-191
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• 2007

An ameloblastoma is one of the most common odontogenic tumors. Ameloblastoma is cytologically a benign tumor, but is clinically characterized by infiltrative growth and high recurrency. The treatment of ameloblastoma has been controversial. The aim of this paper is to consider effectiveness of curettage and enucleation after SSRO in the small-sized multilocular intraosseous ameloblastomas that have been treated more frequently by radical treatment. They were radiographically characterized by the cortical bone that was expanded or eroded locally and histopathologically by solid multilocular ameloblastomas. It is considered that curettage and enucleation after SSRO and long-term follow-up enable the small-sized multilocular intraosseous ameloblastomas that were characterized by almost destroyed cancellous bone and expanded cortical bone to treat minimizing facial disfigurement and masticatory dysfunction and sociopsychological impact produced by radical treatment. We recommend that the small-sized multilocular intraosseous ameloblastomas without involvement to the surrounding soft tissues be first treated by curettage and enucleation after SSRO.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제41권
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• pp.18.1-18.10
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• 2019

Background: Temporomandibular joint (TMJ) ankylosis during early childhood may lead to disturbances in growth and facial asymmetry and to serious difficulties in eating as well as in breathing during sleep. The purpose of this study is to describe the effectiveness of an interocclusal splint (IOS) for active mouth opening exercises in the treatment of TMJ ankylosis. Methods: A total of nine patients with 13 instances of TMJ ankylosis from 2008 to 2010 were included in this study, of which five patients were male and four patients were female. Five patients demonstrated unilateral ankylosis, while five patients showed bilateral symptoms. Ankylosed mass resection with coronoidectomy, fibrotic scar release, and resection of stylohyoid ligament calcification was performed with gap arthroplasty without an interpositional graft, and all patients were assessed for maximum mouth opening (MMO) during a mean 6.6-year follow-up period. Results: All patients were subjected to postoperative mouth opening exercises from the day of the operation with the help of an IOS, which was based on an impression taken during surgery. All patients were sufficiently comfortable moving their mandible according to the IOS's guiding plane and impingement, and satisfactory results were achieved, in which MMO was improved by 35 mm more than 6 years after surgery. Conclusions: Complete and adequate resection of the ankylosed mass and postoperative active mouth opening exercises are essential in the treatment of TMJ ankylosis. Moreover, a more comfortable mouth opening guide and interdigitation can be achieved using an IOS, and newly organized fibrosis in the gap space between the newly made resected condylar head and temporal fossa can be suggested.

• 대한치과교정학회지
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• 제46권6호
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• pp.395-408
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• 2016

We report a case involving a young female patient with severe mandibular retrognathism accompanied by mandibular condylar deformity that was effectively treated with Le Fort I osteotomy and two genioplasty procedures. At 9 years and 9 months of age, she was diagnosed with Angle Class III malocclusion, a skeletal Class II jaw relationship, an anterior crossbite, congenital absence of some teeth, and a left-sided cleft lip and palate. Although the anterior crossbite and narrow maxillary arch were corrected by interceptive orthodontic treatment, severe mandibular hypogrowth resulted in unexpectedly severe mandibular retrognathism after growth completion. Moreover, bilateral condylar deformities were observed, and we suspected progressive condylar resorption (PCR). There was a high risk of further condylar resorption with mandibular advancement surgery; therefore, Le Fort I osteotomy with two genioplasty procedures was performed to achieve counterclockwise rotation of the mandible and avoid ingravescence of the condylar deformities. The total duration of active treatment was 42 months. The maxilla was impacted by 7.0 mm and 5.0 mm in the incisor and molar regions, respectively, while the pogonion was advanced by 18.0 mm. This significantly resolved both skeletal disharmony and malocclusion. Furthermore, the hyoid bone was advanced, the pharyngeal airway space was increased, and the morphology of the mandibular condyle was maintained. At the 30-month follow-up examination, the patient exhibited a satisfactory facial profile. The findings from our case suggest that severe mandibular retrognathism with condylar deformities can be effectively treated without surgical mandibular advancement, thus decreasing the risk of PCR.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제28권1호
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• pp.24-30
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• 2002

The facial patterns were expressed by the interrelation of variable factors such as heredity, function and environment. Such variable factors have an effect on the growth and development of maxillofacial bones. The malocclusions with skeletal discrepancies are caused by abnormal forms, sizes and positions of cranial base, maxilla and mandible. For the proper diagnosis and treatment planning, the analysis of such structures is necessary. Lateral cephalograms of 54 adults with class III malocclusion patients (test group) and 61 adults with normal occlusion (control group) were analyzed. Anteroposterior relations and sizes of cranial base, maxilla, mandible were estimated to compare with those of normal ones. In test group, the anterior cranial base length was within normal range, but posterior cranial base, maxilla and mandibular body were longer than those in control group, significantly. Based on the cranial base, the location of maxilla in test group was normal, but the location of mandible was more anterior than that in control. Based on the maxilla, the location of mandible was more anterior in test group than that in control. Both mandibular body and ramus anteroposterior lengths in test group were larger than those in control. Both mandibular plane angle and upper gonial angle were within normal range, but lower gonial angle was significantly high in test group.

• 대한소아치과학회지
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• 제31권1호
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• pp.120-125
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• 2004

Cornelia de Lange Syndrome은 이형성적 특징들에 의해 특징 지워지는 증후군으로서 정확히 알려지지 않은 원인을 가진 이상증이다. 이 증후군은 이형성적 임상증상에 의거하여 진단되기 때문에 염색체 검사, 유전자 검사 등의 진단 목적의 다른 검사들은 유효하지 않다고 할 수 있다. 임상증상으로는 전반적 발육 장애 정신지체, 외소증 다모증(hypertrichosis), 갈매기 모양의 눈썹(confluent eye brows), 낮은 헤어라인, 낮고 평평한 코, 위로 들린 코끝, 사지 기형, 발가락의 합지증(webbing), 심장기형, 위식도 역류 질환, 청력 이상, 그리고 안 질환 등이 나타나며 구강관련 증상으로는 왜소악 치아 맹출 지연, 구순 구개열, 높은 구개궁, 얇은 상순, 그리고 처진 구각 등이 나타난다. 본 증례에서는 전북대학교병원 소아치과에 치아 우식증을 주소로 내원한 Cornelia do Lange Syndrome을 가진 3세 및 4세 여환의 치료 예를 보고하는 바이다.

• 대한소아치과학회지
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• 제34권4호
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• pp.694-699
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• 2007

정상적인 맹출 시기는 종족, 인종, 성별과 개인적인 요소에 의해 결정되며, 만약 정상적인 맹출 시기에서 두드러지게 벗어날 경우 맹출 지연이라고 한다. 영구치의 맹출 지연 원인은 다양하며, 발생 시 치열 및 악궁에 부정적인 영향을 줄 수 있어 조기진단 및 치료가 중요하다. 본 증례들에서는 치아종 및 치아발육부전 그리고 낭종으로 인한 맹출지연을 보이는 각각의 환자에 대해 맹출 방해 인자의 제거와 맹출 공간의 형성 및 유지만으로 자발적 맹출을 이룰 수 있었기에 보고하는 바이다.