• 대한두개안면성형외과학회지
• /
• 제9권2호
• /
• pp.105-109
• /
• 2008

악안면 수술에 있어서 악관절 및 교합은 미용적 측면에서 뿐만 아니라 그 기능적 측면에서 더욱 중요하다. 특히 하악이 고정된 경우뿐만 아니라 움직일 때 악관절 및 기능적 교합상태까지 보존 및 재건하고 정확한 수술을 하기 위해서 수술 전후에 적절한 MMF는 필수적이다. 이를 위해 저자들은 치열활봉에 대한 그 동안의 경험을 바탕으로 치열의 흐름에 대한 기본적 이론, 교합을 고려한 치열활봉의 거치방법 및 복잡한 교합평면을 가진 악안면 수술 환자들에 대해서 술전 인상을 이용한 치열활봉 거치법을 제안하는 바이다.

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

• 대한치과교정학회지
• /
• 제44권5호
• /
• pp.268-277
• /
• 2014

A Brazilian girl aged 14 years and 9 months presented with a chief complaint of protrusive teeth. She had a convex facial profile, extreme overjet, deep bite, lack of passive lip seal, acute nasolabial angle, and retrognathic mandible. Intraorally, she showed maxillary diastemas, slight mandibular incisor crowding, a small maxillary arch, 13-mm overjet, and 4-mm overbite. After the diagnosis of severe Angle Class II division 1 malocclusion, a mandibular protraction appliance was placed to correct the Class II relationships and multiloop edgewise archwires were used for finishing. Follow-up examinations revealed an improved facial profile, normal overjet and overbite, and good intercuspation. The patient was satisfied with her occlusion, smile, and facial appearance. The excellent results suggest that orthodontic camouflage by using a mandibular protraction appliance in combination with the multiloop edgewise archwire technique is an effective option for correcting Class II malocclusions in patients who refuse orthognathic surgery.

• 대한수의학회지
• /
• 제53권4호
• /
• pp.207-210
• /
• 2013

Fifteen dry dentate and complete mandible samples from the White Rasquera goat breed were studied for symmetry. Thirty-one landmarks were digitally located on the images of the lateral and medial aspects of each hemimandible. Distances between these landmarks allowed the evaluation of the whole hemimandible and also the neural mandible. In the studied samples, the mandible was rather symmetrical, especially in the medial neural part, and in general, there was no side dominance. Only the diastema differed significantly between the sides, and this was related to the rostral part (incisive arch). The incisive region was the least symmetrical region of the caprine mandible, indicating a modular structure more conservative for the neural part. If unsigned asymmetry is interpreted as a measure of developmental stability, then the studied breed presented a marked ability to develop in good fitness despite the harsh environment. The measurements presented here can also be used as a reference for researchers designing experimental studies, especially on mandibular catch-up growth, and as an aid for zooarchaeologists comparing results from dead animals with those from living goat populations.

• 대한치과교정학회지
• /
• 제12권1호
• /
• pp.31-36
• /
• 1982

20 years old female patient with asymmetric mandibular prognathism had anterior openbite, anterior cross-bite and mandibular shift. This patient was treated with both orthodontic and surgical method. Maxillary second molars were extracted to reduce the wedging effect and maxillary first molars moved to distal by straight pull head gear. After orthognathic surgery, open-bite was corrected with multiple shoe-loop arch wire.

• 대한치과의사협회지
• /
• 제53권7호
• /
• pp.450-456
• /
• 2015

Even the adult cleft lip and palate patient who has not had timely treatment during the growth period, can be treated with orthodontic treatment without the necessity of orthognathic surgery if only the patient is treated under correct diagnosis and fitting appliances. Initially, maxillary arch form is established by constructing trifocal circles. Posterior region can be expanded and derotated laterally with pentahelix and anterior teeth are aligned with Tiggle brackets and "ㄷ"-shaped spring. Thereafter, anterior and posterior regions are consolidated. Mandibular intercanine width should be adjusted to maxillary intercanine width which was unavoidably reduced. Mandibular anterior tooth extraction will be helpful to attain proper mandibular intercanine width and better anterior dental showing.

• 대한치과의사협회지
• /
• 제16권2호통권105호
• /
• pp.147-150
• /
• 1978

The author conducted an experiment on the relativity between the mandibular buccal and lingual cusp inclines by means of measuring full arch plaster cast teeth of the fifty student subjects of the College of Dentistry, Seoul National University. The results were as follows: 1. The statistical relativity between the mandibular buccal and lingual cusp inclines in individual tooth was hardly recognized. 2. In the cusp incline data of the whole posterior teeth, the rough basis for the harmonizing with the other occlusion factors was recognizable. 3. The cusp inclination itself was incomplete in mechanical balance, therefore, it might be said that there were a lot of possibilities that the cusp incline may act as a potential etiological factor to give rise to occlusal diseases.

• Maxillofacial Plastic and Reconstructive Surgery
• /
• 제32권3호
• /
• pp.260-264
• /
• 2010

Treatment of the mandibular fracture consists of reduction and fixation. The apparatus that is used to keep the jaws together during healing will often reduce the fracture as well. When the jaws are brought together and intermaxillary elastic rubber traction is placed, the occlusion of the teeth will help to orient the fractured parts into good position. Intermaxillary fixation, that is, fixation obtained by elastic bands between the upper & lower jaws to which suitable anchoring devices have been attached, will successfully treat most fractures of the mandible. Arch bars are perhaps the ideal method for intermaxillary fixation. Several types of ready-made arch bars are used. But, daily occupational life and oral hygiene is difficult to maintain during the period of longterm immobilized intermaxillary fixation (commonly 6-8 weeks), owing to malnutrition and emotional disorders in a position of the patient with mandibular fractures. Most mandibular fractures heal well enough to allow removal of fixation in about 6 weeks. Though there are many complications of mandibular fracture, such as infection, hemorrhage, trismus, paresthesia and nonunion, it is favorable to attain the short-term removable intermaxillary fixation care by use of an additive incision & drainage establishment on the oral lacerated wounds of adjacent mandibular compound fractures. The purpose of an additive incision & drainge establishment is the prevention of wound infection & nonunion by removing the hematoma & seroma in the fracture sites.

• 대한소아치과학회지
• /
• 제25권2호
• /
• pp.383-399
• /
• 1998

Tooth development is usually described in four stages such as bud stage, cap stage, bell stage and crown stage. Exact time of appearance of tooth primordia is different among reports, and up to now there is no timetable regarding initial tooth development. To understand the congenital malformations and other disorders of the orofacial region, there is a need to establish a standard timetable on early tooth development. Till now, studies on the tooth development were mainly on later fetuses, and only few reports on early stage. Also, there were no reports on the time when bud stage turns to cap stage, and cap stage to bell stage. In this study, external morphology of face and the early development of the tooth, and transition of bud stage to cap stage, cap stage to bell stage were studied using 27 staged human embryos and 9 serially sectioned human fetuses. The results are as follows: 1. Mandibular region was formed by union of both mandibular arch at stage 15, and maxillary region by union of maxillary arch, medial nasal prominence, and intermaxillary segment at stage 19. 2. Ectodermal thickening which represents the primordia of tooth appeared in mandibular region at stage 13, and maxillary region at stage 15. 3. Bud stage began from mandibular primary central incisor at stage 17, and maxillary primary central incisor at stage 18. And the sequence of appearance was in the mandibular primary lateral incisor at stage 19, maxillary primary lateral incisor at stage 20, mandibular primary canine at stage 22, maxillary primary canine and primary first molar at stage 23, madibular primary first molar and maxillary primary second molar at 9th week, and mandibular primary second molar at 10th week of development. 4. Cap stage began from the primary anterior teeth at 9th week, and primary second molar still had the characteristics of cap stage at 12th week of development. 5. Transition to bell stage started from the primary anterior teeth at 12th week, and primary second molar started at 16th week of development. 6. Trnasition to crown stage started from primary anterior teeth at 16th week, and primary second molar at 26th week of development.

• Maxillofacial Plastic and Reconstructive Surgery
• /
• 제14권3호
• /
• pp.207-216
• /
• 1992

The congenital condition referred as hemifacial microsomia is characterized by underdevelopment, malformation or abscence of certain soft and hard tissue derivatives of the first and second branchial arches and open also of structures which are not derived from the branchial arches, such as the zygoma, temporal bone. This is a report about a 14 years old male patient with the chief complaint of severe facial asymmetry, who was diagnosed as hemifacial microsomia having agenesis of the right mandibular condyle and zygomatic arch. Deformities and rib bone graft on the affected mandibular condyle and body, and LeFort I osteotomy in the maxilla. To correct contour-deficient chin, we performed the genioplasty, and the zygomatic arch was reconstructed with rib bone graft.