• 대한치과교정학회지
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• 제15권1호
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• pp.149-153
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• 1985

The purpose of this study was to pursue the morphology and position of mandibular symphysis and the positioning of lower incisors in 36 male and female adults with severe skeletal Class III malocclusion indicated for surgical orthodontic treatment. The following results were obtained. 1. Skeletal Class III malocclusion samples had thinner labio-lingual depth and more lingual inclination of mandibular symphysis than that of normal occlusion in both sexes. 2. Male and female with the skeletal Class III malocclusion showed marked lingual tipping of lower incisors. 3. In skeletal Class III malocclusion samples, lingual basal bone was thinner than that of normal occlusion in both sexes.

• 대한소아치과학회지
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• 제46권2호
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• pp.173-182
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• 2019

본 연구의 목적은 혼합치열기 초기에 III급 부정교합을 보이는 어린이에서 수직성장을 유도하는 III급 고무줄을 걸 수있도록 고안된 구강내 가철식장치를 사용하여 반대교합을 치료시, 그 구체적인 치료기간을 알아보고, 이에 영향을 주는 변수를 확인하는 것이다. 본 소아치과에 III급 부정교합을 주소로 내원하여 구강내 가철식 장치로 치료를 완료한 56명의 환자를 대상으로 치료개시 연령, 치료기간 및 치료유형, 수평피개량, 수직피개량 등의 자료를 수집하였다. 환자군의 교정개시 연령은 8.75세이었고, 교합이 넘어갈때까지 3.31개월, 이후 정상 피개까지 1.90개월이 소요되어, 대부분이 개시 6개월 이내에 개선되었다. 전체 치료기간은 21.79개월이었고 환자의 협조도(p = 0.000)와 고정식 교정장치의 여부(p = 0.032)가 치료기간에 유의하게 영향을 주었다. 결론적으로 본 연구의 가철식장치는 수년간 장시간 장착하며 악정형력을 주는 구강외 장치에 비해서 그 치료기간이 6개월 이내로 짧으며, 혼합치열기 III급 부정교합 어린이에서 효과적으로 이용할 수 있다.

• 대한치과교정학회지
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• 제24권2호
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• pp.319-329
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• 1994

This study was carried out to research the adaptation patterns of head posture after activator therapy in functional class III malocclusion patients. For this purpose, 29 functional class III malocclusion patients, from the ages of 8 to 13 years old, were used. 1, Increse in capacity of oral cavity capacity were found in all the samples, but craniocervical angulation were varied into incresed group and decreased group after activator therapy. 2. Head posture exhibited the compensatory adaptation in the relative growth increments of the vertical dimension, ALFH and PLFH. 1) A group with more PLFH and less sagittal angle showed relatively small growth increment in PLFH during the treatment period, thus craniocervical angulation was increased. 2) A group with less PLFH and more sagittal angle showed relatively great growth incrmenet in PLFH during the treatment period, thus craniocervical angulation was decreased.

• 대한치과교정학회지
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• 제14권1호
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• pp.33-37
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• 1984

The prevalence of normal occlusion and malocclusion was assessed by Angle's Classification method for 8989 school students at 7-22 years in Seoul. The occurrence of malocclusion and the need-for orthodontic treatment was 61 per cent among them. Results indicated no significant differences between the sexes for the occlusal relationships of the mandible to the maxille. The prevalence of Class I, Class II, and Class III malocclusion in all malocclusion was shown to be Class I, 45.7 per cent; Class II, 7.6 per cent; and Class III, 7.9 per cent. Class II Division 1 was observed to occur four times frequently compared to Class II Division 2 in Class II malocclusions. Class III malocclusion was shown to occur more frequently compared that of Caucasians.

• 대한구순구개열학회지
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• 제16권1호
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• pp.19-23
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• 2013

Maxilla protraction, orthopedic correction of deficient maxilla is necessary for treatment of most Class III growing patients. Protraction method has evolved from tooth-born appliance to miniplates on the maxilla, and from face mask to miniplates on the chin. By placing miniplates on the maxilla and the mandible and running elastics between them, we can minimize dentoalveolar relapse and maximize orthopedic change.

• 대한치과교정학회지
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• 제52권5호
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• pp.362-371
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• 2022

Orthognathic surgery is the primary treatment option for severe skeletal discrepancy. However, orthodontic camouflage should be considered as an alternative treatment option, considering the risks of surgery. A 19.5-yearold man presented with a severe prognathic mandible with a Class III molar relationship and an anterior crossbite. Orthognathic surgery could be considered because of his severe skeletal discrepancy and mandibular prognathism. However, the anesthetist for orthognathic surgery did not recommend surgery under general anesthesia because of risk factors associated with the patient's aplastic anemia, including bleeding and infections. Thus, a camouflage treatment to promote backward rotation of the mandible via orthodontic extrusion of the posterior teeth was planned. An anterior bite plate, intermaxillary elastics, and fixed orthodontic appliances were used to extrude the posterior teeth and to align the dentition. After 17 months of nonsurgical orthodontic treatment, normal occlusion was achieved, and the facial profile was dramatically improved. This case report describes the dentoskeletal and soft-tissue effects of mandibular rotation and its long-term stability.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제22권4호
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• pp.397-410
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• 2000

Skeletal class III had been classified by the position of the maxilla, the mandible, the maxillary alveolus, the mandibular alveolus and vertical development. This morphologic approach is simple and useful for clinical use, but it is insufficient to permit understanding of the pathophysiology of dysmorphoses. The author hypothesizes that there are different patterns of mutual relation of the skeletal components which have contributed pathologic equilibrium of skeletal class III. The purpose of this study are threefold: 1) to classify skeletal class III in subgroups, which can show the architectural characteristics of the deformity, 2) to analyse the craniofacial architecture of each subgroup on etio-pathogenic basis, and 3) to characterize and visualize the pattern as a prototype. Materials used in this study were lateral cephalograms of 106 skeletal class III adults, which were analysed with modified Delaire's architectural and structural analysis. Linear and angular measurements of the individual subject were obtained and cluster analysis was used for the subgrouping. Data were evaluated for verification of the statistical significances. The following results were obtained. 1. By the modified Delaire's architectural and structural analysis and cluster analysis, skeletal class III adults were classified into 7 clusters and presented as prototypes, which could show the pathophysiology of the skeletal architecture 2. There was significant relationship in measurement variables of each cluster, which could reflect characteristics of the skeletal pattern of growth. 3. The flexure of cranial base had a close relationship to the anterior rotational growth of the maxilla and contributes to understand the etio-pathology of skeletal class III. 4. The proportion of craniospinal area in cranial depth, craniocervical angle and vertical position of point Om had a close relationship to rotational growth of the mandible and direction of condylar growth. They contribute to understand the etio-pathology of skeletal class III. In summary, the cranium and the craniocervical area must be considered in diagnosis and treatment planning of dentofacial deformity. And the occlusal plane can be considered as a representative which shows the mutual relationships of the skeletal components.

• 대한치과교정학회지
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• 제53권1호
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• pp.35-44
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• 2023

Objective: Surgically assisted maxillary protraction is an alternative protocol in severe Class III cases or after the adolescent growth spurt involving increased maxillary advancement. Correction of the maxillary deficiency has been suggested to improve pharyngeal airway dimensions. Therefore, this retrospective study aimed to analyze the airway changes cephalometrically following surgically assisted maxillary protraction with skeletal anchorage and Class III elastics. Methods: The study population consisted of 15 Class III patients treated with surgically assisted maxillary protraction combined with skeletal anchorage and Class III elastics (mean age: 12.9 ± 1.2 years). Growth changes were initially assessed for a mean of 5.5 ± 1.6 months prior to treatment. Airway and skeletal changes in the control (T0), pre-protraction (T1), post-protraction (T2), and follow-up (T3) periods were monitored and compared using lateral cephalometric radiographs. Statistical significance was set at p < 0.05. Results: The skeletal or airway parameters showed no statistically significant changes during the control period. Sella to nasion angle, N perpendicular to A, Point A to Point B angle, and Frankfort plane to mandibular plane angle increased significantly during the maxillary protraction period (p < 0.05), but no significant changes were observed in airway parameters (p > 0.05). No statistically significant changes were observed in the airway parameters in the follow-up period either. However, Sella to Gonion distance increased significantly (p < 0.05) during the follow-up period. Conclusions: No significant changes in pharyngeal airway parameters were found during the control, maxillary protraction, and follow-up periods. Moreover, the significant increases in the skeletal parameters during maxillary protraction were maintained in the long-term.

• 대한치과교정학회지
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• 제34권3호
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• pp.205-218
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• 2004

III급 부정교합을 조기에 치료했을 때, 치료 후 retention 기간 중에 교합이 안정적으로 유지되는 경우와, 재발되어 성장 완료시기에 악교정수술을 해야 하는 경우를 경험하게 된다. 어린 년생부터 장기간에 걸쳐 교정치료를 했음에도 재발되어 악교정수술을 하는 경우에, 환자와 보호자는 소모된 시간과 경비에 대해 많은 실망을 하는 경우를 볼 수 있다. 교정치료 후 보정기간 중에 있는 30증례를 조사했다. 치료 완료된 교합상태를 교합안정 정도에 따라 good, fair, relapse군으로 나누어 치료 전 골격형태를 관찰한 결과, AB-MP 항목이 유의성 있는 차이를 보였다. 조기에 III급 부정교합을 치료하는 경우에, 치료 후 안정에 관한 예후를 평가하는데 AB-MP를 활용할 수 있다. AB-MP이 65이상인 경우에 조기치료가 권장되고, 60이하인 경우에는 성장이 완료될 때까지 연기할 수 있다.

• 대한치과교정학회지
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• 제50권5호
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• pp.304-313
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• 2020

Objective: The aim of this study was to evaluate the stability of bimaxillary surgery involving bilateral intraoral vertical ramus osteotomy performed with or without presurgical miniscrew-assisted rapid palatal expansion (MARPE) in adult patients with skeletal Class III malocclusion. Methods: A total of 40 adult patients with skeletal Class III malocclusion were retrospectively divided into two groups (n = 20 each) according to the use of MARPE for the correction of transverse maxillomandibular discrepancy during presurgical orthodontic treatment. Serial lateral cephalograms and dental casts were analyzed until 6 months after surgery. Results: Before presurgical orthodontic treatment, there was no significant differences in terms of sex and age between groups. However, the difference of approximately 3.1 mm in the maxillomandibular intermolar width was statistically significant (p < 0.001). Two days after surgery, the mandible had moved backward and upward without any significant intergroup difference. Six months after surgery, the maxillary intercanine (2.7 ± 2.1 mm), interpremolar (3.6 ± 2.4 mm), and intermolar (2.0 ± 1.3 mm) arch widths were significantly increased (p < 0.001) relative to the values before presurgical orthodontic treatment in the MARPE group; these widths were maintained or decreased in the control group. However, there was no significant difference in surgical changes and the postsurgical stability between the two groups. No significant correlations existed between the amount of maxillary expansion and postsurgical mandibular movement. Conclusions: MARPE is useful for stable and nonsurgical expansion of the maxilla in adult patients with skeletal Class III malocclusion who are scheduled for bimaxillary surgery.