• 대한치과교정학회지
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• 제45권3호
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• pp.121-129
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• 2015

Objective: This study aimed to assess three-dimensional changes in the temporomandibular joint positions and mandibular dimensions after correction of dental factors restricting mandibular growth in patients with Class II division 1 or division 2 malocclusion in the pubertal growth period. Methods: This prospective clinical study included 14 patients each with Class II division 1 (group I) and Class II division 2 (group II) malocclusions. The quad-helix was used for maxillary expansion, while utility arches were used for intrusion (group I) or protrusion and intrusion (group II) of the maxillary incisors. After approximately 2 months of treatment, an adequate maxillary arch width and acceptable maxillary incisor inclination were obtained. The patients were followed for an average of 6 months. Intraoral and extraoral photographs, plaster models, and cone-beam computed tomography (CBCT) images were obtained before and after treatment. Lateral cephalometric and temporomandibular joint measurements were made from the CBCT images. Results: The mandibular dimensions increased in both groups, although mandibular positional changes were also found in group II. There were no differences in the condylar position within the mandibular fossa or the condylar dimensions. The mandibular fossa depth and condylar positions were symmetrical at treatment initiation and completion. Conclusions: Class II malocclusion can be partially corrected by achieving an ideal maxillary arch form, particularly in patients with Class II division 2 malocclusion. Restrictions of the mandible in the transverse or sagittal plane do not affect the temporomandibular joint positions in these patients because of the high adaptability of this joint.

• 대한치과교정학회지
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• 제46권3호
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• pp.137-145
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• 2016

Objective: The purpose of this study was to investigate the characteristics of orthodontic patients at Yonsei Dental Hospital from 2008 to 2012. Methods: We evaluated Angle's classification from molar relationships, classification of skeletal malocclusion from the A point-nasion-B point angle, facial asymmetry, and temporomandibular joint disorders (TMDs) from the records of 7,476 patients who received an orthodontic diagnosis. The orthognathic surgery rate, extraction rate, and extraction sites were determined from the records of 4,861 treated patients. Results: The patient number increased until 2010 and gradually decreased thereafter. Most patients were aged 19-39 years, with a gradual increase in patients aged ${\geq}40years$. Angle's Class I, Class II divisions 1 and 2, and Class III malocclusions were observed in 27.7%, 25.6%, 10.6%, and 36.1% patients, respectively, with a gradual decrease in the frequency of Class I malocclusion. The proportion of patients with skeletal Class I, Class II, and Class III malocclusions was 34.3%, 34.3%, and 31.4%, respectively, while the prevalence of facial asymmetry and TMDs was 11.0% and 24.9%, respectively. The orthognathic surgery rate was 18.5%, with 70% surgical patients exhibiting skeletal Class III malocclusion. The overall extraction rate among nonsurgical patients was 35.4%, and the maxillary and mandibular first premolars were the most commonly extracted teeth. Conclusions: The most noticeable changes over time included a decrease in the patient number after 2010, an increase in the average patient age, and a decrease in the frequency of Angle's Class I malocclusion. Our results suggest that periodic characterization is necessary to meet the changing demands of orthodontic patients.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제43권2호
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• pp.88-93
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• 2017

Objectives: Any change in maxilla and mandible position can alter the upper airway, and any decrease in the upper airway can cause sleep disorders. Thus, it is necessary to assess airway changes after repositioning of the maxilla and mandible during orthognathic surgery. The purpose of this study was to evaluate linear and volumetric changes in the upper airway after bimaxillary surgery to correct class III malocclusion via cone-beam computed tomography (CBCT) and to identify correlations between linear and volumetric changes. Materials and Methods: This was a prospective cohort study. CBCTs from 10 class III patients were evaluated before surgery and three months after. The Wilcoxon one-sample test was used to evaluate the differences in measurements before and after surgery. Spearman's rank correlation coefficient was used to test the correlation between linear and volumetric changes. Results: The results show that the nasopharyngeal space increased significantly, and that this increase correlated with degree of maxillary advancement. No significant changes were found in volumes before and after surgery. A correlation was found between linear and volumetric oropharyngeal changes. Conclusion: Bimaxillary surgical correction of class III malocclusion did not cause statistically significant changes in the posterior airway space.

• 대한소아치과학회지
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• 제27권4호
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• pp.479-484
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• 2000

III급 부정교합, 특히 전치부 반대 교합은 부모나 주위 사람에 의해 쉽게 인지되기 때문에 비교적 어린 시기에 내원하는 빈도가 높아지고 있다. 이에 따라 치과의사는 치료시기에 대한 결정, 적절한 case의 선택, 장기간에 걸친 치료, 치료후의 재발 등에 대한 심리적 부담감을 안게 되며 보호자 또한 시간적, 경제적인 어려움을 겪게 된다. 그러나, 반대 교합 그 자체는 조기 개선시 상악골의 성장 저해를 막을 수 있으며, 하악 과성장을 억제함으로써 기능성 인 경우에 골격성으로의 발전을 억제 할 수 있다. 그리고 상하악골의 골격 부조화가 매우 크거나 좋은 예후를 기대하기 힘든 골격 구조에 대해서도 정확한 평가가 병행 되어야 한다. 골격성 III급 부정교합으로 내원한 환아를 성장기 동안 치료함으로써 다음과 같은 결론을 얻었다. 1. 상악골의 정상적 인 성장 저해 요소를 제거하고, 하악골의 과성장을 조절해줌으로써 전치부 반대교합을 해소하였다. 2. 상악골과 상악 전치는 전하방으로, 하악골과 하악 전치는 후하방으로 이동하였다. 3. 경조직, 연조직의 변화로 인해 안모의 개선을 나타내었다.

• 대한치과기공학회지
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• 제35권4호
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• pp.395-403
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• 2013

Purpose: This article examined the affecting factors of a malocclusion status of a patient for orthodontic treatment, orthodontics medical expenses and oral health behavior on orthodontic satisfaction. Methods: This paper conducted a survey from the 15th of July to 30th of September 2012 for the patients who were under orthodontic treatment at three dental clinics where are in Deagu, and distributed a total of 210 questionnaires and analyzed 194 questionnaires, excepting for some questionnaires that were answered unfaithfully. Results: This study classified the related factors into a feeling of satisfaction with treatment and mental satisfaction for finding orthodontic satisfaction. There were the effect of the right tooth-brushing method, a periodic scaling and orthodontics medical expenses on a feeling of satisfaction with treatment, and power of explanation was 16.7%. Conclusion: There were the effect of a malocclusion status, matters that requires attention during orthodontic treatment, a periodic scaling during orthodontic treatment and orthodontics medical expenses on mental satisfaction, and power of explanation was 16.9%. Based on the result above, this paper concluded that preventive treatment and early treatment should be emphasized through developing a program for regular oral examination suited to each medical type, including the method for improving the medical treatment condition and care service for increasing orthodontic satisfaction, which the dental medical-service providers could consider the patients and secure trust.

• 구강회복응용과학지
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• 제24권1호
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• pp.29-40
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• 2008

본 연구의 목적은 10-12세 성장기 아동에서 측두하악장애의 증상과 징후 및 부정교합의 유병율과 이의 상관관계에 대해 알아보고자 하였다. 연구를 위해 강릉시에 위치한 6개 초등학교의 10-12세 아동 465명(남자 233명, 여자 232명)을 대상으로 간이병력조사와 간이임상검사를 시행하였다. 조사 결과, 측두하악장애 증상 중 두통의 유병율(34.6%)이 가장 높았으며, 여자(40.4%)가 남자(28.8%)보다 유의성 있게 높았다. 그 밖의 측두하악장애 증상은 연령 증가에 따라 혹은 성별에 따라 유의한 차이가 없었다. 측두하악장애 징후 중 단순관절음의 유병율(32.9%)이 가장 높았으며, 연령 증가에 따라 유의한 증가를 보였다. 악관절 촉진시 측방 압통의 유병율은 18.1%이었으며, 연령 증가에 따라 유의한 증가를 보였다. 근육 촉진시 압통에서 교근의 유병율(15.1%)은 전측두근과 후측두근 보다 높았으며, 연령 증가에 따라 유의성 있는 증가를 나타냈다. 개구제한의 유병율은 30.3%를 차지하였으며, 연령 증가에 따라 유의성 있는 증가를 보였다. 모든 측두하악장애 징후의 유병율은 성별에 따른 유의한 차이를 보이지 않았다. Angle's I급 부정교합(73.3%)이 가장 흔하였으며, 다음으로 III급 (12.9%), II급 1류 (11%), II급 2류 (2.8%) 순을 보였다. 각각의 교합상태의 유병율은 성별에 따라 유의성 있는 차이는 없었다. 측두하악장애 증상 및 징후에 관련된 교합상태는 II급 1류와 III급 부정교합이었다 (p<0.05). 본 연구결과는 성장기 아동에서 측두하악장애 증상 및 징후가 높은 유병율을 나타내, 성장기 아동의 측두하악관절 평가가 중요함을 시사한다.

• 대한치과교정학회지
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• 제9권1호
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• pp.39-65
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• 1979

The purpose of this study was to investigate the pattern of irregularities of teeth in various malocclusion groups. The subjects consist of 803 out-patients (355 males, and 448 females) in department of Orthodontics of S.N.U. Hospital, Yonsei University, and Kyunghi University Hospital. The results were as follows. 1. The proportions of subjects on the basis of Angle's Classification were 39.2% (42.2% male, and 57.8% fomale) in class I malocclusion, 29.0% (44.6% male, and 55.4% female) in class II. div. 1., 3.5%(46.4% male, and 53.6% female) in class II. div. 2., 28.3%(46.3% male, and 53.7% female) in class III. 2. Considering all the subjects, the percentage of teeth crowding was 67.8% (45.0% male, and 55.0% female). In class I malocclusion, the percentage of Crowding was 70.8%(43.5% male, and 56.5% female) with higher frequency in upper anterior teeth than in lower anterior. 3. The percentage of Maxillary anterior diastema was 25.6% (45.6% male, and 54.4% female) on the whole. In class II. div. 1. malocclusion, the percentage was 28.8% (46.3% male, and 53.7% female) and in class III, the percentage was 19.8% (46.7% male, and 53.3% female). Thus, frequency of maxillary anterior distema, was comparatively higher in class II. div. 1. than in class III. 4. The percentage of high canine was 25.1% (53.2% male, and 46.8% female) on the whole, and was 86.0% male and 76.6% female in right side, 73.0% male and 72.3% female in left side. In calss II. div. 2., the percentage was 53.6% (46.7% male, and 53.3% female ). In class II. div. 1., the percentage was 16.7% (46.2% male, and 53.8%) with higher frequency in class II. div.2. 5. The percentage of deep overbite was 23.0% (43. 2% male, and 56.8% female) on the whole. Ia class 11. div. 2., and in clas sll. div. 1., its were 89.3%(48.0% male and 52.0% female), 54.5% (40.9% male, and 59.1% female) respectively. This result can be considered as one of the characterics of Angle's class 11 malocclusion group. 6. The percentage of spacing was 23.0% (36.8% male, and 63.2% female) on the whole, In class II. div. 1., and in class II. div. 2., its were 26.1% (44.3% male, and 55. 7% female), 7.1% (50.0% male, and 50.0% female) respectively. 7. The percentage of open bite was 14.3% (42.6% male, and 57.4% female) on the whole with higher rate on the anterior part. It rated 17.6%(50. 0% male, and 50.0% female) in class III, but none in class II. div. 2. 8. The percentage of crossbite was 22.5% (55.8% male, and 44.2% female) on the whole, with higher frequency on the anterior part than on the posterior part. In Angle's class III, it rated as much as 55.1% (57.6% male, and 42.4% female). 9. The percentage of edge-to-edge bite was 20.4% (47.6% male, and 52.4% female) with higher frequency on anterior part than on posterior part. 10. The percentage of irregularities of teeth in various malocclusion groups, was 21.5% (24.8% maxillary, and 18.1% mandible) in crowding, 20.8% (23.5% maxillary, and 18.0% mandible) in rotation, 10.7% (10.6% maxillary, and 10.8% mandible) in cross bite, 9.5% (11.8% maxillary, and 7.3% mandible) in spacing, 8.5% (8.5% maxillary, and 8.5% mandible) in edge-to-edge bite, 8.1% (8.3% maxillary, 7.8% mandible) in open bite. Crowding teeth, spacing teeth, and rotating teeh were more prevalent in anterior part than in posterior part. Cross bite teeth and edge-to-edge bite teeth were more prevalent in class III malocclusion than in another.

• 대한소아치과학회지
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• 제35권2호
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• pp.235-242
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• 2008

본 연구는 I급 부정교합과 III급 부정교합 어린이의 수완부 골성숙 단계와 하악 제3대구치 발육을 비교.평가하고자 하였다. 이를 위해 전남대학교병원 소아치과에 내원한 환자들로 8세부터 15세 사이의 Angle I급 부정교합을 지닌 남자 149명, 여자 155명 그리고 Angle III급 부정교합을 지닌 남자 153명, 여자 155명, 총 612명을 대상으로 하였으며 골성숙 단계 평가를 위해 수완부 사진을 이용한 Fishman의 방법을 사용하였고 하악 제3대구치의 발육 단계를 평가하기 위해 Orthopantomogram을 이용한 Gat 등의 New Six-Developmental-Stage 방법으로 판독하여 다음과 같은 결과를 얻었다. 1. 골성숙 단계는 I급 부정교합과 III급 부정교합군 모두 전반적으로 여자가 남자보다 빠르나(p<0.05) 하악 제3대구치의 석회화 단계는 성별 차이가 없었다. 2. 남녀별 골성숙 단계와 하악 제3대구치의 석회화 단계는 I급과 III급 부정교합군 간에서 유의한 차이가 없었다. 3. I급 부정교합과 Ⅲ급 부정교합군의 수완부 골성숙 단계와 하악 제3대구치 석회화 단계 사이의 상관관계는 두 군모두 높은 상관성을 보였다(p<0.01). 4. I급 부정교합과 III급 부정교합군의 하악 제3대구치 석회화 단계와 연령사이의 상관관계는 두 군 모두 높은 상관성을 보였다(p<0.01). 이상의 결과로 수완부 골성숙도와 하악 제3대구치 발육은 I급 부정교합과 III급 부정교합군 간에 차이가 없었다.

• 구강회복응용과학지
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• 제39권4호
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• pp.204-213
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• 2023

구강 악안면 영역에서 외상으로 인해 발생한 골절에 대한 치료로 관혈적 혹은 비관혈적인 골절의 정복을 시행할 수 있다. 그러나, 최적의 정복이 이루어지지 않았거나 부정 유합이 발생할 경우, 하악골과 중안모 간의 구조적 관계가 상실되어 부정교합이 일어날 수 있다. 이러한 부정교합은 외상 후 부정교합이라 정의되며 안정적인 턱관절 위치의 확보 후 악교정 수술, 교정치료, 교합 재형성 및 보철적 재건 등이 외상 후 부정교합의 치료방법으로 제시되고 있다. 안정적인 턱관절은 교합 회복 전 부정교합의 재발 및 교합 변화를 방지하기 위해 필수적이며, 중심위 및 적응된 중심위는 가장 안정적인 턱관절의 위치로 교합 회복의 시작점이다. 본 증례는 다발성 안면 골절의 정복 후, 외상 후 부정교합이 발생하여 전악 교합의 회복을 위해 중심위에서 선택적 교합 조정 및 임플란트 지지 고정성 보철물로 보철적 재건을 시행한 증례로 교합 기능적으로 양호한 결과를 얻었기에 이를 보고하고자 한다.

• Imaging Science in Dentistry
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• 제47권2호
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• pp.93-97
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• 2017

Purpose: The purpose of this study was to evaluate the accuracy of panoramic imaging in measuring the right and left gonial angles by comparing the measured angles with the angles determined using a lateral cephalogram of adult patients with class I malocclusion. Materials and Methods: The gonial angles of 50 class I malocclusion patients (25 males and 25 females; mean age: 23 years) were measured using both a lateral cephalogram and a panoramic radiograph. In the lateral cephalograms, the gonial angle was measured at the point of intersection of the ramus plane and the mandibular plane. In the panoramic radiographs, the gonial angle was measured by drawing a line tangent to the lower border of the mandible and another line tangent to the distal border of the ascending ramus and the condyle on both sides. The data obtained from both radiographs were statistically compared. Results: No statistically significant difference was observed between the gonial angle measured using the lateral cephalograms and that determined using the panoramic radiographs. Further, there was no statistically significant difference in the measured gonial angle with respect to gender. The results also showed a statistically insignificant difference in the mean of the right and the left gonial angles measured using the panoramic radiographs. Conclusion: As the gonial angle measurements using panoramic radiographs and lateral cephalograms showed no statistically significant difference, panoramic radiography can be considered in orthodontics for measuring the gonial angle without any interference due to superimposed images.