• 대한치과교정학회지
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• 제27권2호
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• pp.209-219
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• 1997

본 연구는 골격성 III급 부정교합자에서 상하악절치의 치성보상 양상과 골격형태 사이의 상관관계를 규명하기 위해 시행되었다. 정상교합자 59명, 미약한 골격성 III급 부정교합자 91명 그리고 심한 골격성 III급 부정교합자 58명을 연구대상으로 선정하였으며 특히 미약한 골격성 III급 부정교합자는 전치부 반대교합의 유무에 따라 반대교합이 없는 군과 반대교합군으로 세분하여 연구하였다. 측모두부방사선규격사진을 15개의 골격 형태 계측항목과 16개의 상하악절치 경사도 및 위치 계측항목으로 분석한 뒤 통계 처리하여 다음과 같은 결과를 얻었다. 1. 각 군의 상하악 전치부 치성보상 양상을 보면 II-B군에 비해 II-A군과 III군의 상악 중절치는 순측경사 되어 있으며 II-A군이 III군 보다 크게 순측경사 되어 있었다. 하악절치는 II-A군과 II-B군에 비해 III군이 설측경사 되었으며 II-A군과 II-B군의 차이는 없었다. 2. II-A군과 II-B군 사이의 수직적인 골격형태 차이는 크지 않았고 하악절치 보다는 상악절치 위치 및 경사도에서 큰 차이를 보였다. 3. II- A군의 하악절치와 II-B군의 상악절치 계측항목이 골격형태와 상관성이 높았으며 특히 하악절치 계측항목중에서는 ∠IMPA, ∠FMIA, 상악절치 계측항목중에서는 ∠U1-FH, ∠U1-SN이 높은 상관성을 보였다. 4. 하악절치 계측항목중 ∠IMPA, ∠FMIA는 모든 군에서 골격형태와 높은 상관성을 보였다. 상악절치 계측항목중에서는 ∠U1-SN, ∠U1-FH, U1-facial plane(mm)이 다른 계측 항목에 비해 상관성이 높았다.

• 대한치과교정학회지
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• 제20권3호
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• pp.519-539
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• 1990

It is the aim of this study to observe the distribution of various facial types in class III malocclusion and to characterize the craniofacial features of the very facial types. Cephalometric headptates of a hundred and ten persons showing bilateral class III malocclusion whose mean age was 12.51 years and sixty nine persons of normal occlusion whose mean age was 12.23 years were measured and statistically analyzed. The following summary and conclusions were drawn. 1. Affording the bases for SNA and SNB, $35.45\%$ of sample showed normally positioned maxilla and protruded mandible, $30.00\%$ for retruded maxilla and normally positioned mandible, $15.45\%$ for retruded maxilla and protruded mandible, $10.90\%$ for both maxilla and mandible within normal range and $8.20\%$ for miscellaneous types were arranged in class III malocclusion. 2. $52.72\%$ of sample showed neutrodiveigent, $35.45\%$ for hyperdivergent and $11.81\%$ manifested hypodivergent mandible in class III malocclusion. 3. Providing the bases for facial and mandibular planes, $33.63\%$ of sample showed prognathic and neutrodivergent, $20.90\%$ for mesognathic and hyperdivergent, $17.27\%$ for prognathic and hyperdivergent and $15.45\%$ for mesognathic and neutrodivergent were arranged in class III malocclusion. 4. The class III malocclusion brought out shorter cranial base, smaller saddle angle, and larger articular and genial angle. It showed retropositioned maxilla and forward positioned mandible in spite of no significant differences in linear measurements of mandible. Anterior lower facial height was significantly larger in class III malocclusion, while posterior total facial and anterior total facial heights exhibited no significant differences. 5. It is suggested class III malocclusion was attributed to shorter cranial base, smaller saddle angle, maxillary deficiency and/or retrusion, mandibular excess and/or protrusion, excessive vertical growth of the anterior lower face, and their complex as well.

• 대한치과교정학회지
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• 제26권3호
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• pp.247-254
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• 1996

골격성 III급 부정교합자의 설골 위치와 기도를 평가하고 이들 사이의 상관관계를 알아보기 위해 부산대학교병원 치과교정과에 내원한 16세 이상의 환자 47명과 치과대학에 재학중인 학생 44명을 대상으로 측모 두부방사선규격사진을 촬영하고 설골의 위치에 대한 전후방적, 수직적 거리 및 각도와 기도의 크기, 하악의 위치에 대해 통계적으로 분석하여 다음과 같은 결론을 얻었다. 1. S-APH, A-APH, N-APH, LAH-PBR, AA-PNS, PNS-ad는 I급 부정교합군과 III급 부정교합군 사이 에 유의한 차이를 보였다. 2. 설골은 III급 부정교합군에서 더 전방에 위치하였으며 경조직 기도 크기는 III급 부정교합군에서 I급 부정 교합군보다 더 작게 나타났다. 3. 다수의 계측치, 특히 설골의 수직적 및 각도 계측치와 기도 크기가 남성과 여성에서 유의한 차이를 보였다. 대개 남성에서 여성보다 수치가 크게 나타났다. 4. 설골의 위치와 기도 크기 사이에 유의한 상관관계는 없었으며 하악의 위치와 기도 크기 사이에도 유의한 상관관계는 없었다. 5. S-APH는 W its appraisal과 역상관관계를 보였으며 A-APH, N-APH는 Wits appraisal과 순상관관계를 보였다. 설골의 수직적 계측치는 하안모 고경과 순상관관계를 나타냈다.

• 대한치과교정학회지
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• 제14권1호
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• pp.151-160
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• 1984

This study was designed to get the informations of the mesiodistal axial inclinations of the posterior teeth and of the relationships between these and other angular measurements of facial bony structures in normal occlusion and malocclusion groups using lateral roentgenocephalograms. The subjects consisted of 73 normal occlusions (31 males 42 females), 38 Class II Division 1 malocclusions (17 males 21 females) and 47 Class III malocclusions (19 males 28 females). The findings of this study are as follows : 1. In mandible, the posterior teeth axes of Class II Division 1 malocclusion group were inclined more mesially and those of Class III malocclusion group were inclined more distally than normal occlusion group. In maxilla, Class II Division 1 malocclusion group showed more distal inclination and Class III malocclusion group showed more mesial inclinaton of 1st, 2nd premolars and more distal inclination of 1st, 2nd molars than those of the normal occlusion group. 2. There was a tendency for teeth axes to maintain nearly the same inclination in relation to occlusal plane irrespective of various OMA and OPA in each group. 3. F M A, P M A and O P A were the largest in Class II Division 1 malocclusion group and O M A, GoA were the largest in Class 111 malocclusion group. 4. There were high correlationships between mandibular teeth inclinations related to mandibular plane and 4 angular measurements except OPA, and between maxillary teeth inclinations related to palatal plane and OPA.

• Imaging Science in Dentistry
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• 제33권2호
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• pp.85-90
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• 2003

Purpose : To investigate the differences between the position of the mandibular condyles in temporomandibular joints of patients presenting with normal occlusion and skeletal class III malocclusion. Materials and Methods: Forty-two subjects with normal occlusion and thirty-seven subjects exhibiting skeletal class III malocclusion prior to orthodontic treatment were included in the study. Transcranial radiographs of each subject were taken at centric occlusion and 1 inch mouth opening. The positional relationship between the mandibular condyles with articular fossae and articular eminences at two positional states were evaluated and analyzed statistically. Results: The mandibular condyles of the skeletal class III malocclusion group were found to be located more anteriorly from the center of the articular fossae compared to the normal occlusion group in centric occlusion. The mandibular condyles of the skeletal Class III malocclusion group were located more superiorly from the middle of articular height than those of the normal occlusion group in centric occlusion. However, these differences were not statistically significant. At 1 inch mouth opening, the mandibular condyles of the skeletal class III malocclusion group were placed more posteriorly from the articular eminences than those of the normal occlusion group. The mean angle of the articular eminence posterior slope were 56.51 ° ± 6.29° in the normal occlusion group and 60.37° ± 6.26° in the skeletal Class III malocclusion group. Conclusions: The mandibular condyles of the skeletal Class III malocclusion group were placed more anteriorly at centric occlusion and more posteriorly at 1 inch mouth opening when compared with those of the normal occlusion group.

• 대한치과교정학회지
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• 제20권1호
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• pp.123-133
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• 1990

The work was undertaken to evaluate the calcification of the second and the third molars in skeletal Class II and III malocclusions. The differences in the calcification stages between skeletal Class II and III malocclusion were evaluated and statistically analysed from panoramic radiographs of 202 males and females ranging in age from 11 to 15 years old. The results were as follows, 1. The calcification stages of the second and the third molars were not different between the skeletal Class II and III malocclusions in each age groups of both sexes. 2. The calcification stages of lower second and third molars of the skeletal Class III malocclusion are more advanced than those of the skeletal Class II malocclusion in male. 3. The clacification stages of upper second and third molars are more advanced than those of lower second and third molars in skeletal Class II malocclusion. 4. The calcification stages of lower second and third molars are more advanced than those of upper second and third molars in skeletal Class III malocclusion.

• 대한치과의사협회지
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• 제19권12호통권151호
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• pp.1027-1030
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• 1981

2065 patients who visited orthodontic department form 1977. 7. 16. to 1981. 9. 30. were surveyed on the yearly tendency of patient distribution and the state of Angle's Classification. The results were as follows: 1. There was increased visiting rate of patient per year except the year 1980. 2. 8-13 age group was 55% in total visiting patient and 20 age over group was 11.0%. 3. Class I malocclusion was 42.3% in total visiting patient, more Class III malocclusion was prevalent than Class II malocclusion.

• 대한치과교정학회지
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• 제11권2호
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• pp.101-108
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• 1981

This investigation was designed to compare the calcification degree of maxillary second permanent molar to mandibular second permanent molar in skeletal Class III Malocclusion. The material selected for this study consisted in standand lateral cephalogram study model and orthopantomogram of two hundred fifty seven Korean Children, one hundred twenty one boys and one hundred twenty four girls, aged 6 through 12 years, having skeletal Class III Malocclusion. On the basis of findigs of this study, the following results were obtained 1. In the stage of completion of crown, there was no significant difference in calcification degree between maxillary second molar and mandibular second molar of both boys and girls in skeletal Class III Malocclusion. 2. From 8 years of age at the stage of beginning root formation to 12 years of age, the calcification degree of mandibular second molar was more advanced than Maxillary second molar of both boys and girls in skeletal Class III Malocclusion.

• 대한치과교정학회지
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• 제24권4호
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• pp.819-826
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• 1994

This study was designed to get the knowledges of the ideal arch form of the class I malocclusion patients of Koreans with first premolar extraction. The subjects consisted of 98 individuals with class I malocclusion with first premolar extraction. The results were as follows ; 1 Author found the ideal arch shape of the class I malocclusion patients with first premolar extraction. 2. Equations of ideal arch form of the class I malocclusion patients with first premolar extraction were obtained from SPSS.

• 대한치과교정학회지
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• 제18권1호
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• pp.227-234
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• 1988

To study diagnosis and treatment plan of malocclusion, comparison of race and nation and consideration of treatment technique, 885 orthodontic patients of the department of orthodontics, Infirmary of dental college, Chosun University were evaluated. The frequency and pattern of tooth extraction were studied according to malocclusion types and developmental stages of occlusion and sex. Thefollowingresultswereobtained. 1. Average frequency of tooth extraction for orthodontic treatment was $38.3\%$. 2. The frequency of tooth extraction was $43.7\%$ in class I malocclusion, $34.2\%$ in class II malocclusion and $32.1\%$ in class III malocclusion. 3. The drequency of tooth extraction was the highest in permanent dentition $(49.2\%)$. 4. The frequency of tooth extraction was not different between male and female. 5. The frequency of 3-4 premolars extraction was the highest $(57.5\%)$ and that of lower incisor extraction was the lowest $(2.9\%)$ in patterns of tooth extraction. 6. Both frequency of unilateral and single arch extraction were the highest in class III malocclusion.