• The korean journal of orthodontics
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• v.24 no.3 s.46
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• pp.555-567
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• 1994

The purpose of this study is to observe the effect of high pull headgear on the craniofacial structures of mixed dentition with Class II malocclusion. The cephalometric headplates of 16 children treated by high pull headgeaar during 6 months and 18 children during 12 months were traced, digitized and statistically analyzed. The results were as follows. 1. Inhibition of foreward growth of maxilla was observed in both group. 2. Clockwise rotation of maxilla was observed in both group. 3. There were distal movement of maxillary 1st molar and inhibition of alveolar bone growth of maxilla. 4. There was compensatory extrusion on mandibular 1st molar. 5. The ratio of anterior facial height to posterior facial height was almostly not changed. In the treatment plan of C II malocclusion by high pull headgear, ire must prevent the mandibulasr 1st molar from extruding and for orthopedic effect, at least 6 months is needed.

• The korean journal of orthodontics
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• v.47 no.6
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• pp.394-400
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• 2017

Assessing the condition of the alveolar bone before and after orthodontic treatment is important. Recently, cone-beam computed tomography has been widely accepted as a useful tool for orthodontic treatment. Moreover, using a three-dimensional (3D) structural analysis software enables gathering detailed information and quantifying data. The aim of this study was to introduce various quantitative analyses performed before and after orthodontic treatment by using a 3D structural analysis software for evaluating the morphological condition of the alveolar bone of a patient with gingival recession around the canines.

• The korean journal of orthodontics
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• v.47 no.6
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• pp.384-393
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• 2017

Fusion of teeth is a developmental anomaly. It occurs at the stage of tooth formation, which determines the shape and size of the tooth crown, when one or more teeth fuse at the dentin level during the morphodifferentiation of the dental germs. Such teeth show macrodontia and may cause crowding, as well as esthetic and endodontic problems. In this article, we report a rare case of a maxillary central incisor fused to a supernumerary tooth showing labial and palatal talon cusps, which was orthodontically moved across the midpalatal suture. A 13-year-old Caucasian boy sought treatment for the unesthetic appearance of his maxillary central incisor and anterior crowding. He was rehabilitated successfully via a multidisciplinary approach involving orthodontic, nonsurgical endodontic, periodontal, and prosthodontic treatments. After a 26-month treatment period, the patient's macroesthetics and microesthetics were improved. The overall improvement of this macrodontic tooth and its surrounding tissues through multidisciplinary treatment was documented using cone-beam computed tomography.

• The korean journal of orthodontics
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• v.21 no.2 s.34
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• pp.447-455
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• 1991

This research was carried out in order to study the effects of Rapid Maxillary Expansion on maxilla and it's surrounding skeletal structures. The sample for this study consists of 14 patients who were in retention period after rapid maxillary expansion. Following results were obtained after performing comparative analysis of cephalograms taken before and after rapid maxillary expansion. 1. In almost every cases, inferior displacement of palatal planes with concurrent changes in their inclination were observed. 2. Changes in the inclination of palatal plane can be categorized into inferiorty inclined group, superiorly inclined group and constant group in relation to the states before rapid masillary expansion. 3. Decrease in < Se-FMN/PMV and increase in < Se-FMN-A were evident in the superiorly inclined group and vice versa for the inferiorly inclined group.

• The korean journal of orthodontics
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• v.25 no.6 s.53
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• pp.733-746
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• 1995

In narrow maxillary arch, midpalatal suture can be readily opened in growing children with maxillary palatal expansion. In adult patients, narrow maxilla is generally treated surgically because their growth are deemed completed due to their age. However, in patients under 25, midpalatal suture may not be closed. In addition, maxillary expansion may depend upon the closure of other maxillary sutures, which generally remain open at this stage. The present study attempted suture openings with palatal expansion on 5 female patients in their early 20's. The opening was successful in 4 patients, while only one patient showed no suture opening. In all 4 subjects, no discomfort or pain was present during s\expansion, and the successful suture opening was confirmed on occlusal x-rays. Therefore, for those patients with narrow maxilla in their early 20's, rapid palatal expansion or slow palatal expansion may offer a simple and less complicated option which, if successful, may preclude the need for surgery and thereby circumvent the psychological and financial burdens for the patients.

• The korean journal of orthodontics
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• v.7 no.1
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• pp.7-11
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• 1977

The purpose of this study was to investigate the resorption potential in human permanent teeth by analyzing the frequency and the degree of root resorption as revealed by routine intraoral roentgenograms. The following conclusions were obtained: 1) The distribution of root resorptions was as follows; a) 65.3 per cent were no root resorption. b) 7.0 per cent showed questionable root shortening. c) 25.2 per cent were definite root shortening. d) 2.5 per cent showed very severe resorption. 2) The order of susceptibility of teeth to resorption in this study was consistent with other studies. 3) The maxillary teeth showed a much higher incidence (52.2 per cent) than the mandibular teeth (17.1 per cent) 4) The sex ratio of the sample in this study was 1.3 female to 1 male.

• The korean journal of orthodontics
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• v.33 no.5 s.100
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• pp.391-398
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• 2003

Distraction osteogenesis is a well-estabilished procedure of membraneous bone formation and has been used to correct craniofacial deformities in dentofacial orthopedic-surgery area for decades. In this articale, distraction osteogenesis is used for treatment of facial asymmetry. The patient underwent procedures to lengthen the mandibular ramus and body. After distraction, orthodontic treatment was done for ooclusal settling.

• The korean journal of orthodontics
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• v.10 no.1
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• pp.65-70
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• 1980

The purpose of this study was giving some helpful datas in analysing the degree of anteroposterior jaw disharmony with the 'Wits' appraisal. The cephalograms of 105 Korean adults with normal occlusion ranging from 17 to 20 years of age and 76 Koreans with various malocclusion ranging from 12 to 24 years of age were studied and analyzed statistically. The results were as follows; 1. The mean value of 'Wits' appraisal in normal occlusion group was -0.82mm in males and -0.17mm in females. 2. There was no significant difference between the males and females in normal occlusion group. 3, The mean value of 'Wits' appraisal in Angles class II malocclusion group was 2.67mm and higher than normal group. 4. The mean value of 'Wits' appraisal in Angles class III malocclusion group was -8.11 mm and lower than normal group.

• The korean journal of orthodontics
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• v.13 no.2
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• pp.185-192
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• 1983

The purpose of this study was to determine the mean value of overbite and overjet, and to find the correlation among overbite, overjet and relative maxillofacial structures using the data from orthodontic casts and cephalometric films of boys and girls aged from 9 to 18 years with normal occlusions. The results were obtained as follows: 1. Incisal overbite depth was decreased from Group I to Group III. 2. The highest value of correlation coefficient with incisal overbite was 0.368 of incisal angle. in Group III. 3. Overjet was not significantly correlated with the age and sex. 4. Ratio of mesiodistal diameters of upper and lower incisors was not significantly correlated with overbite and overjet.

• The korean journal of orthodontics
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• v.13 no.2
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• pp.205-208
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• 1983

Widths between the first permanent molars and the mesio-distal widths of the four anterior teeth were measured on 32 lower and 33 upper dental casts of young adults aged 18-25 yerars. The casts were grouped in five categories-two where no anterior crowding existed, and three in which varying degrees of crowding were present. Subjects with a difference between arch width and anterior tooth widths greater than 4mm in the upper arch, or 10mm in the lower arch, rarely had crowding. As arch width changes very little from age 7 onwards, measurements at this age may be used as a screening mechansim for future arch crowding.