• Journal of the korean academy of Pediatric Dentistry
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• v.37 no.2
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• pp.202-206
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• 2010

There are various local and systemic factors which alter the rate of tooth eruption movement. Thyroid hormone has been reported to have proportional relationship with the rate of tooth eruption. The main function of thyroid hormone is the regulation of basal metabolism, but it also affects the rate of tooth eruption. In this report, we will present a case of an 11-year-old girl, who showed sudden increase in orthodontic tooth movement of the impacted canine at certain points, which coincided with the hyperthyroid period. It shows possible relationship between the serum level of thyroid hormone and the rate of orthodontic tooth movement.

• The korean journal of orthodontics
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• v.35 no.3 s.110
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• pp.196-206
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• 2005

This study was undertaken to investigate the effect of vitamin C deficiency on the orthodontic tooth movement and bony remodeling processes. Thirty six male guinea pigs were divided on the basis of the given amount of vitamin C (normal group: 5mg/day, deficient group: 0.2mg/day) and 75gm of force was applied to the maxillary incisors. Experimental animals were sacrificed at day 0. day 1 day 3, day 5. day 7 and day 14 after force application and the amount of tooth movement was measured and tissues were studied histologically. The results showed that the amount of collagen fiber in the periodontal ligament and alveolar bone of the deficient group was less than that of the normal group. In the stretched side. the osteoblastic activity and alveolar bone formation of the normal group increased in a time dependent manner during experimental periods, but the deficient group showed less activity and formation. The amount of tooth movement in the deficiency group was more than in the normal group at day 0. day 1, day 3, day 5, and day 7. According to the above results, a deficiency of vitamin C resulted in a defect of collagen synthesis of the periodontium and inhibition of bone formation and stimulation of bone resorption with rapid tooth movement in early periods of force application.

• The korean journal of orthodontics
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• v.30 no.1 s.78
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• pp.9-17
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• 2000

This study was performed to compare and analyze the mode of tooth movement according to the timing of orthodontic force application alter extraction. The upper right and left third incisors were carefully extracted at three-week interval in lout adult dogs. Both canines were used as an anchorage for the bodily movement of the upper second incisors. Orthodontic forte of 100 gm was simultaneously applied at one week after extraction on one side and four weeks after extraction on the other side using NiTi closed coil spring. While orthodontic force was applied for twelve weeks, the amount of tooth movement was measured at every second week with digital calipers. The animals were sacrificed at twelve weeks and histologic examination was executed to reveal any difference between both sides. The results were obtained as follows. 1. The tooth movement was likely to be faster in lout-week side 4han one-week side for the first two weeks while faster in one-week side during next two weeks 2. The rate of tooth movement was fastest during four to six weeks period, then decreased gradually. 3. The total amount of tooth movement was likely to be larger in one-week side compared to four-week side. 4. Any damage to tooth and periodontal tissue could not be seen in the histologic section of one-week side. These results suggest that earlier application of orthodontic force is better than later after extraction In terms of the rate of tooth movement.

• The korean journal of orthodontics
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• v.29 no.5 s.76
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• pp.551-562
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• 1999

This study was undertaken to investigate the relation between orthodontic force magnitude and the amount of tooth movement. And more light force application for reducing root resorption Twenty-four rats were divided into three experimental groups(A, B, C) based on force magnitude and application method. Springs of 50g force were applied to A group, springs of 100g force were applied to B group and springs of 25g force were applied to C group initially, and after 4 days springs of C group were changed to springs of 50g force. Two kinds of $sentally^{(R)}$(GAC U.S.A.) closed coil spring, 50g and 100g, were used. And we made 25g springs by heat treatment process of 50g springs. Each spring was inserted between the maxillary central incisor and the maxillary left first molar. Amounts of tooth movement were measured everyday by digital caliper($Digimatic^{(R)}$, Mitutoyo, Japan) under inhalation anesthesia for 15 days. After 15 days, all rats were sacrificed and histological samples were obtained with Hematoxyline-Eosin stain and Masson's trichrome stain. Following conclusion were made; 1. Group B showed the mean cumulative tooth movement of $2.19{\pm}0.41mm$ at 15th day, which was greatest among three groups, followed by group C($2.06{\pm}0.10mm$), group A($1.90{\pm}0.49mm$) respectively. however, there was no statistically difference among three groups. 2. All groups showed general tooth movement pattern and A, B, C group finished lag phase at 9th, 8th, 7th day, but there was no statistical significance. 3. Group A,B,C showed root resorption and especially group B showed the most severe root resorption and group C showed milder root resorption than other groups. According to the above results, large initial force with the development of a flirty widespread hyalinized zone may cause severe root resorption, so initial force should be applied lightly to reduce hyalinized area and eventually root resorption and then increased force will induce efficient tooth movement.

• Journal of the korean academy of Pediatric Dentistry
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• v.35 no.4
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• pp.737-743
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• 2008

Regional odontodysplasia is a relatively rare developmental anomaly of dental hard tissue with characteristic clinical, radiographic and histologic features. It requires a continuous and multidisciplinary approaches, and the aim of treatment for these patients should include aiding mastication, improving aesthetics, maintaining normal vertical dimension and space, allowing normal jaw growth and eruptional management of affected teeth. This report describes three cases of regional odontodysplasia with 2-5 years of follow-up. Conservative treatment is chosen to preserve the affected teeth as long as possible, and periodic radiographic and clinical examination was done. During this time, all teeth except one showed progressive development. An interesting finding observed in our cases was that each tooth even in the same person showed different degree of tooth development and eruption rate. Thus, we colcluded that the treatment plan for regional odontodysplasia should be conservative and individualized and based on the assessment of each tooth.

• The korean journal of orthodontics
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• v.38 no.3
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• pp.187-201
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• 2008

Objective: The aim of this study was to determine whether cortical punching stimulates the expression of matrix metalloproteinase-1, -8, and -13 in orthodontic tooth movement in rats. Methods: A total of 32 male sprague-dawley rats at 15 weeks old were divided into two groups of 16 rats each, to form the tooth movement with cortical punching (TMC) group and tooth movement only (TM) group. A total of 20 gm of orthodontic force was applied to rat incisors to cause experimental tooth movement. Cortical punching was performed on the palatal side near the central incisor with a 1.0 mm width microscrew in the TMC group. The duration of tooth movement was 1, 4, 7, and 14 days. Results: Measurements of the mRNA expression were selected as the means to determine the identification of expression of MMP-1, -8, and -13. In the TMC group, the expression of collagen type I was greater than that of the TM group from day 4 to day 14. Expression of TIMP-1 in the TM group was greater than that of the TMC group in the pressure side of PDL and alveolar bone cell at day 4. In the TMC group, TIMP-1 was expressed at the osteoclast, but not at the tooth surface of the TM group at day 14, Maximum induction of the mRNA of MMP-1 was observed on day 4 in the TMC group, but it was observed on day 7 in the TM group. MMP-8 mRNA of the TMC group was twice greater than that of the TM group at f days. In the TMC group, maximum induction of MMP-13 mRNA was observed on day 1. Conclusions: These findings suggested that cortical punching can stimulate remodeling of PDL and alveolar bone connective tissues during experimental orthodontic tooth movement in rats.

• The Journal of Korean Academy of Prosthodontics
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• v.37 no.4
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• pp.399-415
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• 1999

임플랜트 보철 환자의 하악 운동에 관한 연구를 위해 완전 고정성 보철 치료를 한 8명의 환자와 상하악 총의치를 장착한 8명의 환자, 그리고 5명의 자연치아 피검자를 대상으로 Sirognathograph(Siemens, Benshiem, Germany)와 BioPAK program(BioResearch, Milwaukee, U.S.A.)으로 한계운동과 당근시편에 대한 편측 저작운동에 대한 검사를 시행하였다. 편측 저작 운동은 전두면에서의 저작운동의 높이와 폭, 전두면에서의 저작각도, 시상면에서의 절치기준점의 최대 이동거리, 시상면에서의 저작운동의 전후방 이동거리, 최대개구속도, 최대폐구속도의 기준점으로 각 저작주기의 성적을 평균처리 하여 다음과 같은 결론을 얻었다. 1. 전두면에서의 저작운동의 높이는 자연치, 총의치, 임플랜트 군간에 유의성있는 차이가 없었다(p>0.05). 2. 전두면에서의 저작운동의 폭은 임플랜트 군이 자연치, 총의치 군에 비해 유의성있게 작은 수치를 보였다(p<0.05). 3. 전두면에서의 저작각도 분석시 임플랜트 군과 자연치 군, 임플랜트 군과 총의치 군간에 유의성있는 차이가 없었다(p>0.05). 4. 시상면에서의 절치기준점의 최대 이동거리 분석시 임플랜트 군과 자연치 군, 임플랜트 군과 총의치군간에 유의성 있는 차이가 없었다(p>0.05). 5. 시상면에서의 전후방이동거리는 자연치 군이 임플랜트 군, 총의치 군에 비해 유의성 있게 크게 나타났다(p<0.05). 6. 최대개구속도는 자연치 군이 총의치 군과 임플랜트 군에 비해 유의성 있게 작은 수치를 보였다(p<0.05). 7. 최대폐구속도는 각 군간에 유의성 있는 차이가 없었다(p>0.05). 8. 저작운동은 개인간의 차이가 커서 명확한 결론을 유추하기가 어려웠다.

• The Journal of the Korean dental association
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• v.23 no.1 s.188
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• pp.35-40
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• 1985

수술과 교정의 혼합술식으로 안면부의 기형과 부수적으로 발생하는 부정교합을 치료하는 경향이 점차적으로 증가하고 있다. 수술-교정 술식은 과거 20년동안, 특히 1970년대에 무척 빠른 속도로 발전하였다. 수술-교정 술식이 발달함에 따라 이전에는 수술이나 교정치료 단독으로는 치료하기가 어려웠던 case들의 치료가 가능하게 되었다. 교정의사들은 성장이 완료된 성인의 심한 skeletal dysplasia를 치아이동에 의해서만 치료하는 데에는 매우 제한이 많다는 것을 인식하게 되었으며, 반면에 구강외과 의사들은 수술전후의 교정치료에 의해 더욱 좋은 수술 결과를 얻을 수 있는 동시에 좋은 functional occlusion을 이룰수 있다는 사실을 인식하였다. 이러한 수술-교정 술식은 교정의사들과 구강외과의사들에게 새로운 면들을 요구하고 있다. 좋은 치료결과를 얻기 위해서는 교정의사와 구강외과의사간의 긴밀한 협조관계가 필수적이다. 이러한 협조관계를 유지하기 위하여는 서로 상대 전문분야의 용어, 진단원리, 치료기법 등에 대한 이해가 선행되어야 한다. 이 논문에서는 진단, 치료계획, 수술전 교정치료, 수술술식, 수술후 교정치료, 증례보고의 순서로 기술하려 한다.

• The Journal of the Korean dental association
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• v.22 no.10 s.185
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• pp.847-853
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• 1984

수술과 교정의 혼합술식으로 안면부의 기형과 부수적으로 발생하는 부정교합을 치료하는 경향이 점차적으로 증가하고 있다. 수술 - 교정 술식은 과거 20년동안, 특히 1970년대에 무척 빠른 속도로 발전하였다. 수술 - 교정 술식이 발달함에 따라 이전에는 수술이나 교정치료 단독으로는 치료하기가 어려웠던 case들의 치료가 가능하게 되었다. 교정의사들은 성장이 완료된 성인의 심한 skeletal dysplasia를 치아이동에 의해서만 치료하는 데에는 매우 제한이 많다는 것을 인식하게 되었으며, 반면에 구강외과 의사들은 수술전후의 교정치료에 의해 더욱 좋은 수술 결과를 얻을 수 있는 동시에 좋은 functional occlusion을 이룰수 있다는 사실을 인식하였다. 이러한 수술 - 교정 술식은 교정의사들과 구강외과의사들에게 새로운 면들을 요구하고 있다. 좋은 치료결과를 얻기 위해서는 교정의사와 구강외과의사간의 긴밀한 협조관계가 필수적이다. 이러한 협조관계를 유지하기 위하여는 서로 상대 전문분야의 용어, 진단원리, 치료기법 등에 대한 이해가 선행되어야 한다. 이 논문에서는 진단, 치료계획, 수술전 교정치료, 수술술식, 수술후 교정치료, 증례보고의 순서로 기술하려 한다.

• The Journal of the Korean dental association
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• v.22 no.9 s.184
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• pp.751-756
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• 1984

수술과 교정의 혼합술식으로 안면부의 기형과 부수적으로 발생하는 부정교합을 치료하는 경향이 점차적으로 증가하고 있다. 수술 - 교정 술식은 과거 20년동안, 특히 1970년대에 무척 빠른 속도로 발전하였다. 수술 - 교정 술식이 발달함에 따라 이전에는 수술이나 교정치료 단독으로는 치료하기가 어려웠던 case들의 치료가 가능하게 되었다. 교정의사들은 성장이 완료된 성인의 심한 skeletal dysplasia를 치아이동에 의해서만 치료하는 데에는 매우 제한이 많다는 것을 인식하게 되었으며, 반면에 구강외과 의사들은 수술전후의 교정치료에 의해 더욱 좋은 수술 결과를 얻을 수 있는 동시에 좋은 functional occlusion을 이룰수 있다는 사실을 인식하였다. 이러한 수술 - 교정 술식은 교정의사들과 구강외과의사들에게 새로운 면들을 요구하고 있다. 좋은 치료결과를 얻기 위해서는 교정의사와 구강외과의사간의 긴밀한 협조관계가 필수적이다. 이러한 협조관계를 유지하기 위하여는 서로 상대 전문분야의 용어, 진단원리, 치료기법 등에 대한 이해가 선행되어야 한다. 이 논문에서는 진단, 치료계획, 수술전 교정치료, 수술술식, 수술후 교정치료, 증례보고의 순서로 기술하려 한다.