• Journal of the Korean Orthopaedic Association
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• v.54 no.2
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• pp.141-149
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• 2019

Purpose: To compare the results of two different instruments made of stainless steel and titanium alloy for correction of single thoracic adolescent idiopathic scoliosis (AIS) using pedicle screw instrumentation. Materials and Methods: A total of 141 patients with single thoracic AIS treated with pedicle screw instrumentation and selective thoracic fusion were retrospectively reviewed after a follow-up of 2 years. The patients had a main thoracic curve of 40° to 75° and were divided into two groups based on instrument materials; S group (stainless steel, n=90) and T group (titanium alloy, n=51). The diameter of the stainless steel rod used was 7.0 mm while that of the titanium alloy rod was 6.35 mm or 6.0 mm. Standing long-cassette radiographic measurements including various coronal and sagittal parameters for the preoperative, early postoperative and 2-year postoperative followup were analyzed. There were no significant differences in the preoperative curve characteristics between the two groups. Results: In the S group, the preoperative main thoracic curve of 51.3°±8.4° was improved to 19.0°±7.6° (63.1% correction) and the lumbar curve of 32.3°±8.4° spontaneously decreased to 12.7°±8.2° (62.9% correction) at 2 years postoperatively. In the T group, the preoperative main thoracic curve of 49.5°±8.4° and the lumbar curve of 30.3°±8.9° was improved to 18.8°±7.4° (62.2% correction) and 11.3°±5.4° (63.3% correction), respectively. The corrections of coronal curves were not statistically different between the two groups (p>0.05). The thoracic kyphosis was changed from 16.8°±8.5° to 24.3°±6.1° in the S group and from 19.6°±11.2° to 26.6°±8.5° in the T group. There were no significant differences in the changes of sagittal curves, coronal and sagittal balances at the 2-year follow-up and the number of fused segments and used screws between the two groups (p>0.05). Conclusion: When conducting surgery for single thoracic AIS using pedicles screw instrumentation, two different instruments made of stainless steel and titanium alloy showed similar corrections for coronal and sagittal curves.

• The korean journal of orthodontics
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• v.29 no.4 s.75
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• pp.503-510
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• 1999

The purpose of this study is to investigate the negative effects of cervical pull headgear and to compare the differences between the two groups of growers-vertical grower and horizontal grower group-which are classified by the posterior-anterior facial height ratio. Initial and final lateral cephalograms were taken for 26 patients including 15 vertical growers and 11 horizontal growers ; also, 3 angular measurements and 4 linear measurements were evaluated. The following results were found. 1. The palatal plane was tipped anteroinferiorly in the vertical grower group. 2. The posterior facial height/anterior facial height ratio was increased in the horizontal grower group. 3. The Mandibular plane angle remained stable on both groups. 4. There was no significant difference between the two groups in the amount of maxillary molar extrusion.

• The Journal of Korea Assosiation for Disability and Oral Health
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• v.7 no.1
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• pp.21-24
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• 2011

Williams syndrome(WS) is a congenital disorder caused by a deletion of the Elastin gene and other contiguous genes at chromosome 7. Patients with WS are at a high risk of dental caries, and they also have a higher frequency of dental malocclusion compared to normal children. Malocclusion occurs in 85% of individuals with WS, which results from combined causes, such as tongue thrust, hypotonia, and connective tissue abnormality. An 11 year-old girl with WS presented scissor bite on the lower right second premolar and the first molar, and she complained of difficulty in chewing. Active lingual arch was used instead of removable appliance, considering the patient's cooperation ability. Unilateral posterior scissor bite was corrected in 7 months. Although patients with WS are sociable and friendly, dental treatment can be a fearful experience for them. Efforts to build rapport with the patients with WS resulted in improved relationship between the doctor and patient, and desired outcome of dental treatment was achieved with patient's improved cooperation.

• Journal of Periodontal and Implant Science
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• v.25 no.1
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• pp.99-110
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• 1995

치주치료의 궁극적 목표인 치주조직 재생에 대한 관심이 높아지는 가운데 치주조직 재생에 주된 역할을 하는 치주인대세포와 치근면 탈회에 의한 신부착 효과에 관한 많은 연구가 시도되고 있다. 그러나 광범위한 연구에도 불구하고 어떤 치근면 처리가 신부착 형성에 가장 효과적인지는 아직 논란의 대상으로 남아있다. 이에 저자는 결합조직 부착에 의한 재생에 필수적인 치은 및 치주인대 섬유아세포의 부착 및 증식을 tetracycline-HCL(TC)과 citric acid(CA)로 각각 처리된 상아질 표면에서 비교관찰하여 치주조직 재생에의 기여도를 추정하기 위해 본 연구를 시행하였다. 교정치료를 위하여 본원에 내원한 환자의 제일 소구치의 건강한 치은조직을 채취하고, 발치 후 효소처리에 의한 치주인대세포를 얻은 후 각각 세포배양하였다. 상아질 절편은 $3{\times}3{\times}0.2mm^3$로 준비하고 TC과 CA처리군으로 나눈 후 각각 치은 및 치주인대 섬유아세포를 부착시키고 초기부착은 8시간까지, 증식은 7일까지 고나찰하여 다음의 결과를 얻었다. 1. 각 군의 세포 부착은 시간이 지남에 따라 증가되었다. 2. 모든 군에서 7일째 빠른 증식상을 보였다. 3. 초기 부착시 치은과 치주인대 섬유아세포의 반응에는 유의한 차이가 없었다. 4. 반면에 치은과 치주인대 섬유아세포는 증식속도에서 차이를 나타내었으며 치은 섬유아세포가 좀 더 빠른 성장을 보였다. 5. 치근면 탈회에 따라 초기부착과 증식상에서 모두 유의성 있는 증가를 보였다. 6. CA는 초기부착에서, TC는 증식장에서 더욱 효과적으로 작용했다.

• The korean journal of orthodontics
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• v.35 no.1 s.108
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• pp.43-50
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• 2005

The purpose of this study was to evaluate the effects of a sealant resin on enamel demineralization In orthodontic bracket bonding. The forty eight extracted sound bovine teeth were subdivided into four groups and treated with Phase II (Reliance, itasca. III) on the surface Group 1 was not treated. Group 2 was acid etched with 37% phosphoric acid for 30 seconds. Group 3 was applied with sealant after acid etching. Group 4 was applied with resin paste after acid etching and sealant application. Each group was demineralized in artificial caries solution. Demineralized enamel depth was measured by confocal laser scanning microscopy. The results were as follows: the mean demineralized enamel depth was $47.4{\mu}m$. (Group 1), $61.8{\mu}m$ (Group 2), $13.9{\mu}m$ (Group 3). $8.2{\mu}m$ (Group 4) the demineralized enamel depth was increased in Group 2 than in Group 1 (p<0.05); the demineralized enamel depth was reduced in Group 3 than in Group 1 and Group 2 with statistically significant differences (p<0.05): and demineralization in Group 4 was very little. The results of the present study indicate that sealant application is useful for reducing enamel demineralization in orthodontic bracket bonding.

• The korean journal of orthodontics
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• v.27 no.2
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• pp.273-282
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• 1997

The purpose of this study was to evaluate changes in mandibular movement patterns after orthognathic surgery in skeletal Class III patients. The sample consisted of 20 Class III malocclusion patients(9 males, 11 females). Just before and after(2-7months) surgery, maximum opening & closing movement, mandibular border movement on sagittal, frontal and horizontal planes were recorded using Sirognathograph & BioPak EGN. On each record, 21 items were measured and statistically analyzed. The results were as follows 1. Angle of protrusive movement on sagittal plane showed greatest change after surgery. Also, as the incisal guidance was established by surgery, straight path of protrusive movement became curved line. 2. Maximum opening distance and maximum antero-posterior distance on maximum opening & closing movement, maximum opening distance on sagittal plane, angle of left lateral excursion on frontal plane were statistically significant after snrgery(p<0.01). 3. Maximum width of lateral excursion on frontal plane, distane of right lateral excursion and angle of maximum left lateral excursion on horizontal plane were statistiraily significant after surgery(p<0.05). 4. Maximum opening distance and maximum antero-posterior distance on maximum opening & closing movement showed significant differences according to post-surgical time(p<0.05). More recovery of range of movement occured in 5-7month group than in 2-3month group. 5. As the occlusal interferences were removed by orthognathic surgery, irregular opening & closing path became smooth curve.

• The korean journal of orthodontics
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• v.32 no.5 s.94
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• pp.361-373
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• 2002

The purpose of this study was to evaluate the morphological changes of olveolar bone and mandibular symphysis of lower incisor by presurgical orthodontic treatment and orthognathic surgery in skeletal class III malocclusion. The sample consisted of 30 adult class III malocclusion patients who have received bilateral sagittal split mandibular osteotomy. Lateral cephalograms were taken before treatment, after presurgical orthodontic treatment and 3 months after orthognathic surgery. Skeletal and symphyseal measurements were compared and the relationships between them were analysed. The results were as follow : 1. The labial and lingual alveolar bone height in presurgical and postsurgical group were decreased than that of pretreatment group. 2. The vertical measurements of the craniofacial skeleton showed reverse correlationship with anteroposterior width of basal alveolar bone, but IMPA showed correlatiionship (p<0.01) 3. The craniofacial skeleton and the change of symphyseal measurements(symphyseal length, symphyseal width) showed no correlationship. 4. The labial alveolar bone height showed correlationship with lingual alveolar bone height(p<0.001), and negative correlationship with lingual alveolar crestal width(p<0.01). Labial and lingual alveolar crestal width has negative correlationship (p<0.05). Mandibular symphyseal length and width has positive correlationship(p<0.01). 5. IMPA, LISA showed negative correlationship with labiolingual alveolar bone height and lingual alveolar width and positive correlationship with labial alveolar base bone width.

• The korean journal of orthodontics
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• v.36 no.4
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• pp.308-320
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• 2006

Rapid canine retraction, first introduced by Liou, is a distraction osteogenesis applied to the periodontal ligament tissue. Rapid tooth movement was facilitated by establishing minimal bony resistance on the distal surface of the canine by socket preparation and by osteogenesis on the mesial side in response to the periodontal distraction. Since undesired buccal tipping or extrusion of the canine during retraction tends to occur, it is crucial to maintain the firm path of movement and the axis of the canine during retraction. In order to improve the predictability of the canine movement, lingually extended distraction screws with heavy labial guiding wires were designed. Prefabricated plastic canine models for the estimation of socket depth and miniscrew implants for anchorage reinforcement were also devised. Applying these devices to a female patient with Class II anterior protrusion, the whole treatment was effectively finished in 13 months. Loss of vitality or periodontal problems did not occur throughout treatment, and stable occlusion was maintained during 10 months of retention. This case report demonstrates that a predictable rapid canine retraction can be achieved through the use of this modified technique.

• Journal of Chest Surgery
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• v.37 no.2
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• pp.193-196
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• 2004

Benign gastrobronchial fistula (GBF) after Ivor Lewis operation is a very rare and serious complication. We describe a patient with GBF who was successfully managed on the single-stage repair, 15 months after the Ivor Lewis operation. After the division of the GBF, the bronchial and gastric defects were closed directly. The omental flap and the pedicled 5th. intercostal muscle flap were interposed between the closed defects. The literature of this subject is reviewed and discussed.

• Journal of Yeungnam Medical Science
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• v.9 no.1
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• pp.189-196
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• 1992

Pre-surgical and post-surgical change in adult cleft lip and palate patient following Le Fort I advancement osteotomy combined with bone graft was evaluated clinically and cephalometically. We obtained a successful function and esthetic improvement. The bone graft of alveolo-palatal clefts provides a stable bone support to the adjacent teeth of the cleft area, and well union of adjacent bone tissue, the closure of oronasal fistula and improvement of speech problem. Le Fort I osteotomy following the ostectomy of nasal septum for advancement of the maxilla was obtained relative improvement of esthetics and functional occlusion. 1. The orthodontic correction was required before and after surgery. 2. In this case, there was a limited range of anterior advancement of the Premaxillary-segment due to the scar tissue. 3. After 8 months of operation, we could show the new bone deposition on the cleft site in dental radiograph and then the prosthetic treatement to the missing teeth was done.