• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.341-346
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• 1999

본 연구는 악교정 환자 중 9명의 골격성 3급 부정교합 환자를 대상으로 음향학적 분석을 통하여 술전, 술후에 나타나는 발음상의 차이를 살펴보았다. 술전, 술후간 모음 조음상의 차이는 술후 혀의 후방, 하방 이동과 동시에 목젖의 후상방 이동으로 인한 구강 내 조음 공간의 극대화로 요약할 수 있다. Long-term average 스펙트라 분석 결과, /ㅅ/의 조음상의 차이는 술전에서는 마찰소음 에너지가 전 주파수대에 걸쳐 고른 분포를 보이나 술후에는 정상인과 같이 고주파수대에 집중되는 경향을 보였다. 동시에 마찰소음의 peak frequency는 술후에서가 술전에 비해 높게 나타났다.

• The korean journal of orthodontics
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• v.33 no.1 s.96
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• pp.1-9
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• 2003

The purpose of this study was to find out and evaluate discrepancies between preorthodontic prediction values and actual postorthodontic values and factors contributing to it in 45 patients(17 male, 28 female) who were diagnosed as skeletal Class III ma)occlusion and received presurgical orthodontic treatment and orthognathic surgery at Yonsei university dental hospital. Lateral cephalograms were analysed at pretreatment(T1), orthodontic Prediction(T2), immediately before surgery(T3) and designated the landmark as coordinates or X and Y axes. The samples were divided according to ALD, upper and lower incisor inclination(Ul to SN, IMPA), COS, extraction, the position of extracted teeth and the statistical significance was tested to find out the factors contributing to the prediction. The results were as follows: 1. Differences between preorthodontic prediction values and actual postorthodontic values(T2-T3) were statistically significant(p<0.05) in the x coordinates of U6mbc, L1x and in y coordinates of U1i, U1x, U6me, U6mbc, L6mbc 2. The accuracy of prediction is relatively higher in horizontal changes compared to vortical changes. 3. The statistical significance(p<0.05) between prediction and actual values is observed more in the landmarks of the maxilla than the mandible. 4. Differences between prediction and actual values of incisor and first molar were statistically significant(p<0.05) according to extraction vs non-extraction, extraction type, ALD in the maxilla and according to ALD, IMPA in the mandible. Discrepancies between preorthodontic prediction values and actual postorthodontic values and factors contributing to the prediction must be considered in treatment planning of Cl III surgical patients to increase the accuracy of prediction. Furthermore future investigations are needed on the prediction of vortical changes.

• The korean journal of orthodontics
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• v.28 no.5 s.70
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• pp.741-750
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• 1998

This study was designed to evaluate the Personality characteristics of orthognathic surgery patients preoperatively and postoperatively through the MMPI. Comparison was made between the personality characteritics of preoperative and postoperative groups. Motivation for undergoing orthognathic surgery and postoperative satisfaction were examined through the questionnaire. Subjects used in this study consisted of 50 patients under presurgical orthodontic treatment and 22 patients who had received orthognathic surgery. From this study, the results were followings. 1. In preoperative patients group, all T-scores were within the normal range except for K-scale. The T-score of K-scale is 57.7, this showed that these patients underwent some or less stress. 2. In postoperative patients group, all T-scores were within the normal range. 3. Only in K-scale, there was statistically significant increase after surgery (p<0.05). 4. In male patients group, all T-scores were within the normal range except for that of preoperative K-scale. Postoperatively, there were statistically significant increase in K and Hs scales(p<0.05) 5. In female patients group, all T-scores were within the normal range. 6. Motivation for undergoing orthognathic surgery could be divided into 4 categories. esthetic goal($28.2\%$), functional goal($32.1\%$), TMJ problem($9.0\%$), and psychosocial reason($30.7\%$). 7. The degree of postoperative satisfaction was quite high($85.7\%$). $14.3\%$ of all patients were very satisfied, $71.4\%$ were satisfied, $9.5\%$ were neither satisfied or dissatisfied, and $4.8\%$ were very dissatisfied.

• The korean journal of orthodontics
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• v.28 no.2 s.67
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• pp.231-236
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• 1998

This study was undertaken to evaluate the psychosocial status of the preoperative orthognathic surgery patient through SCL-90-R. Subjects used in this study were composed of 67 patients under presurgical orthodontic treatment. Males are 40 and females are 27. Comparison between the personality characteristics of male and female patients was made by the t-test. From this study, the results were as follows. 1. In preoperative patients group, all T-scores were within the normal range. 2. In male patients group, all T-scores were within the normal range. 3. In female patients group, all T-scores were within the normal range. 4. Only in PHOB scales, the T-scores of male patients group were higher than those of female patients group. 5. Although all T-scores were within the normal range,9 patients($13.4\%$ of all patients) shows abnormal T-scores in at least one scale.($T{\geqq}65$)

• Proceedings of The Korean Cleft Lip And Palate Association
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• 2004.06a
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• pp.29-32
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• 2004

• The korean journal of orthodontics
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• v.35 no.1 s.108
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• pp.23-34
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• 2005

Collective changes caused by orthodontic tooth movement evaluated in a specific treatment modality could give suggestive information on the specific treatment strategy. The aim of this study was to investigate retrospectively the characteristics of the orthodontic tooth movement during surgical-orthodontic treatment in order to provide an effective presurgical orthodontic treatment planning for the maxillary premolar extraction modality In the skeletal Class III malocclusion patient. Pre- and post-treatment dental casts of skeletal Class III malocclusion patients with nonextraction (N=:24) and the maxillary premolar extraction (N=31) were collected. The angulation and inclination measuring gauge(Invisitech Co. Seoul, Korea) was used to evaluate the orthodontic tooth movement. The changes in the maxillary and mandibular dental arch widths were also measured from the canines to the second molars. As a result, more palatal inclination change in the maxillary dentition was found with the premolar extraction modality than with the nonextraction modality. Linear regression analysis showed that the inter-arch width coordination was mainly due to the inclination changes of maxillary posterior teeth We conclude that the indications and proper treatment planning for surgical-orthodontic treatment in skeletal Class III malocclusion with maxillary premolar extraction could depend partly on the magnitude of the transverse inter-arch coordination especially in the maxillary dentition.

• The Journal of the Korean dental association
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• v.32 no.10 s.305
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• pp.688-690
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• 1994

상악전돌증은 교정-수술의 복합치료가 이루어져야 하는 경우가 대부분이며, 수술만으로 해결가능한 경우는 드물다. 술전 교정치료에 의해 수술시 골편의 이동이 없도록 치열을 배열하고, 높낮이를 조절하며, 개개치아의 부정한 위치를 바로 잡아야 된다.

• The korean journal of orthodontics
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• v.29 no.3 s.74
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• pp.327-337
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• 1999

Patients with skeletal class III can be succesfully treated by either orthognathic surgery or orthodontic treatment owing to unavoidable circumstances. Systers were treated , elder syster by orthognathic surgery and younger one by compromised treatment. For the ideal treatment goal, orthognathic surgery will be inevitable in skeletal problem case, but by the patient's private situations orthodontist cannot help doing compromised treatment. It could be another option if correct biomechanical approach is used.

• Journal of Yeungnam Medical Science
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• v.5 no.1
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• pp.127-133
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• 1988

Two patients, sought treatment for chief complaints of protruding frontal tooth and desired treatment to reduce the prominance of lips, were diagnosed as bimaxillary protrusion via clinical and cephalometric analysis. The authors corrected them by combined surgical and orthodonic treatment. As pre-surgical survey, paper and cast surgery were performed and wafer and resin sprint were constructed. We performed anterior maxillary and mandibular osteotomies in first premolar site to retract the maxillary and mandibular dentoalveolar segment in order to ; 1) decrease prominance of upper and lower lips. 2) create proper lower incisor intrusion. By use of intrtamaxillary fixation, prompt oral intake was possible. We made good result of esthetic improvement and there was no evidence of relapse and any complication.

• The Journal of the Korean dental association
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• v.50 no.2
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• pp.72-82
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• 2012

Recently in treatment planning for orthognathic surgery, 3-dimensional analysis using CBCT can give more detailed information that cannot be achieved with 2-dimensional cephalograms. Also, laser Scanning and 3D camera can show 3-dimensional information on soft tissue changes as well as hard tissue changes in orthognathic surgery patients. In other words, soft tissue changes in lateral facial area as well as mid facial area can be quantitatively calculated. To bring out the best results from orthognathic surgery, close interaction between orthodontist and oral surgeon is needed and well treated pre-surgical orthodontics can simplify orthognathic surgical plan that also results in good long-term stability. In surgery-first cases, more thoughtful diagnosis and pre-operative preparation will be needed to prevent complicated problems.