• Journal of Oral Medicine and Pain
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• 제23권4호
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• pp.369-377
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• 1998

A patient with TMJ osteoarthritis and anterior open bite was treated with an intermaxillary traction device. Pretreatment examination revelaed a pain in both TMJ during mouth opening, moderate tendernesso f left sternocleidomastoid and right trapezius muscles. Anterior open Bite was aobserved with interincisal distance of 2mm. Tomograms and MRI showed anterior disc displacement withouit reductoin of both temporomandibular joints, and the condyles were flattened and slightly eroded. A pair of full-coverage occlusal appliances was made on both maxillary and mandibular dentition, with pivoting fulcrum on the site of the second moalr. Traction force was gained by the intermaxillary orthodontic elastics which were hooked by orthodontic brackets on the labial surfaces of the upper and lower anterior and premolar teeth. After 8 weeks of traction treatment, the joint pain was subsided completely and the anterior open bite was closed to get an edge to edge relationship of anterior teeth.

• 대한치과교정학회지
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• 제15권2호
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• pp.291-301
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• 1985

Fifty subjects who were to be treated with fixed orhodontic appliances by light wire edgewise technique were selected. Bands with different marginal depth were made in first molar and direct bonding brackets were bonded in second premolar. For determining the effects of fixed orthodontic appliance on the gingival tissue, the changes of clinical crown length, periodontal pocket depth, gingival sulcus fluid were checked. The results were as follows: 1. Gingival condition was deteriorated after wearing the fixed orthodontic appliance, and the deteriorative rate was decreased gradually. 2. The greatest gingival change was occurred in the maxillary first molar among the experimental teeth. 3. The gingival change of maxillary teeth was greater than that of mandibular teeth. $(p\leq0.01)$ 4. The greater gingival change was occurred around subgingivally located band than around supragingivally located band. 5. Comparing the gingival changes of banded teeth with them of bonded teeth, the gingival tissue was more effected by oral hygiene than by type of appliances. 6. In the quantitive changes of gingival crevicular fluid, there was no exact relationship with gingival inflammation.

• Restorative Dentistry and Endodontics
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• 제38권3호
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• pp.160-166
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• 2013

This case report demonstrates an unnecessary endodontic treatment of teeth with florid cemento-osseous dysplasia (FCOD) due to a misdiagnosis as periapical pathosis and emphasizes the importance of correct diagnosis to avoid unnecessary treatment. A 30-year-old woman was referred to our institution for apicoectomies of the mandibular left canine and both the lateral incisors. The periapical lesions associated with these teeth had failed to resolve after root canal treatment over a 3-year period. Radiographic examinations revealed multiple lesions on the right canine, the second premolar, and both first molars as well as the anterior region of the mandible. Based on clinical, radiographic and histological evaluations, the patient condition was diagnosed as FCOD. The patient has been monitored for 2 years. To avoid unnecessary invasive treatment, accurate diagnosis is essential before treatment is carried out in managing FCOD.

• 치과방사선
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• 제21권2호
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• pp.249-259
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• 1991

The purpose of this study was to evaluate the incidence and radiographic features of 677 cases of hypercementosis by means of the analysis of full mouth periapical radiograms in 4,236 persons visited the Department of Oral Radiology, School of Dentistry, Kyung Hee University during January 1984 to December 1989. The obtained results were as follows: 1. The incidence of hypercementosis was revealed to be 8.2% in total examined persons, and there was a higher incidence in females (9.4%) than in males (7.1%). 2. The hypercementosis was most frequently occurred in the 6th decades (29.2%), and the incidence was increased by advancing age until 6th decades. 3. There was a higher incidence in the maxilla (59.5%) than in the mandible (40.5%), and maxillary second premolar (18.5%) was the most frequently involved tooth. The maxillary first premolar (11.7%) was next in order to frequency followed by maxillary canine (10.0%) and mandibular first and second premolars (9.6%). 4. In the etiologic factors, 35.0% were inflammation, 31.2% were elongation, 6.2% were trauma from occlusion, 0.1 % were uneruption, and 27.5% were unknown. 5. In the degree of cementum apposition, 35.3% were Type Ⅰ, 29.5% were Type Ⅱ, and 35.2% were Type Ⅲ. 6. In the status of cementum apposition, 3.2% were mesial side, 8.9% were distal side, and 87.9% were mesial & distal side. 7. In the identification of radiographic density between normal cementum and excessive cementum, 12.7% could be identified, and 87.3% could be unidentified.

• 대한소아치과학회지
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• 제35권2호
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• pp.243-258
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• 2008

본 연구는 성장 중인 부정교합 환자의 진단이나 치료계획의 수립, 치료방법 및 시기, 예후 등을 결정하는데 중요한 판단 지침이 되는 치아 석회화 단계와 경추 및 수완부골 성숙도간의 연관성을 규명하여 개인의 보다 정확하고 효율적인 사춘기 성장 정도를 평가하기 위해 시행하였다. 전신 질환이 없고 교정 치료 경험이 없는 7-16세의 여아 154명, 남아 179명, 총 333명의 파노라마 방사선사진, 측모 두부규격 방사선사진, 수완부 방사선사진을 분석하여 평가하였다. 연구 결과, 파노라마 방사선사진의 치아 석회화 단계를 통하여 사춘기 성장 정도를 평가하는 것은 부정교합 환자의 진단 및 치료계획을 수립하는데 임상적으로 유용한 정보를 제공할 것으로 판단되었다.

• 치과방사선
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• 제18권1호
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• pp.153-163
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• 1988

The purpose of this study is to investigate on the clinical and radiographic patterns of cystogenic ameloblastoma of the jaws. The author studied 64 cases of cystogenic ameloblastoma with regard to age, sex distribution, the site of the lesion and several radiographic features. The results were as follows: 1. The average age was found to be 23.0 years, with a range of 4 to 56 years. The incidence was highest in the second and third decades (72%) and total 64 cases consists of 36 males and 28 females. 2. Fifty-nine cases were found in mandible and 5 cases in maxilla. 3. The specific site distribution was found to be 57.8% ramus, coronoid process and condyle, 34.4% premolar-molar region, and 7.8% were located in mandibular symphysis bilaterally. 4. From the total 64 cases, 28 (44%) were associated with an impacted tooth, especially mandibular second and third molar, 36(52%) failed to show any association with tooth impaction. It was found that the average age for impaction-associated tumors was 19.8 years whereas lesions without impaction occurred at an average age of 25.6 years, which was statistically significant. 5. Fifty-three(82%) cases showed unilocular radiolucencies, eleven (17%) cases showed multilocular radiolucencies. It was found that the average age for unilocular lesions was 22.3 years whereas lesions showing multilocularity occurred at an average age of 26.4 years, which was not statistically significant. 6. Of the 21 patients who had been followed for more than 2 years, only 4 patients treated by enucleation or curettage recurred (19% recurrence).

• 대한치과교정학회지
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• 제18권1호
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• pp.217-225
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• 1988

This study was undertaken to examine relationship between tooth size and arch dimension in dental crowding. Two groups of dental casts were selected on the basis of dental crowding. One group, consisting of 51 pairs of dental casts (24 male and 27 female), exhibited remarkable dental crowding. A second group, consisting of 60 pairs of dental casts (30 male and 30 female), exhibited little or no crowding. Mean and standard deviation of the following parameters were used to compare two groups. individual and collective mesiodistal tooth diameters, buccal and lingual arch widths and arch area. The following results were obtained. 1. The crowed group revealed larger tooth size than noncrowded group. (p < 0.01) 2. The crowded group smaller maxillary dental arch dimension than noncrowded group except lingual arch width at canine region. (p < 0.01) 3. The corwded group revealed smaller mandibular dental arch dimension than noncrowded group except lingal arch width at second premalar region in the male and buccal arch width at canine, premolar region in the female. (p < 0.01) 4. The crowded group revealed smaller arch area than noncrowded group in the female (p < 0.01), but there was no significance in the male.

• 대한치과보철학회지
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• 제46권3호
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• pp.290-297
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• 2008

STATEMENT OF PROBLEM: Implant-supported fixed cantilever prostheses are influenced by various biomechanical factors. The information that shows the effect of implant number and position of cantilever on stress in the supporting bone is limited. PURPOSE: The purpose of this study was to investigate the effect of implant number variation and the effect of 2 different cantilever types on stress distribution in the supporting bone, using 3-dimensional finite element analysis. MATERIAL AND METHODS: A 3-D FE model of a mandibular section of bone with a missing second premolar, first molar, and second molar was developed. $4.1{\times}10$ mm screw-type dental implant was selected. 4.0 mm height solid abutments were fixed over all implant fixtures. Type III gold alloy was selected for implant-supported fixed prostheses. For mesial cantilever test, model 1-1 which has three $4.1{\times}10$ mm implants and fixed prosthesis with no pontic, model 1-2 which has two $4.1{\times}10$ mm implants and fixed prosthesis with a central pontic and model 1-3 which has two $4.1{\times}10$ mm implants and fixed prosthesis with mesial cantilever were simulated. And then, 155N oblique force was applied to the buccal cusp of second premolar. For distal cantilever test, model 2-1 which has three $4.1{\times}10$ mm implants and fixed prosthesis with no pontic, model 2-2 which has two $4.1{\times}10$ mm implants and fixed prosthesis with a central pontic and model 2-3 which has two $4.1{\times}10$ mm implants and fixed prosthesis with distal cantilever were simulated. And then, 206N oblique force was applied to the buccal cusp of second premolar. The implant and superstructure were simulated in finite element software(Pro/Engineer wildfire 2.0). The stress values were observed with the maximum von Mises stresses. RESULTS: Among the models without a cantilever, model 1-1 and 2-1 which had three implants, showed lower stress than model 1-2 and 2-2 which had two implants. Although model 2-1 was applied with 206N, it showed lower stress than model 1-2 which was applied with 155N. In models that implant positions of models were same, the amount of applied occlusal load largely influenced the maximum von Mises stress. Model 1-1, 1-2 and 1-3, which were loaded with 155N, showed less stress than corresponding model 2-1, 2-2 and 2- 3 which were loaded with 206N. For the same number of implants, the existence of a cantilever induced the obvious increase of maximum stress. Model 1-3 and 2-3 which had a cantilever, showed much higher stress than the others which had no cantilever. In all models, the von Mises stresses were concentrated at the cortical bone around the cervical region of the implants. Meanwhile, in model 1-1, 1-2 and 1-3, which were loaded on second premolar position, the first premolar participated in stress distribution. First premolars of model 2-1, 2-2 and 2-3 did not participate in stress distribution. CONCLUSION: 1. The more implants supported, the less stress was induced, regardless of applied occlusal loads. 2. The maximum von Mises stress in the bone of the implant-supported three unit fixed dental prosthesis with a mesial cantilever was 1.38 times that with a central pontic. The maximum von Mises stress in the bone of the implant-supported three-unit fixed dental prosthesis with a distal cantilever was 1.59 times that with a central pontic. 3. A distal cantilever induced larger stress in the bone than a mesial cantilever. 4. A adjacent tooth which contacts implant-supported fixed prosthesis participated in the stress distribution.

• 대한소아치과학회지
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• 제34권4호
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• pp.658-665
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• 2007

부분 무치증은 제 3대구치를 제외한 6개 이상의 선천적 치아 결손으로 정의된다. 제3대구치를 제외한 선천적 치아 결손의 유병율은 $1.6{\sim}9.6%$이며 부분 무치증의 유병율은 $0.08{\sim}1.1%$이다. 가장 많이 이환되는 치아는 하악 제 2소구치이며 그 다음은 상악 측절치, 상악 제2소구치 순으로 호발하며 영구치에 비해 유치에서는 드물고 여성에게 호발하는 경향이 있다. 부분 무치증은 외배엽 이형성증과 같은 특정 증후군과 연관되거나 치판의 생리적인 장애나 파열, 공간적 제한, 치성상피의 기능적인 비정상, 기저 간엽세포의 유도 실패나 유전적 영향 등의 원인에서 유래된다고 알려져 있다. 부분 무치증은 안모의 심미적 문제와 함께 치아의 교합 이상 등 기능적인 장애가 야기될 수 있으므로 임상 검사와 방사선 검사를 통한 조기 진단이 필요하며, 이에 따른 적절한 치료계획이 요구된다. 이에 본 증례에서는 특별한 전신질환이 없는 부분 무치증 환아의 구강내 소견 및치료경과에 대해 보고하고자 한다.

• 대한소아치과학회지
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• 제45권3호
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• pp.386-392
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• 2018

터너 증후군이란 한 개의 X 염색체와 전부 혹은 부분이 결여된 X 염색체를 나타내는 염색체 이상 질환이다. 치근 형태 이상이 터너 증후군 환자에서 정상에서보다 호발한다고 보고되었는데, 치근의 이러한 특징은 근관치료를 까다롭게 만들고, 특수한 처치를 요하기도 한다. 또한 터너 증후군 환자들은 종종 심장 또는 신장의 기형과 같은 전신적인 문제를 동반하기도 하므로, 임상의는 터너 증후군의 특징적인 구내 소견을 인지하고, 사전에 구내 합병증을 예방하기 위해 환자들이 정기적으로 치과 검진을 받을 수 있게 해야 한다. 10세 때에 터너증후군 진단을 받은 12세 여자 환자가 하악 양측 소구치 부위의 불편감을 주소로 내원했다. 특징적으로 하악의 모든소구치에서 우상치와 치외치가 관찰되었다. 하악 양측 제1소구치는 세 개의 치근을, 근단부 병소를 보이는 하악 양측 제2소구치는 두 개의 치근을 가지고 있었다. 근관의 복잡한 해부학적 특징 때문에 치과 현미경을 이용한 적절한 시야를 확보하여 근관치료를 마무리 했다. 2년간의 정기적인 관찰 결과 해당치아와 관련된 임상적 징후나 증상, 치근단 병소는 관찰되지 않았다. 본 증례 보고를 통해 터너 증후군 환자의 구강내 특징과 이의 치과적 관리에 대해 보고하고자 하였다.