• 구강회복응용과학지
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• 제38권1호
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• pp.60-68
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• 2022

심한 치주염을 가진 환자는 잔존 치조골의 흡수가 증가함에 따라, 병적인 치아 이동이 증가하고 구치부 교합지지 상실의 가능성이 높다. 특히, 상악 전치부에서 병적인 치아 이동이 발생하는 경우, 환자는 심미적인 위축감과 삶의 질 저하를 경험할 수 있다. 중증 치주염 환자에게 교정치료는 새로운 뼈 형성을 촉진하고 치주낭을 감소시키며, 임상적 부착을 얻어 보철 수복에 유리한 결과를 가져옴으로써 이상적인 교합과 기능 회복을 가능하게 한다. 구치부의 교합지지 상실로 인해 전치부 병적 치아 이동이 있는 환자에게 치주치료, 교정치료, 임플란트 치료를 계획함으로써 이상적인 수복공간 확보와 안정적인 교합접촉을 형성하였고, 구치부 교합회복을 통한 기능적인 전악수복을 통해 심미적인 결과를 얻었다.

• 대한치과보철학회지
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• 제33권3호
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• pp.413-439
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• 1995

The purpose of this study was to evaluate the stress distribution developed in the supporting structures by mandibular distal extension removable partial dentures with 2 different direct retainer designs and with or without indirect retainer and abutment splinting. The examined direct retainers on the second bicuspid abutment tooth were Akers clasp and RPA clasp, the indirect retainer was located on the mesial fossa of the first bicuspid, and the first and second bicuspid were splinted in case of tooth splinting. Total 8 cases were compared and analyzed with 3-dimensional finite element method. 150N were applied vertically on the artificial teeth of the removable partial denture, and then stress distribution patterns were analyzed and compared. The results were as follows : 1. The forces transmitted to the abutment tooth were primarily from the occlusal rests. 2. The abutment tooth was displaced distally when the force was applied. The compressive stress was observed at the distal root surface of the abutment tooth and the tensile stress, at the mesial root surface. 3. The denture base was displaced posteriorly and inferiorly when the force was applied. At the more distal portion of the denture base, the greater displacement was observed.And the anterior portion of the major connector was displaced superiorly. 4. The occlusal rest placed on the distal part of the abutment tooth tended to tip the tooth more posteriorly than did one on the mesial part of that tooth. 5. Severe superior displacement was observed at the anterior portion of the major connector in case of removable partial dentures without indirect retainer. 6. In case of tooth-splinting, the stress was distributed through all the root surface of both abuments. In case of no tooth-splinting, the stress was concentrated on the distal root surface of the primary abutment.

• Journal of Periodontal and Implant Science
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• 제25권2호
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• pp.290-300
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• 1995

Tooth mobility is one of the most important clinical parameters in examination, diagnosis, prognosis and treatment planning procedure. In order to determine the differences of tooth mobility according to radiographical bone level, clinical root length, clinical crown/root ratio, and bleeding on probing, 90 male adults with periodontal disease and 10 male adults with periodontal health($25{\sim}45$ years old) were selected through clinical examinations including occlusal relationship, probing depth, attachment level, and bleeding on probing. On the mandibular anterior teeth, standard periapical radiographs were taken, and tooth mobility was measured by Periotest(Siemens Co., Germany). The radiographic bone level of individual tooth was evaluated as coronal 1/3, middle 1/3, and apical 1/3 to anatomical root length, and clinical crown length from incisal edge to bone level and clinical root length from bone level to root apex were measured with Boley gauge, and subsquently clinical crown/root ratio was calculated. The difference of tooth mobility(Periotest value) according to radiographical bone level, clinical root length, clinical crown/root ratio, and bleeding on probing was statistically analyzed by unpaired Student t-test. Tooth mobility was significantly higher in bleeding group than non-bleeding group on probing in the teeth radiographic bone level of middle 1/3, with clinical root length longer than 6mm, and with clinical crown/root ratio over 0.3(p<0.01). But there was no statistical difference in tooth mobility between bleeding group and non-bleeding group on probing in the teeth with radiographic bone level of apical 1/3, with short clinical root length less than 5mm, and with clinical crown/root ratio under 0.2(p>0.05). The results note that the tooth mobility depends on clinical root length, clinical crown/root ratio and gingival inflammation, and in the teeth with relatively good alveolar bone support gingival inflammation is one of the most important factors that affect tooth mobility.

• 대한소아치과학회지
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• 제37권2호
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• pp.151-158
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• 2010

연구목적은 모유 또는 분유 섭취 시 나타나는 유치열의 치면별 우식패턴에 차이가 없으며 수유기간에 따른 차이도 없다는 가설을 검증하는 것이었다. 익산시, 청주시, 울산광역시의 36-71개월 어린이 815명을 대상으로 구강검사로 치면별 우식경험도를 조사하고, 보호자들을 대상으로 설문지 조사법으로 모유와 분유 중에서 생후 1년간 주로 수유한 것과 수유 기간을 조사하였다. 모유군과 분유군 간 우식경험유치면수(dmf)의 차이는 유의하지 않았다. 모유군에서 분유군보다 우식경험도가 더 높았던 유치군은 상악 유전치이었고, 유치면군은 상악 유전치 협설면과 인접면이었으며, 유치는 상악 유절치와 상하악 제2유구치이었고, 유치면은 상악 유중절치의 협면과 원심면, 상악 유측절치의 협설면, 인접면, 상악 제2유구치의 설면, 인접면, 교합면, 하악 제2유구치의 협면, 원심면이었다. 모유군에서 수유기간이 증가함에 따라 우식경험유치면수가 증가한 유치군은 상악 유전치와 상악 유구치이었고, 유치면군은 상악 유전치의 인접면, 상악 유구치의 협설면, 인접면, 교합면, 하악 유구치의 인접면이었으며, 유치는 상악 유전치, 상악 유구치, 하악 제2유구치이었고, 유치면에서는 상악 유전치의 인접면, 상악 제1유구치의 협설면, 인접면, 교합면, 상악 제2유구치의 협면, 하악 제2유구치의 근심면이었다. 분유군에서는 수유기간 3년 이상에서 우식경험유치면수가 증가하였으나 차이가 유의하지 않았다. 수유와 관련되어 발생하는 상악 유절치의 중증 유아기 우식증은 분유를 수유하는 경우보다 모유를 수유하는 경우에 더 많이 발생하였다. 모유 수유를 2년 이상 하는 경우에는 상악 유절치의 우식 예방을 위한 조치가 필요하다.

• 치과방사선
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• 제24권1호
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• pp.129-135
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• 1994

This study was performed to evaluate the accuracy of orthopantomogram by measuring the actual and radiographic tooth length and by analyzing the vertical magnification rate. For this study, total 90 teeth of the maxilla and mandible teeth and a dry skull were used. This experiment was attached with metal balls of 1±0.02㎜ at the root and the crown cusp tips of central, 2nd premolar, 1st molar of the maxilla and mandible and the teeth were embedded in dry skull, and then orthopantomogram was taken. The obtained results were as follows: 1. The average of tooth length in orthopantomogram was longer than that of actual tooth length. 2. The average of vertical magnification rate in the orthopantomogram to actual tooth length was 17-26%. 3. Vertical magnification rate of the maxilla teeth was 18-26% and that of mandibular teeth was 17-23%, and the magnification of maxillary teeth was larger than that of mandible teeth(P<0.0l). 4. Vertical magnification rate of posterior area was 22-26% and that of anterior area was 17-18%, and the magnification of anterior area was less than that of posterior area(P<0.01).

• The Journal of Advanced Prosthodontics
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• 제8권6호
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• pp.511-514
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• 2016

For patients with systemic diseases who face difficulties visiting dental clinics, wearing fixed partial denture in the anterior region on the same day of tooth extraction can reduce the total period of treatment and the number of visits, as well as post-treatment psychological effect on the patient.

• Imaging Science in Dentistry
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• 제47권4호
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• pp.241-246
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• 2017

Purpose: The aim of this study was to compare the root surface areas of the maxillary permanent teeth in Thai patients exhibiting anterior normal overbite and in those exhibiting anterior open bite, using cone-beam computed tomography (CBCT). Materials and Methods: CBCT images of maxillary permanent teeth from 15 patients with anterior normal overbite and 18 patients with anterior open bite were selected. Three-dimensional tooth models were constructed using Mimics Research version 17.0. The cementoenamel junction was marked manually. The root surface area was calculated automatically by 3-Matic Research version 9.0. The root surface areas of each tooth type from both types of bite were compared using the independent t-test (P<.05). The intraclass correlation coefficient was used to assess intraobserver reliability. Results: The mean root surface areas of the maxillary central and lateral incisors in individuals with anterior open bite were significantly less than those in those with normal bite. The mean root surface area of the maxillary second premolar in individuals with anterior open bite was significantly greater than in those with normal bite. Conclusion: Anterior open-bite malocclusion might affect the root surface area, so orthodontic force magnitudes should be carefully determined.

• 대한장애인치과학회지
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• 제10권2호
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• pp.84-88
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• 2014

1. 순측접근법은 치수치료를 순측으로 시행한 후 변색된 순측의 치질을 확대하여 삭제하고 레진으로 순면전체를 수복함으로써 치수치료와 동시에 심미성을 회복할 수 있다. 2. 순측으로 치수치료를 시행하므로 시야가 확보에 유리하고 기구조작이 용이해 행동조절이 잘 되지 않는 어린이에게 추천된다.

• 대한소아치과학회지
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• 제26권1호
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• pp.119-125
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• 1999

Air turbine handpiece를 사용하여 치간 법랑질을 삭제하는 Air-rotor stripping 술식은 악궁확장이나 발치 술식에 대한 대체방안으로써 arch length discrepancy를 해결할 수 있는 효과적인 접근법으로 사료된다.

• 구강회복응용과학지
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• 제38권1호
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• pp.26-33
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• 2022

전치부 치간 사이 공간은 치주 환자에게 흔히 발생되는 병적 치아 이동(PTM, pathological tooth migration)과 함께 자주 관찰된다. PTM에는 다양한 교합적 요인들이 기여하는데 특히 상악 전치부에서는 과도한 교합력이 있을 때 위치 문제로 인한 불리함 때문에 치간 이개가 쉽게 발생한다. 치주 지지 조직이 소실된 치아는 의도적인 연결 고정(splinting)을 통해 지지 면적을 확장하면 안정성이 증가될 수 있다. 또한 고정성 보철물로 수복 시에는 불리한 교합을 유리한 형태로 바꿀 수 있다. 임시보철물을 통해 안정적 교합을 확보 후 이것을 최종보철물로 옮기는 일은 CAD-CAM을 통하여 가능하다. 본 증례에서는 치간 접촉이 상실된 상악 전치부에서 정확한 진단과 치료를 통해 장기적으로 안정적인 결과를 보여 소개하고자 한다.