• 대한치과의사협회지
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• 제57권11호
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• pp.679-688
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• 2019

A 8-year-old patient presented with a crown-root fracture of the maxillary right central incisor with an oblique subgingival fracture line. A multidisciplinary treatment approach including endodontic treatment, surgical extraction and intraalveolar repositioning was used to gain sufficient crown length of the fractured maxillary incisor. The coronally repositioned maxillary right central incisor was stabilized by a resin wire splint. Apexification using MTA was performed. Resin core and direct resin restoration(Cl IV) on fractured teeth was built up. Clinical and radiographic follow-up of the maxillary right central incisor after 36 months showed no signs of root resorption or pathology and acceptable aesthetics and functions were maintained. Surgical extrusion can be considered as a good treatment modality for young patients.

• The Journal of Advanced Prosthodontics
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• 제2권3호
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• pp.92-96
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• 2010

PURPOSE. The aim of this study was to evaluate the thickness of buccal and palatal alveolar bone and buccal bony curvature below root apex in maxillary anterior teeth of Korean adults using Cone-beam CT images. MATERIALS AND METHODS. The 3D image was reconstructed with dicom file obtained through CBCT from 20 - 39 year old Korean subjects (n = 20). The thickness of buccal and palatal plate, root diameter, the buccal bony curvature angle below root apex and the distance from root apex to the deepest point of buccal bony curvature were measured on maxillary anterior teeth area using OnDemand3D program. RESULTS. Mean thickness of buccal plate 3 mm below CEJ was $0.68{\pm}0.29\;mm$ at central incisor, $0.76{\pm}0.59\;mm$ at lateral incisor, and $1.07{\pm}0.80\;mm$ at canine. Mean thickness of palatal plate 3 mm below CEJ was $1.53{\pm}0.55\;mm$ of central incisor, $1.18{\pm}0.66\;mm$ of lateral incisor, $1.42{\pm}0.77\;mm$ of canine. Bucco-lingual diameter 3 mm below CEJ was $5.13{\pm}0.37\;mm$ of central incisor, $4.58{\pm}0.46\;mm$ of lateral incisor, and $5.93{\pm}0.47\;mm$ of canine. Buccal bony curvature angle below root apex was $134.7{\pm}17.5^{\circ}$ at central incisor, $151.0{\pm}13.9^{\circ}$ at lateral incisor, $153.0{\pm}9.5^{\circ}$ at canine. Distance between root apex and the deepest point of buccal bony curvature of central incisor was $3.67{\pm}1.28\;mm$ at central incisor, $3.90{\pm}1.51\;mm$ at lateral incisor, and $5.13{\pm}1.70\;mm$ at canine. CONCLUSION. Within the limitation of this study in Korean adults, the thickness of maxillary anterior buccal plate was very thin within 1mm and the thickness of palatal plate was thick, relatively. The buccal bony curvature below root apex of maxillary central incisor was higher than that of lateral incisor and canine and it seems that the buccal bony plate below root apex of central incisor is most curved.

• 대한소아치과학회지
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• 제45권3호
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• pp.334-343
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• 2018

이번 연구에서는 상악 중절치의 편측성 맹출 장애의 원인을 조사하고 매복된 치아들의 매복깊이, 매복각도, 치근발육 상태를 치과용 Cone-beam CT로 분석하여 치료방향을 예측하는데 도움이 되고자 하였다. 총 134명의 환자 중 상악 중절치의 편측성 맹출 장애로 진단된 평균연령은 7.9세였으며, 남자가 여자보다 2.1배 더 높은 빈도를 나타냈다. 맹출 장애의 주원인은 물리적 장애물로 과잉치와 치아종이 대부분을 차지하였다. 편측성 맹출 장애를 보였던 치아 중 물리적 장애물을 제거한 후, 78증례는 자발적으로 맹출하였으며 56증례는 비자발적으로 맹출하였다. 또한 편측성 매복 상악 중절치의 자발적 혹은 비자발적 맹출은 매복깊이, 매복각도, 치근발육 정도와 연관성이 있었다. 정상적으로 맹출한 치아의 매복 각도는 $50^{\circ}-90^{\circ}$ 사이였으며, 매복 상악 중절치의 자발적 맹출 빈도도 이 범위에서 가장 높았다. 또한 자발적 맹출에 걸린 시간은 매복각도와 치근 발육보다 매복깊이와 높은 상관관계를 보였다. 비자발적 맹출을 보였던 치아들 중 대부분은 교정적 견인에 의해 구강내로 맹출 되었고, 그 기간은 약 12개월 정도 걸렸으며, 교정적 견인기간은 매복깊이, 매복각도, 치근발육 정도와 통계적인 유의성을 나타내지 않았다. 이번 연구의 결과들은 편측성 상악 중절치 맹출 장애의 원인과 치료에 대한 정보를 제공할 수 있었으며, 치료 결과를 제공함으로써 향후 치료계획을 세우는데 도움이 될 수 있으리라 생각된다.

• 대한심미치과학회지
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• 제13권1호
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• pp.19-24
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• 2004

This study is intended to provide a referable information of exposed amount of maxillary central incisor of Korean by ages and gender under rest position. The result of this study will give guidelines for making prothesis. The subjects of this study are patients of Charmgoun Dental Hospital in Busan, Korea. A statistical analysis was conducted after taking digital photos of patients' teeth with a ruler and measuring the length of teeth on the computer program. The results of this study were as follows : 1. The length of maxillary central incisor that exposed under upper lip is decreased by increasing age in rest position.; the average length is 3.455mm in 20s, 2.525mm in 30s, and 1.543mm in 40s. 2. The exposal length in females is more than males, average length is 2.796mm in female and 2.342mm in male. However, there is not significant difference between the genders. 3. The exposed average length of maxiallry central incisor under upper lip is 2.618mm at rest. 4. The clinical crown average length of maxillary central incisor is 10.195mm, but incresing age, there is no significant defference. 5. There is significant difference between the genders in the clinical crown length of maxillary central incisor.; the length is 10.637mm in men, 9.90mm in women.

• 대한치과교정학회지
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• 제44권2호
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• pp.54-61
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• 2014

Objective: This study aimed to propose clinical guidelines for placing miniscrew implants using the results obtained from 3-dimensional analysis of maxillary anterior interdental alveolar bone by cone-beam computed tomography (CBCT). Methods: By using CBCT data from 52 adult patients (17 men and 35 women; mean age, 27.9 years), alveolar bone were measured in 3 regions: between the maxillary central incisors (U1-U1), between the maxillary central incisor and maxillary lateral incisor (U1-U2), and between the maxillary lateral incisor and the canine (U2-U3). Cortical bone thickness, labio-palatal thickness, and interdental root distance were measured at 4 mm, 6 mm, and 8 mm apical to the interdental cementoenamel junction (ICEJ). Results: The cortical bone thickness significantly increased from the U1-U1 region to the U2-U3 region (p < 0.05). The labio-palatal thickness was significantly less in the U1-U1 region (p < 0.05), and the interdental root distance was significantly less in the U1-U2 region (p < 0.05). Conclusions: The results of this study suggest that the interdental root regions U2-U3 and U1-U1 are the best sites for placing miniscrew implants into maxillary anterior alveolar bone.

• 대한치과보철학회지
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• 제16권1호
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• pp.32-37
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• 1978

The purpose of this study was to apply the position, the form and the angle of the attrition in the natural maxillary central incisors shown on the labial surface to the artificial teeth in the field of prosthetic dentistry. So we should exactly alter the molds of artificial teeth in individual cases in order to make artificial teeth more natural. 226 extracted teeth of the maxillary central incisors were chosen as materials. I have exactly examined the teeth with a magnifying glass and a circular graduator under concentrated light. The observation brought me the following results: 1) The attrition was most prevailing at the range from the mesial angle to the middle part of cutting edge in the left maxillary central incisor, and distal angle of cutting edge in the right maxillary central incisor. 2) On the attrite form of both angles, the angulated form was more than 4 times as frequent as rounded form in the mesial angle, and almost equal in the distal angle. 3) On the attrite form of cutting edge, mesial attrite form including mesial angle was most frequent in the left maxillary central incisor, and distal attrite form including distal angle in the right maxillary central incisor. 4) The angle made by the labial surface and the attrite surface was about $39^{\circ}$, and more than 70% of the total examined teeth were included at the range from $31^{\circ}\;to\;50^{\circ}$. 5) None attrite form at the cutting edge was about 12% and completely attrite form at the cutting edge was about 27% of examined teeth.

• 대한치과교정학회지
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• 제37권2호
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• pp.159-163
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• 2007

심한 치근 만곡을 동반한 매복은 흔하지 않으며, 특히 상악 전치의 경우에 그러하다. 이는 외과적 노출과 교정적 견인이 임상적으로 매우 어려우며, 치근유착, 치근의 외흡수, 교정적 견인 후 치근 노출 등의 위험이 있을 수 있기 때문이다. 비록 성공적으로 치료된 증례라 하더라도 치은의 심미를 향상시키기 위하여 치주수술이 필요한 경우가 많다. 본 증례보고는 발육중인 만곡된 치근을 가진 역위 매복된 상악 중절치의 closed eruption technique를 이용한 교정 치험예를 소개하였다.

• 대한치과교정학회지
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• 제50권3호
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• pp.216-226
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• 2020

Root resorption can be caused by several factors, including contact with the cortical bone. Here we report a case involving a 21-year-old female with Angle Class II, division 1 malocclusion who exhibited significant root resorption in the maxillary right central incisor after orthodontic treatment. The patient presented with significant left-sided deviation of the maxillary incisors due to lingual dislocation of the left lateral incisor and a Class II molar relationship. Cephalometric analysis demonstrated a Class I skeletal relationship (A point-nasion-B point, 2.5°) and proclined maxillary anterior teeth (upper incisor to sella-nasion plane angle, 113.4°). The primary treatment objectives were the achievement of stable occlusion with midline agreement between the maxillary and mandibular dentitions and appropriate maxillary anterior tooth axes and molar relationship. A panoramic radiograph obtained after active treatment showed significant root resorption in the maxillary right central incisor; therefore, we performed cone-beam computed tomography, which confirmed root resorption along the cortical bone around the incisive canal. The findings from this case, where different degrees of root resorption were observed despite comparable degrees of orthodontic movement in the bilateral maxillary central incisors, suggest that the incisive canal could be an inducing factor for root resorption. However, further investigation is necessary to confirm this assumption.

• 대한치과의사협회지
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• 제18권8호통권137호
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• pp.639-644
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• 1980

In cases with maxillary lateral incisor missing, the problems were usually treated by the choice between space opening for prosthetic lateral incisor replacement and space closure with cuspid sub stitution for the alteral insicors. The decision of the choice could be perplexing in evaluation of the individual case. Therefore, various diagnostic criteria, such as occlusion, dental esthetics, canine position and inclination, tooth size relationship, maxillary lip length, and skeletal relation had to be evaluated. On the basis of this diagnostic information, the treatment planning could be established. A case was shown to illustrate the treatment of patient with congenitally maxillary lateral incisor missing.

• 대한소아치과학회지
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• 제32권3호
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• pp.550-556
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• 2005

매복치아란 어떤 원인에 의하여 구강점막이나 악골내에서 치아의 맹출이 중지된 상태를 말하며, 악궁내의 어떠한 치아도 매복될 수 있으나 가장 흔하게 이환되는 치아는 상, 하악 제 3대구치, 상악 견치, 상, 하악 제 2소구치, 상악 중절치의 순으로 나타난다. 이 중 상악 영구 전치의 매복률은 0.1-0.5% 정도이며 매복 원인으로는 여러 가지가 있으나 유전치의 외상, 과잉치, 치근단 병소로 인한 매복이 흔하며 조기에 적절히 치료되지 못하면 정중선의 변위, 인접치에 의한 맹출공간 감소, 치조골 높이의 차이 등의 결과를 유발한다. 치료로는 주기적 관찰방법, 매복치의 맹출로가 정상이며 치근이 미완성일 경우 상부 연조직과 경조직을 단순히 제거하여 맹출을 유도하거나 외과적 노출 후 매복치를 교정하는 방법, 치아이식술, 발치 등을 시행할 수 있다. 본 증례들은 상악 중절치의 맹출 지연을 주소로 본원에 내원한 환아들로 상악 중절치의 변위 매복을 외과적 노출과 교정적 견인을 시행하여 양호한 결과를 얻어 보고하는 바이다.