• 대한치과교정학회지
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• 제24권4호
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• pp.773-785
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• 1994

It has been generally believed that the impaction or eruption of mandibular third molars has significant correlations with the growth of the mandible, size of mandibular arch and size of teeth. The purpose of this study was to examine if there is any correlation between the status of eruption of mandibular third molars and the amount of mandibular crowding. The effect of missing of third moalrs to mandibular crowding was studied as well. 140 adult students of Yonsei University were selected and divided into three groups according to the status of mandibular third molars, Group 1) congenital missing group, Group 2) eruption group, and Group 3) impaction group. The tooth size, dimensions of the mandibular dental arch, and the amount of crowding were measured and compared. Results were as follows ; 1. There was no statistically significant difference in tooth size between the missing group and the eruption group(p<0.05). Impaction group showed larger total tooth material, inci- sal tooth material, and individual tooth size except central incisors compared to missing group (p<0.05). Impaction group showed larger total tooth material, incisal tooth material compared to eruption group as well(p<0.05). When individual tooth size was compared, impaction group had larger central incisors, canines, and second premolars than eruption group(p<0.05). 2. Missing group showed larger intermolar width than impaction group and it was stati- stically significant(p<0.05). 3. When compared the amount of total crowding, impaction group showed the largest am- ount of crowding, then eruption group, and missing group showed the least amount of crowding respectively(p<0.05). There was no statistically significant difference between missing stoup and eruption group in the amount of incisal crowding(p<0.05). Impaction group show- ed the largest amount of incisal crowding among all three groups(p<0.05).

• 치과방사선
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• 제21권2호
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• pp.275-285
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• 1991

The clinical and radiographic features of 655 congenitally missing teeth were studied with full mouth periapical radiograms and/or pantomograms from 368 persons visited the Department of Oral Radiology, Infirmary of Dentistry, Kyung Hee University during January 1981 to December 1989. The obtained results were as follows: 1. The prevalence of congenitally missing teeth was revealed to be 8.75% in total examined persons, and there was a higher prevalence in females (9.5%) than in males (8.0%). 2. The most frequently missing teeth were mandibular second premolars (24.6%), followed by mandibular lateral incisors (21.7%), maxillary second premolars (16.2%), and maxillary lateral incisors (11.5%). 3. There was a higher prevalence in the mandible (60.3%) than in the maxilla (39.7%), and no significant differences between right (49.65%) and left (50.35%) side. 4. In number of congenitally missing teeth per person, 54.6% had one missing tooth, and 32.9% had two missing teeth. 5. In persons with one or two congenitally missing teeth, the most frequently missing tooth was mandibular lateral incisor, and the second premolar was the tooth most frequently missing in those persons with more than three congenitally missing teeth.

• 대한치과교정학회지
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• 제51권5호
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• pp.355-362
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• 2021

Objective: This study aimed to establish the prevalence and patterns of nonsyndromic tooth agenesis in patients referred to a tertiary health care facility. Methods: The intraoral records and panoramic radiographs of 9,874 patients aged 12-22 years were evaluated. The study group included 716 patients (371 male, 345 female) with non-syndromic agenesis of at least one tooth (except the third molars). The study data were assessed using descriptive statistics, chi-square test, and Mann-Whitney U test, while patterns were evaluated using a tooth agenesis code (TAC) tool. Results: A total of 1,627 congenitally missing teeth, were found in patients with non-syndromic tooth agenesis, with an average of 2.27 missing teeth per patient. The prevalence of tooth agenesis was 7.25%, and the most commonly missing teeth were the left mandibular second premolars (10.17%). The age group comparison revealed no significant difference in the median number of missing teeth per patient according to the cutoff values for ages between 12 and 22 years. When the missing teeth were examined separately according to quadrants, 114 different tooth agenesis patterns (upper right quadrant = 28, upper left quadrant = 27, lower left quadrant = 31, and lower right quadrant = 28) were identified, and 81 of these patterns appeared only once. Conclusions: This study highlights the benefits of applying the TAC tool in a large sample population. The application of the TAC tool in such studies will enable the development of template treatment plans by determining homogenous patterns of tooth agenesis in certain populations.

• 한국치위생학회지
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• 제11권4호
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• pp.511-522
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• 2011

Objectives : The purpose of this study was to provide some information on the development of oral health care programs geared toward diabetics and ways of promoting their oral health. Methods : The subjects in this study were 586 diabetics who were selected from the 2009 third-year raw data of the 4th(2007~2009) National Health & Nutrition Survey. The data were analyzed with the statistical package SPSS 12.0 to grasp the influence of their sociodemographic characteristics and oral health behaviors on the presence or absence of periodontal diseases and missing tooth. Results : 1. Periodontal diseases were twofold more prevalent among the men than the women(p<0.01). By age, those who were in their 60s had 1.11-fold more periodontal diseases than those who were in their 70s and up(p<0.05). 2. The men and women were similar to each other in the number of missing tooth. By age, the number of missing tooth got smaller in proportion to decrease in age. By income, the number of missing tooth was 1.48-fold larger among the patients who earned an income of one million won or less than those who earned an income of two million won or more(p<0.01). Conclusions : The above-mentioned findings suggest that prospective cohort studies should be implemented to present prediction models of periodontal diseases and diabetes instead of merely sticking to cross-sectional studies. And oral health programs should be developed based on the findings of cohort studies to encourage diabetics to care about their oral health, and in which way they should be helped to promote their oral health should carefully be considered.

• 치위생과학회지
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• 제15권5호
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• pp.612-619
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• 2015

본 연구는 구강건강상태가 전신질환에 미치는 영향을 알아보려는 목적 아래 KNHANES 제6기 1차년도(2013년) 자료를 활용하여 19세 이상 성인을 대상으로 구강건강상태와 류마티스 관절염의 관련성을 파악하였고, 다음과 같은 결과를 도출하였다. 류마티스 관절염과 치주상태 관련성을 교차 분석으로 확인한 결과 통계적으로 유의한 관련성이 나타나지 않았으며, 류마티스 관절염과 치아상실은 통계적으로 유의한 관련성을 보였다(p=0.001). 류마티스 관절염에 미치는 영향을 알아보기 위해 로지스틱 회귀분석을 실시하였다. 치주상태는 류마티스 관절염에 미치는 영향이 없는 것으로 나타났고, 치아상실의 개수가 19~28개인 사람은 0~8개인 사람보다 류마티스 관절염의 위험이 약 3배, 9~18개인 사람은 0~8개인 사람보다 류마티스 관절염의 위험이 약 2배 높은 것으로 나타나 치아상실 개수가 많을수록 류마티스 관절염의 위험성이 높은 것으로 나타났다(p<0.05). 치주상태와 치아상실을 동시에 로지스틱 회귀모델에 적용하여 분석한 결과 같은 결과를 나타냈으며, 통제변수를 보정한 로지스틱 회귀분석결과는 통계적 유의성이 나타나지 않았다. 골밀도 검사를 비롯한 임상검사와 약 복용 등의 염증상태에 대한 진행 정도를 파악하고 보다 체계적인 분석이 이루어져야 할 것이며, 구강건강상태와 류마티스 관절염의 관련성에 관한 양방향성 연구가 활발히 진행되어 두 질환 사이의 명확한 매커니즘이 규명되어야 할 것이다.

• 대한치과교정학회지
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• 제50권6호
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• pp.407-417
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• 2020

Objective: To investigate the dental phenotypes and treatment modalities (Tx-Mod) in Korean patients with Parry-Romberg syndrome (PRS) using longitudinal data. Methods: The samples consisted of 10 PRS patients, who were treated and/or followed-up at Seoul National University Dental Hospital between 1998 and 2019. Using a novel PRS severity index based on the numbers of the atrophy-involved area and asymmetry-involved item, we classified them into mild (n = 3), moderate (n = 2), and severe (n = 5). Dental phenotypes, including congenitally missing tooth (Con-Missing-Tooth), microdontia, tooth with short root (Short-Root), tooth with dilacerated root, and delayed eruption/impacted tooth, were investigated along with Tx-Mod. Results: The side of occurrence of all dental phenotypes showed 100% concordance with the side of PRS involvement. The most two common dental phenotypes were Con-Missing-Tooth and Short-Root (n = 29 and n = 17 in six patients). The sums of the average number of Con-Missing-Tooth and Short-Root increased from mild PRS to moderate PRS and severe PRS cases (1.0, 6.0, and 6.2). In terms of Tx-Mod, growth observation due to mild atrophy, fixed orthodontic treatment, and grafting were used for mild PRS cases. Tx-Mod for moderate PRS cases involved growth observation for surgery due to an early age at the initial visit. For severe PRS cases, diverse Tx-Mod combinations including unilateral functional appliance, fixed orthodontic treatment, growth observation, grafting, and orthognathic surgery were used. Conclusions: The novel PRS severity index may be useful to provide primary data for individualized diagnosis and treatment planning for PRS patients.

• 대한소아치과학회지
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• 제50권2호
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• pp.179-191
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• 2023

이 연구의 목적은 2010년 1월부터 2021년 2월까지 부산대학교 치과병원에 내원한 8 - 16세 환자를 대상으로 영구치의 선천성 치아 결손 유병률 및 결손 유형을 조사하는 것이다. 총 11,759명(여성 5,548명, 남성 6,211명)의 파노라마 방사선 사진과 전자의무기록을 후향적으로 분석하였다. 선천 결손 유병률은 10.74%였다(여성 11.95%, 남성 9.66%, p < 0.0001). 평균 2.22개의 치아가 결손이 되었으며, 하악(8.39%)의 치아가 결손이 된 경우가 상악(4.52%)에 비해 많았다(p < 0.0001). 가장 빈번하게 결손이 되는 치아는 하악 제2소구치(58.19%)였다. 모든 분악에서 1개의 치아가 결손이 된 경우는 제2소구치가(30.10%, 31.67%, 43.14%, 35.59%), 2개 이상의 치아가 결손이 된 경우는 제1, 2소구치가(11.69%, 11.47%, 5.94%, 5.24%) 가장 많았다. 악궁 간 관계와 전악에서 결손 유형의 1 - 4위는 모두 제1, 2소구치가 연관이 되어 있었다. 이 연구 결과는 선천적 치아 결손 환자의 치료 계획 설립에 임상적 보탬이 될 수 있으며 특정 유전자와의 연관성을 밝혀내기 위한 분자생물학적 연구의 기초자료로 활용될 수 있을 것이다.

• 대한치과보철학회지
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• 제8권1호
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• pp.9-14
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• 1968

A total of 11,039 permanent missing teeth and their 2,696 prosthetic replaced teeth in 6,123 Korean patients were selected for this study, Analyzing the data according to age, sex, jaw and the location, following results were obtained. 1. Tooth mortality and replacement were higher in female than in male. 2. Replaced teeth were only 24 percent of missing teeth. 3. More teeth were extracted and replaced on lower jaw in young patients and on upper jaw in old patients. 4. There are no significant difference in right and left sides of both jaws in missing and replaced teeth, respectively. 5. First molar was the highest percentage in both mortality and replacement. 6. Upper tooth mortality and replacement were higher in anterior portion and lower in posterior portion.

• The Journal of Advanced Prosthodontics
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• 제2권3호
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• pp.77-80
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• 2010

This article describes esthetic improvement in a patient with a missing maxillary left central incisor. Space analysis of the anterior dentition showed that minor tooth rearrangement was needed. Optimal space distribution for restorations was attained by orthodontic treatment. Through transforming tooth shape with porcelain laminate veneers, the maxillary left lateral incisor was transformed into central incisor and the maxillary left canine into a lateral incisor. The maxillary right central incisor was also restored for esthetic improvement. In a case of changing a tooth shape with porcelain laminate veneers, pre-treatment evaluation, space analysis and diagnostic wax-up are important factors.

• 대한소아치과학회지
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• 제24권1호
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• pp.179-185
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• 1997

The prevalence of congenital teeth missing is about 2-10% of population and it is more common in permanent dentition than primary dentition. In the patients with congenital missing teeth symptoms such as conical tooth, prolonged retention of primary tooth, tooth attrition. and deficient alveolar bone growth can be accompanied. In this paper the results of clinical observation of the congenital teeth missing brothers and their familial history are presented.