• 대한소아치과학회지
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• 제10권1호
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• pp.85-93
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• 1983

In one group that tested for the effects of grinding and etching on the deciduous teeth, S.E.M. examination on the ground or unground labial surface of deciduous maxillary central incisors were made after etching procedure with 40% phosphoric acid for 60 secs., 120 secs., 180 sees. each. In another group that tested for the degree of resin penetration to the ground and etched deciduous teeth, composite resin application was done to the ground deciduous maxillary central incisors that had been acid-etched for 30 secs., 60 secs., 90 sees., 120 sees., 180 secs. each. The tooth-resin specimens were cut at the middle 1/3 of the crown by 2mm thickness, and the adjacent tooth materials were demineralized by 10% hydrochloric acid, the author observed the tags of the resin replica with S.E.M.. Following results were obtained. 1. After 40% phosphoric acid etching, the unground deciduous enamel surface showed various types of etching pattern. 2. For the formation of regular micropores on deciduous enamel surface by acid etching with 40% phosphoric acid, the time over 120 secs. should be requested. 3. After 40% phosphoric acid etching, the ground deciduous enamel surface showed the same etching pattern that has been a preferential removal of prism peripheries despite different etching time. 4. On the ground group that etched over 60 secs. to 180 secs., the length of tags was $5{\mu}m$ to $8{\mu}m$, with a mean of $7{\mu}m$.

• 대한소아치과학회지
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• 제36권1호
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• pp.84-88
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• 2009

치아매복이란 물리적인 장벽으로 치아맹출에 장애가 발생하는 것으로, 정상 맹출 시기까지 치아가 맹출하지 못하는 상태를 말하며, 영구치열기에서 주로 관찰되고, 유치열기에서는 드물다. 치아매복은 전신적 그리고 국소적인 요인에 의하여 일어나고, 치아종에 의한 매복이 자주 발생하는 것으로 보고되었으며, 치아종에 의한 매복 또한 대부분 영구치열기에 나타나고, 유치열기에서는 드물게 발생한다. 이 증례는 하악 좌측 제2유구치의 맹출지연을 주소로 내원한 4세 4개월 된 여아에서, 임상 및 방사선학적 검사 결과 매복된 하악 좌측 제2유구치와 제1대구치 교합면 상방에서 치아종을 관찰할 수 있었으며, 하악 좌측 제2유구치는 치아종에 의해 하악 제1대구치 방향으로 원심경사 되어 있었다. 이에 저자들은 치아종을 제거한 후 매복된 하악 좌측 제2유구치를 교정적으로 견인하고 맹출을 유도하여, 양호한 교합 관계를 얻었기에 이를 보고하는 바이다.

• 치과방사선
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• 제15권1호
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• pp.67-74
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• 1985

The incidence and associated dental abnormalities of taurodontism were studied radiographically (panoramic view) in 1895 patients of deciduous dentition and 2167 patients of permanent dentition who had visited to the Department of Oral Radiology, Kyung Hee University in Korea. The obtained results were as follows: 1. The prevalence of taurodontism was 3.59% in the deciduous dentition group, and 1.8% in the permanent dentition group. 2. There was no definite sex difference in the deciduous dentition, and the permanent dentition group. The type of mesotaurodontism was predominent in the deciduous dentition group, and hypotaurodontism in the permanent dentition group. 4. The vast majority of this abnormalities had occurred in the mandibular 1st deciduous molar in the deciduous dentition group, and mandibular 2nd permanent molar in the permanent dentition group. 5. Of the cases with taurodontism, the deciduous dentition group revealed 95.6% bilaterally, and 82% bilaterally in the permanent dentition group. 6. Multiple teeth occurance, not single tooth only, were involved in 98.5% of the cases in the deciduous dentition group, and 82% in the permanent dentition group.

• 대한장애인치과학회지
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• 제3권2호
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• pp.87-90
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• 2007

$DIFOTI^{(R)}$ 가시광선 파장을 이용하여 방사선 노출 없이도 실시간으로 교합면, 인접면, 평활면 우식, 재발성 우식 및 치아 파절이나 불소증 등을 효과적으로 진단할 수 있는 영상 장비이다. 시진 및 방사선 사진에 비해 치아 우식 탐지에 있어서 민감도가 매우 높은 것으로 나타나고 있으며, 이를 통해 치아의 탈회를 조기 진단하여 보다 보존적인 치료가 가능하리라 사료된다.

• 대한소아치과학회지
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• 제21권2호
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• pp.463-468
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• 1994

The purpose of this study was evaluation of the oral health of cerebral palsied children by considering the DMFT index. The 31 cerebral palsied children(Male 20, Female 11) participated in the study, and mean age was 11.3 years. All patient were examined for determination of decayed tooth, missing tooth, filled tooth. For children with only deciduous dentition, the dmf system was used; for children with only permanent dentition, the DMF system was used; for children with mixed dentition, a combination of two systems(dmf and DMF) was used. The results were as follows: 1. In the deciduous dentition, dmft index was 11.60.(dt rate ; 83.62%, mt rate ; 12.07%, ft rate ; 4.31 %) 2. In the mixed dentition, DMFT index was 12.25 and dmft index was 10.75.(DT rate ; 90.00 %, MT rate ; 0 %, FT rate ; 10.00 %, dt rate ; 60.53 %, mt rate ; 28.95 %, ft rate ; 10.52 % ) 3. In the permanent dentition, DMFT index was 8.16.(DT rate ; 87.77 %, MT rate ; 11.51 %, FT rate ; 0.72 %)

• 한국치위생학회지
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• 제11권1호
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• pp.127-136
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• 2011

Objectives : The writer aimed to examine the dynamic aspect on damage and to be conducive to the swift cure according to right treatment to educate prevention of injury through surveying on the number of the damaged teeth given injury, tooth kind, type in damage, place and cause for being damaged, frequency by month and by time level, and location of the damaged tooth. Methods : Targeting 343 teeth of receiving injury in 201 patients who visited the department of pediatric dentistry, the department of preservation, and the oral and maxillofacial surgery in a dental hospital in Cheonan city from April 2007 to April 2009, by having the dental injury as the main reason, the following conclusions were obtained. Results : 1. Deciduous teeth were indicated to be the highest in imperfect luxation with 60.7%, and were indicated to be in order of crown fracture with 25.5%, root fracture with 12.4%, and perfect luxation with 1.4%. The permanent teeth were indicated to be the highest in crown with 58.1%, and were indicated to be in order of imperfect luxation with 27.3%, root fracture with 13.1%, and perfect luxation with 1.5%(p<0.001). 2. In case of deciduous teeth for a place with damage, the home was indicated to be the highest with 31.7%. The permanent teeth were indicated to be the highest(p<0.001) in the road and stairs with 40.4%. As to a cause for damage, both deciduous and permanent teeth were indicated to be the highest(p<0.001) in a cause for falling with 53.1% and 30.8%, respectively. 3. As for a treatment method, in case of deciduous teeth, the close observation was indicated to be the highest with 46.9%. In permanent teeth, the resin restoration was indicated to be the highest(p<0.001) with 22.2%. Dental injuries in deciduous teeth and permanent teeth are showing diverse aspects. Conclusions : It is important to arrange guidelines on cure of the damaged teeth by injury through continuing a dynamic research on these aspects. Also, the damage in deciduous teeth may have direct and indirect influence upon growth in successional permanent teeth. Thus, through careful treatment, the injury needs to be minimized. It is considered to be likely necessary for a right coping method when injury occurs, and above all, for enough prior education so that injury cannot occur.

• 대한소아치과학회지
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• 제49권3호
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• pp.310-320
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• 2022

이 연구는 유치 치아형태학 실습을 통해 비대면 수업의 학습 효과를 확인하고자 하였다. 유치 치아형태학이라는 과목명으로 60명의 본과 1학년 학생들은 대면으로 실습수업을 받고 55명의 예과 2학년 학생들은 비대면으로 실습수업을 받았다. 5주간의 실습수업 후 학생들은 실습 과제를 제출했다. 비대면 수업의 학습 효과를 평가하기 위해 1명의 평가자가 실습 과제를 채점했고 Mann-Whitney U 검정 및 chi-square 검정을 사용하여 대면 수업과 비교하였다. 연구 결과 대면 수업에서 실습 점수는 77.43 ± 5.97였고 비대면 수업에서 실습 점수는 76.04 ± 5.83이었다. 유치 치아형태학 실습에서 대면 수업과 비교하여 비대면 수업의 유의미한 차이는 관찰되지 않았다(p > 0.05). 이번 연구로 치아형태학 같은 비교적 실습 도구가 간단한 수업에서 비대면 수업이 대면 수업의 대안으로 사용 가능하다는 결과를 얻었다.

• 대한치과교정학회지
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• 제47권6호
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• pp.365-374
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• 2017

Objective: The objective of this study is to investigate the eruption pattern and root resorption of the bovine anterior dentition in relation to growth-related parameters based on dental maturity. Methods: A cross-sectional study was conducted on 110 bovine anterior mandibles by using standard radiography, cone-beam computed tomography (CBCT), and actual measurements. We determined the relationships between the stages of dental maturity by using a modification of Demirjian's method and various growth-related parameters, such as the activity of the root-resorbing tissue and mobility of the deciduous teeth. The correlation of growth-related parameters with interdental spacing and distal unusual root resorption (DRR) of the deciduous fourth incisor was assessed. The cause of mesial unusual root resorption (MRR) of the deciduous fourth incisor was determined on the basis of the arrangement of the permanent third incisor. Results: An independent t-test and chi-square test indicated significant differences in growth-related parameters associated with dental arch length discrepancy and factors related to the shedding of deciduous teeth between the low and high dental maturity groups. The samples with interdental spacing and DRR showed a larger sum of mesiodistal permanent crown widths and higher dental maturity than did the respective controls. Samples with MRR tended to show a lingually rotated distal tip of the adjacent tooth crown. Conclusions: Dental maturity has relevance to the interdental spaces and unusual root resorption of mixed dentition. The position of the adjacent tooth crown on CBCT may be correlated with the occurrence of unusual root resorption of the incisor.

• The Journal of Advanced Prosthodontics
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• 제8권3호
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• pp.241-250
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• 2016

Oligodontia is defined as a congenital tooth agenesis with the absence of six or more permanent teeth. This clinical report describes a patient with non-syndromic partial oligodontia, with retained deciduous teeth and the absence of 16 permanent teeth. Anterior esthetic problems were caused by interarch tooth size discrepancy, interdental space, aberrant tooth dimensions, and the absence of centric contacts of the anterior teeth. Prosthetic restoration after orthodontic and implant treatment was performed with a multi-disciplinary team approach. Favorable functional and esthetic results were obtained using a definitive prosthesis.

• 대한소아치과학회지
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• 제24권1호
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• pp.173-178
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• 1997

As one of the developmental disturbances in shape of teeth, an accessory root may involve any teeth, but has very rare frequency in the deciduous teeth. Because it is possible to diagnose the accessory root only by use of the radiographs, it is important to detect this root early by carefully examining the radiographs. The accessory root produces several problems such as abnormal exfoliation of deciduous teeth, eruption abnormality of successive permanent teeth, infection due to residual root during tooth extraction, and incomplete pulp treatment, and therefore it is necessary to have a continuous follow check-up to prevent these problems.