• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제36권5호
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• pp.386-391
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• 2010

Introduction: Bone resorption is a unique function of osteoclasts. Osteoclasts are a specialized macrophage polykaryon whose differentiation is regulated principally by macrophage colony-stimulating factors, receptor activator of nuclear factor ${\kappa}B$ ligand (RANK) ligand, osteoprotegerin (OPG), and interleukins (IL). Reflecting the integrin-mediated signals, osteoclasts develop a specialized cytoskeleton that allows it to establish an isolated micro-environment between itself and the bone, wherein matrix degradation occurs by a process involving proton transport. The levels of IL-1, IL-6, OPG, and prostaglandin $E_2$ ($PGE_2$) expression were evaluated to study the correlations between dental implant teeth and the adjacent teeth. Materials and Methods: The exudate of the gingival crevice acquired from dental implants, adjacent teeth, opposite teeth and contralateral teeth of 24 patients. Results: 1. The levels of IL-1, IL-6, OPG and $PGE_2$ expression in dental implant teeth were higher than those of the contralateral teeth. 2. IL-1 revealed a higher expression level in the adjacent teeth than in dental implant teeth. 3. The dental implant teeth and adjacent teeth did not show a remarkable difference in the level of IL-1 expression. 4. All the other cytokines were strongly expressed in the dental implant compared to the adjacent teeth. Conclusion: These results suggest that there might be close correlation between dental implant teeth and adjacent teeth in terms of the expressions of cytokines that affect the development and regulation of osteoclasts.

• 대한소아치과학회지
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• 제32권1호
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• pp.49-54
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• 2005

Shell teeth는 매우 드문 상아질 이상으로 상아질 이형성증의 한 형태로서 특징적으로 정상적인 법랑질, 매우 얇은 상아질, 비정상적으로 큰 치수강, 짧아진 치근 등을 보인다. Shell teeth는 1954년 Rushton이 21세 남자 환자에서 나타난 증상을 설명하여 처음 명명하였으며, 1984년 Kinirons이 8세 남아의 shell teeth에 대해 보고하였다. 1992년 Harrison과 Kennedy는 7세 6개월 된 남아에서 보인 shell teeth를 14년간 관찰하여 보고하였는데 이 환아는 유치열과 영구치열 모두 shell teeth가 관찰되었고, 일반적인 shell teeth와 달리 치관에서는 shell teeth의 특징이 나타나지 않았으며, 치근에서만 나타났다. 매우 얇은 상아질과 큰 치수강은 국소적 이형성증에도 관찰되는 특징인데, shell teeth는 전치열에서 보이는데 반해 국소적 이형성증은 한정된 몇 개의 치아에서만 관찰되어 감별진단 할 수 있다. 본 증례는 3세 남아에 관한 것으로 구강내 소견은 모든 유치 치관이 파괴되어 상아질이 노출되어 있었고, 방사선 소견은 얇은 상아질로 둘러싸인 매우 큰 치수강과 확장된 치근관을 보였으며 다수의 소구치가 결손되어 있었다. 환아는 행동조절의 문제 때문에 전신마취하에 치료를 받았다. 현재 환아는 공간유지장치를 장착하고 있으며, 정기적인 관찰이 필요하리라 사료된다.

• 대한소아치과학회지
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• 제50권1호
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• pp.24-34
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• 2023

이 연구의 목적은 유치 치수치료가 치아의 상실에 미친 영향과 관련 요인에 대해 후향적으로 분석하는 것이다. 연구에는 단국대학교 부속 치과병원 소아치과에 내원하여 유치 치수치료를 받은 6개월 - 12세의 환자 97명의 167개 치아가 포함되었고, 치수치료와 치아상실에 관련된 정보가 수집되었다. 연구에 포함된 환자는 남자 56명(57.7%), 여자 41명(42.3%), 치아는 유전치 72개(43.1%), 유구치 95개(56.9%)였다. 평균 관찰기간은 106.1 ± 38.7개월이고, 치료 시 연령은 평균 유전치 34.8 ± 15.4개월, 유구치 69.1 ± 25.1개월이었다. 한 악궁에서 한쪽 치아만 치수치료를 시행한 환자의 좌우측 동명치 탈락 또는 발치 시기를 비교하였을 때 치수절제술된 치아가 유의하게 빨리 상실되었다(p < 0.05). 또, 치료 전에 치근단 염증을 보이는 경우, 치수치료 후에도 염증으로 인해 발치할 확률이 유전치에서 증가했고(p < 0.05, Odds Ratio = 11.04), 유구치에서는 그렇지 않았다(p > 0.05). 치수절제술이 시행된 유치는 유전치에서 평균 7.8개월, 유구치에서 평균 8.5개월 조기 탈락하였다. 유치의 조기 탈락은 공간상실과 계승 영구치의 조기 맹출로 이어질 수 있고, 이는 유치의 치수치료 및 치료계획 수립 시 판단기준으로 활용될 수 있을 것으로 보인다.

• 대한소아치과학회지
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• 제37권1호
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• pp.91-96
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• 2010

많은 연구에서, 유치와 그 계승 영구치의 선천적 결손 간에는 상당한 연관관계가 있는 것을 보고하였다. 그러나 하악 전치부에서, 유치의 선천적 결손에도 불구하고, 그 계승 영구치는 정상적으로 존재하는 증례가 임상적으로 종종 관찰되기도 한다. 본 연구의 목적은 한국 어린이에서 하악 유절치와 그 계승 영구치의 선천적 결손 간의 상호 연관관계를 평가하는 데에 있다. 2005년 1월 1일부터 2008년 9월 5일까지 서울대학교치과병원에 내원하여 파노라마 방사선사진을 촬영한 6세 이하의 남녀 어린이 총 14,307명을 대상으로 하악 전치부의 치아양상을 관찰하여 유치와 영구치의 선천적 결손 관계를 평가하여 다음과 같은 결과를 얻었다. 1. 하악 유절치의 결손률은 0.24%였으며, 하악 유절치가 존재 시 후속 영구치가 존재할 승산(odds)은 7163.5였으며, 유절치의 결손시 후속 영구절치가 존재할 승산(odds) 0.79였다. 2. 하악 유절치 결손의 증례 중 후속 영구치가 모두 존재하는 경우는 44.12%였다. 유절치의 양측 결손 시 후속 영구치가 하나라도 존재할 승산(odds)은 유절치 편측 결손 시에 비하여 1.57 배였다. 3. 유절치 결손이 있을 때 유절치의 편측 결손일 승산(odds)은 여자가 남자에 비해 2.2 배였다. 또한, 유절치 결손이 있을 때 후속 영구절치가 존재할 승산(odds)은 남자가 여자의 경우에 비하여 2.22 배였다.

• 한국치위생학회지
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• 제14권3호
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• pp.319-326
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• 2014

Objectives : The purpose of the study is to investigate the factors affecting the bone density and the relationship between bone density and remaining teeth by using data from 2007 to 2009 of the 4th Korean National Health and Nutrition Examination Survey(KNHANES). Methods : The subjects were 1,829 postmenopausal women over 50 years old from the data of the 4th KNHANES. Results : The bone density had the significant difference in 'age' and 'level of education' and remaining teeth had the significant difference in age, monthly income and level of education. The bone mineral density and remaining teeth had the significantly different from subjective general health, smoking, drinking, physical activity. The oral health behaviors and remaining teeth had the significantly associated in subjective oral health status, frequency of tooth brushing, use of auxiliary oral hygiene product, and recent oral examination. Conclusions : The number of remaining teeth is below 9.27 compared with the normal group.

• 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.

• Restorative Dentistry and Endodontics
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• 제16권2호
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• pp.182-188
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• 1991

The purpose of this study was to clarify the effect of intracana1 medication on the clinical symptoms and the number of visits before canal filling in endodontic treatment The experimental teeth was divided into three groups. The teeth of group 1 was irrigated with saline solution and the teeth of group 2 was irrigated with sodium hypochlorite during biomechanical preparation. The intracanal medicament was not applied in the canals of group 1 and group 2. The teeth of group 3 was irrigated with sodium hypochlorite and hydrogen peroxide during canal enlargement and applied formocresol as intracanal medicament after drying the root canals with paper points. The incidence of interappintment pain and percussion pain after 1 st visit and the number of appointments before canal filling was examined, and the results was statistically compared. The following results were obtained. 1. The incidence of interappointment pain and percussion pain and the number of visits before canal filling was not effected by the types of irrigant and the use of the intracanal medicament 2. There was no significant difference in the incidence of interappintment pain arid percussion pain and the number of appointement before canal filling between vital teeth and non vital teeth, and also between single rooted teeth and multirooted teeth. 3. The use of formocresol as intracanal medicament was not able to aid the elimination of clinical symptoms and to decrease the number of appointment before canal filling.

• 소성∙가공
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• 제23권1호
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• pp.16-22
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• 2014

The current study presents a simple setup method for making teeth models using a three-axis CNC milling machine. Physical teeth models can be made by several methods: casting, machining, and three-dimensional printing. Since the shape of a teeth model requires five-axis machining, the machining of a teeth model using a three-axis CNC milling machine requires careful setup operations. In this paper a simple datum shape is designed within the work piece of the teeth model. The datum shape is an n-sided prism with regular n-polygon ends and rectangular sides. In the present study a 12-sided prism is used, which easily makes 30 degree rotations for finish machining. The proposed setup approach does not require any special tools for making the teeth model using a three-axis CNC milling machine. A test was run and the results show that the proposed approach is useful for experimental makings with the limited facilities available.

• The Journal of Advanced Prosthodontics
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• 제5권4호
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• pp.423-427
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• 2013

PURPOSE. This study evaluated the bond strength between porcelain denture teeth (Bioblend 43D) and four different polymerized denture resins (Lucitone 199, Palapress, Acron MC, Triad) with and without a bonding agent and after four different types of surface treatment (polished, HF etched, sandblasted, air-abraded). MATERIALS AND METHODS. Central incisor porcelain denture teeth were divided into 32 groups of 5 each. Tensile bond strength (MPa) was determined using a testing machine at crosshead speed of 0.5 mm/min. Mean and standard deviation are listed. Data were analyzed by two-way ANOVA. Means were compared by Tukey-Kramer intervals at 0.05 significance level. RESULTS. All surface treatment increased bond strength compared to polished surface and the highest bond strength was found with Palapress resin with etched porcelain surface (8.1 MPa). Bonding agent improved the bond strength of all denture resins to porcelain teeth. Superior bonding was found with Palapress and air-abraded porcelain (39 MPa). CONCLUSION. Resins with different curing methods affect the bond strength of porcelain teeth to denture bases. Superior bonding was found with auto-polymerized resin (Palapress). Application of ceramic primer and bonding agent to porcelain teeth with and without surface treatment will improve the bond strength of all denture resins to porcelain teeth.

• Journal of Oral Medicine and Pain
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• 제20권1호
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• pp.217-228
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• 1995

For the purpose of estimating the sex and age in the remains of Catholic martyrs, the authors investigated size, shape and attrition of teeth, morphology of pulp cavity, and the changes of jaws. The 22 teeth, upper and lower jaws, the 23 teeth, upper and lower jaws, the 6 teeth and the 1 tooth were referred from The Pusan Research Institute for Church History in Pusan Catholic Parish. The results were as follows : 1. The 22 teeth, upper and lower jaws presumed to be Lee, Kwan Bok were evaluated to be in the latter half of female thirties. 2. The 23 teeth, upper and lower jaws presumed to be Kim, So ja, Maria were evaluated to be in the middle of male thirties. 3. The 6 teeth presumed to be lee, Jung Suk were evaluated to be in the earlier half of male forties. 4. The 1 tooth presumed to be Lee, Sam jo was evaluated to be in the latter half of male forties.