• 치과방사선
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• 제29권2호
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• pp.507-521
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• 1999

Osteopetrosis is an uncommon hereditary bone disorder whose prominent radiologic feature characterized by increased bone density. The authors reported a 7-year-old male patient who referred from local dental clinic for dental problems such as early exfoliation of deciduous teeth(#54,73,83) and delayed eruption of permanent teeth(#31.41.36.46). The patient appeared as a poorly developed. Dental X-ray films showed early exfoliation of deciduous teeth, delayed eruption of permanent teeth, and rampant caries. Lateral view of skull demonstrated increased opacity of calvarium, facial bones, and skull base. Generally the skeletal density is greatly increased throughout all bones. Facial CT showed poor development of paranasal sinuses and mastoid air cells. No hematopoietic and neurologic complications such as anemia, thrombocytopenia, blindness and deafness were found. Also mental retardation was not found. The final diagnosis of this case was a osteopetrosis tarda. Sometimes patient with osteopetrosis tarda may be developed dental problems prior to severe systemic symptoms. The dentist can be the first clinician to see the patient. It is very important for the dentist to have the knowledge of the osteopetrosis and to care the patient's dental problems to prevent complication such as osteomyelitis of jaws.

• 대한소아치과학회지
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• 제51권1호
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• pp.99-108
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• 2024

Early loss of the primary maxillary second molar can lead to complications in which mesial drift of the adjacent first molar (M1) can disturb eruption of the succedaneous second premolar (P2). This study reports two cases of space loss for P2 caused by early exfoliation of its predecessor. After the eruption of the first premolar, the Jones jig appliance was used to distalize M1 and regain space for the eruption of P2. The appliance was further utilized to align the palatally erupted P2 into the dental arch. In both cases, the space and corrected position of P2 were well maintained. Early exfoliation of the primary second molar caused by mesial encroachment of M1 is a common phenomenon, and pediatric dentists should attend to this during routine examinations. An appropriate intervention should be initiated when the primary second molar is lost during the mixed dentition period. If used with careful anchorage control, the Jones jig appliance can effectively resolve this problem.

• 한국건축시공학회지
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• 제7권4호
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• pp.125-132
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• 2007

The use of Self-Leveling material is increasing recently. This paper assesses the quality of surface layer of concrete floor when Self-Leveling material is defective. The paper shows how to predict the defect of SL material before construction begins. The relationship between the quality of surface layer of concrete floor and the defect of SL material was determined and the quality of surface layer of concrete floor was then estimated. The relations between the quality of surface layer and the defect of SL material were determine considering surface strength, moisture, and consistency of surface layer. Absorbing amount was used as the indicator of consistency and the absorbing amount of test material was measured. Then the relations between the test material and surface strength were determined. Generally concrete floor with greater consistency has greater surface strength, however in this study, we hound that high impact concrete floor could have lower surface strength as the consistency gets bigger. The relations between the level of defect occurred in SL material and the quality of surface layer were examined and we clarified that the surface layer with lower consistency gets higher possibility to occur exfoliation in early stage, one or two weeks after constructing SL material. When the consistency is sufficient, the occurring situation of defect depends upon the moisture of surface layer. Little amount of moisture gets higher possibility not to occur the defect. As the amount increases, fissure generates and early exfoliation may occur. In addition, the level of fissure is highly related with the surface strength.

• 대한소아치과학회지
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• 제27권3호
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• pp.438-443
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• 2000

이소 맹출(ectopic eruption)은 치배가 그 발생지에서부터 정상 맹출 경로가 변화된 것을 의미한다. 즉, 치아가 치조골 혹은 기저골의 어느 위치에서 정상 맹출 과정에서 벗어나 비정상적인 위치나 방향으로 맹출하게 됨을 말한다. 이에 대한 다른 예로써 보다 드물고 특별한 치아 이상으로 전위(transposition)가 있는 데, 이는 같은 치열궁상에서 치아의 위치가 서로 바뀐 것을 말한다. 본 증례는 하악 측절치가 혼합치열기 초기에 제 1유구치 하방으로 이소 맹출중인 치아 이상을 보여주는 데, 이 하악 측절치의 치관은 원심으로 심하게 경사졌고, 인접 유견치와 제 1 유구치의 치근 흡수를 야기하고 있다. 이와 같은 맹출 이상의 원인은 아직 확실히 규명되지 않았으나 현재 다음의 몇가지 원인을 생각할 수 있다.; (1)과거의 외상 병력 (2)유치의 만기 잔존, (3)유치의 조기 탈락, (4)유전적 요인. 치료법으로는 조기의 interceptive treatment와 보다 나중의 definitive treatment로 구분된다. 이소 맹출하는 하악 측절치는 인접 견치와 완전 전위되는 경향이 있으므로 조기의 교정적 간섭이 요구된다. 이는 이후의 영구치 발거나 완전 전위를 예방할 수 있을 것이다 이러한 측절치의 이소 맹출을 바로잡는 데 있어서 고려해야할 중요한 요인은 치료 시기로써 일반적으로 혼합 치열기의 inter-transitional period 초기에 발육 중인 견치에서부터 멀리 떨어져 있을때, 해당 측절치의 levelling과 근심화가 시행되어야 할 것이다. 본 증례는 아직 영구 견치가 맹출하기 이전인 혼합 치열기 초기에 적극적인 교정적 처치를 시행하여 이소 맹출중인 측절치를 본래 위치로 유도하였다.

• 대한소아치과학회지
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• 제26권2호
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• pp.232-239
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• 1999

유치의 탈락과 영구치의 맹출은 정상적이고 예측 가능한 생리적인 과정이다. 치아 발육의 정확한 예측은 어린이의 치료 계획의 수립에 있어서 중요하다. 어린이의 연령과 그에 해당하는 치아 발육의 정상치가 여러 연구자들에 의해 조사되었다. 그러나 다양한 요소에 의해 치아의 정상 발육이 영향받을 수 있고 치아의 맹출을 촉진하거나 지연시킬 수 있다. 특히 농양이 있던 유치의 조기 발거나 탈락은 영구 계승치의 맹출에 뚜렷한 영향을 미칠 수 있다. 유치의 농양은 영구치를 덮은 골을 흡수시키고 따라서 발육상태에 관계 없이 영구치는 맹출할 수 있다. 유구치가 일찍 탈락 또는 발거되고 영구 계승치의 맹출이 조기에 일어나면 치아의 편향과 회전, 맹출 순서의 변경, 이웃 치아의 매복, 중심선 변위 등의 다양한 중요한 사건이 발생할 수 있다. 이에 저자는 서울대학교 병원 소아치과에 내원한 환아들의 조기 맹출한 영구 계승치의 임상적, 방사선학적 특징과 그로 인한 영향을 알아보고, 그에 따른 적합한 처치와 추후 관찰 사항을 보고하고자 한다.

• 대한소아치과학회지
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• 제24권3호
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• pp.543-548
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• 1997

The first permanent molar takes important place in the occlusion. Malposition of the lower first molar is frequently due to mesial migration, which is occurred by early exfoliation of the second deciduous molar or proximal caries of deciduous teeth. Above things happen without any consideration of space maintainer, prompt measures for space regaining have to be started. Especially in the case with early loss of the second deciduous molar, it has been said that there is no suitable appliance for maintaining the space before the eruption of the permanent first molar. In distalizing the upper first molar, headgears have been routinely used, which its result was definitely depended on cooperation of the patients. Nowadays, appliances such as pendulum appliances, K-loop, magnets, which can be used without cooperation of the patients, are introduced. Jones Jig, one of the molar distalizing appliances, was used on the patients who visited department of pediatric dentistry in Seoul National University Dental Hospital complaining of no eruption space for the lower second bicuspid. Either removable splint or lingal arch was used as the anchorage. Jones Jig was favorably used in the lower molar, where vestibule is shallow, and this is a case report on the satisfactory result thereof.

• 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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• 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.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2001년도 학술논문발표회
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• pp.8-13
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• 2001

In recently, polishing tile(porcelain homogeneous polished tile) was used in the construction field as a finishing material. But, there happened some problems such as tile exfoliation by construction condition in early ages. Also, in the dry wall system which used to lightweight wall, for use of polishing tile on dry wall, the examination of adhesive stability of polishing tile is needed. In this Paper, adhesive strength of Polishing tile was investigated by tile bond types on gypsum board and non asbestos board coated by tar-urethane and polymer modified cementitious waterproofing membrane(Series I). Then, the effect of heat stress and vibration was estimated on gypsum and non asbestos board(Series II).

• 대한치과의사협회지
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• 제50권6호
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• pp.312-321
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• 2012

Permanent canine are very important teeth in point of function as well as esthetic. Therefore impaction of canines is a frequently encountered clinical problems. The incidence of impaction ranges between 1-3%. The cause of canine impaction can be result of ectopic position of tooth germ, defect of dental follicle, early loss or delayed exfoliation primary canine, space problem, supernumarary teeth, cyst, odontoma, Impaction frequently involves further complication such as root resorption of adjacent teeth, cyst formation and migration of the neighboring teeth. Various treatment modalities include extraction of primary canine, surgical opening and orthodontic traction, autotransplantation, surgical extraction of impacted canine.