• 대한소아치과학회지
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• 제35권2호
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• pp.268-277
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• 2008

상악 정중부 과잉치는 혼합치열기 및 영구치열기 아동에서 많은 병발증을 야기한다. 본 연구에서는 지난 6년간 경북대학교 병원 소아치과에 내원한 상악 정중부 과잉치를 지닌 1171명의 아동을 대상으로 임상적, 방사선학적 검사를 통해 상악 정중부 과잉치의 양상과 병발증을 조사하고 발거 후 병발증의 치유율에 관해 조사 평가하여 다음과 같은 결론을 얻게 되었다. 1. 상악 정중부 과잉치를 발견하게 된 동기로는 다른 원인으로 상악 중절치부를 우연히 방사선사진 촬영한 경우 23.4%, 상악 정중부 과잉치의 맹출 16.1%, 충치 치료를 위해 상악 중절치부를 방사선사진 촬영한 경우 15.1%로 나타났다. 2. 상악 정중부 과잉치로 인한 병발증이 나타나지 않은 경우는 36.8%, 인접 영구전치의 맹출 지연을 야기한 경우가 34.4%, 정중 이개가 16.1%였다. 3. 상악 정중부 과잉치의 외과적 발거 시 인접 영구중절치의 치령은 치근길이의 1/2이상에서 2/3이하가 54.7%였다. 4. 상악 정중부 과잉치의 발거 후 정중 이개와 인접 상악 영구전치의 맹출 지연 치유율은 외과적 발거 시 인접치의 치령이 치근 길의 1/2이하인 경우 맹출 지연에서 65.27%로 유의성있게 높았으며(P<0.05), 정중 이개에서는 인접측절치와 중절치 간의 총생이 없는 경우에서 그 치유율이 68.23%로 유의성있게 높았다(P<0.05).

• Restorative Dentistry and Endodontics
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• 제35권1호
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• pp.30-39
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• 2010

본 연구에서는, 삼차원 유한요소분석법을 이용하여 복합레진 및 도재 라미네이트로 전치부 치간이개를 폐쇄할 때, 치간이개의 간격과 수복방법이 수복물의 접착계면에서의 응력분포에 미치는 영향을 비교하였다. 복합레진 혹은 도재 라미네이트로 수복된 모습의 유한요소모델을 형성하여 접착계면에서의 von Mises stress 분포 양태를 분석하였다. 수복형태는 크게 네 가지 범주를 고려하였다. Type I, 복합레진으로 인접면을 최소한으로 수복하는 경우; Type II, 치아 삭제 없이 복합레진으로 순면의 절반까지 수복하는 경우; Type III, 치아삭제 후복합레진으로 순면의 2/3까지 수복하는 경우; Type IV, 도재 라미네이트로 수복하는 경우 이 실험의 한계 내에서 다음과 같은 결론을 내릴 수 있었다. 모든 수복형태에 대해 치간이개 간격이 넓어질수록 접착계면에서 발생하는 최대응력 값은 증가하였으며, 도재 라미네이트로 치간이개 부위를 수복한 경우(Type IV)가 복합레진으로 수복한 경우(Type I, II, III)에 비해 높은 최대응력값을 나타내었다. 그러나 치간이개 간격이 넓어질수록 도재 라미네이트와 복합레진에서 발생하는 최대응력값의 차리는 감소하였으며, 치간이개 간격의 증가에 따른 최대응력값의 증가율은 도재 라미네이트가 복합레진으로 수복하는 경우보다 낮았다.

• 대한치과기공학회지
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• 제18권1호
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• pp.95-115
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• 1996

The esthetic factor for the esthetic prosthesis were studied on 300 persons. The praaticipants were 150 students registered under the Deparment of Dental Laboratoy Technology, Jisan Junior College at the present day of June, 1995 and their mothers. The results were as follows; 1. The number of persons with 28 teeth in their oralcatity was highest(P<0.01). They complained that they have only 28 teeth bacaues of the loss(deficiency) fo teeth due to their impacted teeth and dental caries. 2. The presons with feelings of dissatisfaction were large in number(P<0.01). They were dissatisfied with an abnormal tooth form(33.5%), tooth position(31.7%), tooth color(31.1%), and tooth size(3.7%) in order(P<0.01). 3. In their facial form, the most numerous were men with square form and women with ovoid form(P<0.01). Among the whloe number fo facial forms it appeared to decresae in the order of ovoied(41.8%), square(32.7%), square+tapered(20.5%), and tapered form(5%)(P<0.01). In a profile form, the most numerous were men with A form and women with B. Among the whole participants the most numerous were persons with B form and persons with A and C form were next in oder of numbers(P<0.01). 4. In discoloration of teeth, the most numerous were persons who have no discoloration. 5. In the esthetic recovery of anterior prosthesis the color matching of proximal teeth was not correct, but the outline of proximal teeth was to be reproduced correctly. 6. In the diastema of teeth, the number of persons who have no diastema was higher than that of persons who have a disatema(P<0.01) Among the persons who have diastema the most numerous were persons who have a diastema, and next were 2, 4, 3 and 5 diastemas in order. 7. In a meeting point of the midline of the body and the tooth the number of person hanving a meeting point was higher than that of persons who did not fit each other(P<0.01). The bias direction of midline teeth appeared to be affected by chewing direction, prosthesis location, and posterior location. 8. The length and width of teeth in the tooth size were suitable(P<0.01). The number of persons who have central teeth longer than lateral teeth was high(P<0.0). 9. In the results of smile analysis, the line form connected with incisal edge of upper canine were parallel(P<0.01). When smile the location fo upper lips should be in accord with the central area of teeth(P<0.01) and lower lip should be atteched to the edge of anterior teeth in order to be esthetic. 10. Among the number of upper teeth we can see the most numerous were 8 teeth and next were 10, 6 and 12 in order.

• 대한치과의사협회지
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• 제18권8호통권137호
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• pp.653-656
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• 1980

The authors have observed a case of spontaneous closing of anterior diastema, after removal of impacted paired simple cornical mesiodenses, without active orthodontic treatement in a 8-years-old male patient. It is important that we should periodically check up and early detect them form the age of deciduous dentition.

• 대한치주과학회:학술대회논문집
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• 대한치주과학회 2001년도 제41회 종합학술대회 연제초록
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• pp.117-117
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• 2001

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2006년도 Spring Scientific Meeting(the 125th) of Korean Academy of Conservative Dentistry
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• pp.241-241
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• 2006

• 대한치주과학회:학술대회논문집
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• 대한치주과학회 2000년도 제40회 종합학술대회 연제초록
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• pp.112-113
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• 2000

• 대한소아치과학회지
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• 제24권3호
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• pp.597-601
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• 1997

This paper presents improper use of latex-elastic ring in movement of teeth and its consequence. Simple orthodontic movement of teeth including closure of diastema may be achieved by the use of simple method with fixed or removable appliance associated with latex-elastic ring. But, if it is used alone, it acts as a local irritant and then produces localized periodontitis. In case of localized periodontitis resulting from latex-elastic ring, diagnosis is difficult because the patient is usually unaware of the presence of the rings on the roots of the involved teeth and because the ring is not probed and is radiolucent and therefore not discernible radiographically and clinically. Occasionally, surgery is requred for the detection. This case emphasizes the necessity that the use of latex-elastic ring in closing diastema should be accompanied with removable or fixed appliance as well as close professional supervision. Its use without adequate provision for stabilization or retention on the crowns of teeth results in destruction of periodontal support and the teeth may be lost.

• Imaging Science in Dentistry
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• 제38권2호
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• pp.103-107
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• 2008

Purpose: The purpose of this study was to evaluate the relationship between the position of mesiodens and its complications. Materials and Methods: The subjects for this study consisted of 172 patients with mesiodens. Panoramic radiographs and cross-sectional tomography were taken of all of the subjects. Their clinical records and radiographs were analyzed in order to study the direction and vertical and sagittal position of mesiodens, as well as complications caused by mesiodens. Results: The number of mesiodens was one in 112 cases (65.1%) and two in 60 cases (34.9%). Complications were found in 121 mesiodentes (52.2%), with being median diastema the most frequent. The incidence of complications was high in erupted mesiodens (75.0%), in horizontal mesiodens (89.8%) and in mesiodens located within the arch (75.7%), but was low in mesiodens impacted above apex (29.8%), in normal position (34.4%) and in palatally positioned mesiodens (46.5%). Conclusion: It was suggested that the frequency of complications was different according to the vertical position, the direction of the crown and the sagittal position.

• 대한소아치과학회지
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• 제24권4호
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• pp.758-762
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• 1997

There are various types of localized tooth malpositions in the mixed dentition, such as abnormal tooth axis, anterior crossbite of some incisors, impaction, midline diastema, ectopic eruption, and so forth. We, Pediatric Dentists, have usually used removable appliances for these instances. But, removable orthodontic appliances, as is known, have marked limitations in some situations, for example, severe rotation, intrusion and extrusion, root torque, closure of large diastema, traction of impacted tooth, etc. In such cases, Whip spring, combined with fixed or removable appliance, can increase utilities of removable orthodontic appliances. The authors have applied whip springs to some cases showing localized positional and arrangement problems, and have witnessed the results as follows; 1. The refined and elaborate control of direction and magnitude of force by the operator, and accurate compliance of the patients were requisite for the treatment with it. 2. It showed special effectiveness for de rotation of incisors. Although it yields some benefit for root movement, the special consideration for incomplete roots in this age bracket was required. 3. In the localized malalignment cases in mixed dentition, uncurable with traditional removable appliances but practically unrealistic with fixed appliance therapy, the whip spring was thought to be a good alternative.