• 대한치과의사협회지
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• 제42권9호통권424호
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• pp.638-642
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• 2004

• 대한심미치과학회지
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• 제26권2호
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• pp.68-83
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• 2017

치과용 CAD/CAM이 점차 보급됨에 따라, 사용할 수 있는 material의 종류와 활용할 수 있는 범위도 늘어나고 있다. 치과용 캐드캠의 가장 큰 장점은 한번의 방문으로 최종 보철물을 제작 할 수 있다는 점인데, 지르코니아나 복잡한 심미 보철의 경우 하루만에 제작하기 힘든 경우가 많다. 이러한 경우 임시치관용 PMMA 재료를 사용하여, 환자에게 심미성과 기능성을 가진 임시치관을 제공할 수 있으며 최종보철물에 대한 test crown이나 template등으로 활용할 수 있다. 그리고 원내에서 5축 밀링기로 가공한다면 임시치관을 빠른 시간에 큰 범위까지 정밀하게 제작할 수 있다. 이 글에서는 원내에서 가공하는 PMMA 임시치관의 다양한 활용과 임상증례에 대해 살펴보고자 한다.

• The Journal of Advanced Prosthodontics
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• 제12권1호
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• pp.38-48
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• 2020

PURPOSE. The objective of this literature review was to analyze the cumulative survival rates (CSRs) of rigid and non-rigid double-crown-retained removable dental prostheses. MATERIALS AND METHODS. Screening of the literature published from January 1995 to December 2019 was performed by using electronic data base (Pubmed) and manual search. The CSRs of rigid and non-rigid double crown removable dental prostheses were investigated. RESULTS. A total of 403 articles were reviewed and 56 relevant articles of them were selected. Subsequently, 25 articles were included for data extraction. These articles were classified according to rigid and non-rigid type double crowns and further subdivided into teeth, implants, and teeth-implant combination types. The CSRs of rigid type double crown ranged from 68.9% to 95.1% of 5 to 10 years in tooth abutments, 94.02% to 100% over a 3-year mean observation periods in implant abutments, and 81.8% to 97.6% in tooth-implant combination. Non-rigid type double crowns had various CSR ranges from 34% to 94% maximum during 10 years observation in teeth abutment. The CSRs of non-rigid type had over 98% in implant abutments, and ranged from 85% to 100% in tooth-implant combination. CONCLUSION. The CSRs of double crowns varies according to types. With accurate evaluation of the remaining teeth and plan of the strategic implant placement, it could be successful treatment alternatives for partially or completely edentulous patients.

• 한국융합학회논문지
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• 제9권9호
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• pp.117-122
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• 2018

본 연구는 PET-CT 검사를 시행할 때 치과보철물에 의해 발생되는 CT의 HU(Hounsfield Unit) 값을 금속의 종류에 따라 측정하고, PET 영상의 왜곡정도와 표준섭취계수(SUV)의 변화를 확인하여 영상 판독 시 오류의 감소방안을 제시하고자 하였다. 실험방법은 실제 치아와 메탈 크라운, 골드크라운, 티타늄, 지르코니아의 치과보철물을 이용하여 PET-CT 검사를 실시하였다. 일반 치아와 비교한 결과 HU 값이 증가함에 따라 SUV 값이 증가되는 것을 확인하였고, 메탈 크라운, 티타늄, 지르코니아의 SUV 값은 37% 정도 증가되었고, 골드 크라운에서는 45.4%로 가장 많이 증가했다. 그리고 일반치아, 메탈크라운, 티타늄, 지르코니아에서 영상 왜곡은 미미했지만, 골드 크라운에서는 선속경화현상이 심하게 발생하였고, 영상 왜곡이 나타났다. 따라서 치과보철물의 금속종류는 SUV 값에 영향을 미치기 때문에 치과 보철물 중에서 골드 재질을 사용한 환자를 진단할 때에는 영상 판독 시 보정된 PET 영상보다는 NAC(무보정) PET 영상을 확인한다면 판독에 도움을 줄 수 있을 것으로 생각된다.

• Restorative Dentistry and Endodontics
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• 제43권1호
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• pp.9.1-9.6
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• 2018

The objective of this case report is to introduce a simple technique for simultaneously taking a closed-mouth impression and functionally generated path (FGP) for a full coverage crown restoration. A monolithic zirconia crown was the restoration of choice. An alginate impression of the abutment tooth was taken to fabricate a custom-made closed-mouth impression tray covering the abutment tooth and the adjacent teeth. The tray had an FGP table and an abutment tray in cameo and intaglio surfaces, respectively. The impression was taken with silicone impression material after adjusting the abutment tray and inscribing the FGP using self-curing acrylic resins. Plaster casts were made from the impression, and a zirconia crown was fabricated. The crown was cemented to the abutment tooth with minimal adjustments. This simple technique resulted in a well-fitting crown that accounted for mandibular movements. Using the custom closed-mouth impression tray incorporating an FGP table simultaneously aids in fabricating an accurately fitting restoration that incorporates harmonious mandibular movements using a single impression capture.

• The Journal of Advanced Prosthodontics
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• 제8권4호
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• pp.329-332
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• 2016

Fabricating a surveyed prosthesis beneath an existing partial removable dental prosthesis (PRDP) is a challenging and time-consuming procedure. The computer-aided design/computer-assisted manufacturing (CAD/CAM) technology was applied to fabricate a retrofitted, surveyed zirconia prosthesis to an existing PRDP. CAD/CAM technology enabled precise and easy replication of the contour of the planned surveyed crown on the existing abutment tooth. This technology ensured excellent adaptation and fit of newly fabricated crown to the existing PRDP with minimal adjustments. In this case report, a seventy-year-old male patient presented with fractured existing surveyed crown. Because the existing PRDP was serviceable, new crown was fabricated to the existing PRDP.

• 대한소아치과학회지
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• 제35권2호
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• pp.324-332
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• 2008

혼합 치열기 및 초기 영구치열기의 소아, 청소년에서 외상에 의한 치관 파절은 빈번하게 발생한다. 치관파절은 치수의 노출 유무에 따라 단순 치관파절, 복잡 치관파절로 분류된다. 치수가 노출된 복잡 치관파절의 경우 치수에 대한 고려 및 처치가 필수적인데, 초기 영구치열기에는 전치부 치근의 발육이 완전히 이루어지지 않았기 때문에 완성된 치근을 가지는 치아보다 치료가 복잡하다. 치료의 목적은 적절한 치수 치료를 통해 치근의 완성을 도모하는 것으로 이를 위해 직접 치수복조술, 부분 치수절단술, 치경부 치수절단술의 방법을 이용한다. 이 중 부분 치수절단술은 성공률도 높으며 치경부 치수를 보존하기 때문에 여러 장점을 지니는 치료방법이다. 복잡 치관파절을 주소로 내원한 환자에서 부분 치수절단술을 시행하여 양호한 결과를 나타내어 이를 보고하는 바이다.

• 대한치과기공학회지
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• 제28권2호
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• pp.399-415
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• 2006

This research collected the curriculum for Dental Technology from a total of 20 schools-eighteen 3-year colleges and two 4-year colleges all in Korea. We divided 4 groups as regions from 20 colleges, and we compared the credit of university students who finished all the required courses and want to apply for a national examination and the credit to be had from another educational institution. As a result of this analysis, we get the conclusion below: 1. In the curriculum, average credit are shown like this order: Science of Dental materials 5.45 Orthodontics Technology 4.10 Dental Morphology 3.80 Oral Anatomy 3.05 Dental Health Science 2.45 Public Health Science 2.40 These show that the credit of fundamental studies, which is in order to take Dental Prosthetics, is increased. 2. In the curriculum, average credit are shown like this order: Crown and Bridge Technology 7.25 Removable Partial Dentures Technology 6.55 Complete Dentures Technology 6.40 Dental Ceramics 4.95 Inlay Technology 2.30 3. In the curriculum, average credit are shown like this order: Crown and Bridge Technology(Lab) 5.90 Removable Partial Dentures Technology(Lab) 5.35 Complete Dentures Technology(Lab) 5.30 Dental Ceramics(Lab) 4.35 Average points between regions in the subject of a national written exam are mostly similar, but the deviation among Science of Dental Materials, Crown and Bridge Technology, Removable Partial Dentures Technology, and Complete Dentures Technology is large. And in the practical technique exam, the deviation among Crown and Bridge Technology(Lab), Removable Partial Dentures Technology(Lab), and Complete Dentures Technology(Lab) is great.

• The Journal of Advanced Prosthodontics
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• 제13권3호
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• pp.127-135
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• 2021

Purpose. The aim of this study is to compare the hardness according to the conditions of metal alloys. Moreover, the correlation between the cast crown hardness before and after wear testing and the degree of wear for each dental alloy was assessed. Materials and Methods. Cast crowns of three metal alloys (Co-Cr, gold, and Ni-Cr alloys) opposing smooth-surface monolithic zirconia were used. The Vickers microhardness of the ingot (which did not undergo wear testing) and the cast crown before and after wear testing were measured for each alloy. Two-way ANOVA and Scheffé tests were used to compare the measured hardness values. Moreover, the Pearson correlation coefficient was used to evaluate the relationship between the surface hardness and the wear of the cast crown (α=.05). Results. There was no significant difference in the hardness before and after wear testing for the gold alloy (P>.05); however, the hardness of the worn surface of the cast crown increased compared to that of the cast crown before the wear tests of Ni-Cr and Co-Cr alloys (P<.05). Furthermore, there was no correlation between the wear and hardness of the cast crown before and after wear testing for all three metal alloys (P>.05). Conclusion. There was a significant difference in hardness between dental alloys under the same conditions. No correlation existed between the surface hardness of the cast crown before and after wear testing and the wear of the cast crown.

• 대한치과교정학회지
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• 제16권2호
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• pp.123-133
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• 1986

The purpose of this study was to collect the information of the straight-wire appliance and to determine the amount of second-order bends in clinical orthodontics. The author analysed the study model of 50 individuals with normal occlusion and results were obtained as follows. 1. The crown angulation was 4 degree in upper central incisor, 7 degree in upper lateral incisor, and 0 degree in lower central incisor and lateral incisor. 2. The crown angulation was 8 degree in upper cuspid and 2 degree in lower cuspid. 3. The crown angulations were 4 degree in upper first bicuspid, upper second bicuspid and lower second bicuspid and 1 degree in lower first bicuspid. 4. The crown angulation was 3 degree in upper first molar, 0 degree in upper second molar, 5 degree in lower first molar and 8 degree in lower second molar. 5. The crown angulations in lower arch were progressively increased from first premolar to second molar. 6. In upper arch, as the crown angulation of one tooth was increased, those of adjacent teeth were increased, too. 7. In the case of lower arch, the crown angulation of cuspid was increased as that of lateral incisor was increased, the crown angulation of second premolar was increased as that of first premolar was increased, and similarity the crown angulation of second molar was increased as that of first molar was increased.