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가변형 치과 인상용 트레이로 제작된 모형의 재현성에 관한 연구
엄상호,오상천,Eom Sang-Ho,Oh Sang-Chun 대한치과보철학회 2005 대한치과보철학회지 Vol.43 No.4
Purpose: This study was performed to measure the accuracy of adjustable dental impression trays by a scanning laser three-dimensional digitizer. Materials and methods: The metal stock, individual, and adjustable stock trays were used for 60 stone casts(10 casts each) duplicated a resin master model of mandible and maxilla. The type IV dental stone was poured in a vinyl polysiloxane impressions and allowed to set for one hour. The master model and the duplicated casts were digitized using an optical digitizer. The distance between the reference points were measured and analyzed on the graphic image of 3-D graphic software(CATIA version 5.0). The statistical significance of the differences between the groups was determined by a two-way ANOVA. Results : There were no significant differences between the accuracies of the adjustable stock tray and the master model except only anterior arch width on the upper arch and the diagonal arch length and arch length on one side of the lower arch. Conclusion: The adjustable stock trays showed clinically acceptable accuracies of the study cast produced by them.
엄상호,오상천,동진근,Eom, Sang-Ho,Oh, Sang-Chun,Dong, Jin-Keun 대한치과보철학회 1998 대한치과보철학회지 Vol.36 No.3
The purpose of this study was to compare the wear characteristics of Type III Gold Alloy (Degular C : Degussa AG), VMK 95 (Vita Zahnfabrik), Vitadur Alpha (Vita Zahnfabrik), IPS Empress (Ivoclar-Vivadent) and Targis (Ivoclar- Vivadent). Ten samples of each material were abraded against enamel of extracted incisors for 160,000 cycles on the wear machine. The depth of wear scars on enamel was analized with profilometer (Alpha-step 200;Tencor). And the wear of material specimen was determined with micrometer (PB-IB;Mitutoyo Co. Japan). The results obtained were as follows : 1. Type III gold alloy ($2.47{\mu}m$) and Targis ($5.89{\mu}m$) caused less wear of enamel specimens compared to VMK 95 ($75.59{\mu}m$), IPS Empress ($78.60{\mu}m$) and Vitadur Alpha ($78.89{\mu}m$) (p<0.05). 2. The wear of material specimen when opposing enamel was the lowest in type III gold alloy ($3.0{\mu}m$), followed by Targis ($69.8{\mu}m$), IPS Empress ($148.4{\mu}m$). VMK 95 ($298.0{\mu}m$) and Vitadur Alpha ($300.8{\mu}m$ exhibited the most severe wear against enamel (p<0.05).
치과용 스캐닝 시스템의 개발과 가변형 상악용 트레이의 재현성
차영엽(Young-Youp Cha),엄상호(Sang-Ho Eom) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.3
This study was performed to development a dental three-dimensional laser scanning system and measure the accuracy of new adjustable upper dental impression tray. The metal stock, individual, and new adjustable stock trays were used for 30 stone casts(10 casts each) duplicated a resin master model of maxilla. The dental stone was poured in a vinyl polysiloxane impressions and allowed to set for on hour. The master model and the duplicated casts were digitized using an dental scanning system. The distance between the reference points were measured and analyzed on the graphic image of 3D graphic software of CATIA. The statistical significance of the differences between the groups was determined by a two-way ANOVA. There were no significant differences between the accuracies of the adjustable stock tray and the master model except only anterior arch width on the upper arch. The adjustable upper stock tray showed clinically acceptable accuracies of the study cast produced by them.
차영엽(Young-Youp Cha),엄상호(Sang-Ho Eom) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.3
This study was performed to development a dental three-dimensional laser scanning system and measure the accuracy of new adjustable lower dental impression trays. Multiple impressional laser scanning system and measure the accuracy of new adjustable lower dental impression trays. Multiple impressions of a resin master model were made with custom, stock and new adjustable trays and vinyl polysiloxane impression material. The lower master model and resulting cast were compared using an dental scanning system. Each 3D image was superimposed onto the lower master image and analyzed with custome software. Multiple measurements of the lower master model and casts were analyzed to determine the accuracy of tray types.