수종의 post와 IPS-Empress Ingot 두께가 전부 도재 수복물 최종색조에 미치는 영향
INFLUENCE OF SEVERAL POSTS AND IPS-EMPRESS INGOT THICKNESS ON THE FINAL SHADE OF ALL-CERAMIC CROWNS
복원미, 최근배, 안승근, 박찬운,
소속 상세정보
복원미 ( Bok Won-Mi ) - 전북대학교 치과대학 치과보철학교실
최근배 ( Choi Keun-Bae ) - 전북대학교 치과대학 보철학교실
안승근 ( Ahn Seung-Geun ) - 전북대학교 치과대학 보철학교실
박찬운 ( Park Charn-Woon ) - 전북대학교 치과대학 보철학교실
KMID : 0362420040420050514
Abstract
Statement of problem: All-ceramic restorations have been advocated for superior esthetics. Various post and core systems have been used to improve the strength of damaged teeth, but it is unclear whether they affect the final shade of finished all-ceramic restorations.
Purpose: The influence of different types of post and core systems on light transmission through all-ceramic crowns was assessed by spectrophotometric analysis. Also the masking effect of different thickness of ceramic ingot was evaluated.
Material and Methods : Forty-five sample disks (15mm in diameter) at several thickness(1.0, 1.5, 2.0mm) and value(shade 100, 200, 300) were made in heat pressed ceramic(IPS-Empress). Background specimens simulating gold-alloy cast posts(Type III casting gold alloy), metal posts(Ni-Cr casting alloy) and ceramic posts(CosmoPost) were fabrica-ted. Resin composite(Z250, A3 shade) was used as a tooth substrate reference. For each combination, the change in color was measured with a spectrophotometer. Readings were performed for 2 conditions (1) ability of ceramic to mask the core in relation to its thickness(1.0, 1.5, or 2.0mm) ; (2) influence of post and core types on the final color of the ceramic. Data were recorded according to the CIE L*a*b* systems and color difference(DeltaE) was calculated.
Results: 100 shade ingot: when ceramic thickness was 1.0mm, DeltaE value for ceramic post larger than 1 but DeltaE value for metal and gold post was larger than 2. For ceramic thickness of 1.5mm, only DeltaE value for metal was larger than 2, and the other samples’’ DeltaE value was smaller than 2. For ceramic thickness of 2.0mm, DeltaE values for all specimens was smaller than 2. 200 shade ingot: when ceramic thickness was 1.0mm, DeltaE value for ceramic post was smaller than 1 but DeltaE value for metal and gold post was larger than 2. For ceramic thickness of 1.5 mm, only the DeltaE value for metal was larger than 2, and the other samples’’ DeltaE value was smaller than 2. For ceramic thickness of 2.0mm, DeltaE values for all specimens was smaller than 1. 300 shade ingot: when ceramic thickness was 1.0mm, only DeltaE value for metal was larger than 2 and the other samples’’ DeltaE value was smaller than 2. For ceramic thickness of 1.5mm, DeltaE values for all specimens was smaller than 1. For ceramic thickness of 2.0mm, DeltaE values for all specimens was smaller than 1.
Conclusion: The final esthetic result of the IPS-Empress glass-ceramic restoration was not affected by the presence of different core materials when the thickness was more than 2.0 mm. When ceramic thickness decreases to 1.5mm, it is advised to take the substrate aspects into consideration. If the ceramic thickness is less than 1.0mm, using the tooth color matched substrate is strongly recommended.
키워드
All ceramic crown;IPS Empress ingot;Spectrophotometer
원문 및 링크아웃 정보
등재저널 정보