Colorimetric and optical properties of new luting resin cements
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All-ceramic crowns and laminated-veneer crowns have been used in clinical dentistry because these prostheses exhibit excellent esthetics. Their high translucency which is due to the lack of a metal frame, enables them to reproduce the color of natural teeth. On the other hand, because of this high translucency, the colors of ceramic crowns are influenced by both the color of the abutment and of the luting cements lining the crowns. Therefore the choice of a luting cement is a crucial process when finalizing the color of the crowns. In order to utilize the esthetic advantage of all-ceramic and laminated-veneer crowns, an objective way to choose a luting cement is very important. The optical and colorimetric properties of nineteen luting cements from different companies were tested for laminated veneer crowns or all-ceramic crowns. Some cements have quite different optical properties even if their color appearance are visually much alike; the invisible differences sometimes yield significant color difference of a ceramic after luting. The color adjustability of cement can be utilized to optimize ceramic color. In terms of the color adjustability, some cements have high efficiencies and some cements have lower. While opaque cements had higher hiding power (H.P.), which stands for opacity, most cements tested had low H.P. values indicating high translucency. These highly translucent cements are not suitable for deeply colored abutments. As stated above, it is important to recognize that the invisible optical properties of luting cements will yield a visually significant difference in an overlayered ceramic colors. Furthermore, when the surface color of a crown appears as the result of a ceramic-cement-abutment complex, our visual sense can at best only perceive a difference, but can’t choose the better one. Therefore, the optical and colorimetric properties are indispensable to gain a better esthetic appearance of a crown.
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact firstname.lastname@example.org.[xii], 77 leaves : ill.Thesis (MSD) --Booston [sic] University Henry M. Goldman School of Graduate Dentistry, 1995 (Prosthodontics and Biomaterials).Includes bibliographic references: leaves 72-77.
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