Abstract
Purpose: The aim of the investigation was to examine the influence of the layering component ratio on the color of high filler containing prosthetic composite resin jacket crowns.
Methods: Double-layered specimens were prepared from the following four types of prosthetic composite resins: Artglass (Heraeus Kulzer), Estenia (Kuraray), Gradia (GC), and Targis (Ivoclar). The hiding effect and the color of abutment specimens were determined on double-layered specimens (thickness: 1.0mm), made of dentin-colored resin pastes and enamel-colored resin pastes, under the condition that there were 11 different component ratios (dentin layer: enamel layer: 1.0:0 to 0:1.0, at even intervals).
Results: No hiding effect was noted for any double-layered specimens. As the thickness of an enamel layer increased, and the thickness of a dentin layer decreased, the hiding effect showed a lower value. Artglass opaque specimens outperformed Estenia opaque specimens in the hiding effect at respective thicknesses. This tendency was most noticeable at Targis. Concerning the color of double-layered specimens, value and yellow of every specimen showed lower values, and red of Estenia and Targis showed higher values, when increasing the thickness of an enamel layer, and decreasing the thickness of a dentin layer. As the thickness of an opaque layer increased, the value, chroma and color difference showed higher values.
Conclusions: It is able to change the color by adjusting the layering component ratio of high filler containing prosthetic composite resin jacket crowns. There was a difference in this tendency depending on the kind of materials. There were some possibility that they might have an influence of layering component ratio on the reflection of background color.
