PMID- 36607264 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Int J Comput Dent JT - International Journal of Computerized Dentistry IS - 2702-9514 (Electronic) IS - 1463-4201 (Print) IP - 2 VI - 26 PST - ppublish DP - 2023 PG - 149-158 LA - en TI - Predictable esthetics in hybrid and resin-based CAD/CAM restorative materials: Translucency as a function of material thickness LID - 10.3290/j.ijcd.b3762733 [doi] FAU - Schubert, Oliver AU - Schubert O FAU - Graf, Tobias AU - Graf T FAU - Schweiger, Josef AU - Schweiger J FAU - Güth, Jan-Frederik AU - Güth J FAU - Sciuk, Thomas AU - Sciuk T FAU - Erdelt, Kurt-Jürgen AU - Erdelt K CN - OT - hybrid materials OT - PMMA OT - polymer-infiltrated ceramic network OT - resin nano-ceramics OT - translucency OT - translucency equation OT - mathematic analysis OT - CAD/CAM OT - digital workflow AB - Aim: The CAM of esthetically pleasing monolithic dental restorations presents with specific challenges. One vital parameter to consider is the translucency of the materials. Previous studies have proven a correlation between translucency and material thickness for various all-ceramic materials. The aim of the present study was to assess and define the relationship between thickness and translucency in modern resin-based restorative materials. Materials and methods: Specimens fabricated from two resin nano-ceramics (Cerasmart, Lava Ultimate), a polymer-infiltrated ceramic network (Vita Enamic), and a polymethyl methacrylate (Telio CAD) were examined, representing these different material classes. For each material, 12 specimens (n = 12) were fabricated in five thicknesses (0.4, 0.7, 1.0, 1.3, and 1.6 mm; N = 240). The translucency was measured with a spectrophotometer. The total light transmittance for each specimen was calculated applying specialized software. Regression curves were fitted to the results and their coefficient of determination (R2) fit was determined. Results: Logarithmic regression curves showed the best R2 approximation (Cerasmart: R2 = 0.994; Vita Enamic: R2 = 0.978; Lava Ultimate: R2 = 0.997; Telio CAD: R2 = 0.997) to the light transmission values. Conclusions: The results of the present study indicate that the translucency of resin-based materials can be calculated using a mathematic approach to estimate their optical behavior. Cerasmart, Lava Ultimate, Vita Enamic, and Telio CAD exhibit a logarithmic relationship between material thickness and translucency. By determining material-specific coefficients for this logarithmic function, the resulting translucency can be computed for any given material thickness. AID - 3762733