Effect of thickness on the translucency of resin-based composites and glass-ceramics

Abstract

This study was aimed to evaluate the effect of thickness (1, 2, 3, and 4 mm) on the translucency of resin-based composites (RBCs) and glass-ceramics, and compare the influence of the thickness of those materials on the translucency parameter (TP) value. The materials were divided into two groups, eight RBCs in Group 1 and five glass-ceramics in Group 2 and TP, ΔL*, Δa*, and Δb* were compared. Statistically significant differences were present in the 2, 3, and 4 mm in the TP, in the 2 and 4 mm in ΔL*, and in all thicknesses in Δa* and Δb* betweent the two groups. The TP of RBCs and glass-ceramics decreased as thickness increased, especially from 1 mm to 2 mm. The TP values of the RBCs were more significantly decreased as the thickness of the material increased from 2 mm to 4 mm than those of the glass-ceramics.

Effects of thickness and polishing treatment on the translucency and opalescence of six dental CAD-CAM monolithic restorative materials: an in vitro study

“…The findings of this study demonstrated that translucency and opalescence varied with different thicknesses. TP 00 exhibited a continuous decline and curvilinear relationship with increasing thickness, consistent with previous studies [ 8 , 14 , 15 , 38 , 39 ]. While, the variations in opalescence (OP) were material-dependent, indicating differences among the materials.…”

“…We observed the highest average variations in TP 00 (TP 00 = 9.72) between 0.5mm and 1.0mm and the lowest (TP 00 = 3.41) between 1.5mm and 2.0mm, aligning with findings by Bayindir et al [ 38 ]. Similarly, Kang et al found that TP decreased as the thickness of resin-based composites and glass–ceramics increased, particularly at lower thicknesses [ 14 ]. However, this observation may be attributed to the limitations of clinical spectrophotometer, as variations in accuracy have been reported between clinical spectrophotometer like Vita Easyshade V and laboratory spectrophotometer [ 40 ].…”

“…These findings indicated that changes in translucency due to thickness were visually apparent. Therefore, careful attention should be given to the adjustment of restoration thickness, as variations of 0.5mm or more can lead to clinically noticeable and potentially unacceptable differences in translucency, particularly for restorations less than 2.0mm thick [ 14 ].…”

“…The six dental CAD-CAM restorative materials tested in this study are outlined in Table 1 . The sample size was determined based on the findings of previous studies [ 3 , 12 , 14 , 32 ]. Using power analysis software PASS 2021 (NCSS, LLC.…”

Effect of Curing Light Beam’s Inhomogeneity on the Microhardness of Resin-Based Composite

“…The ndings of this study demonstrate a signi cant decrease in irradiance with increased RBC specimen thickness across all shades except between 3 and 4 mm A3D shade specimens, which is consistent with the results of a previous study [12]. This observation led to the rejection of the rst null hypothesis.…”