Pre-Heating of Low-Shrinkage Composite Resins: Effects on Color Stability and Surface Roughness

Abstract

Objectives: The present study aimed to investigate the effect of preheating on the color stability and surface roughness of a silorane-based composite resin.
 Materials and Methods: A total of 44 Filtek P90 composite resin disks, (10mm×1mm), were fabricated using plastic molds and were divided into two groups. In group 2, the composite resin syringes were placed in a thermostatically controlled water bath at 55‒60°C before preparing the disks. After polishing the samples with silicon carbide papers, they were stored in distilled water for 48 hours. Roughness and color parameters were then measured in two stages: immediately after retrieval from distilled water and after 40 days of storage in tea solution. Finally, the differences in roughness and color parameters were recorded. Independent sample t-test and regression analysis were used at a significance level of P<0.05.
 Results: Based on the findings of the present study, there was no significant difference among the mean ∆E values (P=0.4); however, a significant difference in mean surface roughness (P=0.01) was found between the two groups. Regression analysis showed a significant relationship between the study groups in terms of surface roughness and ΔE values​ (preheated: r2 = 0.73; non-preheated: r2= 0.76).
 Conclusion: Filtek P90 silorane-base composite showed ΔE>3.3 and surface roughness above 0.2µ under preheated and non-preheated conditions and discoloration increased following preheating.

Effects of Fluoride Varnish on Roughness of Polyacid-Modified Composite Resins at Different Temperatures: An In Vitro Study

“…23 Oskoee et al found an increase in the roughness values of micro hybrid-based composite resins that were preheated, which contradicts these studies. 24 Thus, the goal of this study is to assess how heating the fluoride varnish material affects its roughness. Bacterial uptake of restorative materials is directly correlated with their surface roughness.…”

In Vitro Evaluation of Mechanical, Surface, and Optical Properties of Restorative Materials Applied with Different Techniques

“…Therefore, the second null hypothesis of this study was rejected. The discoloration exhibited by a material has been shown to be either directly or indirectly related to the surface roughness of the material [35,36]. Chowdhury et al [37] reported that, as the surface roughness increased, the discoloration also increased.…”

“…Previous studies have reported that coffee is the most frequently applied solution for coloring resin composites [21,[39][40][41][42]. Discoloration, which mostly occurs due to the adsorption and absorption of exogenous pigments, is an important and influential factor of the color instability of restorations [35]. Coffee solutions have yellow pigments of different polarities.…”