"Color stability and surface roughness of different recent provisional restorative materials" An in vitro study

Abstract

Aim of the study To evaluate the effects of staining solutions on the color stability and surface roughness of different provisional resin materials. Materials and methods A total of one hundred and fife specimens (105) specimens fabricated from 5 provisional resin materials (3conventional provisional restoration materials and 2 CAD/CAM provisional restoration materials). The 105 specimens were divided into 5 groups according to type of provisional restorations twenty one test specimens for each group (N=21).Each material group specimens subdivided into 3 sub-groups according to coloring solutions (n=7) one group immersed in artificial saliva, the second in coffee solution and the third in mouth wash. Baseline color measurements, using spectrophotometer then after 2 and 4 weeks to measure color change (ΔE) by means of the CIE L*a*b* system. Surface roughness also were measured using profilometer for all specimens before and after immersion in staining solutions. Results For parametric data; repeated measures Analysis of Variance (ANOVA) was used to study the effect of provisional material, immersion media, time and their interaction on mean ΔE and surface roughness. In Color change (ΔE) the results showed that provisional material regardless of immersion media and time had a statistically significant effect on mean ΔE. Immersion media regardless of provisional material and time had a statistically significant effect on mean ΔE. Time regardless of provisional material and immersion media had a statistically significant effect on mean ΔE. The interaction between the three variables had a statistically significant effect on mean ΔE indicating that the variables are dependent upon each other. Change in surface roughness (ΔRa), in Comparison between provisional materials: After immersion in the three solutions, there was a statistically significant difference between mean ΔRa of provisional materials, all materials showed significant increase in ΔRa, but BreCam multiCOM showed significant decrease in ΔRa. In Comparison between immersion media With Protemp4, Tempron, Vita CAD temp as well as breCAM.multiCOM; there was no statistically significant difference between mean ΔRa of immersion media, but with Tuff temp; there was a statistically significant difference between mean ΔRa of immersion media.