Abstract
Aim: The purpose of this in-vitro study was to evaluate the effect of repolishing on color stability of hybrid ceramics after immersion in chlorhexidine mouth rinse using spectrophotometric analysis.
Materials and methods: Sixty rectangular specimens were cut of (A1) shade CAD/CAM blocks into 1mm thickness, 14mm length and 14mm width using Isomat4000. Specimens were divided into 3 groups (Vita Enamic, Shofu HC & Nacera hybrid). Color was measured by spectrophotometer before immersion in mouth rinse (subgroup A: control), after immersion in20ml of Chlorhexidine gluconate (CHX) mouth rinse for 120 hours (sub group B) and after repolishing with diacomp plus diamond polishing discs (sub group C). The data were tabulated and statistically analyzed using ANOVA test.
Results: After staining, ∆E of the tested specimens were 5.63±1.12, 3.45±1.84, 3.37±1.15 for Shofu HC, Vita Enamic, and Nacera Hybrid, respectively.
After re-polishing, ∆E of the tested specimens were 6.66±1.45, 4.19±0.98, and 4.13±1.49 for Shofu HC, Nacera Hybrid, and Vita Enamic, respectively.
Conclusion: CHX mouth rinse had the ability to stain the three hybrid materials with highest effect on Shofu HC hybrid material. Re-polishing improved the color of three stained hybrid material with the highest degree of improvement showed on Shofu HC material.