Effect of mouthrinses and repolishing on color stability of hybrid nanoceramic computer-aided design/computer-aided manufacturing material

Aim The aim of the study was to evaluate the effect of different two mouthrinses and repolishing on the color stability of hybrid nanoceramic computer-aided design/computer-aided manufacturing (CAD/CAM) material. Materials and Methods Thirty specimens with dimensions of 1.5 × 12 × 12 mm3 were prepared from Cerasmart CAD/CAM blocks and divided into three groups according to the immersion solutions; distilled water, Oral B, and 0.12% chlorhexidine gluconate (CHX) for 2 min, twice for a day. Initial, 7th day, 14th day, and following repolishing color values were measured with a dental spectrophotometer according to the CIELab system and color changes were calculated (ΔE). Data were statistically analyzed with the Kruskal–Wallis test. Results Oral B and CHX groups showed significantly higher ΔE values than control groups (P ≤ 0.05). No significant differences were found between Oral B and CHX in both ΔE measurements (P ≥ 0.05). There were no significant differences among the 7th day, 14th day, and after repolishing color changes in control and CHX groups (P ≥ 0.05). However, color change after repolishing was significantly less than the 14th day color change (P ≤ 0.05). Conclusions Oral B and CHX caused discoloration on the CAD/CAM restorative material in clinically acceptable limits. Repolishing could provide a significant change only after 14 days of use Oral B.