IADR Abstract Archives
Surface Roughness and Shade of Single Shade Composites Post-Bleaching
Objectives: With the increased esthetic demand in dentistry, the present investigation aims to examine the effects on surface roughness (Ra) and shade (ΔE) with at-home teeth bleaching on single shade composites (Omnichroma & Admira Fusion).
Methods: Four materials were used, two nanohybrid composites (Filtek, Harmonize) and two single shade composites (Omnichroma, Admira Fusion). One hundred five newly extracted caries-free molars were used. Ideal Class I cavities were prepared to apply a standardized cavity preparation. After cavity restoration, the teeth were subjected to bleaching (22% Carbamide Peroxide-PolaNight). An initial reading of surface roughness (Keyence wide-area 3D measurement system) and Shade (Vita Easyshade) was taken. Seven bleaching cycles are performed, with 8 hours on and 16 hours off. After each cycle, shade and surface roughness measurements were evaluated.
Results: All nanohybrid composites material and Omnichroma showed a significant increase in their surface roughness after each cycle of the bleaching process. Single-shade composites, specifically Admira Fusion, showed more stable surface roughness after bleaching cycles. For color stability, both groups of materials show a similar pattern of changes in the shade after bleaching cycles.
Conclusions: Within the limitation of the present in vitro study, the ormocer technology allows for lesser surface roughness. These findings assure that the effect of bleaching on single-shade composite is similar to traditional resin composite. Applying the ormocer technology might improve the performance and longevity of composite resin in the oral cavity.
Methods: Four materials were used, two nanohybrid composites (Filtek, Harmonize) and two single shade composites (Omnichroma, Admira Fusion). One hundred five newly extracted caries-free molars were used. Ideal Class I cavities were prepared to apply a standardized cavity preparation. After cavity restoration, the teeth were subjected to bleaching (22% Carbamide Peroxide-PolaNight). An initial reading of surface roughness (Keyence wide-area 3D measurement system) and Shade (Vita Easyshade) was taken. Seven bleaching cycles are performed, with 8 hours on and 16 hours off. After each cycle, shade and surface roughness measurements were evaluated.
Results: All nanohybrid composites material and Omnichroma showed a significant increase in their surface roughness after each cycle of the bleaching process. Single-shade composites, specifically Admira Fusion, showed more stable surface roughness after bleaching cycles. For color stability, both groups of materials show a similar pattern of changes in the shade after bleaching cycles.
Conclusions: Within the limitation of the present in vitro study, the ormocer technology allows for lesser surface roughness. These findings assure that the effect of bleaching on single-shade composite is similar to traditional resin composite. Applying the ormocer technology might improve the performance and longevity of composite resin in the oral cavity.