Effect of carbamide peroxide bleaching agent on the surface roughness and gloss of a pressable ceramic

Abstract

Objective This study evaluated the influence of carbamide peroxide, 10% and 16%, on the surface roughness and gloss of a pressable ceramic. Materials and Methods Carbamide peroxide (10% or 16%) was applied for 4 hours or 3 hours per day for 14 days, respectively, in pressable ceramic discs (14 mm × 2 mm). Specimens were stored in distilled water at 37°C. Surface roughness and gloss were determined before carbamide peroxide application (T0), 7 days (T7) and 14 days (T14) after the initial treatment. ANOVA was used with repeated measures and multiple comparisons with a Bonferroni adjustment (P < 0.005). Results Significant increase in surface roughness was observed over time (P < 0.001), with T0 < T7 < T14. When the gloss was analyzed, significant differences were found (P < 0.001), control group showed a higher gloss than those of the 10% and 16% groups. Significant decrease in gloss was observed over time (P < 0.001), with T0 > T7 > T14. Conclusions The surface roughness of pressable ceramics increased, while their gloss significantly decreased when 10% or 16% carbamide peroxide was applied. The specimens treated with 16% carbamide peroxide exhibited higher surface roughness and less gloss than the specimens treated with 10% carbamide peroxide. Clinical significance This study found that carbamide peroxide gels commonly used in at‐home procedures influenced the surface roughness and gloss of a pressable ceramic that is often used for rehabilitation esthetics.

The effect of bleaching on the optical and physical properties of externally stained monolithic zirconia

“…These roughness changes were not statistically significant and were less than the clinically important cutoff point of 0.30 μm (de Selva , 2006). In several studies, it has been shown that CP gel at different concentrations, including 10, 16, and 35%, increased the surface roughness of dental ceramics (Moraes et al, 2006;Rea et al, 2019;Vanderlei et al, 2010). However, in Turker et al's study, no changes were observed with CP 10% gel at three different pH values (Turker & Biskin, 2003).…”

How a 16% Carbamide Peroxide Home Bleaching Agent Affects the Surface Properties of Chairside CAD/CAM Materials?

“…When bleaching is applied in-office, esthetic restorations will have adequate protection. However, if the bleaching is done at home, the bleaching agent might contact the restorations, and the restorations might be damaged (17). Little is known about the influence of bleaching agents on new chairside CAD/CAM materials.…”

“…These changes can be caused by chemical reactions between the bleaching agent and dental materials (18). A reduction in microhardness due to organic matrix erosion might affect the surface properties (e.g., surface energy, roughness and gloss) of materials and influence the durability of restorations (2,17). The increase in surface roughness of material surfaces can cause discoloration, biofilm accumulation, and increased wear (1,19).…”

Effect of a Home Bleaching Agent on the Ion Elution of Different Esthetic Materials

“…Dissolution of dental ceramics is dependent on the chemical environment (acidic, neutral or alkaline), mechanical environment (loading) or their combination 18 . Chemical resistance is an important property because ceramics can undergo degradation in the presence of solutions with different pH values 19 …”

“…18 Chemical resistance is an important property because ceramics can undergo degradation in the presence of solutions with different pH values. 19 Acids, such as hydrochloric acid and acetic acid, are used to test the chemical stability of dental materials; ISO 6872 stipulates that acetic acid should be used in chemical stability tests. 15,17 Acids are an excellent testing medium compared to saliva or distilled water because they cause faster material dissolution, thus allowing assessment of the long-term stability of dental ceramics.…”