Nouf Al Hammad, Fouad S Salama.
Effect of home-use bleaching agents on Restorative materials.
J Pak Dent Assoc Jan ;14(4):191-4.

OBJECTIVE: The purpose of this in vitro investigation was to measure the effect of home-use bleaching agents on surface roughness of a glass ionomer (Fuji IX GP) and a compomer (F2000) restorative materials. METHODS: Forty-eight flat cylindrical specimens of each material were prepared using Teflon molds. Specimens of each material were divided into three groups of 8 each. Groups 1 and 2 served as controls (no bleaching agents). Groups 3 and 4 were treated with 3 applications of Pearl Drops on Fuji IX GP and F2000 respectively. Groups 5 and 6 were treated with 3 applications of Natural White on Fuji IX GP and F2000 respectively. Surface roughness (Ra value) was evaluated using a surface roughness analyzer. Statistical analysis was performed using a non-parametric one-way analysis of variance (Kruskal-Wallis test) with a Tukey`s post test. RESULTS: Results showed highly significant differences between the six groups (p<0.0001). Group 2 (F2000, control) demonstrated the lowest Ra value compared with all other groups (p<0.001). Group 5 (Natural White applied to Fuji IX GP) demonstrated the highest Ra value compared with all other groups (p<0.0001). F2000 was significantly smoother than Fuji IX GP for all treatments with p<0.0001. CONCLUSION: It was concluded that Fuji IX GP exhibited significantly higher surface roughness, in form of arithmetic mean value, than F2000 before and after application of Pearl Drops and Natural White home-use bleaching agents.

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