Bleaching agents may change surface micro-morphology of enamel, Finds study
It has been recently noted that bleaching with 38% Hydrogen Peroxide (HP) and 16% Carbamide Peroxide (CP) resulted in mild changes in surface micro-morphology of enamel, according to a study published in the Journal of College of Physicians And Surgeons Pakistan.
Bleaching treatment is in high demand by patients, and it is considered as part of most esthetic dental treatments. Despite the tooth whitening esthetic benefits, some side-effects have been reported, including Tooth sensitivity and structural changes such as microhardness (MH) reduction and increased roughness. Nevertheless, there is little information in the literature evaluating the effect of home-use bleaching agents containing 16% Carbamide Peroxide (CP) and in-office bleaching agent with 38% Hydrogen Peroxide (HP) on surface micro-morphology of enamel.
Hence, Nazish Fatima from the Ziauddin University conducted the present study to assess the efficacy of home bleaching agents. The author set up an experimental study on forty- five-sound human third molar crowns, all of which were extracted for periodontal reasons.
The discs were prepared at Material Engineering Department of NED University of Engineering and Technology, Karachi, and surface morphology was analyzed at Centralized Science Laboratory of Karachi University, Pakistan. Longitudinal sections were made using diamond disks (0.2 mm) underwater lubrication to obtain enamel slabs measuring (3 mm x 3 mm).
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