A comparative study evaluates the effect of Hydrogen peroxide 38% and Carbamide peroxide 35% bleaching products on enamel microhardness (In vitro study)

Abstract

The aim of this study was to compare the effect of two professional bleaching
products (in-office Opalescence Boost hydrogen peroxide 38%) and (home bleaching
Opalescence carbamide peroxide 35%) on enamel microhardness.
The sample consist of thirty maxillary first premolars teeth (freshly extracted),
caries free obtained from children aged 12 years old under routine orthodontic
treatment. The teeth were sectioned mesiodistally parallel to the long axis of tooth and
mounted on acrylic mold. The specimens were divided into two halves buccal and
palatal as per treatment, the buccal half served as experimental, while the palatal half
served as control (1) and kept in artificial saliva at 37c0 for two weeks. Microhardness
test were obtained before and after bleaching.
Results indicated that teeth specimens submitted to Opalescence carbamide
peroxide 35% showed highly significant reduction in enamel microhardness P<0.01,
while no-significant difference in enamel microhardness in specimens submitted to
Opalescence Boost 38% hydrogen peroxide P>0.05.
In this study Opalescence carbamide peroxide 35% leads to the significant
decrease in enamel microhardness compared to Opalescence Boost hydrogen
peroxide 38%.