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Background  To investigate the effect of transparent tray-based application of bioactive glasses (BGs) desensitizer on the permeability of enamel and dentin to hydrogen peroxide (H 2 O 2 ).    Methods  Freshly extracted human first premolars were divided into 6 groups ( n  = 8). Group A and B: without pretreatments; Group C and E: treated with BGs desensitizer only; Group D and F: treated with BGs desensitizer dispensed with a transparent tray. After roots and pulp tissues of the treated tooth specimens were thoroughly removed, acetate buffer was added into pulp chambers and the treated specimens were immersed in distilled water (Groups A, E, and F) or 30% H 2 O 2  (Groups B, C, and D) for 30 min at 37 °C. The amount of H 2 O 2  in the pulp chamber of each group was measured using ultraviolet-visible spectrophotometry.    Results  In control groups (Group A, E, and F), H 2 O 2  was not detected. The amount of pulpal H 2 O 2  in Group B, C, and D were 21.149 ± 0.489 μg, 9.813 ± 0.426 μg, and 4.065 ± 0.268 μg respectively. One-way ANOVA analysis indicated that significant differences existed in these groups (F = 459.748,  p  < 0.05).    Conclusions  The effect of BGs desensitizer in reducing the permeability of enamel and dentin to H 2 O 2  could be enhanced when dispensed with a transparent tray.

bmc oral health

Impact of transparent tray-based application of bioactive glasses desensitizer on the permeability of enamel and dentin to hydrogen peroxide: an in vitro study