Effect of Dental Pigmentation Intensity on the Transenamel and Transdentinal Penetration of Hydrogen Peroxide

Abstract

This study aimed to evaluate the transenamel and transdentinal penetration of hydrogen peroxide (H 2 0 2 ) applied to bovine teeth pigmented with black tea at different intensities. The following groups were formed DW: immersion in distilled water; BT100: immersion in an infusion of 1.6 g of black tea per 100 mL distilled water; BT10: immersion in an infusion of 1.6 g black tea per 10 mL distilled water. All groups were immersed for 6 days. To quantify the penetration of H 2 0 2 , the specimens were placed in artificial pulp chambers (APCs) and subjected to bleaching treatment with 38% H 2 O 2 once per week for 3 weeks. After bleaching treatment, the acetate buffer solution of APCs with peroxidase enzyme was evaluated in a reflection spectrophotometer. The transenamel and transdentinal penetration of H 2 O 2 and the L* values obtained at T1, T2 and T3 were subjected to Kruskal-Wallis and Friedman statistical tests. At T1, the H 2 O 2 diffusion in DW was higher than that in BT100 and BT10. At the other evaluation times, the penetration values in BT100 and BT10 increased and remained similar. The L* values increased significantly in all groups at T1. At T2, the L* values were higher in DW, while the values in BT100 and BT10 were similar to each other. At the end of the experiment, BT10 showed the lowest L* values. The pigmentation level did not affect the penetration of H 2 O 2 through the enamel and dentin and the bleaching agent effectively changed the color of the teeth.

Whitening effect of 35% hydrogen peroxide in simulation of tooth with orthodontic bracket

“…30 The initial color of the tooth is another factor that can also influence the final whitening result, so as the teeth of younger people generally experience less pigmentation throughout their life makes whitening easier compared to elderly individuals. 31 In an in vitro study, the ways of standardization of the specimens and quantitative analyzes of color and perception of whitening, the protocols of use, frequency and time of the products, and the temperature of storage of the specimens throughout the experiment can be well controlled. However, the oral dynamics and oral hygiene habits among users are very diverse.…”

“…In addition, the diffusion capacity may be related to the patient's age, where the deposition of secondary dentin occurs throughout life, causing the thickness of this dentin to increase and consequently the efficiency and penetration of hydrogen peroxide to decrease 30 . The initial color of the tooth is another factor that can also influence the final whitening result, so as the teeth of younger people generally experience less pigmentation throughout their life makes whitening easier compared to elderly individuals 31 …”

Clinical and morphological characteristics of enamel during pigment hypoplasia of tooth tissues.

“…Грунтуючись на морфогенетичних особливостях будови емалі, ширини емалевих прошарків Moreira J.C. та інш. висловлюють припущення про ефективність відбілювання зубів з використанням пероксидів [12,13].…”