Evaluation of pH Levels and Surface Roughness After Bleaching and Abrasion Tests of Eight Commercial Products

Author(s)

Trentino, Ana Carolina ^[1] ; Soares, Ana Flavia ^[1] ; Hungaro Duarte, Marco Antonio ^[1] ; Ishikiriama, Sergio Kiyoshi ^[1] ; Lia Mondelli, Rafael Francisco ^[1]

Affiliation

^[1] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Sao Paulo - Brazil

• Document type: Journal article
• Source: Photomedicine and Laser Surgery; v. 33, n. 7, p. 372-377, JUL 1 2015.
• Web of Science Citations: 5

Abstract

Objective: This in vitro study evaluated the effect of different bleaching protocols and the variation of pH levels of bleaching gels regarding roughness and wear of bovine enamel, after in-office bleaching protocols and brushing. Materials and methods: Ninety fragments were randomly divided into nine groups: C, control; WHP15, 35% hydrogen peroxide (HP) (Whiteness HP, FGM) three gel applications of 15min each, three sessions with 1 week intervals; WHP45, 35% HP (Whiteness HP) one application/45min, three sessions with 1 week intervals; LPS, 35% HP (Lase Peroxide, DMC) plus hybrid light (HL) {[}light-emitting diode (LED)/diode laser], four applications/7min 30sec (6min of HL activation), one session; LPSII, 25% HP (Lase Peroxide II, DMC) plus HL, four applications/7min 30sec (6min of HL activation), one session; LPL, 15% HP (Lase Peroxide Light, DMC) four applications/7min 30sec (6min of HL activation), one session; WO, 35% HP (Whitegold Office, Dentsply) three applications/15min, three sessions with 1 week intervals; WBC40, 35% HP (Whiteness HP Blue Calcium, FGM) one application/40min, three sessions with 1 week intervals; and WBC50, 20% HP (Whiteness HP Blue Calcium) one application/50min, three sessions with 1 week intervals. The median pH values were determined utilizing a pH meter during the initial and final gel applications. A rugosimeter was utilized to evaluate the surface roughness (R-a) before and after bleaching and brushing (100,000 strokes), and the surface wear after brushing. Results: For the results of the pH values, there was a decrease in the pH levels from the initial to the final bleaching time, except for the WBC50. The WO and WBC40 groups exhibited higher pH values. For the results of roughness and wear, there was an increase in surface roughness and wear among the groups. Conclusions: The pH values tended to decrease from the initial to the final bleaching. After tooth brushing, bleaching procedures with lower pH products provided a significant increase in enamel wear and surface roughness. (AU)

• FAPESP's process: 09/04574-6 - An In vitro study of variation of pH bleaching agents, wear and surface roughness of bovine enamel submitted to simulated brushing.
• Grantee: Ana Carolina Trentino
• Support Opportunities: Scholarships in Brazil - Master