Application Tip and Concentration of a Self-mixing Bleach: Hydrogen Peroxide Inside the Pulp Chamber, Color Change, and Amount of Bleaching Gel Used.

Autor:	Carneiro TS; Taynara S Carneiro, DDDS, MSc, PhD student, Department of Stomatology, IDIBO research group, Health Sciences Faculty, Rey Juan Carlos University, Alcorcón, Madrid, Spain., Favoreto MW; Michael W Favoreto, DDS, MSc, PhD student, Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, PR, Brazil., Bernardi LG; Lais G Bernardi, DDS, MSc, PhD student, Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, PR, Brazil., Bandeca MC; Matheus C Bandeca, DDS, MS, PhD, Department of Restorative Dentistry, School of Dentistry, CEUMA University, São Luís, MA, Brazil., Borges C; Christiane PF Borges, BSc, PhD, Department of Chemistry, State University of Ponta Grossa, PR, Brazil., Reis A; Alessandra Reis, DDS, PhD, Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, PR, Brazil., Loguercio AD; Alessandro D Loguercio, DDS, MSc, PhD, Department of Restorative Dentistry, School of Dentistry State University of Ponta Grossa, PR, Brazil.
Jazyk:	angličtina
Zdroj:	Operative dentistry [Oper Dent] 2023 Mar 01; Vol. 48 (2), pp. 146-154.
DOI:	10.2341/21-053-L
Abstrakt:	Purpose: The objective of this study was to evaluate if the application method (tip with brush or tip without brush) and hydrogen peroxide (HP) concentration (6% or 35% self-mixing) of in-office bleaching gel influences the penetration of HP into the pulp chamber, color change, and the amount of bleaching gel used. Methods: Forty healthy premolars were randomly divided into the following five groups (n=8): no treatment; HP6% using a tip with a brush, HP6% using a tip without a brush, HP35% using a tip with a brush, and HP35% using a tip without a brush. After treatments, the HP concentration (μg/mL) within the pulp chamber was determined using UV-Vis spectrophotometry. The color change (ΔEab, ΔE00, and ΔWID) was evaluated using a digital spectrophotometer. The amount of gel used (g) in each group was measured using a precision analytical balance. Data from each test were submitted to parametric tests (α=0.05). Results: The tip with a brush resulted in a lower amount of HP inside the pulp chamber and less gel used when compared with the tip without a brush, regardless of HP concentration (p<0.05). However, regarding the tip used, although no significant difference was observed when HP35% was used (p>0.05), a higher whitening effect was observed when the 6% HP was applied without a brush as opposed to with a tip brush (p<0.05). Conclusions: The use of a tip with a brush, regardless of the in-office bleaching gel concentration (6% or 35% self-mixing), presented a lower penetration and lower volume of spent gel when compared to a tip without brush. However, the whitening effect depended on the concentration of HP used. (© Operative Dentistry, 2023.)
Databáze:	MEDLINE
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