Effects of pH and application technique of in-office bleaching gels on hydrogen peroxide penetration into the pulp chamber
| dc.contributor.author | Balladares, Luis | |
| dc.contributor.author | Alegría Acevedo, Luisa | |
| dc.contributor.author | Montenegro, Andres | |
| dc.contributor.author | Arana Gordillo, Luis Alfonso | |
| dc.contributor.author | Pulido, Camilo A | |
| dc.contributor.author | Salazar Gracez, María Teresa | |
| dc.contributor.author | Reis, Alessandra | |
| dc.contributor.author | Loguercio, Alessandro D | |
| dc.date.accessioned | 2020-02-10T01:03:30Z | |
| dc.date.available | 2020-02-10T01:03:30Z | |
| dc.date.issued | 2019-11-13 | |
| dc.description.abstract | Objective: This in vitro study aimed to quantify the penetration of hydrogen peroxide (HP) into the pulp chamber in teeth submitted to in-office bleaching with varied pH and application techniques. The color change and pH of the in-office bleaching product during application was also evaluated. Methods and Materials: Ninety-six human premolars were used and randomly divided into 10 groups (n=9) according to the following combination of factors: pH of in-office bleaching agents (two neutral/alkaline pH: Opalescence Boost 38% and Whiteness HP Blue 35% and three acidic pH: Whiteness HP Maxx 35%, Lase Peroxide Sensy 35%, and Total Blanc Office 35%) and application modes (for 3 × 15 minutes [3×15] and 1 × 45 minutes [1×45]). An additional group of non-bleached teeth (control; n=6) was added. First, all teeth were sectioned 3 mm from the cementoenamel junction and the pulp tissue was removed. An acetate buffer was placed in the pulp chamber of all teeth. After bleaching, this solution was transferred to a glass tube in which HP was allowed to react with other components, resulting in a pink solution. The optical density of this pink solution was measured using ultraviolet-visible spectroscopy and converted into amount of HP. Color change before and 1 week after bleaching was evaluated using a digital spectrophotometer. A pH meter with a 6-mm circular and flat surface was used in contact with the enamel surface to quantify the pH of the bleaching gels during application. Data were analyzed using two-way analysis of variance and Tukey tests (α=0.05). Results: Overall, lower mean HP penetration values were observed for Opalescence Boost 38% and Whiteness HP Blue 35% compared with other bleaching gels (p<0.05). Opalescence Boost 38% and Whiteness HP Blue 35% were not influenced by the application technique (p>0.05). However, lower mean HP penetration values were observed for Whiteness HP Maxx 35%, Total Blanc Office 35%, and Lase Peroxide Sensy 35% when using the 3×15 application technique compared with the 1×45 technique (p<0.05). Significant whitening was detected and no significant difference of color change was observed between groups (p>0.54). The pH did not change during the 3×15 application technique; however, all acidic bleaching gels significantly decreased in pH when applied for 1×45 (p<0.01). Conclusions: The amount of HP that reaches the pulp chamber was lower when neutral/alkaline pH gels were used, independently of the application technique. When considering acidic pH gels, it is preferable to use the 3×15 application technique, mainly because longer application time (1×45) results in lower pH. No difference was observed between groups | es |
| dc.identifier.issn | 1559-2863 | |
| dc.identifier.uri | https://repositorio.usc.edu.co/handle/20.500.12421/2694 | |
| dc.language.iso | en | es |
| dc.publisher | Indiana University School of Dentistry | es |
| dc.subject | Hydrogen peroxide | es |
| dc.subject | Tooth bleaching agent | es |
| dc.subject | Dental Pulp Cavity | es |
| dc.subject | Gels | es |
| dc.subject | Hydrogen Peroxide | es |
| dc.title | Effects of pH and application technique of in-office bleaching gels on hydrogen peroxide penetration into the pulp chamber | es |
| dc.type | Article | es |
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