RANDOMISED CLINICAL TRIAL TO COMPARE THE EFFICACY OF DENTAL WHITENING WITH 37.5% HYDROGEN PEROXIDE GEL AND 6% HYDROGEN PEROXIDE WHITENING STRIPS.: clinical study to compare the efficacy of dental whitening with 6% hydrogen peroxide whitening strips

• Published in: Journal of dentistry 2025-01, p.105589
• Main Authors: Gómez-Polo, Cristina, Lobato, Maria, Casado, Ana María Martín, Jiménez, Eduardo González, Muñoz, Maria Portillo
• Format: Article
• Language: English
• ISSN: 1879-176X; 1879-176X
• DOI: 10.1016/j.jdent.2025.105589

to evaluate the efficacy and chromatic stability after 4weeks, in all three thirds of the central incisor of two whitening treatments: in-office 37.5% hydrogen peroxide (HP) treatment alone, and 37.5% in-office HP followed by use of 6% HP whitening strips (WS).OBJECTIVEto evaluate the efficacy and chromatic stability after 4weeks, in all three thirds of the central incisor of two whitening treatments: in-office 37.5% hydrogen peroxide (HP) treatment alone, and 37.5% in-office HP followed by use of 6% HP whitening strips (WS).60 participants were randomly divided into two groups of 30. Group 1 was treated solely with in-office 37.5% HP. Group 2 followed the same in-office 37.5% HP protocol, followed by WS over 2 weeks. The CIELAB colour were measured before and after every treatment stage. Colour differences were quantified and compared to the perceptibility thresholds.METHODS60 participants were randomly divided into two groups of 30. Group 1 was treated solely with in-office 37.5% HP. Group 2 followed the same in-office 37.5% HP protocol, followed by WS over 2 weeks. The CIELAB colour were measured before and after every treatment stage. Colour differences were quantified and compared to the perceptibility thresholds.In-office 37.5% HP treatment created a statistically significant increase in the L* coordinate and a statistically significant decrease in the a* and b* coordinates, resulting in perceptible colour changes in over 80% of participants in all thirds of the tooth. In the group that used WS, the increase in L* and the decrease in a* and b* were maintained in the cervical and middle thirds after 4 weeks, whereas only the decrease in b* was maintained in the incisal third. In the group that did not use WS, the decrease in a* and b* was maintained in all thirds of the tooth after 4 weeks, but the increase in lightness was lost.RESULTSIn-office 37.5% HP treatment created a statistically significant increase in the L* coordinate and a statistically significant decrease in the a* and b* coordinates, resulting in perceptible colour changes in over 80% of participants in all thirds of the tooth. In the group that used WS, the increase in L* and the decrease in a* and b* were maintained in the cervical and middle thirds after 4 weeks, whereas only the decrease in b* was maintained in the incisal third. In the group that did not use WS, the decrease in a* and b* was maintained in all thirds of the tooth after 4 weeks, but the increase in lightness was lost