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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Does the hybrid light source (LED/laser) influence temperature variation on the enamel surface during 35% hydrogen peroxide bleaching? A randomized clinical trial

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Author(s):
de Freitas, Patricia Moreira [1] ; Menezes, Andressa Nery [1] ; Costa da Mota, Ana Carolina [1] ; Simoes, Alyne [2] ; Mendes, Fausto Medeiros [3] ; Neves Lago, Andrea Dias [4] ; Ferreira, Leila Soares [5] ; Ramos-Oliveira, Thayanne Monteiro [1]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Special Lab Lasers Dent, Dept Restorat Dent, Sch Dent, BR-05508000 Sao Paulo, SP - Brazil
[2] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, BR-05508000 Sao Paulo, SP - Brazil
[3] Univ Sao Paulo, Sch Dent, Dept Pediat Dent, BR-05508000 Sao Paulo, SP - Brazil
[4] Univ Maranhao, Ctr Biol Sci & Hlth, Sao Luis, MA - Brazil
[5] Ibirapuera Univ UNIB, Sch Dent, Biodent Master Program, Sao Paulo, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Quintessence International; v. 47, n. 1, p. 61-73, JAN 2016.
Web of Science Citations: 4
Abstract

Objective: The present study investigated how a hybrid light source (LED/laser) influences temperature variation on the enamel surfaces during 35% hydrogen peroxide (HP) bleaching. Effects on the whitening effectiveness and tooth sensitivity were analyzed. Method and Materials: Twenty-two volunteers were randomly assigned to two different treatments in a split-mouth experimental model: group 1 (control), 35% HP; group 2 (experimental), 35% HP + LED/laser. Color evaluation was performed before treatment, and 7 and 14 days after completion of bleaching, using a color shade scale. Tooth sensitivity was assessed using a visual analog scale (VAS; before, immediately, and 24 hours after bleaching). During the bleaching treatment, thermocouple channels positioned on the tooth surfaces recorded the temperature. Data on color and temperature changes were subjected to statistical analysis (a = 5%). Tooth sensitivity data were evaluated descriptively. Results: Groups 1 and 2 showed mean temperatures (+/- standard deviation) of 30.7 +/- 1.2 degrees C and 34.1 +/- 1.3 degrees C, respectively. It was found that there were statistically significant differences between the groups, with group 2 showing higher mean variation (P <.0001). The highest temperature variation occurred for group 2, with an increase of 5.3 degrees C at the enamel surface. The color change results showed no differences in bleaching between the two treatment groups (P =.177). The variation of the average temperature during the treatments was not statistically associated with color variation (P =.079). Immediately after bleaching, it was found that 36.4% of the subjects in group 2 had mild to moderate sensitivity. In group 1, 45.5% showed moderate sensitivity. In both groups, the sensitivity ceased within 24 hours. Conclusion: Hybrid light source (LED/laser) influences temperature variation on the enamel surface during 35% HP bleaching and is not related to greater tooth sensitivity. (AU)