Efeito de diferentes protocolos de clareamento de consultório associados à luz violeta na eficácia e no aumento da temperatura pulpar

• Ano de defesa: 2019
• Autor(a) principal: Cargnin, Brunna Katyuscia de Almeida Guanaes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Positivo; Brasil; Pós-Graduação; Programa de Pós-Graduação em Odontologia Clínica; UP
• Palavras-chave em Português: Odontologia; Clareamento dental; Peróxido de hidrogênio; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: https://repositorio.cruzeirodosul.edu.br/handle/123456789/2115

The objectives of this study were: i) to evaluate the efficacy of different in-office bleaching protocols associated with LED violet light; and II) to evaluate the pulpal temperature rise during in-office bleaching associated with LED violet light with and without application of the bleaching gel. Forty bovine incisors distributed in 4 groups (n = 10), according to the bleaching protocol: VL-violet light (Bright Max Whitening, MMO); HP – hydrogen peroxide 35% (Whiteness HP Automixx, FGM); HYB – hybrid protocol, peroxide and violet light (violet light applied in half of cycles); and HPVL – peroxide and violet light (light applied in all cycles). The evaluation of the bleaching efficacy was performed using the parameters ΔEab, ΔE00 and ΔWID. Data were collected at the following times: initial (pre-bleaching), 7, 14, 21 and 60 days after the first bleaching application. To evaluate the pulpal temperature, three human incisors had their dental pulps removed and type K thermocouples were placed inside the pulp chamber. The teeth were irradiated with the LED violet light for 30 min (20 cycles of 60 s, with a pause of 30 s between cycles). The analysis of pulpal temperature determination was performed without and with the application of the bleaching gel. The color change data for the various parameters evaluated were statistically analyzed by two-way ANOVA with repeated measures and Tukey's test. The data of pulpal temperature and temperature variation without and with the application of the bleaching gel were analyzed by Student's t test (α=5%). For the group with application of violet light without gel, the ΔEab values were lower in relation to the other groups, showing low efficacy (2.3 ± 0.3). For ΔWID, HP, HYB and HPVL were similar at 7 and 60 days. At 7 days, comparing the protocols with violet light and gel, HPVL presented higher ΔEab and ΔE00 values than HYB. For this initial time, comparing to the control group (HP, gel only), ΔEab was similar for control and HYB, but ΔE00 was statistically higher for the control when compared to HYB. At 60 days, HPVL presented higher ΔEab and ΔE00 values than HYB. The control group (HP) showed intermediate values and similar to HPVL and HYB. Moderate to strong positive correlations were observed between ΔEab and ΔE00 (R = 0.988), ΔEab and ΔWID (R = 0.662) and ΔE00 and ΔWID (R = 0.589). Considering the average temperature, there were significant differences comparing with gel (45.7o C ± 2.4) and without gel application (44.5o C ± 1.5), as well as for ΔT: with gel (8.9o C ± 2.2) and without gel (7.2o C ± 1.2). It can be concluded that, among the protocols with violet light, the one with the use of light in all cycles (HPVL) was more effective than the hybrid protocol, with light in half of the cycles. The two protocols with violet light showed similar results to the control group (hydrogen peroxide only). The groups with gel application had higher absolute temperature and higher temperature variation in relation to the no gel group.