Sandra Chiga1, Carmen Victoria Torres Toro1, Taísa Penazzo Lepri1, Cecília Petroso Turssi2, Vivian Colucci1, Silmara Aparecida Milori Corona3. 1. University of São Paulo, School of Dentistry of Ribeirão Preto-USP, Department of Restorative Dentistry, Ribeirão Preto, Av. do café, s/n, Monte Alegre, CEP:14040-904 São Paulo, Brazil. 2. São Leopoldo Mandic Institute and Dental Research Center, Department of Restorative Dentistry, Campinas, Rua Dr. José Rocha Junqueira, 13, Swift, CEP:13045-755 São Paulo, Brazil. 3. University of São Paulo, School of Dentistry of Ribeirão Preto-USP, Department of Restorative Dentistry, Ribeirão Preto, Av. do café, s/n, Monte Alegre, CEP:14040-904 São Paulo, Brazil. Electronic address: silmaracorona@forp.usp.br.
Abstract
OBJECTIVE: This study evaluated the combined effect of fluoride varnish to Er:YAG or Nd:YAG laser on permeability of eroded root dentine. DESIGN: Sixty slabs of bovine root dentine (2×2×2mm) were eroded with citric acid 0.3% (pH 3.2) during 2h and then kept in artificial saliva during 24h. Specimens were randomly assigned in 6 groups (n=10), to receive the following treatments: fluoride varnish; fluoride varnish+Er:YAG laser; fluoride varnish+Nd:YAG laser; non-fluoride varnish; non-fluoride varnish+Er:YAG laser; non-fluoride varnish+Nd:YAG laser. The Er:YAG (100mJ, 3Hz) and Nd:YAG (70mJ, 15Hz) were applied for 10s. Specimens were subjected to further erosive challenges with citric acid 0.3% 4×/day, during 1min, for 5 days, remaining in artificial saliva between cycles. Dentin permeability was then assessed. Two-way ANOVA demonstrated no significant interaction between laser and varnish (p=0.858). RESULTS: No effect was also detected for the main factor varnish (p=0.768), while permeability of eroded root dentin was significantly lower when such substrate was laser-irradiated, no matter the laser source (p<0.001). CONCLUSIONS: This study concluded that Er:YAG and Nd:YAG lasers can be employed to control the permeability of eroded root dentin, regardless of fluoride varnish application.
OBJECTIVE: This study evaluated the combined effect of fluoride varnish to Er:YAG or Nd:YAG laser on permeability of eroded root dentine. DESIGN: Sixty slabs of bovine root dentine (2×2×2mm) were eroded with citric acid 0.3% (pH 3.2) during 2h and then kept in artificial saliva during 24h. Specimens were randomly assigned in 6 groups (n=10), to receive the following treatments: fluoride varnish; fluoride varnish+Er:YAG laser; fluoride varnish+Nd:YAG laser; non-fluoride varnish; non-fluoride varnish+Er:YAG laser; non-fluoride varnish+Nd:YAG laser. The Er:YAG (100mJ, 3Hz) and Nd:YAG (70mJ, 15Hz) were applied for 10s. Specimens were subjected to further erosive challenges with citric acid 0.3% 4×/day, during 1min, for 5 days, remaining in artificial saliva between cycles. Dentin permeability was then assessed. Two-way ANOVA demonstrated no significant interaction between laser and varnish (p=0.858). RESULTS: No effect was also detected for the main factor varnish (p=0.768), while permeability of eroded root dentin was significantly lower when such substrate was laser-irradiated, no matter the laser source (p<0.001). CONCLUSIONS: This study concluded that Er:YAG and Nd:YAG lasers can be employed to control the permeability of eroded root dentin, regardless of fluoride varnish application.
Authors: Vivian Leite Martins; Rodrigo Vitoria da Costa Ramos; Max José Pimenta Lima; Roberto Paulo Correia de Araújo; Andrea Nóbrega Cavalcanti Journal: J Conserv Dent Date: 2018 Jan-Feb
Authors: Daísa L Pereira; Anderson Z Freitas; Luciano Bachmann; Carolina Benetti; Denise M Zezell; Patricia A Ana Journal: Int J Mol Sci Date: 2018-02-01 Impact factor: 5.923