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Eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure

BACKGROUND: The aim of this study was evaluated the eroded enamel rehardening potential using upper palatal and lower buccal removable appliances in different times of salivary exposure (30 min, 1h, 2h, 12h) after a single erosive challenge event. MATERIAL AND METHODS: After initial surface hardness...

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Autores principales: Mendonça, Fernanda-Lyrio, Jordão, Maisa-Camillo, Val, Poliana-Pacífico, de Alencar, Catarina-Ribeiro-Barros, Bassoto, Marcela-de Azevedo-Garcia, Honório, Heitor-Marques, Magalhães, Ana-Carolina, Buzalaf, Marília-Afonso-Rabelo, da Silva, Thiago-Cruvinel, Rios, Daniela
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Medicina Oral S.L. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6894912/
https://www.ncbi.nlm.nih.gov/pubmed/31824592
http://dx.doi.org/10.4317/jced.56222
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author Mendonça, Fernanda-Lyrio
Jordão, Maisa-Camillo
Val, Poliana-Pacífico
de Alencar, Catarina-Ribeiro-Barros
Bassoto, Marcela-de Azevedo-Garcia
Honório, Heitor-Marques
Magalhães, Ana-Carolina
Buzalaf, Marília-Afonso-Rabelo
da Silva, Thiago-Cruvinel
Rios, Daniela
author_facet Mendonça, Fernanda-Lyrio
Jordão, Maisa-Camillo
Val, Poliana-Pacífico
de Alencar, Catarina-Ribeiro-Barros
Bassoto, Marcela-de Azevedo-Garcia
Honório, Heitor-Marques
Magalhães, Ana-Carolina
Buzalaf, Marília-Afonso-Rabelo
da Silva, Thiago-Cruvinel
Rios, Daniela
author_sort Mendonça, Fernanda-Lyrio
collection PubMed
description BACKGROUND: The aim of this study was evaluated the eroded enamel rehardening potential using upper palatal and lower buccal removable appliances in different times of salivary exposure (30 min, 1h, 2h, 12h) after a single erosive challenge event. MATERIAL AND METHODS: After initial surface hardness evaluation, bovine enamel blocks were eroded in vitro (0.01 M hydrochloric acid, pH 2.3, 30 seconds), selected (n = 160) and randomly assigned to the two appliance designs and twenty volunteers. Four enamel blocks were inserted in each removable appliance. On the in situ phase, the volunteers were instructed to use the upper palatal and lower buccal appliances simultaneously for 12 nonconsecutive hours. After each predetermined period of time of salivary exposure, the enamel blocks were removed from the appliances for immediate evaluation of surface hardness, enabling percentage of surface hardness recovery calculation (%SHR). The data were analyzed using two-way ANOVA and Tukey’s test (α=5%). RESULTS: The results showed no difference in the degree of enamel rehardening by the upper palatal or lower buccal appliances (p >0.0001). Regarding the time of use of the appliances, it was demonstrated that 30 minutes (upper = 21.12%, lower = 19.84%) and 1 hour (upper = 35.69%, lower = 30.50%) promoted lower hardness recovery than two hours (upper = 44.65%, lower 40.80%) of salivary exposure (p<0.0001). The use of 12 hours (upper = 49.33%, lower = 49.00%), including the sleeping time of the volunteers did not increase the %SHR. CONCLUSIONS: The location of the appliance does not influence the re-hardening ability of saliva and the use of intraoral appliances for 2 hours seems to be appropriate for partial rehardening of the softened enamel surface. Key words:Tooth erosion, in situ, saliva, tooth remineralization.
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spelling pubmed-68949122019-12-10 Eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure Mendonça, Fernanda-Lyrio Jordão, Maisa-Camillo Val, Poliana-Pacífico de Alencar, Catarina-Ribeiro-Barros Bassoto, Marcela-de Azevedo-Garcia Honório, Heitor-Marques Magalhães, Ana-Carolina Buzalaf, Marília-Afonso-Rabelo da Silva, Thiago-Cruvinel Rios, Daniela J Clin Exp Dent Research BACKGROUND: The aim of this study was evaluated the eroded enamel rehardening potential using upper palatal and lower buccal removable appliances in different times of salivary exposure (30 min, 1h, 2h, 12h) after a single erosive challenge event. MATERIAL AND METHODS: After initial surface hardness evaluation, bovine enamel blocks were eroded in vitro (0.01 M hydrochloric acid, pH 2.3, 30 seconds), selected (n = 160) and randomly assigned to the two appliance designs and twenty volunteers. Four enamel blocks were inserted in each removable appliance. On the in situ phase, the volunteers were instructed to use the upper palatal and lower buccal appliances simultaneously for 12 nonconsecutive hours. After each predetermined period of time of salivary exposure, the enamel blocks were removed from the appliances for immediate evaluation of surface hardness, enabling percentage of surface hardness recovery calculation (%SHR). The data were analyzed using two-way ANOVA and Tukey’s test (α=5%). RESULTS: The results showed no difference in the degree of enamel rehardening by the upper palatal or lower buccal appliances (p >0.0001). Regarding the time of use of the appliances, it was demonstrated that 30 minutes (upper = 21.12%, lower = 19.84%) and 1 hour (upper = 35.69%, lower = 30.50%) promoted lower hardness recovery than two hours (upper = 44.65%, lower 40.80%) of salivary exposure (p<0.0001). The use of 12 hours (upper = 49.33%, lower = 49.00%), including the sleeping time of the volunteers did not increase the %SHR. CONCLUSIONS: The location of the appliance does not influence the re-hardening ability of saliva and the use of intraoral appliances for 2 hours seems to be appropriate for partial rehardening of the softened enamel surface. Key words:Tooth erosion, in situ, saliva, tooth remineralization. Medicina Oral S.L. 2019-12-01 /pmc/articles/PMC6894912/ /pubmed/31824592 http://dx.doi.org/10.4317/jced.56222 Text en Copyright: © 2019 Medicina Oral S.L. http://creativecommons.org/licenses/by/2.5/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Mendonça, Fernanda-Lyrio
Jordão, Maisa-Camillo
Val, Poliana-Pacífico
de Alencar, Catarina-Ribeiro-Barros
Bassoto, Marcela-de Azevedo-Garcia
Honório, Heitor-Marques
Magalhães, Ana-Carolina
Buzalaf, Marília-Afonso-Rabelo
da Silva, Thiago-Cruvinel
Rios, Daniela
Eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure
title Eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure
title_full Eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure
title_fullStr Eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure
title_full_unstemmed Eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure
title_short Eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure
title_sort eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6894912/
https://www.ncbi.nlm.nih.gov/pubmed/31824592
http://dx.doi.org/10.4317/jced.56222
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