The hardness and chemical changes in demineralized primary dentin treated by fluoride and glass ionomer cement

Introducao O fluoreto desempenha importante papel no controle da carie dental. Objetivo Avaliar as trocas quimicas entre cimentos de ionomero de vidro de alta viscosidade (CIV) e dentina decidua com aplicacao de fluoreto de sodio (NaF) a 2% em alteracoes de dureza dentinaria a partir da incorporacao de calcio, fosfato e fluoreto. Material e metodo Cavidades Classe I foram preparadas em 40 molares higidos divididos em 2 grupos (n=20), de acordo com a condicao dentinaria: higida (1) e desmineralizada (2). Subgrupos (n=10) foram formados para avaliar a acao isolada do CIV ou associado com NaF (F). Este estudo in vitro avaliou as trocas quimicas sob duas condicoes: dentina higida e desmineralizada (ciclagem de pH) para simular a perda mineral que ocorre em lesoes de carie. Grupo G1 e G2 receberam restauracoes de CIV; Grupos G1F e G2F receberam NaF antes do CIV. Os especimes foram preparados para microdureza Knoop e Micro-Raman. Para analise estatistica foi utilizada Anova 2 fatores (α = 0.05). Os dados do Micro-Raman foram descritos qualitativamente. Resultado O aumento de dureza foi observado em todos os sitios de contato direto com CIV, em ambas dentinas em todos os grupos (p 0.05). Na avaliacao do Micro-Raman, o contato direto do CIV/dentina tanto higida quanto desmineralizada resultou em um aumento do pico do fosfato dentinario. Conclusao As trocas quimicas entre o CIV e dentina desmineralizada podem induzir mudancas das propriedades mecânicas do substrato e a captacao de ions minerais (fosfato) ocorre sem a influencia do NaF.

[1]  T. Watson,et al.  Present and future of glass-ionomers and calcium-silicate cements as bioactive materials in dentistry: Biophotonics-based interfacial analyses in health and disease , 2014, Dental materials : official publication of the Academy of Dental Materials.

[2]  A. Reis,et al.  Evaluation of primary carious dentin after cavity sealing in deep lesions: a 10- to 13-month follow-up. , 2013, Pediatric dentistry.

[3]  D. Zero,et al.  In vitro caries lesion rehardening and enamel fluoride uptake from fluoride varnishes as a function of application mode. , 2013, American journal of dentistry.

[4]  J. Faber,et al.  Ion concentration adjacent to glass-ionomer restorations in primary molars. , 2012, Dental materials : official publication of the Academy of Dental Materials.

[5]  T. Watson,et al.  Microbiochemical Analysis of Carious Dentine Using Raman and Fluorescence Spectroscopy , 2012, Caries Research.

[6]  H. Ngo,et al.  An in vitro model for the study of chemical exchange between glass ionomer restorations and partially demineralized dentin using a minimally invasive restorative technique. , 2011, Journal of dentistry.

[7]  T. Watson,et al.  Effects of common dental materials used in preventive or operative dentistry on dentin permeability and remineralization. , 2011, Operative dentistry.

[8]  S. Sidhu.  Glass-ionomer cement restorative materials: a sticky subject? , 2011, Australian dental journal.

[9]  V. Monteiro-Neto,et al.  Partial caries removal in primary teeth: association of clinical parameters with microbiological status , 2011, BDJ.

[10]  F. B. Diniz,et al.  Chitosan effect on dental enamel de-remineralization: an in vitro evaluation. , 2010, Journal of dentistry.

[11]  S. Bhat,et al.  Effect of fluorides from various restorative materials on remineralization of adjacent tooth: an in vitro study. , 2010, Journal of the Indian Society of Pedodontics and Preventive Dentistry.

[12]  J. Nicholson.  Glass ionomer dental cements: update , 2010 .

[13]  D. Pashley,et al.  Failure of a Glass Ionomer to Remineralize Apatite-depleted Dentin , 2010, Journal of dental research.

[14]  J. Hebling,et al.  Artificial methods of dentine caries induction: A hardness and morphological comparative study. , 2009, Archives of oral biology.

[15]  J. Nör,et al.  Effect of adhesive restorations over incomplete dentin caries removal: 5-year follow-up study in primary teeth. , 2009, Journal of dentistry for children.

[16]  T. Watson,et al.  An in vitro investigation of the effectiveness of bioactive glass air-abrasion in the 'selective' removal of orthodontic resin adhesive. , 2008, European journal of oral sciences.

[17]  C. Bergmann,et al.  Analysis of primary tooth dentin after indirect pulp capping. , 2008, Journal of dentistry for children.

[18]  C Murali Krishna,et al.  Discrimination of normal and malignant mucosal tissues of the colon by Raman spectroscopy. , 2007, Photomedicine and laser surgery.

[19]  P. Spencer,et al.  Chemical profile of adhesive/caries-affected dentin interfaces using Raman microspectroscopy. , 2007, Journal of biomedical materials research. Part A.

[20]  M. Simionato,et al.  Ultrastructural and microbiological analysis of the dentin layers affected by caries lesions in primary molars treated by minimal intervention. , 2007, Pediatric dentistry.

[21]  H. Ngo,et al.  Chemical exchange between glass-ionomer restorations and residual carious dentine in permanent molars: an in vivo study. , 2006, Journal of dentistry.

[22]  R. Lynch,et al.  Low-levels of fluoride in plaque and saliva and their effects on the demineralisation and remineralisation of enamel; role of fluoride toothpastes. , 2004, International dental journal.

[23]  Nicky Kilpatrick,et al.  Correlating the mechanical properties to the mineral content of carious dentine--a comparative study using an ultra-micro indentation system (UMIS) and SEM-BSE signals. , 2004, Archives of oral biology.

[24]  M. Massara,et al.  Atraumatic Restorative Treatment: Clinical, Ultrastructural and Chemical Analysis , 2002, Caries Research.

[25]  J. M. ten Cate,et al.  Alternating demineralization and remineralization of artificial enamel lesions. , 1982, Caries research.