Caracterização superficial e desempenho de resinas convencionais e CAD/CAM com diferentes técnicas de polimento frente ao desafio erosivo/abrasivo
Carregando...
Arquivos
Data
2022-03-31
Autores
Reis, Leticia Montouro
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
A prevalência de desgaste dentário erosivo (DDE) tem aumentado na população.
Embora não haja um consenso sobre o material mais adequado para restaurações
nestes casos, as resinas compostas (RC) têm sido frequentemente utilizadas. Os
avanços em RC têm propiciado seu uso em diversas situações e a literatura tem
indicado que a longevidade deste material em procedimentos diretos e indiretos é
similar. Entretanto, muitos fatores são determinantes para a longevidade das
restaurações com RC, entre eles a lisura superficial obtida com acabamento e
polimento. Além disso, o desafio ácido constante nos casos de DDE pode degradar
e comprometer a longevidade das restaurações de RC. Diante disso, o objetivo
deste estudo in vitro é caracterizar superficialmente e avaliar o desempenho de
diferentes tipos de RC que receberam diferentes tipos de polimento frente a um
desafio erosivo/abrasivo. Serão obtidos 40 espécimes (Ø = 10mm, espessura =
2mm, n=20/material) de resinas compostas convencional (Grandio®SO) e para
CAD/CAM (Grandio blocs®). Os espécimes serão randomizados para receber
polimento com discos de lixa (Sof-Lex Pop On®) ou discos + polidor diamantando
(Dimanto®). As análises de topografia de superfície (Microscopia Eletrônica de
Varredura), rugosidade (rugosímetro de contato) e microdureza (microdurômetro
com endentador Vickers) serão conduzidas antes e após o desafio erosivo/abrasivo
com ácido cítrico a 0,3% (4 ciclos diários/5 dias) e escovação (2 ciclos diários/5
dias). Para cada teste, a análise estatística dos dados coletados, se houver
distribuição normal, será realizada com os testes de ANOVA a 2 fatores e Tukey
(p<0,05).
The prevalence of erosive tooth wear (EAD) has increased in the population. Although there is no consensus on the most suitable material for restorations in these cases, composite resins (CR) have been frequently used. The advances in CR have propitiated its use in several situations and the literature has indicated that the longevity of this material in direct and indirect procedures is similar. However, many factors are determining the longevity of CR restorations, among them the surface smoothness achieved with finishing and polishing. Moreover, the constant acid challenge in DDE cases can degrade and compromise the longevity of CR restorations. Given this, the aim of this in vitro study is to superficially characterize and evaluate the performance of different types of CR that received different types of polishing facing an erosive/abrasive challenge. Forty specimens (Ø = 10 mm, thickness = 2 mm, n=20/material) of conventional (Grandio®SO) and CAD/CAM (Grandio blocs®) composite resins will be obtained. Specimens will be randomized to receive polishing with grinding discs (Sof-Lex Pop On®) or discs + diamond polisher (Dimanto®). Analyses of surface topography (Scanning Electron Microscopy), roughness (contact roughness meter) and microhardness (microdurometer with Vickers endenter) will be conducted before and after erosive/abrasive challenge with 0.3% citric acid (4 cycles daily/5 days) and brushing (2 cycles daily/5 days). For each test, the statistical analysis of the data collected, if there is normal distribution, will be performed with the ANOVA 2-factor and Tukey (p<0,05).
The prevalence of erosive tooth wear (EAD) has increased in the population. Although there is no consensus on the most suitable material for restorations in these cases, composite resins (CR) have been frequently used. The advances in CR have propitiated its use in several situations and the literature has indicated that the longevity of this material in direct and indirect procedures is similar. However, many factors are determining the longevity of CR restorations, among them the surface smoothness achieved with finishing and polishing. Moreover, the constant acid challenge in DDE cases can degrade and compromise the longevity of CR restorations. Given this, the aim of this in vitro study is to superficially characterize and evaluate the performance of different types of CR that received different types of polishing facing an erosive/abrasive challenge. Forty specimens (Ø = 10 mm, thickness = 2 mm, n=20/material) of conventional (Grandio®SO) and CAD/CAM (Grandio blocs®) composite resins will be obtained. Specimens will be randomized to receive polishing with grinding discs (Sof-Lex Pop On®) or discs + diamond polisher (Dimanto®). Analyses of surface topography (Scanning Electron Microscopy), roughness (contact roughness meter) and microhardness (microdurometer with Vickers endenter) will be conducted before and after erosive/abrasive challenge with 0.3% citric acid (4 cycles daily/5 days) and brushing (2 cycles daily/5 days). For each test, the statistical analysis of the data collected, if there is normal distribution, will be performed with the ANOVA 2-factor and Tukey (p<0,05).
Descrição
Palavras-chave
Desenho assistido por computador, Resinas compostas, Erosão dentária, Computer-aided design, Composite resins, Tooth erosion