Revista de Odontologia da UNESP
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Revista de Odontologia da UNESP
Original Article

Sealing ability of different adhesive restorative materials

Habilidade de selamento de differentes materiais restauradores adesivos

LUND, Rafael Guerra Lund; CARVALHO, Rodrigo Varella de Carvalho; RODRIGUES-JUNIOR, Sinval Adalberto Rodrigues Junior; Demarco, F.F.

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Abstract

The purpose of this study was to evaluate the sealing ability of different
adhesive restorative materials to bovine enamel and dentin. Ninety standard sauceshaped Class V cavities with 3 mm of diameter x 2 mm of depth were prepared in the uccal and lingual faces of 45 bovine incisors. The gingival margin was located in
dentin and the incisal margin in enamel. Teeth were randomly divided in 9 groups
(n=10) and restored with the following materials: five flowable composites, one
microfilled composite, one microhybrid composite, one compomer; and one resinmodified lass ionomer cement (RMGIC). The restorations were made based on the manufacturer’s instructions for adhesive treatment and restorative procedure. After
polishing, the teeth were thermocycled and immersed in 2% basic fuchsin for 24h.
Teeth were, then, serially sectioned generating 3 slices of 1 mm that were observed in a stereomicroscope under x40 magnification. The degree of dye leakage was recorded as follows: 0 – no leakage; 1 – leakage up to half the cavity; 2 – leakage in more than half of the cavity; 3 – Extensive dye leakage, reaching the deepest portion of the cavity. Data was statistically analyzed using Kruskal-Wallis non-parametric test complemented with Bonferroni's test when the difference between means was significant (α=0,05).
Extensive dye leakage was observed in dentin margins. The results were statistically
higher than in enamel margins (Mann–Whitney U test (p<0.001)). Compomer
restorations produced the highest marginal sealing in dentin, differing from all other
groups. The highest degree of dye leakage in enamel was produced by the microfilled
composite. The majority of the materials exhibited leakage-free margins in up to 70% of the specimens. Both, materials and substrate significantly influenced the sealing ability.

Keywords

Compomer, composite resin, microkeakage, resin modified glass ionomer cement

Resumo

O objetivo deste estudo foi avaliar o selamento marginal de materiais
restauradores adesivos diferentes ao esmalte e à dentina bovina. Noventa cavidades
Classe V, padronizadas na forma de pires, com 3 mm de diâmetro x 2 mm de
profundidade foram preparadas nas superficies vestibular e palatina de 45 incisivos
bovinos, com margem gengival localizada em dentina e margem incisal em esmalte. Os dentes foram aleatoriamente divididos em 9 grupos (n=10) e restaurados com os
seguintes materiais: cinco resinas flow, uma resina composta microparticulada, uma
resina composta microhíbrida, um compômero e um CIVMR. As restaurações foram
confeccionadas com base nas instruções dos fabricantes para tratamento adesivo e
procedimento restaurador. Depois do polimento, os dentes foram termociclados e
imersos em fucsina básica a 2% por 24h. Os dentes foram seccionados seriadamente
gerando 3 fatias de 1 mm que foram observadas em estereomicroscópio sob
magnificação de 40x. O grau de penetração do corante foi registrado conforme segue: 0 – sem infiltração; 1 – infiltração atingindo metade da cavidade; 2 – infiltração em mais da metade da cavidade; 3 – infiltração extensa, atingindo a porção mais profunda da cavidade. Os dados foram submetidos ao teste não paramétrico de Kruskal-Wallis complementado com o teste de Bonferroni quando a diferença entre as médias foi significante (α=0,05). Infiltração extensa foi observada nas margens dentinárias. Os esultados foram estatisticamente superiores aos produzidos em margens em esmalte Mann–Whitney U (p<0,001)). Restaurações de compômero produziram o maior elamento marginal em dentina, diferindo de todos os outros grupos. O maior grau de nfiltração do corante em esmalte foi produzido pela resina composta microparticulada.
A maioria dos materiais apresentou margens livres de infiltração em até 70% dos
espécimes. Ambos, materiais e substratos influenciaram significativamente no selamento das restaurações.

Palavras-chave

Compômero, resina composta, microinfiltração, cimento de ionômero de vidro modificado por resina

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