Revista de Odontologia da UNESP
https://revodontolunesp.com.br/article/doi/10.1590/1807-2577.03616
Revista de Odontologia da UNESP
Original Article

Estudo comparativo in vitro da resistência ao desgaste entre o cimento de ionômero de vidro pó/líquido e o encapsulado

Comparative study in vitro wear resistance between powder/liquid glass ionomer cement and encapsulated

Lorena Sena Alves de SOUSA; Débora Michelle Gonçalves de AMORIM; Aion Mangino MESSIAS; Sergei Godeiro Fernandes Rabelo CALDAS; Marília Regalado GALVÃO

http://dx.doi.org/10.1590/1807-2577.03616 Rev. odontol. UNESP, vol.46, n1, p.51-55, 2017
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Resumo

Resumo: Introdução: Os cimentos de ionômero de vidro possuem limitações devido à sua baixa resistência mecânica, a qual está diretamente relacionada com a proporção pó/líquido e a sua manipulação. Com o intuito de padronizar o proporcionamento e a manipulação, surgiram os cimentos de ionômero de vidro encapsulados, os quais possuem proporção pré-estabelecida e manipulação mecânica.

Objetivo: Comparar, in vitro, a resistência ao desgaste entre os cimentos de ionômero de vidro pó/líquido (Riva self cure e Riva light cure) e os encapsulados (Riva self cure e Riva light cure).

Material e método: As amostras foram divididas em quatro grupos, tendo sido confeccionados 48 corpos de prova (n=12), sendo 12 para cada grupo, com as seguintes dimensões: 7 mm de diâmetro e 4 mm de espessura. O desgaste foi avaliado de acordo com a massa perdida no processo de escovação (10.000 ciclos). Os valores obtidos na diferença entre a massa inicial e a massa final foram submetidos à análise de variância ANOVA e Teste de Tamhane (p<0,05).

Resultado: Segundo os resultados obtidos, todas as amostras sofreram perda de massa estatisticamente significativa e, em ordem crescente de desgaste, temos os cimentos de ionômero de vidro modificado por resina ‒ para os quais não houve diferença significativa entre o sistema pó/líquido (ΔM=11,62 mg e p=0,001) e o encapsulado (ΔM=12,96 mg e p=0,003) (p>0,05) ‒ seguidos pelo convencional pó/líquido (ΔM=20,68 mg e p=0,014) e o convencional encapsulado (ΔM=47,95 mg e p=0,002).

Conclusão: Pode-se conseguir uma resistência ao desgaste semelhante e até melhor no sistema pó/líquido.

Palavras-chave

Cimentos de ionômero de vidro, resistência, desgaste

Abstract

Abstract: Introduction: The glass ionomer cements presents limitations because of their low mechanical strength, which is directly related to the powder / liquid proportion and handling. Aiming to standardize the proportioning and handling, first came the encapsulated glass ionomer cements, which have pre-determined ratio and mechanical manipulation.

Objective: To compare the in vitro wear resistance of the encapsulated glass ionomer cements (Riva Self Cure and Riva Light Cure) and powder/liquid (Riva Self Cure and Riva Light Cure).

Material and: method: The samples were divided into four groups which were made 48 specimens (n=12), 12 for each group with 7 mm diameter by 4 mm thick, and the wear was evaluated according to the mass lost in the process of brushing (10,000 cycles). The obtained values on the difference of the initial and final mass were analyzed using ANOVA and Tamhane's test (p<0.05).

Result: Resulting found that all groups had loss of statistically significant mass, and in ascending order of wear have the light-cured glass, which there was no statistically significant differences between the powder /liquid ionomer (ΔM=11,62mg p=0.001) and encapsulated (ΔM=12,96mg p=0.003) (p<0,05), followed by conventional self-curing (ΔM=20,68mg p=0.014) and encapsulated self-curing (ΔM=47,95mg p=0.002).

Conclusion: Conclude that despite the glass ionomer cement encapsulated standardize the proportion and handling, you can get a similar resistance to wear and even better in powder /liquid.
 

Keywords

Glass ionomer cements, strength, wear

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