O método de fotopolimerização é capaz de influenciar nos valores de microdureza das resinas compostas? Um estudo in vitro

Laryssa Karinny Pacheco FERNANDES; Fernanda Vieira BELÉM; Marco Aurélio Benini PASCHOAL; Etevaldo Matos MAIA FILHO; Isabella Azevedo GOMES

doi:10.1590/1807-2577.04322

Original Article

O método de fotopolimerização é capaz de influenciar nos valores de microdureza das resinas compostas? Um estudo in vitro

Is the photopolimerization method able to influence on the microhardness values of composite resins? An in vitro study

Laryssa Karinny Pacheco FERNANDES; Fernanda Vieira BELÉM; Marco Aurélio Benini PASCHOAL; Etevaldo Matos MAIA FILHO; Isabella Azevedo GOMES

http://dx.doi.org/10.1590/1807-2577.04322 Rev. odontol. UNESP, vol.51, e20220043, 2022

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Resumo

Resumo: Introdução: a inovação dos métodos de fotopolimerização foi proposta na tentativa de diminuir o estresse de contração de polimerização das resinas compostas e proporcionar maior conforto ao paciente, reduzindo o tempo de atendimento odontológico.

Objetivo: avaliar a microdureza de duas resinas compostas nanoparticuladas submetidas a diferentes técnicas de polimerização.

Material e método: quarenta espécimes foram divididos em quatro grupos (n=10) da seguinte forma: Filtek Z350 XT^® + técnica imediata (GI); Filtek One Bulkfill^® + técnica imediata (GII); Filtek Z350 XT^® + técnica de pulso tardio (GIII); Filtek One Bulkfill^® + técnica de pulso tardio (GIV). Após o armazenamento em água destilada à temperatura ambiente, os corpos de prova foram direcionados para a medição de microdureza. Utilizou-se teste T para comparação de técnicas e teste Two-Way ANOVA para calcular os efeitos das resinas compostas, técnicas de polimerização e interações referentes à variável dependente (p ≤0,05).

Resultado: a resina Filtek Z350 XT^® apresentou maior dureza na técnica imediata (GI - 312,45 ± 64,37) e pulso tardio (GIII - 244,50 ± 75,63) comparado à resina Filtek One Bulkfill^®, em ambas as técnicas. Observaram-se maiores valores de dureza referentes à técnica imediata, com diferença estatística significativa em relação à resina testada (p = 0,04 - Filtek Z350 XT^®; p = 0,03 - Filtek One Bulkfill^®). Ambos os fatores isolados (resina e técnicas) apresentaram efeito nos valores de microdureza (p = 0,02 e p < 0,01, respectivamente).

Conclusão: a técnica convencional demonstrou atingir maiores valores de dureza quando comparada à técnica de polimerização alternativa.

Palavras-chave

Resinas compostas, polimerização, testes de dureza

Abstract

Abstract: Introduction: the innovation of photopolymerization methods was proposed in an attempt to reduce the polymerization shrinkage stress of composite resins and also provide more comfort to patient reducing the chair time. The aim of this in vitro study was to assess the microhardness of two nanofilled composite resins subject to different curing techniques.

Objective: assess the microhardness of two nanofilled composite resins subject to different curing techniques.

Material and method: forty specimens were divided into four groups (N=10) as follows: Filtek Z350 XT^® + immediate technique (GI); Filtek One Bulkfill^® + immediate technique (GII); Filtek Z350 XT^® + delayed pulse technique (GIII); Filtek One Bulkfill^® + delayed pulse technique (GIV). After storage in distilled water at room temperature the specimens were assessed for microhardness measurement. T-test was used for comparison of techniques and two-way ANOVA used to calculate the effects of composite resins, curing techniques and their interactions on dependent variable (p set at 0.05).

Result: Filtek Z350 XT^® resin presented greater hardness on immediate technique (GI - 312,45 ± 64.37) and delayed pulse (GIII - 244,50 ± 75.63) compared to Filtek One Bulkfill^® under both techniques. Overall, it was observed greater hardness values under immediate technique with a significant statistical difference apart of tested resin (p = 0.04 - Filtek Z350 XT^®; p = 0.03 - Filtek One Bulkfill^®). Both isolated factors (resin and techniques) presented effect on microhardness values (p = 0.02 and p < 0.01, respectively).

Conclusion: the conventional technique demonstrated to reach higher hardness values when compared to the alternative polymerization technique.

Keywords

Composite resins, polymerization, hardness tests

References

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Submitted date:
11/12/2022

Accepted date:
11/21/2022

O método de fotopolimerização é capaz de influenciar nos valores de microdureza das resinas compostas? Um estudo in vitro

Is the photopolimerization method able to influence on the microhardness values of composite resins? An in vitro study

Laryssa Karinny Pacheco FERNANDES; Fernanda Vieira BELÉM; Marco Aurélio Benini PASCHOAL; Etevaldo Matos MAIA FILHO; Isabella Azevedo GOMES

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