Efeito da termociclagem na avaliação da resistência flexural e módulo de elasticidade em diferentes resinas compostas diretas
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2024-03-07
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Universidade Estadual Paulista (Unesp)
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Objetivo: O objetivo deste estudo é avaliar o efeito da termociclagem na resistência flexural, módulo de elasticidade e microdureza de diferentes resinas compostas de
uso direto.Material e Métodos: Um total de 120 espécimes foram obtidos utilizando uma matriz de aço inoxidável com as especificações da norma ISO 4049 nas
seguintes dimensões para comprimento; largura e altura: 25x2x2 (mm). Foram utilizadas 6 diferentes marcas comerciais de resina composta (n=20): TP- Tetric
Prime; GA- G-aenial A’chord; NS- Neo Spectra ST HV; SS- Simple Shade; FU- Filtek Universal e AF5- Admira Fusion 5. Os incrementos de resina foram feitos com a
matriz sob uma placa de vidro lisa. A polimerização foi feita por 40 segundos à 600 mW/cm2 e os excessos de material foram removidos com discos abrasivos e de
polimento. Metade dos espécimes de cada grupo (n=10) foram armazenados em água (24h, 37ºC) enquanto a outra metade dos espécimes foram submetidos à termociclagem por 3.000 ciclos, para posteriormente ser realizado o teste de flexão 3 pontos através de máquina universal de ensaios (EMIC - DL 200MF) (50kg,
1mm/min Resultados: Diferenças significativas foram observadas para os fatores tipo de resina e termociclagem em relação à resistência flexural, mas não para a
interação entre eles. Os resultados do teste de Tukey foram: Resina - GA84.56(10.24)a, TP-102,1(7.77)b, SS-110.02(12.11)bc, AF5-110.24(11.37)bc, NS112.91(10.37)c, FU-144,30(9.36)d. Termociclagem – Com-105,97(20.80)a, Sem115,41(19.18)b. Para o módulo de elasticidade, foram observadas diferenças para
os dois fatores em estudo e para a interação entre eles (p<0,05). Os resultados para o tipo de resina foram: Resina – GA-8,18(0.45)a, TP-8,72(0.34)b, NS-9,13(0.34)c,
SS-10,24(0.34)d, AF5-10,44(0.57)d, FU-11,50(0.36).Termociclagem – Sem9,56(1.15)a, Com-9,84(1.24)b Conclusão: A termociclagem reduziu a resistência
flexural, mas aumentou o módulo de elasticidade; G-aenial A'chord apresentou os menores resultados para resistência flexural e módulo de elasticidade, enquanto
Filtek Universal apresentou os maiores valores.
Objective: The objective of this study was to evaluate the effect of thermocycling on the flexural strength and elastic modulus of different direct resin composites. Material and Methods: A total of 120 specimens were obtained using a stainless steel matrix with ISO 4049 specifications in the following dimensions for length; width and height: 25x2x2 (mm). 6 different commercial brands of composite resin were used (n=20): TP- Tetric Prime; GA- G-aenial A’chord; NS- Neo Spectra ST HV; SS- Simple Shade; FU- Filtek Universal and AF5- Admira Fusion 5. The resin increments were made with the matrix under a smooth glass plate. The polymerization was carried out for 40 seconds at 600 mW/cm2 and excess material was removed with abrasive and polishing discs. Half of the specimens from each group (n=10) were stored in water (24h, 37ºC) while the other half of the specimens were subjected to thermocycling for 3,000 cycles, and then the 3-point flexion test was carried out using a universal testing machine. (EMIC - DL 200MF) (50kg, 1mm/min). Results: Significant differences were observed for the factors resin type (p=0.001) and thermocycling (p=0.001) in relation to flexural strength, but not for the interaction between them. Tukey's test results were: Resin - GA-84.56(10.24)a, TP-102.1(7.77)b, SS110.02(12.11)bc, AF5-110.24(11.37)bc, NS-112.91(10.37) c, FU-144,30(9.36)d. Thermocycling – With-105.97(20.80)a, Without-115.41(19.18)b. For the elastic modulus, differences were observed for the two factors under study and for the interaction between them (p<0.05). The results for the type of resin were: Resin – GA-8.18(0.45)a, TP-8.72(0.34)b, NS-9.13(0.34)c, SS-10.24(0.34)d , AF5- 10.44(0.57)d, FU-11.50(0.36). Thermocycling – Without-9.56(1.15)a, With9.84(1.24)b. Conclusion: Thermocycling reduced flexural strength but increased the elastic modulus; G-aenial A'chord presented the lowest results for flexural strength and elastic modulus, while Filtek Universal presented the highest values.
Objective: The objective of this study was to evaluate the effect of thermocycling on the flexural strength and elastic modulus of different direct resin composites. Material and Methods: A total of 120 specimens were obtained using a stainless steel matrix with ISO 4049 specifications in the following dimensions for length; width and height: 25x2x2 (mm). 6 different commercial brands of composite resin were used (n=20): TP- Tetric Prime; GA- G-aenial A’chord; NS- Neo Spectra ST HV; SS- Simple Shade; FU- Filtek Universal and AF5- Admira Fusion 5. The resin increments were made with the matrix under a smooth glass plate. The polymerization was carried out for 40 seconds at 600 mW/cm2 and excess material was removed with abrasive and polishing discs. Half of the specimens from each group (n=10) were stored in water (24h, 37ºC) while the other half of the specimens were subjected to thermocycling for 3,000 cycles, and then the 3-point flexion test was carried out using a universal testing machine. (EMIC - DL 200MF) (50kg, 1mm/min). Results: Significant differences were observed for the factors resin type (p=0.001) and thermocycling (p=0.001) in relation to flexural strength, but not for the interaction between them. Tukey's test results were: Resin - GA-84.56(10.24)a, TP-102.1(7.77)b, SS110.02(12.11)bc, AF5-110.24(11.37)bc, NS-112.91(10.37) c, FU-144,30(9.36)d. Thermocycling – With-105.97(20.80)a, Without-115.41(19.18)b. For the elastic modulus, differences were observed for the two factors under study and for the interaction between them (p<0.05). The results for the type of resin were: Resin – GA-8.18(0.45)a, TP-8.72(0.34)b, NS-9.13(0.34)c, SS-10.24(0.34)d , AF5- 10.44(0.57)d, FU-11.50(0.36). Thermocycling – Without-9.56(1.15)a, With9.84(1.24)b. Conclusion: Thermocycling reduced flexural strength but increased the elastic modulus; G-aenial A'chord presented the lowest results for flexural strength and elastic modulus, while Filtek Universal presented the highest values.
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Palavras-chave
Módulo de elasticidade, Resina composta, Resina de cor simplificada, Resistência Flexural, Termociclagem, Elastic Modulus, Composite Resin, Simplified shade composite resin, Flexural Strength, Thermocycling