Flexural strength and elastic module of high, medium and low density resins

Authors

  • Mario Sezin Universidad Nacional de Córdoba. Facultad de Odontología,Departamento de Rehabilitación Bucal Cátedra de Operatoria I “A”.

Keywords:

Physical properties, viscoelastic properties, composite resins, flexion resistance, elastic module.

Abstract

Aim: To determine the flexural strength and elastic modulus of high, medium and low density composite resins. Material and methods: 88 specimens of 25mmx2mmx2mm were divided into 11 groups of 8 according to the resin. Group 1: Filtek Z350 XT, group 2: Rok, group 3: Filtek P60, group 4: Filtek Z250 XT, group 5: Polofil Supra, group 6: Te-Econom Plus, Group 7: Grandio, Group 8: Brilliant New Line, Group 9: Prisma AP.H, group 10: Wave Flow and Group 11: Brilliant Flow. Four samples were preserved for 24 hours and four for 30 days.  An universal test machine was used with a head speed of 1mm per minute by applying a three points load until fracture. Kruskal Wallis test was applied.  Results: Flexural strength 24 hours (MPa): higher values Filtek Z250 XT (112, 25 +/-4.52), Filtek P60 (110, 75 +/-6.43) and Grandio (109, 98 +/-9, 12) and lower Brilliant Flow (49, 00 +/-2.27). 30 days: higher values Grandio (124, 35 +/-14.78), Filtek P60 (119, 98 +/-11.60) and lower Rok (59, 50 +/-4.94) with significant differences (p<0,05). Elastic module 24 hours (GPa): Higher values Grandio (8.33 +/-0.46), Filtek Z250 XT (6.96 +/-0.51), Filtek P60 (6.46 +/-0.29) and lower Brilliant Flow (1.52 +/-0.16). 30 days: higher value Grandio (10.51 +/-0.47) and lower Wave Flow (2.17 +/-0.13) with significant differences (p<0,05). The time influenced significantly increasing values for both tests (p<0,05). Conclusion: Composite resins showed different behaviors. Time factor influenced increasing values excepting Rok and Filtek Z250 XT which kept its approximately equal values.

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Published

2018-12-19

Issue

Vol. 28 No. 3 (2018)

Section

RESEARCH

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