Diametral tensile strength and Vickers hardness of a composite after storage in different solutions

This study evaluated the Vickers hardness (VHN) and diametral tensile strength (DTS) of the composite Z100 (3M ESPE) cured with: Quartz-Tungsten-Halogen light curing unit (QTH) (700mW/cm2- 40 s) and Argon laser (1,000mW/cm2- 10 s). Specimens of 2 mm depth and 8 mm diameter were immersed for 30 days...

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Bibliographic Details
Published in:Journal of Oral Science 2007, Vol.49(1), pp.61-66
Main Authors: Medeiros, Igor S., Gomes, Maurício N., Loguercio, Alessandro D., Filho, Leonardo E. R.
Format: Article
Language:English
Subjects:
Acetic Acid
Analysis of Variance
composite resins
Composite Resins - radiation effects
dental materials
Dental Stress Analysis
Dentistry
Drug Storage
Ethanol
Halogens
Hardness
Lasers, Gas
Light
Materials Testing
Phase Transition
Propionates
Regression Analysis
Silicon Dioxide - radiation effects
Statistics, Nonparametric
Tensile Strength
Water
Zirconium - radiation effects
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Summary:This study evaluated the Vickers hardness (VHN) and diametral tensile strength (DTS) of the composite Z100 (3M ESPE) cured with: Quartz-Tungsten-Halogen light curing unit (QTH) (700mW/cm2- 40 s) and Argon laser (1,000mW/cm2- 10 s). Specimens of 2 mm depth and 8 mm diameter were immersed for 30 days at 37°C in different storage means: water, alcohol, acetic acid, propionic acid and dry (control). The DTS (n = 8) was determined with a crosshead speed of 0.5 mm/min. The VHN (n = 8) test was carried out using a 50 g load for 60 s. Statistical analysis was performed by two-way ANOVA and Tukey's test (α = 0.05). The relationship between VHN and DTS was observed by Pearson correlation. The light source was not significant in both tests (VHN: P < 0.18; DTS: P < 0.92), but the factor storage showed significance (P < .001). Mechanical properties of the control group were statistically superior to those of the other storage groups (VHN = 102.2; DTS = 42.3 MPa). The alcohol group showed the lowest VHN (93.3) and DTS (33.8 MPa) values, which were similar to values for propionic (VHN = 97.5; DTS = 35.9 MPa) and acetic acids (VHN = 97.8; DTS = 36.1 MPa), but different from that of water (VHN = 102.2; DTS = 42.3 MPa). The relationship between VHN and DTS values presented a positive correlation (r2 = 0.90; P < 0.01). (J. Oral Sci. 49, 61-66, 2007)
ISSN:1343-4934
1880-4926
DOI:10.2334/josnusd.49.61