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- Title
Hardness and compressive strength of indirect composite resins: effects of immersion in distilled water.
- Authors
Da Fonte Porto Carreiro, A.; Dos Santos Cruz, C. A.; Vergani, C. E.
- Abstract
The aim of this study was to evaluate the effect of ageing in distilled water on the hardness and compressive strength of a direct composite resin Z100, a feldspatic porcelain (Noritake) and three indirect composites (Artglass, Solidex and Targis). For the Vickers hardness tests, five disk-shaped specimens (2 × 4 mm) of each material were prepared according to the manufacturers' instructions. The hardness tests were conducted using a Vickers diamond indentor. Compressive strength measurements were recorded on cylindrical specimens with a diameter of 6 mm and a length of 12 mm. The compression tests were carried out with a constant cross-head speed of 0.5 mm min-1 on a mechanical test machine. For each material, 10 specimens were tested after 7 days of dry storage at 37 ± 1 °C and 10 specimens were tested after water storage at 37 ± 1 °C for 180 days. Noritake porcelain specimens showed higher hardness values than the composites. Among the composite materials, Z100 promoted the highest VHN values, regardless of the ageing periods. The results showed that Solidex and Z100 had the highest compressive strength values. Ageing in water reduced the hardness for all composites, but had no long-term effect on the compressive strength.
- Subjects
DENTAL resins; SYNTHETIC gums &; resins; DENTAL materials; BIOMEDICAL materials; WATER immersion; DENTISTRY
- Publication
Journal of Oral Rehabilitation, 2004, Vol 31, Issue 11, p1085
- ISSN
0305-182X
- Publication type
Article
- DOI
10.1111/j.1365-2842.2004.01147.x