Academic Journals Database
Disseminating quality controlled scientific knowledge

Hydrolytic degradation of composite resins: effects on the microhardness

ADD TO MY LIST
 
Author(s): Martos Josué | Osinaga Prudêncio Willy Rodo | Oliveira Elisabeth de | Castro Luis Antônio Suita de

Journal: Materials Research
ISSN 1516-1439

Volume: 6;
Issue: 4;
Start page: 599;
Date: 2003;
Original page

Keywords: composite resin | hydrolytic degradation | microhardness

ABSTRACT
The purpose of this investigation was to evaluate the microhardness of two laboratory-processed composites (Artglass; belleGlass) and two direct placement composites (Filtek Z250; Alert), after aging in distilled water. Twenty cylinders (8 mm diameter; 2 mm height) per tested material were prepared and stored in 10 ml of distilled water. Five Knoop hardness measurements were made on the surface of the specimens with a Miniload Hardness Tester under a load of 50 g for 30 s at 10 min, 24 h, 30 and 90 days. Statistical analysis was perfomed using two-way ANOVA, followed by a SNK multiple comparison test (p < 0.05). The analysis showed statistically significant difference among hardness means recorded at the different aging time and the tested materials. It may be concluded that all materials presented hydrolytic degradation due to aging in aqueous environment.
Why do you need a reservation system?      Save time & money - Smart Internet Solutions