1997-9-1-30-35 - Saudi Dental Journal

ISSN (Print) 1013-9052
EISSN 1658-3558

The Saudi Dental Journal,
P.O. Box 52500,
Riyadh 11563,
Kingdom of Saudi Arabia

Tel.	966-1-467-7328
Fax.	933-1-467-7308 / 966-1-467-7534
Email	saudidj@ksu.edu.sa

Interfacial Bond Behavior of Composite Resin-Veneered

Amalgam as a Function of Temperature under

water immersion.

Kbamis Hassan, BDS, MSD, PhD*, Salwa Khier, BDS, MSD, MSc, PhD*, Maha Nahass, BDS**
* College of dentistry, King Saud University, P.O.Box 60169, Riyadh 11545, Saudi Arabia
**Riyadh Central Hospital, Ministry of Health, Riyadh, Saudi Arabia.

A durable resin bond to dental amalgam is required for the clinical success of composite resin-veneered amalgam restorations. The reported bond strengths differ for various adhesive resins. Laboratory procedures utilized to simulate aging of these restorations in the oral cavity vary widely. Water storage at a constant temperature (37°C) or thermal cycling are the conditions most often used. The objective of this study was to investigate the bond strength of composite resins to amalgam using different dental adhesives at various temperatures while immersed under water. Sandblasted amalgam samples were prepared and composite resins were bonded to them using three different dental adhesive systems. All bonded samples were stored in water at 37°C for 1 week before testing. Shear bond strength was determined while bonded samples were immersed in water with temperatures ranging from 20-70°C using universal testing machine. Each sample was held at its test temperature for 5 min. before testing to establish temperature equilibrium. The results revealed that, in general, shear bond strength slightly changed with temperature variations among the three adhesive systems. This change could be explained by the mismatch in the coefficients of thermal expansion of bond components and differences in the chemical composition of the adhesive systems.

Saudi Dental Journal 1997;9(1):30-35.