Stress/strain behavior of some dental luting cements

Abstract

Baa, G. & Espevik, S. Stress/strain behavior of some dental luting cements. Acta Odont. Scand. 36, 45–49

The compressive strength, modulus of elasticity and the plastic strain at fracture have been studied for several dental luting cements. Stress/strain diagrams of cylindrical specimens using two different crosshead speeds (2 mm/min and 0. 1 mm/min) at 23° and 37°C showed that large differences existed between various luting cements.

A zinc phosphate cement exhibited high strength, high modulus of elasticity and a small plastic strain at fracture. A resin cement also had high strength, but elastic and plastic strains were high. A polycarboxylate and an EBA-cement both showed low values of strength and modulus of elasticity combined with a high degree of plastic deformation at fracture. Testing with low strain rate at 37 °C accentuated the differences between these two materials and the zinc phosphate cement.

Key Words:

• Dental materials
• mechanical properties