Bond Strength of Two Ceramic Systems to Two different Bases Alloy Metals

Abstract

Background The success and longevity of metal-ceramic restoration depend on metal-ceramic bond strength. A variety of ceramic and alloy systems are available nowadays.Objectives the present study aims to evaluate and compare the bond strength of two ceramic systems to Ni-Cr and Co-Cr alloys. Materials and Methods A study sample of forty metal specimens was prepared. Twenty specimens were fabricated from Ni-Cralloy, and twenty of Co-Cr alloy with dimensions (25× 3× 0.5 mm) according to ISO 9693. These are layered with two ceramic systems (Vita ceramic Vita VMK Master), and (IPS d.SIGN Ivoclar) with a dimension of (8×3×1.1 mm). Bond strength was evaluated by a three-point bending mechanical test. After testing the mode of failure was recorded. Scanning electron microscopy (SEM), and (EDS) analysis were performed. Results were analyzed using SPSS with descriptive statistics and a Student t-test.Results The results revealed that the type of alloy used had a significant effect on bond strength (p< 0.01). The Co-Cr alloy had significantly higher means compared to the Ni-Cr alloy. While the ceramic systems had a non-significant effect (p> 0.05).Conclusions The Co-Cr alloy showed significantly higher bond strength with both ceramic systems in comparison to the Ni-Cr alloy. All groups tested had bond strength higher than that demanded by (ISO 9693) with a minimum of 25 Mpa