Effect of different cementation techniques and curing modes on shear bond strength of CAD/CAM occlusal veneers to tooth structure

Document Type : Original Article

Authors

1 Lecturer,Dental Biomaterials Department, Faculty of Dentistry, Tanta University, Tanta, Egypt.

2 Lecturer, Restorative Dentistry Department, Faculty of Dentistry, Tanta University, Tanta, Egypt.

3 Lecturer, Department of Fixed Prosthodontics, College of Dentistry, Tanta University

10.21608/edj.2025.402766.3548

Abstract

Objectives: The current study intended to assess the effect of different cementation techniques and curing modes on shear bond strength of CAD/CAM occlusal veneers to tooth structure. Materials &methods: 42 Extracted upper premolars were collected and after disinfection standardized tooth preparations were done by precision saw. Lithium disilicate glass ceramic (IPS e.max CAD) occlusal veneers were prepared then cemented to teeth preparations. Specimens were allocated into two groups (n=21) according to cementation technique: Group I: total-etch resin cement (Duo-link) and Group II: self-adhesive resin cement (Biscem). Then each group was subdivided into three subgroups (n=7) regarding different curing modes: conventional, high energy and ramp curing modes. All the specimens were thermo-cycled before testing of shear bond strength by universal testing machine. Inspection of failure mode pattern was carried out by stereomicroscope. One way ANOVA test was utilized for comparing between subgroups then multiple comparison Tuckey test. The independent t-test was utilized to compare the studied groups at each subgroup. Results: Both groups while utilizing high energy curing mode demonstrated significantly lower bond strength than other curing modes. In comparison to self-adhesive resin cement , total-etch resin cements recorded significant improvement in bond strength while utilizing conventional or soft curing mode. While there was no significant difference between them when high cure mode was used. Conclusion: Higher bond strength can be attained while utilizing conventional and ramp cure compared to high curing mode for. Total-etch resin cement proved its superior bonding to tooth structure in comparison to self-adhesive resin cement.

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Egyptian Dental Journal
Volume 71, Issue 4 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
October 2025
Pages 3267-3278

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