INFLUENCE OF DIFFERENT DUAL CURED RESIN LUTING AGENTS ON FRACTURE RESISTANCE AND SHEAR BOND STRENGTH OF LITHIUM DISILICATE OCCLUSAL VENEERS | ||||
| Alexandria Dental Journal | ||||
| Article 3, Volume 48, Issue 1, April 2023, Page 137-145 PDF (498.37 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/adjalexu.2021.80281.1203 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Hala Mustafa Abdel Moaty  1; Ahmed Safwat Elkady2; Amal Ezz Fahmy3
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| 1Conservative department, Restorative dentistry, Faculty of dentistry, Alexandria University | ||||
| 2Operative Dentistry, Conservative Dentistry Department, Faculty of Dentistry, Alexandria University. | ||||
| 3Biomaterial Department, Biomaterial Dentistry , Faculty of Dentistry, Alexandria University. | ||||
| Abstract | ||||
| Introduction: Occlusal veneer are considered promising solutions for coronal tooth structure loss. Pressed lithium di-silicate is the first choice indirect restorative material. Resin cements are the weak point in this biomimetic solution. Objectives: Investigate the fracture resistance and shear bond strength of lithium di-silicate occlusal veneer using different dual cured resin cements. Materials and Methods: 28 sound extracted human permanent molars were used. They were divided into 2 groups (n=14) according to 2 different tooth preparation. For group A the occlusal surface was anatomically reduced for fracture resistance test, while for group B the occlusal surface was flattened for shear bond strength test. Each group was divided into subgroups (n=7) according to resin cement system type used. For group A1 and B1, Panavia F 2.0 self-etch resin cement. While for group A2, B2 Variolink Ethetics total etch resin cement was used. lithium disilicate veneers (1mm) and discs (2×4 mm) were cemented according to manufacturer's instructions. Bonded samples were tested for fracture resistance and shear bond strength after thermocycling. Failure mode was determined. The data were statistically analyzed (p≤0.05). RESULTS: Type of resin cement had a statistically significant difference on the fracture resistance and shear bond strength with P ≤ 0.05. Group (A2) Total etch Variolink Esthetic resin cement provided higher fracture strength (2259.5 N).Also, Group (B2) provided higher bond strength (34.36 MPa). Conclusion: The lithium disilicate occlusal veneers are preferred using total etch adhesive to get the best bond strength and fracture resistance sufficient to withstand loading in molar region. | ||||
| Keywords | ||||
| Fracture resistance; Shear bond; Resin cement; Thermocycling; Occlusal veneers | ||||
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