Fracture load of ultrathin occlusal veneers: Effect of thickness and surface conditioning

This in-vitro study is planned to analyze the effect of different thicknesses of ceramic occlusal veneers and different surface treatments on fracture resistance. A total of 48 sound mandibular molars are anatomically prepared from the occlusal surface with two different thicknesses (1.0 and 0.5 mm)...

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Bibliographic Details
Published in:Journal of the mechanical behavior of biomedical materials 2023-09, Vol.145, p.106030-106030, Article 106030
Main Authors: Zahran, Maged, Abo El-Farag, Shaimaa, Soltan, Hassan, Attia, Ahmed
Format: Article
Language:English
Subjects:
Bonding
Ceramics - chemistry
Dental Porcelain
Fracture resistance
Humans
Hydrofluoric Acid - chemistry
Materials Testing
Molar
Occlusal veneer
Resin Cements - chemistry
Surface Properties
Zirconia-reinforced glass ceramic
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Summary:This in-vitro study is planned to analyze the effect of different thicknesses of ceramic occlusal veneers and different surface treatments on fracture resistance. A total of 48 sound mandibular molars are anatomically prepared from the occlusal surface with two different thicknesses (1.0 and 0.5 mm). CAD/CAM zirconia-reinforced glass ceramic blocks (Vita Suprinity) are used for fabricating occlusal veneers. The teeth are randomly divided into two primary groups A and B (n=24) according to occlusal veneer thickness. Each group is subdivided according to surface conditioning into three equal subgroups (n=8)—subgroup HF: etching with hydrofluoric acid and ceramic primer application; subgroup APF: etching with acidulated phosphate fluoride and ceramic primer application; subgroup EP: conditioning with etch and prime only. Dual-cure adhesive resin cement (Multilink Automix) is utilized to adhesively bond the veneers. All specimens are subjected to 240,000 cycles of dynamic load aging prior to the fracture resistance test. The fracture resistance is measured in Newton (N). The Failure mode patterns are analyzed and categorized using a scanning electron microscope (SEM). The results are analyzed using a two-way ANOVA with Bonferroni's Post-Hoc test, followed by a one-way ANOVA for each factor. That is in addition to one-way ANOVA for surface treatment under each thickness, each followed by Bonferroni's Post-Hoc test. Then, a T-test is used to compare the two thicknesses under each surface treatment. All tests are set at 0.05 significance level. The two-way ANOVA test revealed that restoration thickness and surface treatment both significantly affect the fracture resistance values (p
ISSN:1751-6161
1878-0180
DOI:10.1016/j.jmbbm.2023.106030