In-Vitro Comparison of Fracture Strength of Endocrowns and Overlays in Endodontically Treated Teeth Manufactured with Monolithic Lithium Disilicate and Zirconia
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- Maya Veselinova
- Department of Operative Dentistry, National and Kapodistrian University of Athens, 11527 Athens, Greece
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- Sofia Diamantopoulou
- Department of Operative Dentistry, National and Kapodistrian University of Athens, 11527 Athens, Greece
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- Chariklia Paximada
- Department of Operative Dentistry, National and Kapodistrian University of Athens, 11527 Athens, Greece
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- Efstratios Papazoglou
- Department of Operative Dentistry, National and Kapodistrian University of Athens, 11527 Athens, Greece
抄録
<jats:p>To evaluate the fracture strength and the failure mode of endodontically treated molars restored with monolithic lithium disilicate and zirconia endocrowns and overlays. A total of 48 extracted mandibular molars were endodontically treated, decoronated 2 mm above the cementoenamel junction and divided into four 12-specimen groups. Group ELD: lithium disilicate endocrowns. Group EZ: monolithic zirconia endocrowns. Group OLD: lithium disilicate overlays. Group OZ: monolithic zirconia overlays. Overlays did not extend in the pulp chamber and endocrowns extended in the pulp chamber 2 mm. After adhesive bonding of the restorations, the specimens were subjected to thermocycling (×5000 cycles) and then to fracture resistance testing at lateral static loading (1 mm/min) at a universal testing machine. The failure mode of the specimens was qualitatively evaluated. Differences in means were compared using with t-tests for independent samples or Mann–Whitney test (p < 0.05). Weibull distribution analysis was also performed. Group ELD showed significantly higher fracture strength than all other groups (p = 0.001), and the highest Weibull modulus. Conclusions: Lithium disilicate endocrowns exhibit higher fracture strength and are more reliable compared to the other types of restorations examined. Endocrowns had more catastrophic failures compared to overlays.</jats:p>
収録刊行物
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- Journal of Functional Biomaterials
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Journal of Functional Biomaterials 14 (8), 422-, 2023-08-11
MDPI AG