The effect of endodontic access preparation on the failure load of lithium disilicate glass-ceramic restorations

SUMMARY This study evaluated the influence of ceramic thickness and ceramic materials on fracture resistance of posterior partial coverage ceramic restorations. Forty extracted molars were allocated into four groups (n=10) to test for two variables: 1) the thickness of ceramic (1 mm or 2 mm) and 2) the ceramic materials (a lithium disilicate glass-ceramic [IPS e.max] or leucite-reinforced glass ceramic [IPS Empress]). All ceramic restorations were luted with resin cement (Variolink II) on the prepared teeth. These luted specimens were loaded to failure in a universal testing machine, in the compression mode, with a crosshead speed of 1.0 mm/min. The data were analyzed using two-way analysis of variance and the Tukey Honestly Significantly Different multiple comparison test (α =0.05). The fracture resistance revealed a significant effect for materials (p<0.001); however, the thickness of ceramic was not significant (p=0.074), and the interaction between the thickness of ceramic and the materials was not significant (p=0.406). Mean (standard deviation) fracture resistance values were as follows: a 2-mm thickness of a lithium disilicate bonded to tooth structure (2505 [401] N) revealed a significantly higher fracture resistance than did a 1-mm thickness of leucite-reinforced (1569 [452] N) and a 2-mm thickness of leucite-reinforced ceramic bonded to tooth structure (1716 [436] N) (p<0.05). There was no significant difference in fracture resistance values between a lithium disilicate ceramic at 1-mm thickness (2105 [567] N) and at 2-mm thickness. Using a lithium disilicate glass ceramic for partial coverage restoration significantly improved fracture resistance compared to using a leucite-reinforced glass ceramic. The thickness of ceramic had no significant effect on fracture resistance when the ceramics were bonded to the underlying tooth structure.

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Newer vs. older CAD/CAM burs: Influence of bur experience on the fatigue behavior of adhesively cemented simplified lithium-disilicate glass-ceramic restorations

Journal of the Mechanical Behavior of Biomedical Materials ◽

10.1016/j.jmbbm.2019.04.002 ◽

2019 ◽

Vol 95 ◽

pp. 172-179 ◽

Cited By ~ 4

Author(s):

Guilherme Schmitt de Andrade ◽

Vandeberg Diniz ◽

Carlos Eduardo Datte ◽

Gabriel Kalil Rocha Pereira ◽

Andressa Borin Venturini ◽

...

Keyword(s):

Glass Ceramic ◽

Fatigue Behavior ◽

Lithium Disilicate ◽

Cad Cam ◽

Ceramic Restorations

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Accelerated loading frequency does not influence the fatigue behavior of polymer infiltrated ceramic network or lithium disilicate glass-ceramic restorations

Journal of the Mechanical Behavior of Biomedical Materials ◽

10.1016/j.jmbbm.2020.103905 ◽

2020 ◽

Vol 110 ◽

pp. 103905

Author(s):

Helder Callegaro Velho ◽

Kiara Serafini Dapieve ◽

Gabriel Kalil Rocha Pereira ◽

Sara Fraga ◽

Luiz Felipe Valandro ◽

...

Keyword(s):

Glass Ceramic ◽

Fatigue Behavior ◽

Lithium Disilicate ◽

Loading Frequency ◽

Ceramic Restorations

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Rehabilitation of a Severely Worn Dentition with Partial Lithium-disilicate Glass Ceramic Restorations: A Case Report

European Annals of Dental Sciences ◽

10.52037/eads.2021.0009 ◽

2021 ◽

Author(s):

Ece İrem Oğuz ◽

Semih Berksun

Keyword(s):

Case Report ◽

Glass Ceramic ◽

Treatment Options ◽

Lithium Disilicate ◽

Vertical Dimension ◽

Posterior Teeth ◽

Anterior Teeth ◽

Occlusal Vertical Dimension ◽

Ceramic Restorations ◽

Laminate Veneers

Rehabilitation of worn dentition is a challenging task because several predisposing factors may be included in the pathogenesis. The treatment options and process should be carefully considered based on the clinical condition and patients’ requirements. This case report represents the esthetic rehabilitation of a 68-year-old patient who exhibited severely worn teeth caused by attrition and erosion. After clinical evaluation, 3 mm increase in occlusal vertical dimension was planned with partial lithium-disilicate ceramic restorations as laminate veneers for anterior teeth and vonlays (onlays with veneer extentions) for posterior teeth in maxilla. The adaptation of the patient to the increased occlusal vertical dimension was tested for 1 month by provisional direct composite restorations. As the patient did not show any discomfort, definitive restorations were completed. The patient was satisfied with the esthetics and functionality of her new dentition.

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