مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Information Journal Paper

Title

Effect of thermomechanical loading on fracture resistance and failure mode of new pressable zirconia-reinforced lithium disilicate onlay restoration

Pages

  29-36

Abstract

 Background. Insufficient information exists regarding the Fracture resistance and failure pattern of newly developed zirconia-reinforced Lithium disilicate (ZL, Vita Ambria) onlays. This in vitro study compared the Fracture resistance of two types of onlays: monolithic Lithium disilicate (LD) and monolithic ZL. Methods. Forty-eight ceramic Onlay restorations were fabricated on epoxy dies using a maxillary first premolar model. The samples were divided into two main groups: LD and ZL. Half of each group was subjected to thermomechanical fatigue loading (TML) using a chewing simulator. All the samples were cemented with self-adhesive resin cement. Subsequently, they were loaded until failure in a universal testing machine, and the fracture patterns and resistance were recorded. Results. Before TML, ZL demonstrated the highest statistically significant mean Fracture resistance (499. 76±34. 14N) compared to LD (470. 40±27. 38N). After TML, ZL showed the highest non-statistically significant mean Fracture resistance (429. 27±131. 42N), while LD’s mean Fracture resistance decreased (377. 31±62. 18N). Conclusion. Monolithic zirconia-reinforced onlays demonstrated higher Fracture resistance and a more favorable failure mode compared to LD. However, the impact of thermomechanical aging resulted in reduced Fracture resistance for both materials, with a notable preference observed for ZL.

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