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Published on: December 20, 2024
Fracture resistance of aluminium oxide and lithium disilicate-based crowns using different luting cements: an in
Ahed M Al-Wahadni1, David L Hussey, Nicholas Grey
1Department of Restorative Dentistry, Faculty of Dentistry, University of Science and Technology, Irbid, Jordan. ahed@just.edu.jo
Aim:
The aim of this study was to investigate the fracture resistance of two types of ceramic crowns cemented with two different cements.
Methods And Materials:
Forty premolar crowns were fabricated using lithium-disilicate (IPS Empress-2) and glass-infiltrated aluminium-oxide (In-Ceram) ceramic systems. The crowns were divided into four groups (n=10) with Group 1 (IPS Empress-2) and Group 2 (In-Ceram) cemented with glass ionomer cement. Group 3 (IPS Empress-2) and Group 4 (In-Ceram) were cemented with resin cement. Crowns were tested in a universal testing machine at a compressive-load speed of 10 mm/min. Fracture modes were grouped into five categories. One way analysis of variance (ANOVA) and Bonferroni post-hoc tests were used to detect statistical significances (p<0.05).
Results:
The mean (SD) fracture resistance (Newtons) for Groups 1 to 4 were: 245.35 (82.69), 390.48 (67.03), 269.69 (10.33), and 418.36 (26.24). The cement type had no statistical significant effect (p>0.05) on fracture resistance within each ceramic system tested. In-Ceram crowns cemented with either glass ionomer or resin cements exhibited a statistically significantly higher fracture-resistance than IPS Empress-2 crowns (p<0.05). Minimal fracture in the test crowns was the common mode exhibited.
Conclusion:
Fracture resistance of IPS Empress-2 and In-Ceram crowns was not affected by the type of cement used for luting.
Clinical Significance:
Both In-Ceram and IPS Empress-2 crowns can be successfully luted with the cements tested with In-Ceram exhibiting higher fracture resistance than IPS Empress-2.