Endurance Limit Comparison of Axial and Oblique Forces of Titanium-Based Implant Supported Lithium Disilicate Monolithic Crowns
Abstract
Background. The purpose of this research was to compare the endurance limits of axial (0 deg) and oblique (20 de) cyclic loading and survival of e.max lithium disilicate monolithic crowns cemented to TiBase hybrid abutments. Null hypothesis: there is no difference in endurance limits of TiBase implant supported lithium disilicate mesostructured crowns subjected to axial and oblique forces. Methods. A total of 40 lithium disilicate premolar crowns (IPS e.max CAD Ivoclar Vivadent) cemented on TiBase (NB RS 3.5L, Dentsply-Sirona) abutments were separated into 2 groups. Group 1 consisted of 20 samples and was subjected to axial forces at 0 deg. Group 2 consisted of 20 samples and was subjected to oblique forces at 20 deg from the axial orientation. Force was applied to the samples by a universal testing machine (Model 5543, Instron, Canton, MA) using the staircase fatigue technique. The data was collected and analyzed to calculate the endurance limit of axial vs oblique forces. Statistical analysis was performed using t-test with a p-value <0.001 considered significant. Results. 38 samples were included in the data comparison. Success group showed a mean endurance limit of 721N for 0 deg and 951N for 20 deg, P= 0.027. Failure groups showed a mean endurance limit of 635N for 0deg and 1014N for 20 deg, P= <0.001. Conclusion. The null hypothesis was rejected. TiBase lithium disilicate mesostructures have different endurance limits at 0 vs 20. The endurance limit of mesostructures subjected to oblique loading at 20 deg was significantly greater than those subjected to an axial load at 0 deg. Practical Implications. Lithium disilicate crowns are one of the most common esthetic final restorations or mesostructures that can be designed and fabricated using CAD/CAM technology.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 21, 2021
- Accession Number
- AD1182990
Entities
People
- Donald Rice
- Gen Paek
- Sandra S Delgado
- Wen Lien
Organizations
- Uniformed Services University of the Health Sciences