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Fracture Resistance of Titanium-Based Lithium Disilicate and Zirconia Implant Restorations
Evan E Roberts1, Clifton W Bailey2, Deborah L Ashcraft-Olmscheid3
1Advanced Education in General Dentistry Residency, US Air Force Academy, Colorado Springs, CO.
Purpose:
To evaluate the fracture resistance of a newer lithium disilicate abutment material.
Materials And Methods:
A premolar-shaped implant crown was designed using CAD/CAM software, and four groups of implant and crown combinations were milled: (1) lithium-disilicate hybrid-abutment crown; (2) "screwmentable" lithium-disilicate hybrid abutment/lithium-disilicate crown with screw channel; (3) lithium-disilicate hybrid abutment/lithium-disilicate crown; and (4) zirconia hybrid abutment/lithium-disilicate crown (control). The specimens were cemented to a titanium-base implant system, subjected to thermocycling and cyclic loading, and fractured in a material testing device.
Results:
The lithium-disilicate hybrid-abutment crown had significantly greater fracture load than all the other groups, which were not significantly different from each other.
Conclusions:
Based on fracture load, the new lithium-disilicate hybrid-abutment material may serve as a viable alternative to the use of zirconia as a hybrid-abutment material.
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