Y-TZP and In-mouth Low Thermal Degradation: A Prospective Clinical Study

Low Thermal Degradation of Monolithic Zirconia Prostheses: an up to 5-year Original Prospective Clinical Study Using ex Vivo Analyses

The objective of this work is to study in-mouth aging and LTD of monolithic zirconia restorations. Microstructural changes characteristic of LTD processes, wear, and clinical behaviour following standard parameters will be evaluated. Notably Raman spectroscopy and 3D laser surface analysis will be used, directly on the restorations, which will be removed at regular intervals.The working hypothesis is that LTD process is very slow at the scale at the lifespan of dental prostheses.

Inclusion Criteria:

• Full zirconia crowns in the posterior region (molar/premolar)
• On teeth or implants
• Single unit restorations cemented on natural teeth and implants (including screw-retained restorations if possible, but no internal connections)
• Multi-unit restorations on implants
• If nightguard: to be performed on the antagonist

Exclusion Criteria:

• Patients with removable prosthesis as an antagonist