Two-unit Cantilever Implant Prostheses Made of Monolithic Zirconia or PFM

Randomized Controlled Clinical Trial of Two-unit Cantilever Implant Prostheses Made of Monolithic Zirconia on Titanium Base Abutments or Porcelain-fused to Metal on Gold Abutments

The aim of is to compare the survival rate and technical outcomes of cantilever implant-supported fixed denture prosthetics (cFDPs) made either out of monolithic zirconia bonded to a titanium base in a digital workflow, or porcelain fused-to metal using a gold abutment in a conventional workflow. In addition, biological outcomes, wear patterns, PROMs and time efficiency will be recorded. The null hypothesis is: the reconstruction type does not influence the survival rate and technical outcomes of 2-unit implant-supported cFDP.

Inclusion Criteria:

• Minimal age of 22 years old.
• No general medical condition which represents a contraindication to implant treatment
• Good oral hygiene (PII ≤ 20%), and healthy periodontal tissues (BOP≤ 20%)
• Two adjacent-teeth gap in posterior maxilla or mandible arch (first premolar, second premolar, first molar, second molar) with an osseointegrated regular or wide-diameter bone-level implant in a prosthetically correct position to allow occlusal screw-retention. Free-end edentulous gaps can also be included
• Presence of antagonist occlusal units

Exclusion Criteria:

• Severe bruxism or clenching habits
• Patients with inadequate oral hygiene or persistent intraoral infection
• Women who are pregnant or breast feeding at the day of inclusion
• Smokers exceeding 15 cigarettes / day, or equivalent; patients chewing tobacco
• Unable or unwilling to cooperate for the trial period
• Estimated cantilever crown mesial-distal length > 10 mm
• Estimated implant crown height (from implant platform to occlusal contact points) > 15 mm