Intraoral vs Extraoral Cementation of Zirconia Bridges on Ti-Bases: Microstrain Evaluation

Condition(s) studied

Investigational drug(s) / intervention(s)

Extraoral cementation on Ti-bases: Extraoral (laboratory) cementation of a three-unit zirconia bridge to Ti-bases on the working model using a standardized protocol, with strain-gauge evaluation performed prior to prosthesis delivery.

Intraoral cementation on Ti-bases: Intraoral (chairside) cementation of an identical three-unit zirconia bridge to Ti-bases following a standardized protocol. The assembly is removed and sent to the laboratory, where strain-gauge evaluation is performed approximately 1 week later (7 ± 3 days).

Study summary

This prospective clinical study compares two cementation techniques for implant-supported zirconia fixed partial dentures on titanium bases (Ti-bases): extraoral cementation performed on the working model and intraoral cementation performed chairside. Thirty clinical cases with two osseointegrated implants requiring a multi-unit zirconia restoration will be recruited at the UIC Dental Clinic. For each case, two restorations with identical design will be produced: one will be cemented extraorally (control) and an identical replica will be cemented intraorally (test). Micro-deformation will be assessed as peri-implant microstrain (µε) using a standardized strain-gauge setup and the same recording protocol for both techniques. The primary analysis compares microstrain between intraoral and extraoral cementation within each case; implant/prosthetic events will be recorded descriptively.

Eligibility

Primary outcome measure(s)

• Peri-implant microstrain (µε) measured by strain gauges — Pre-delivery (laboratory assessment) and ~1 week after intraoral cementation (7 ± 3 days).
  Micro-deformation around implant replicas supporting a three-unit zirconia bridge on Ti-bases, recorded with bonded strain gauges and expressed as microstrain (µε). Measurements are obtained for both cementation techniques (extraoral vs intraoral) using the same standardized recording protocol. Measurements for the extraoral (control) restoration are recorded prior to delivery, and measurements for the intraoral (test) restoration are recorded approximately 1 week after chairside cementation once the restoration is received by the laboratory.

Trial sites (1)

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