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Strain analysis in posterior implant-supported fixed dental prostheses - cemented compared to screwed: An in vitro
Sarit Naishlos1, Joseph Nissan2, Asaf Shely2
1Department of Pediatric Dentistry, Tel Aviv University, Israel.
Dental and Medical Problems
|July 20, 2026
Summary
Cement-retained restorations reduce implant neck strain compared to screw-retained ones. Single crowns also showed less strain, indicating a preference for cement retention and single-unit designs to minimize stress on dental implants.
Area of Science:
- Biomaterials Science
- Dental Implantology
- Biomechanics
Background:
- Excessive strain at the implant neck is linked to technical and biological complications.
- Etiology of implant neck strain requires further investigation.
Purpose of the Study:
- Compare strain at the implant neck between cement-retained and screw-retained restorations.
- Evaluate strain differences among three prosthesis designs (single crowns, splinted restorations, simple bridges).
Main Methods:
- In vitro strain gauge analysis on six prosthetic configurations (cement-retained and screw-retained).
- Two strain gauges per implant neck, subjected to a 200 N vertical load.
- Statistical analysis using ANOVA and Scheffé's post hoc tests.
Main Results:
- Cement-retained restorations consistently showed significantly less cervical strain than screw-retained ones (p < 0.001).
- Single crowns exhibited significantly lower strain transfer compared to splinted restorations and simple bridges in both retention groups (p < 0.001).
Conclusions:
- Cement-retained implant-supported fixed prostheses minimize strain at the implant neck under high occlusal loads.
- Splinting restorations does not inherently reduce strain at the implant neck.
