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A microstrain comparison of passively fitting screw-retained and cemented titanium frameworks.
Diego Klee de Vasconcellos1, Alberto Noriyuki Kojima1, Alfredo Mikail Melo Mesquita2
1Professor, Department of Dental Materials and Prosthodontics, Sao Paulo State University Dental School (UNESP), Sao José dos Campos, Brazil.
The Journal of Prosthetic Dentistry
|May 7, 2014
Summary
A passive fit procedure for dental implant frameworks significantly reduced peri-implant bone strain compared to standard machined frameworks. This technique minimizes damaging microstrain, promoting better healing and implant stability.
Area of Science:
- Biomaterials Science
- Dental Implantology
- Biomechanics
Background:
- Imprecise fit in dental implant frameworks increases strain on peri-implant bone.
- This can impede healing and lead to microgap formation, compromising implant success.
Purpose of the Study:
- To compare microstrain in screw-retained frameworks with and without a passive fit procedure.
- Investigate the efficacy of a cementing technique to correct framework misfit.
Main Methods:
- Four implants were placed in a polyurethane block.
- Ten titanium frameworks were divided into two groups: standard machined (STF) and passive fit (CTF).
- Strain gauges measured microstrain under simulated loading conditions, analyzed via Student t test.
Main Results:
- The passive fit group (CTF) exhibited significantly lower mean microstrain (844 mε) than the standard machined group (STF) (2517 mε).
- P<.05 indicated a statistically significant difference.
Conclusions:
- Passive fit fabrication significantly reduces interframework strain compared to prefabricated machined frameworks.
- This technique is beneficial for complete-arch implant frameworks under load.
