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Evaluation of three impression techniques for osseointegrated oral implants
J A Inturregui1, S A Aquilino, J S Ryther
1Department of Prosthodontics, University of Iowa College of Dentistry, Iowa City.
The Journal of Prosthetic Dentistry
|May 1, 1993
Summary
Polyether impressions provide the most accurate gypsum casts for osseointegrated implant prostheses. While no technique ensured a perfect fit, polyether alone offered the closest duplication of the master cast, crucial for dental implant fabrication.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Accurate fabrication of osseointegrated implant prostheses relies on precise dental impressions.
- The choice of impression material can influence the dimensional accuracy of the resulting gypsum casts.
- Evaluating impression materials is critical for achieving passive fit in implant-supported restorations.
Purpose of the Study:
- To compare the accuracy of gypsum casts made using three different impression techniques for osseointegrated implant prostheses.
- To determine which impression material (polyether, polyether with impression plaster, or polyether with acrylic resin) yields the most accurate cast.
- To assess the passivity of fit of implant frameworks fabricated on casts produced by these techniques.
Main Methods:
- In vitro investigation using three impression techniques: polyether alone, polyether with impression plaster, and polyether with acrylic resin.
- Fabrication of gypsum casts from impressions obtained via the tested techniques.
- Attachment of strain gauges to a master framework to measure the passivity of fit on sample casts.
- Statistical analysis using one-way analysis of variance and Duncan's multiple range test to compare strain values.
Main Results:
- A statistically significant difference (p < 0.05) was observed between the three impression techniques regarding cast accuracy.
- None of the tested impression techniques produced an absolutely passive framework fit.
- The polyether impression material alone resulted in the closest duplication of the master cast compared to combinations with impression plaster or acrylic resin.
Conclusions:
- Polyether impression material, when used alone, offers superior accuracy for fabricating gypsum casts for osseointegrated implant prostheses compared to combinations with impression plaster or acrylic resin.
- Achieving an absolutely passive fit for implant frameworks remains a challenge, irrespective of the impression technique used.
- The findings suggest that polyether alone is the preferred material for maximizing accuracy in implant prosthesis fabrication based on this in vitro study.