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The accuracy of six impression techniques for osseointegrated implants
M G Barrett1, W G de Rijk, J O Burgess
1Department of Restorative Dentistry, University of Texas Health Science Center San Antonio 78284-7912.
Summary
This study compared six dental impression techniques. Tapered impression copings showed a significant loss of accuracy, while square copings maintained accuracy across all tested techniques.
Area of Science:
- Dental materials science
- Prosthodontics
- Impression techniques
Background:
- Accurate dental impressions are crucial for fabricating well-fitting prostheses.
- Various impression techniques and materials are available, each with potential for distortion.
Purpose of the Study:
- To evaluate the accuracy of six impression techniques using both tapered and square impression copings.
- To determine if impression technique influences the dimensional accuracy of dental impressions.
Main Methods:
- Six impression techniques were assessed using tapered and square impression copings.
- Absolute distortion was measured using a cast metal impression tray with external fiduciary reference points.
- A travelling digitizing microscope measured x, y, and z coordinates on master casts and impressions.
Main Results:
- No significant differences in accuracy were found among the techniques when using square impression copings.
- A significant loss of accuracy, particularly in the z-axis, was observed with tapered impression copings.
Conclusions:
- The choice of impression coping shape (tapered vs. square) significantly impacts accuracy.
- Tapered impression copings may introduce greater distortion compared to square copings, affecting impression accuracy.