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In vitro comparison of master cast accuracy for single-tooth implant replacement
P Vigolo1, Z Majzoub, G Cordioli
1University of Padova, Padova, Italy.
The Journal of Prosthetic Dentistry
|May 4, 2000
Summary
Modifying impression copings by sandblasting and applying adhesive significantly improved the accuracy of master casts for single-tooth implants. This enhanced precision in dental impressions leads to better final crown fit.
Area of Science:
- Dental materials science
- Prosthodontics
- Biomaterials
Background:
- Inaccurate transfer of implant hex positions to working casts can lead to discrepancies in occlusal and interproximal contacts of single-tooth crowns.
- This inaccuracy poses a clinical challenge in achieving precise restorations.
Purpose of the Study:
- To evaluate the accuracy of master casts for single-tooth replacements using square pick-up impression copings.
- To compare the accuracy of manufacturer-supplied copings versus modified copings (sandblasted and adhesive-coated).
Main Methods:
- An in vitro study using a resin model with a standard single implant.
- Twenty impressions were made with non-modified copings and 20 with modified copings.
- Master casts were analyzed for rotational position changes of the implant replica's hexagon.
Main Results:
- Master casts from modified impression copings showed significantly less variability in hexagonal rotational position changes.
- Modified copings demonstrated superior precision compared to non-prepared copings.
Conclusions:
- Adhesive-coated impression copings significantly improved the precision of dental impressions.
- This modification offers a method to enhance the accuracy of master casts in implant dentistry.