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Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
Accuracy of four transfer impression techniques for dental implants: a scanning electron microscopic analysis
Elcio Yamamoto1, Juliana Marotti, Tomie Toyota de Campos
1Department of Prosthodontics, School of Dentistry, University of Sao Paulo, Sao Paulo, Brazil.
The International Journal of Oral & Maxillofacial Implants
|January 4, 2011
Summary
Splinting impression copings improves accuracy for dental implants. Techniques using irreversible hydrocolloid were least accurate, while polyvinyl siloxane with splinting showed the best results.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Accurate impressions are crucial for fabricating well-fitting prostheses on osseointegrated implants.
- Traditional impression techniques can introduce inaccuracies due to material properties and handling.
Purpose of the Study:
- To evaluate the accuracy of four impression techniques for osseointegrated implants using scanning electron microscopy (SEM).
- To compare irreversible hydrocolloid and polyvinyl siloxane (PVS) impression materials, with and without acrylic resin splinting.
Main Methods:
- A master model with implant analogs was used as a standard.
- Four groups were analyzed: irreversible hydrocolloid only (IH), IH with splinting (IHS), PVS only (P), and PVS with splinting (PS).
- SEM was used to measure marginal gaps between abutments and implant analogs.
Main Results:
- The irreversible hydrocolloid (IH) technique showed the largest misfit.
- Splinted impression copings resulted in smaller marginal gaps compared to indexed techniques.
- No significant difference in accuracy was found between IHS, P, and PS techniques compared to the reference, though PS demonstrated lower standard deviation.
Conclusions:
- The irreversible hydrocolloid impression technique is the least accurate.
- Splinted impression copings enhance the accuracy of casts, regardless of the impression material used.
- PVS with splinting (PS) showed promising results with high accuracy and consistency.
