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Determining the accuracy of stock and custom tray impression/casts
P Millstein1, A Maya, C Segura
1Department of Restorative Dentistry, School of Medicine, Tufts Univerity, Boston, MA, USA.
Journal of Oral Rehabilitation
|October 22, 1998
Summary
Custom trays provide more accurate dental casts than stock trays. This study found custom trays offer superior consistency and reproduction for polysiloxane impressions.
Area of Science:
- Dental materials science
- Prosthodontics
- Impression techniques
Background:
- Accurate dental casts are crucial for fabricating prosthetics.
- Impression materials and trays influence cast accuracy.
- Polysiloxane is a common elastomeric impression material.
Purpose of the Study:
- To compare the accuracy of dental casts made from stock trays versus custom trays.
- To evaluate the consistency of cast reproduction using polysiloxane impression material with different tray types.
Main Methods:
- Dental impressions were made using both stock and custom trays with polysiloxane material.
- Casts were fabricated from these impressions.
- Dimensional accuracy and consistency of the casts were analyzed.
Main Results:
- All fabricated casts exhibited some degree of distortion.
- Casts derived from custom trays demonstrated higher accuracy compared to stock trays.
- Custom tray impressions yielded more consistent results in cast reproduction.
Conclusions:
- Custom trays are recommended over stock trays for improved accuracy in dental impressions.
- The choice of impression tray significantly impacts the fidelity of the resulting dental cast.
- Optimizing impression techniques is essential for predictable prosthetic outcomes.