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[Dimensional accuracy and stability of the complete denture impression tray]
Nederlands Tijdschrift Voor Tandheelkunde
|August 1, 1989
Summary
Dimensional stability of denture tray materials is crucial. Thermoplastic acrylic showed the best stability after border molding, while shellac was unreliable, making it unsuitable for complete denture impressions.
Area of Science:
- Dental Materials Science
- Prosthodontics
Context:
- Accurate final impressions are essential for complete denture success.
- Tray material dimensional stability directly impacts impression accuracy and final denture fit.
- Evaluating traditional and newer tray materials is critical for improving clinical outcomes.
Purpose:
- To quantitatively assess the dimensional stability of three common denture tray materials: self-curing acrylic, thermoplastic acrylic, and shellac.
- To compare the dimensional changes of these materials before and after the border molding procedure.
- To determine the most dimensionally stable material for recording final impressions in complete denture fabrication.
Summary:
- Self-curing acrylic exhibited the highest contraction over time, followed by thermoplastic acrylic.
- Shellac showed the least initial dimensional change but proved highly unstable after border molding.
- Thermoplastic acrylic demonstrated superior dimensional stability post-border molding, indicating its reliability for complete denture impressions.
Impact:
- Findings guide clinicians in selecting the most dimensionally stable tray material for accurate complete denture impressions.
- Highlights the unsuitability of shellac for border molding due to significant dimensional instability.
- Thermoplastic acrylic emerges as a preferred material for ensuring the precision of final impressions, leading to improved denture function and patient satisfaction.