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Technique for Spacer Adaptation and Custom Tray Fabrication in Impression Making for Fixed Prosthodontics
Aditi Nanda1, Dheeraj Kumar Koli1, Harsimran Kaur2
1Department of Prosthodontics, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India.
Contemporary Clinical Dentistry
|November 8, 2024
Summary
This study introduces a technique using vacuum-adapted spacers and custom trays to reduce inaccuracies in two-step dental impressions. This method homogenizes polymerization shrinkage for better-fitting prostheses.
Area of Science:
- Dental Materials Science
- Prosthodontics
Background:
- Two-step impressions are crucial for fabricating fixed prostheses.
- Inaccuracies in impression materials can lead to ill-fitting restorations.
- Polymerization shrinkage of elastomeric impression materials is a significant source of error.
Purpose of the Study:
- To minimize inaccuracies in two-step impressions.
- To homogenize the polymerization shrinkage of elastomeric impression materials.
- To improve the fit of fixed prostheses.
Main Methods:
- A technique involving vacuum-adapted spacers and custom tray fabrication for two-step impressions.
- Utilizing two vacuum-adapted spacers selected based on impression material viscosity.
- Employing a vacuum-adapted custom tray for impression making.
Main Results:
- Consistent thickness of different viscosity elastomeric impression materials is maintained.
- Homogenization of polymerization shrinkage across impression regions.
- Minimized dimensional changes in the custom tray material.
Conclusions:
- The described technique effectively minimizes inaccuracies in two-step impressions.
- Homogenizing polymerization shrinkage leads to improved dimensional stability.
- This method promises a well-fitting prosthesis by reducing impression errors.
