Related Experiment Videos
The three-dimensional effects of adjustment and cementation on crown seating
1Department of Restorative Dentistry, School of Dentistry, University of Southern California, Los Angeles.
The International Journal of Prosthodontics
|May 1, 1993
Summary
Crown fit involves three-dimensional accuracy. Adjustments improve crown fit by reducing tilting, while cementation can increase it. Resin cements cause significantly more tilting than other tested cements.
Area of Science:
- Dental materials science
- Prosthodontics
- Biomaterials engineering
Background:
- Accurate crown fit is crucial for long-term restoration success.
- Understanding the three-dimensional aspects of crown fit is essential.
- The influence of adjustment and luting agents on crown fit requires further investigation.
Purpose of the Study:
- To investigate the three-dimensional nature of complete-coverage crown fit.
- To evaluate the effects of adjustment procedures on crown fit.
- To assess the impact of different luting agents on crown tilting.
Main Methods:
- Standardized preparations were made on extracted premolars.
- Complete-coverage castings were fabricated using base metal alloy.
- Measurements of crown tilting were taken before and after adjustment and cementation with various luting agents.
Main Results:
- Casting adjustment significantly decreased crown tilting.
- Cementation of castings generally increased tilting.
- Resin cements resulted in significantly greater tilting compared to zinc phosphate, glass-ionomer, and polycarboxylate cements.
Conclusions:
- Adjustments are effective in improving the three-dimensional fit of crowns.
- The choice of luting agent significantly impacts crown fit, with resin cements showing poorer performance regarding tilting.
- Clinical recommendations for luting agents should consider their effect on crown fit accuracy.