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A comparison of an accelerated technique for casting post-and-core restorations with conventional techniques
W V Campagni1, M H Reisbick, M Jugan
1Allegheny General Hospital, Pittsburgh, PA.
Summary
This study found that ferruled castings had clinically unacceptable fit. For non-ferruled castings, a gypsum investment without a ring liner offered the best fit compared to accelerated or other traditional techniques.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Casting Technology
Background:
- Accurate casting fit is crucial for the success of post-and-core restorations.
- Traditional casting techniques can be time-consuming and may affect the dimensional stability of patterns.
Purpose of the Study:
- To compare an accelerated casting technique with four traditional methods for post-and-core restorations.
- To evaluate the impact of ferrule use on casting fit.
- To assess the dimensional accuracy of patterns and final castings.
Main Methods:
- Six groups of castings were fabricated using different investment materials and burnout procedures.
- Patterns were evaluated for fit at 2 weeks and 3 months.
- Casting fit was compared to pattern fit, with subgroups for ferruled and non-ferruled preparations.
Main Results:
- Pattern fit degraded over 3 months.
- Ferruled castings exhibited significantly worse seating than non-ferruled castings.
- The difference between casting and pattern seating was clinically unacceptable for ferruled restorations.
Conclusions:
- Ferruled castings demonstrated clinically unacceptable fit across all techniques.
- For non-ferruled castings, a gypsum investment without a ring liner yielded the best fit.
- The accelerated technique showed intermediate seating accuracy, significantly worse than the best groups.