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Endodontic access of all-ceramic crowns
J K Sutherland1, P E Teplitsky, M B Moulding
1Department of Restorative and Prosthetic Dentistry, University of Saskatoon, Canada.
The Journal of Prosthetic Dentistry
|February 1, 1989
Summary
Creating endodontic access openings in all-ceramic Dicor crowns often leads to damage. Most crowns experienced chipping, with some fracturing or developing craze lines, especially when using carbide instruments.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Endodontics
Background:
- All-ceramic restorations are widely used in dentistry.
- The integrity of these restorations after endodontic access is crucial for long-term success.
- Dicor crowns are a type of all-ceramic material.
Purpose of the Study:
- To evaluate the effects of endodontic access opening preparation on Dicor all-ceramic crowns.
- To assess the types and prevalence of damage incurred during access preparation.
- To compare the impact of different instrumentation types on crown integrity.
Main Methods:
- Forty-two extracted human teeth received Dicor all-ceramic crowns.
- Endodontic access openings were prepared using standard criteria.
- Crowns were examined post-preparation using direct vision, transillumination, stereomicroscopy, and scanning electron microscopy.
- Diamond and carbide burs were used for access preparation.
Main Results:
- Two crowns fractured during access preparation.
- Seven crowns exhibited craze lines.
- Twenty-nine crowns showed ceramic chipping adjacent to the access opening.
- Carbide instrumentation resulted in more fractures and craze lines than diamond instrumentation.
- No significant difference in chipping extent was observed between diamond and carbide burs.
Conclusions:
- Endodontic access preparation poses a significant risk of damage to Dicor all-ceramic crowns.
- Chipping is the most common form of damage, followed by craze lines and fractures.
- Carbide instrumentation appears to be more detrimental than diamond instrumentation regarding fractures and craze lines.