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Microleakage--full crowns and the dental pulp.
M Goldman1, P Laosonthorn, R R White
1Department of Endodontics, Tufts University School of Dental Medicine, Boston, MA 02111.
Journal of Endodontics
|October 1, 1992
Summary
Crown margin preparation impacts microleakage, potentially causing pulpal inflammation. Zinc phosphate cement showed significant leakage regardless of preparation type, highlighting risks for full crowns.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Prosthodontics
Background:
- Microleakage under full crowns is a concern, potentially leading to pulpal issues.
- Different crown margin preparations may influence cement seal quality.
Purpose of the Study:
- To evaluate the effect of three margin preparations (chamfer, shoulder, shoulder with bevel) on microleakage.
- To determine if margin preparation influences microleakage with zinc phosphate cement.
Main Methods:
- Three types of crown margin preparations were tested.
- All crowns were cemented using zinc phosphate cement.
- Microleakage was assessed using dye penetration after thermocycling.
Main Results:
- All tested crown margin preparations exhibited significant microleakage.
- Leakage followed the path of dentinal tubules toward the pulp.
- No significant difference in leakage was observed between preparation types.
Conclusions:
- Crown margin preparation type did not prevent microleakage with zinc phosphate cement.
- Microleakage may contribute to pulpal inflammation and necrosis under full crowns.
- Further research into improved cementation techniques is warranted.