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The effect of recementation on crown retention
M F Ayad1, S F Rosenstiel, J B Woelfel
1Section of Restorative Dentistry, Prosthodontics, and Endodontics, University of Tanta College of Dentistry, Egypt.
The International Journal of Prosthodontics
|August 26, 1998
Summary
Adhesive resin and glass-ionomer cements offer superior retention for complete cast crowns compared to zinc phosphate cement. Recemented crowns with zinc phosphate showed significantly reduced retention, highlighting the importance of cement choice for long-term dental restoration success.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Complete cast crowns are crucial for restoring damaged molars.
- Luting cement selection significantly impacts crown retention and longevity.
- Understanding the retentive capacity of different cements is vital for clinical success.
Purpose of the Study:
- To evaluate the retention of complete cast crowns cemented with zinc phosphate, adhesive resin, and glass-ionomer cements.
- To compare the retentive strength of initially cemented crowns versus recemented crowns.
Main Methods:
- Standardized complete cast crowns were fabricated on extracted human molar teeth.
- Crowns were cemented with zinc phosphate, adhesive resin (Panavia-EX), or glass-ionomer (Ketac-Cem) cements.
- Tensile force required for dislodgement was measured after thermocycling; crowns were then recemented and re-tested.
Main Results:
- Adhesive resin (Panavia-EX) and glass-ionomer cements demonstrated the highest initial retention.
- Zinc phosphate cement exhibited significantly lower retention compared to the other two cements (P < 0.05).
- Recemented zinc phosphate crowns showed significantly reduced retention compared to their initial cementation (P < 0.05).
Conclusions:
- Adhesive resin and glass-ionomer cements provide superior retentive strength for complete cast crowns.
- Zinc phosphate cement shows lower initial and significantly diminished recementation retention.
- Cement choice is critical for ensuring the long-term stability of cast crown restorations.