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The effect of cement volume on crown seating
1Institute of Dental Health, Ministry of Health, Republic of Singapore.
The International Journal of Prosthodontics
|September 1, 1996
Summary
Minimizing luting cement volume significantly improves complete crown seating. A thin, brushed-on layer of zinc phosphate cement resulted in the smallest vertical discrepancies for dental crowns.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Complete crown cementation is crucial for restoration longevity.
- Inadequate seating can lead to marginal discrepancies and secondary caries.
- The influence of cement volume on complete crown seating requires further investigation.
Purpose of the Study:
- To evaluate the effect of varying cement volumes on the vertical seating accuracy of complete crowns.
- To compare the seating discrepancies associated with different cement application methods.
Main Methods:
- An in vitro study utilizing a nickel-chromium replica mounted in a cementation jig.
- Complete crowns were luted with zinc phosphate cement using three distinct volumes: completely filled, half filled, and brushed on.
- Seating was assessed under static and dynamic (1,500 Hz) loads using a linear variable differential transducer.
Main Results:
- Significant differences in mean vertical discrepancies were observed across cement volumes (P < .0005).
- The 'brushed on' cement volume yielded the smallest mean vertical discrepancy (27.4 +/- 7.2 microns).
- Completely filled and half-filled volumes showed substantially larger discrepancies (90.0 +/- 15.2 and 42.1 +/- 8.6 microns, respectively).
Conclusions:
- A thinly applied layer of luting cement optimizes complete crown seating.
- Reducing cement volume is a key factor in minimizing vertical discrepancies during cementation.
- Clinical recommendations should emphasize minimal cement application for improved crown fit.