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A Measurement Protocol for the Marginal and Internal Fit of All-Ceramic Crowns
N Abdulhameed1, J-F Roulet2, C Chen3
1PhD Student, Clinical Assistant Professor, University of Florida, College of Dentistry, Department of Restorative Dental Sciences, Center for Dental Biomaterials, 1395 Center Drive, Gainesville Fl 32608 USA.
The European Journal of Prosthodontics and Restorative Dentistry
|November 29, 2017
Summary
Additional firing negatively impacts the marginal and internal fit of all-ceramic lithium-disilicate crowns. While most discrepancies remained below 100 μm, firing exacerbated these gaps, affecting crown performance.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Ceramic Engineering
Background:
- All-ceramic restorations offer aesthetic advantages.
- Lithium-disilicate ceramics are widely used for crowns.
- Understanding factors affecting fit is crucial for clinical success.
Purpose of the Study:
- To investigate the in vitro effect of post-fabrication firing on the marginal and internal fit of lithium-disilicate all-ceramic crowns.
- To compare the fit of milled versus pressed and monolithic versus veneered lithium-disilicate crowns.
Main Methods:
- Sixty-four lithium-disilicate crowns (pressed and milled, monolithic and veneered) were fabricated.
- Crowns were cemented on dies, sectioned, and analyzed using a digital microscope.
- Marginal and internal discrepancies were measured at occlusal and axial surfaces.
Main Results:
- Marginal fit discrepancies were generally below 100 μm.
- Additional firing significantly increased both horizontal and vertical marginal discrepancies.
- Axial gap was influenced by material and firing, but not by fabrication design (milled vs. pressed).
Conclusions:
- Post-fabrication firing can compromise the marginal and internal fit of lithium-disilicate crowns.
- Clinical protocols should consider the impact of firing on restoration accuracy.
- Careful material selection and fabrication methods are essential for optimal crown fit.
