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Ceramic molar crown reproducibility by digital workflow manufacturing: An in vitro study
Ii-Do Jeong1, Woong-Chul Kim2, Jinyoung Park2
1Institute for Health Science, Korea University, Seoul, Republic of Korea.
The Journal of Advanced Prosthodontics
|September 7, 2017
Summary
Digital workflow enhances zirconia crown reproducibility more than lithium disilicate. This study compared the fit of CAD/CAM-manufactured zirconia and lithium disilicate single crowns, finding zirconia superior in accuracy.
Area of Science:
- Dental materials science
- Digital dentistry
- CAD/CAM manufacturing
Background:
- Digital workflows are increasingly used for dental restorations.
- Assessing the reproducibility of different ceramic materials in digital manufacturing is crucial for clinical success.
Purpose of the Study:
- To compare the manufacturing reproducibility of zirconia and lithium disilicate single crowns produced via a digital workflow.
- To quantitatively analyze discrepancies in fit for both ceramic materials.
Main Methods:
- Twelve zirconia and twelve lithium disilicate crowns were fabricated using CAD/CAM technology from digital impressions.
- Crown reproducibility was assessed using 3D inspection software, measuring mean quadratic deviations (RMS).
- Statistical analysis was performed using Student's t-test.
Main Results:
- Zirconia crowns exhibited lower mean RMS values on the outer surface (18.6 µm) compared to lithium disilicate crowns (29.2 µm).
- A statistically significant difference in reproducibility was found on the outer surface between the two materials (P<.001).
- Specific contouring discrepancies were noted for both materials on outer and inner surfaces.
Conclusions:
- Digital workflow-based manufacturing demonstrates superior reproducibility for zirconia single crowns compared to lithium disilicate single crowns.
- Zirconia may offer enhanced marginal and overall fit accuracy in digitally fabricated restorations.
