Digital microscopic evaluation of vertical marginal discrepancies of CAD/CAM fabricated zirconia cores
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Syed Rashid Habib
Abstract
Objective:
The aim of this in vitro research study was to evaluate the vertical marginal discrepancies of zirconia (Zr) cores fabricated by five different computer-aided design and manufacturing (CAD/CAM) systems using a digital microscope.
Materials and methods:
A total of 60 specimens were prepared and randomly divided into five groups (n=12 each) using the following systems: Ceramill Motion 2 (CM, Amanngirrbach, Germany); Weiland (WI, Ivoclar Vivadent, USA); Cerec (CS, Sirona Dental, USA); Zirkonzahn (ZZ, Gmbh Bruneck, Italy) and Cad4dent (CD, Canada). The specimens were numbered and the vertical marginal discrepancies were evaluated with a digital microscope at 50× magnification.
Results:
A one-way analysis of variance showed a statistically significant difference (p=0.002) between the groups. The CM group exhibited the lowest values for the marginal gaps (31.30±15.12 μm), while the ZZ group exhibited the highest values for the marginal gaps (44.83±28.76 μm) compared to other groups. A post hoc Tukey’s test for multiple comparisons between the experimental groups showed a statistically significant difference (p<0.05) between the group CM and group CD with group ZZ. The rest of the groups showed no significant differences between them. Variations in the values were observed for the four sites measured with the highest and the least mean marginal gap value of 43.19±23.84 μm and 32.49±12.21 μm for buccal and lingual sites, respectively.
Conclusion:
Variations existed in the marginal discrepancy values for the CAD/CAM systems investigated in the study. Vertical marginal discrepancy values observed for various systems investigated in the study were well within the clinically acceptable range.
Acknowledgments
The author is thankful to Mr. Bong for his help with the digital microscope measurements.
Author Statement
Research funding: The research project was approved and supported by the College of Dentistry Research Center (CDRC) and deanship of scientific research at King Saud University (Registration # FR 0404).
Conflict of interest: Author state no conflict of interest.
Informed consent: Informed consent is not applicable.
Ethical approval: The study was conducted at the Department of Prosthetic Dental Sciences/College of Dentistry Research Center, College of Dentistry, King Saud University and approved by the ethical committee of College of Dentistry Research Center (FR 0404).
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©2019 Walter de Gruyter GmbH, Berlin/Boston
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Articles in the same Issue
- Frontmatter
- Review
- The peripheral cannulas in extracorporeal life support
- Research articles
- Determination of optimal positive end-expiratory pressure based on respiratory compliance and electrical impedance tomography: a pilot clinical comparative trial
- Simulation of personalised haemodynamics by various mounting positions of a prosthetic valve using computational fluid dynamics
- Recovery of signal loss adopting the residual bootstrap method in fetal heart rate dynamics
- Optimal level and order detection in wavelet decomposition for PCG signal denoising
- Simple gastric motility assessment method with a single-channel electrogastrogram
- Analysis of on-surface and in-air movement in handwriting of subjects with Parkinson’s disease and atypical parkinsonism
- Wavelet-enhanced convolutional neural network: a new idea in a deep learning paradigm
- Digital microscopic evaluation of vertical marginal discrepancies of CAD/CAM fabricated zirconia cores
- Modelling the degree of porosity of the ceramic surface intended for implants
- How Hedstrom files fail during clinical use? A retrieval study based on SEM, optical microscopy and micro-XCT analysis
- A novel measurement strategy to evaluate the human head as a transition medium for inductive ear-to-ear communication
- Short communication
- Force plates may be used for dynamic analyses of endoprostheses explantation procedures
