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Journal of Prosthetic Dentistry

Evaluation of marginal and internal fit of lithium disilicate CAD-CAM crowns with different finish lines by using a micro-CT technique

  • Maria Rizonaki
    Affiliations
    Postgraduate student, Postgraduate Reconstructive Dentistry, Department of Reconstructive Dentistry, Dental School, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
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  • Wolfgang Jacquet
    Affiliations
    Professor, Oral Health Research Group ORHE, Faculty of Medicine and Pharmacy, VUB Vrije Universiteit Brussel, Brussels, Belgium

    Professor, Department of Special Needs in Oral Health, Dental School, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
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  • Peter Bottenberg
    Affiliations
    Professor, Department of Oral Health Sciences, Dental School, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium

    Professor, Department of Educational Sciences EDWE-LOCI, Faculty of Psychology and Educational Sciences, VUB Vrije Universiteit Brussel, Brussels, Belgium
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  • Lennert Depla
    Affiliations
    Undergraduate student, Master of Science in Dentistry, Dental School, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
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  • Matthieu Boone
    Affiliations
    Professor, Department of Physics and Astronomy, Ghent University, Ghent, Belgium
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  • Peter J. De Coster
    Correspondence
    Corresponding author: Dr Peter J. De Coster, Department of Reconstructive Dentistry, Dental School, Ghent University, Ghent University Hospital, Suite P8.1.211, 10 Corneel Heymanslaan, 9000 Ghent, BELGIUM
    Affiliations
    Professor, Department of Reconstructive Dentistry, Dental School, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
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Published:February 02, 2021DOI:https://doi.org/10.1016/j.prosdent.2020.11.027

      Abstract

      Statement of problem

      Whether the precision of fit of computer-aided design and computer-aided manufacturing (CAD-CAM) complete crowns is affected by the finish line configuration is unclear.

      Purpose

      The purpose of this in vitro study was to evaluate the marginal and internal fit of CAD-CAM ceramic crowns made from lithium disilicate based on 3 different finish lines (rounded shoulder, chamfer, feather-edge).

      Materials and methods

      Thirty anterior lithium disilicate complete crowns (n=10 per finish line group) were fabricated by following a completely digital workflow based on digital scans made with the TRIOS scanner. The crowns were adhesively cemented on duplicate dies of the respective prepared Typodont teeth, and the marginal gap, absolute marginal discrepancy, and internal gap were evaluated by using microcomputed tomography (μCT). A total of 66 values were obtained for each specimen from sagittal and transaxial sections, and a rendering software program was used to calculate the volume of the cement gap for each specimen by means of 3D region growing. Two-way ANOVA, Tukey post hoc tests with Bonferroni correction, and the Kruskal-Wallis test were used to compare the values between the experimental groups (α=.05).

      Results

      Marginal gap and absolute marginal discrepancy values were statistically significantly different between groups. In ascending order, marginal gap values were 23 ±14 μm for rounded shoulder, 54 ±28 μm for chamfer, and 96 ±36 μm for feather-edge finish lines. Absolute marginal discrepancy values were 96 ±34 μm for rounded shoulder, 124 ±37 μm for chamfer, and 157 ±34 μm for feather-edge finish lines. Internal gap values were 111 ±14 μm for feather-edge, 136 ±22 μm for chamfer, and 168 ±25 μm for rounded shoulder finish lines. The differences in cement volume between groups were not statistically significant (P=.200).

      Conclusions

      All 3 finish lines produced marginal gaps within the range of clinically accep table values. Lithium disilicate CAD crowns with a rounded shoulder finish line had the best marginal fit but the poorest internal fit, and lithium disilicate CAD crowns with a feather-edge finish line had the best internal fit but the poorest marginal fit.
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