Assessment of Tooth Preparations Submitted to Dental Laboratories for Fabrication of Monolithic Zirconia Crowns
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Department of Restorative Dentistry, University at Buffalo School of Dental Medicine, Buffalo, NY 14214, USA
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Department of Prosthodontics, University at Texas Health Science Center, San Antonio, TX 77030, USA
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Department of General Dentistry, New York University Langone Dental Medicine, Nashville, TN 37011, USA
4
Department of Pediatric Dentistry, University at Buffalo School of Dental Medicine, Buffalo, NY 14214, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Amirali Zandinejad
Dent. J. 2021, 9(10), 112; https://doi.org/10.3390/dj9100112
Received: 26 August 2021
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Revised: 22 September 2021
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Accepted: 26 September 2021
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Published: 27 September 2021
(This article belongs to the Special Issue Advanced Ceramics, Additive Manufacturing, and Technologies in Dentistry)
Purpose: The objective of this study was to assess the quality of posterior teeth prepared for monolithic zirconia crowns. Materials and Methods: A total of 392 STL-files of posterior preparations for monolithic zirconia crowns were evaluated in this study. Three-dimensional (3D) images were evaluated using a software (3D Viewer; 3Shape A/S, Copenhagen, Denmark) for finish line design, finish line width, occluso-cervical dimension, total occlusal convergence (TOC), intercuspal angulation, finish line quality, line angle form, and presence or absence of undercut at the axial wall and unsupported lip of enamel. The assessment was performed by two calibrated evaluators. Then, data were descriptively analyzed. Data for occluso-cervical dimension and TOC were descriptively analyzed according to their location. Results: Thirty-nine percent of premolars, 77% of first molars, and 91% of second molars had an average occluso-cervical dimension of less than 3 mm (premolars) and 4 mm (molars), with most of the preparations having a TOC of more than 20 degrees. More than 50% of preparations had undercut, unsupported enamel and/or unacceptable finish line quality. Conclusions: The quality of tooth preparation including finish line quality, absence of unsupported enamel and undercut at the axial wall should be evaluated when preparing monolithic zirconia crowns.
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Keywords:
CAD-CAM; quality of tooth preparation; monolithic zirconia
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MDPI and ACS Style
Sadid-Zadeh, R.; Sahraoui, H.; Lawson, B.; Cox, R. Assessment of Tooth Preparations Submitted to Dental Laboratories for Fabrication of Monolithic Zirconia Crowns. Dent. J. 2021, 9, 112. https://doi.org/10.3390/dj9100112
AMA Style
Sadid-Zadeh R, Sahraoui H, Lawson B, Cox R. Assessment of Tooth Preparations Submitted to Dental Laboratories for Fabrication of Monolithic Zirconia Crowns. Dentistry Journal. 2021; 9(10):112. https://doi.org/10.3390/dj9100112
Chicago/Turabian StyleSadid-Zadeh, Ramtin, Hadjer Sahraoui, Brian Lawson, and Robert Cox. 2021. "Assessment of Tooth Preparations Submitted to Dental Laboratories for Fabrication of Monolithic Zirconia Crowns" Dentistry Journal 9, no. 10: 112. https://doi.org/10.3390/dj9100112
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