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Dent. J. 2017, 5(4), 30; https://doi.org/10.3390/dj5040030

Polishing of Monolithic Zirconia Crowns—Results of Different Dental Practitioner Groups

1
Department of Prosthodontics and Dental Technology, School of Dentistry, Witten/Herdecke University, Alfred-Herrhausen-Straße 44, 58455 Witten, Germany
2
Private Practice, 50670 Köln, Germany
3
Department of Biological and Material Sciences in Dentistry, School of Dentistry, Witten/Herdecke University, Alfred-Herrhausen-Straße 44, 58455 Witten, Germany
*
Author to whom correspondence should be addressed.
Received: 28 August 2017 / Revised: 30 October 2017 / Accepted: 31 October 2017 / Published: 14 November 2017
(This article belongs to the Special Issue Dental Materials)
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Abstract

This pilot study evaluates the surface roughness of monolithic zirconia crowns after chairside polishing by different dental practitioner groups. Four practitioner groups (group I: dental clinical students (n = 6); group II: dentists < 2 years post-qualification experience (n = 6); group III: dentists > 2 years post-qualification experience (n = 6) and group IV: dental technicians (n = 6)) were asked to polish two CAD/CAM-fabricated full-contour zirconia crowns (48 in total). A two-step zirconia polishing kit was used in both trials. The first trial (T1) was conducted without a time limitation. In the second trial (T2), the polish was restricted to 15 seconds for each polisher. Two blinded investigators (I1 and I2) analyzed the surface roughness (Ra) before and after polishing (Alicona measuring system). No statistically significant difference in surface roughness was found between the polishing results of the dental practitioner groups. Major difference in surface finish was achieved by dental technicians, with a median value of 25.4 nm (interquartile range 10.15–35.26 nm) for I1 in T1. The lowest difference was achieved by dental students, with a median value of Ra = 6.72 nm (interquartile range 4.7–17.9 nm) in T1. In T2, experienced dentists showed the highest difference in surface finish, with a median value of 41.35 nm (interquartile range 7.77–54.11). No significant correlation was found between polishing time and polishing results. The polishing of monolithic zirconium dioxide crowns can be performed with the present polishing set directly chairside after occlusal adjustment, regardless of the practitioner’s experience level. View Full-Text
Keywords: dental materials; monolithic zirconia; abrasion; ceramic; polishing; surface roughness dental materials; monolithic zirconia; abrasion; ceramic; polishing; surface roughness
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Kozmacs, C.; Hollmann, B.; Arnold, W.H.; Naumova, E.; Piwowarczyk, A. Polishing of Monolithic Zirconia Crowns—Results of Different Dental Practitioner Groups. Dent. J. 2017, 5, 30.

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