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A Study on Topographical Properties and Surface Wettability of Monolithic Zirconia after Use of Diverse Polishing Instruments with Different Surface Coatings


Al-Haj Husain, Nadin; Özcan, Mutlu (2018). A Study on Topographical Properties and Surface Wettability of Monolithic Zirconia after Use of Diverse Polishing Instruments with Different Surface Coatings. Journal of Prosthodontics, 27(5):429-442.

Abstract

PURPOSE
To investigate the surface topography parameters and wettability of monolithic zirconia (MZ) using polishing instruments with different coatings.

MATERIALS AND METHODS
MZ specimens (N = 50, n = 10 per group) (12 × 12 × 1.8 mm ) were highly polished. Five polishing systems were studied: BG: silicon carbide polishers; CG: diamond-impregnated ceramic polisher kit; EV: synthetically bonded grinder interspersed with diamond; SL: urethane-coated paper with aluminum oxide grits; and DB: diamond bur (8 μm). Specimens were initially roughened with 220 μm grit diamond burs (10 seconds, 160,000 rpm). After baseline measurements, they were further polished for 10 seconds using a slow-speed handpiece under water coolant, except for SL using a custom-made device (7.5 N), with speed ranging between 5000 and 30,000 rpm. Topographical changes were evaluated considering (a) weight (digital scale), (b) volume loss (digital microscope), (c) vertical height loss (digital microscope), (d) surface roughness (Ra) (profilometer), and (e) surface wettability (goniometer, water).

RESULTS
Compared to baseline, material loss from the surface after polishing (ΔW) ranged between 0.00 ± 0.0001×10 and -0.03 ± 0.008×10 g (SL < CG < BG < DB < EV ) and the volume loss (ΔV) between 900 ± 3×10 and 2459 ± 7×10 μm (SL < BG < CG < DB < EV ). The vertical height loss (∆VH) was highest for SL (-18.911 ± 3.5) and lowest for EV 55.19 ± 6.3 μm (SL < BG < CG < DB < EV ). The surface roughness (μm) difference (∆Ra) was lowest for DB (-0.14 ± 0.02) and the highest for EV (0.86 ± 0.42) (DB < BG < SL < CG < EV ). BG showed the lowest contact angle difference (∆SW) -2.79 ± 0.8° and EV the highest (3.93 ± 3.1°) (BG < DB < SL < CG < EV ).

CONCLUSIONS
All polishing instruments performed similarly when ∆Ra values were considered. SL, BG, and CG produced the least material loss. Synthetically bonded rubber bur interspersed with diamond (EV) could not be suggested for polishing MZ.

Abstract

PURPOSE
To investigate the surface topography parameters and wettability of monolithic zirconia (MZ) using polishing instruments with different coatings.

MATERIALS AND METHODS
MZ specimens (N = 50, n = 10 per group) (12 × 12 × 1.8 mm ) were highly polished. Five polishing systems were studied: BG: silicon carbide polishers; CG: diamond-impregnated ceramic polisher kit; EV: synthetically bonded grinder interspersed with diamond; SL: urethane-coated paper with aluminum oxide grits; and DB: diamond bur (8 μm). Specimens were initially roughened with 220 μm grit diamond burs (10 seconds, 160,000 rpm). After baseline measurements, they were further polished for 10 seconds using a slow-speed handpiece under water coolant, except for SL using a custom-made device (7.5 N), with speed ranging between 5000 and 30,000 rpm. Topographical changes were evaluated considering (a) weight (digital scale), (b) volume loss (digital microscope), (c) vertical height loss (digital microscope), (d) surface roughness (Ra) (profilometer), and (e) surface wettability (goniometer, water).

RESULTS
Compared to baseline, material loss from the surface after polishing (ΔW) ranged between 0.00 ± 0.0001×10 and -0.03 ± 0.008×10 g (SL < CG < BG < DB < EV ) and the volume loss (ΔV) between 900 ± 3×10 and 2459 ± 7×10 μm (SL < BG < CG < DB < EV ). The vertical height loss (∆VH) was highest for SL (-18.911 ± 3.5) and lowest for EV 55.19 ± 6.3 μm (SL < BG < CG < DB < EV ). The surface roughness (μm) difference (∆Ra) was lowest for DB (-0.14 ± 0.02) and the highest for EV (0.86 ± 0.42) (DB < BG < SL < CG < EV ). BG showed the lowest contact angle difference (∆SW) -2.79 ± 0.8° and EV the highest (3.93 ± 3.1°) (BG < DB < SL < CG < EV ).

CONCLUSIONS
All polishing instruments performed similarly when ∆Ra values were considered. SL, BG, and CG produced the least material loss. Synthetically bonded rubber bur interspersed with diamond (EV) could not be suggested for polishing MZ.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic of Reconstructive Dentistry
Dewey Decimal Classification:610 Medicine & health
Scopus Subject Areas:Health Sciences > General Dentistry
Language:English
Date:June 2018
Deposited On:25 Jan 2019 16:08
Last Modified:29 Jul 2020 09:25
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:1059-941X
Additional Information:This is the peer reviewed version of the following article: Journal of Prosthodontics, 27: 429-442, which has been published in final form at https://doi.org/10.1111/jopr.12515. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. (http://www.wileyauthors.com/self-archiving)
OA Status:Green
Publisher DOI:https://doi.org/10.1111/jopr.12515
PubMed ID:27469615

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