Journal article
Wear Behavior of Graded Glass/Zirconia Crowns and Their Antagonists
Journal of dental research, Vol.98(4), pp.437-442
04/01/2019
DOI: 10.1177/0022034518820918
PMCID: PMC6429669
PMID: 30744472
Abstract
Monolithic zirconia crowns have become very popular; their surface finish is considered a key factor for restoration longevity. While polishing has shown excellent results in vivo, the surface glass infiltration of zirconia may offer superior damage resistance and aesthetic advantages by using tooth-colored glasses. Thus, the purpose of this study is to evaluate the efficacy of polishing and glass infiltration on the wear behavior of monolithic zirconia crowns. The wear behavior of intact natural molar teeth was investigated as a reference. Zirconia crowns were divided into 3 groups: PolZ-sintered then polished; PolGZ-polished in the presintered state and then glass infiltrated and sintered; NoPolGZ-as machined, glass infiltrated and sintered. Crowns were adhesively bonded to a dentin-like abutment. Zirconia crowns and molar teeth ( n = 15) were subjected to contact-slide-liftoff cyclic loading (200 N, 1.25 million cycles) with a steatite sphere ( r = 3 mm) as an antagonist in water. Surface and subsurface damages were investigated with optical and scanning electron microscopies. Wear depth and volume loss were determined with micro-computed tomography. PolGZ and NoPolGZ crowns exhibited shallow wear scars, where material loss remained within the glass/zirconia layer with no visible cracks. Meanwhile, PolZ crowns presented no visible wear damage. Volume loss (mm
) in the steatite antagonist was as follows (mean ± SD): PolZ = 0.022 ± 0.007, PolGZ = 0.011 ± 0.004, and NoPolGZ = 0.014 ± 0.006. Molar teeth yielded no measurable wear on the antagonist, while the wear scar on the teeth was greater than that on zirconia crowns, ranging from 0.07 to 0.35 mm
. The combination of polishing and glass infiltration on the occlusal surface of monolithic zirconia crowns yielded reduced wear on both crown and antagonist.
Details
- Title: Subtitle
- Wear Behavior of Graded Glass/Zirconia Crowns and Their Antagonists
- Creators
- M R Kaizer - New York UniversityS Bano - New York UniversityM Borba - New York UniversityV Garg - New York UniversityM B F Dos Santos - Universidade Federal de PelotasY Zhang - New York University
- Resource Type
- Journal article
- Publication Details
- Journal of dental research, Vol.98(4), pp.437-442
- DOI
- 10.1177/0022034518820918
- PMID
- 30744472
- PMCID
- PMC6429669
- NLM abbreviation
- J Dent Res
- ISSN
- 0022-0345
- eISSN
- 1544-0591
- Grant note
- R01 DE017925 / NIDCR NIH HHS R01 DE026772 / NIDCR NIH HHS R01 DE026279 / NIDCR NIH HHS
- Language
- English
- Date published
- 04/01/2019
- Academic Unit
- Prosthodontics
- Record Identifier
- 9984946629702771
Metrics
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