On the construction of wear maps for Y-TZP dental ceramics in aqueous environments: pH, exposure time and impact angle effects

Abstract

This version is available at https://strathprints.strath.ac.uk/18785/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractThe purpose of this study was to test ιν−ϖιτρο the micro and nano tribological properties of Y−TZP (Yttria Tetragonal Zirconia Polycrystalline) material used in the construction of artificial teeth or dental crowns. The results showed that the effect of pH was to accelerate the wear rate of the Y−TZP material. However, this phenomenon was more apparent in acid than in alkaline environments. Wear maps were constructed based on the results identifying wastage regimes for the material in the erosion−corrosion conditions at a range of impact angles. In addition, a wear map was generated based on the transition from tetragonal to monoclininc phase for the material and the transition to high wear at various pHs and exposure times.

Tribo-corrosion of steel in artificial saliva

“…Based on previous work [42],the categories were defined as follows based the maximum wear volume produced (0.2505 mm 3 ):…”

Micro-abrasion of Y-TZP in tea

“…However, in some cases there is a change in gradient, suggesting that wear volume does not increase linearly as is stated in some papers [47] contradicting the predictions of the Archard equation with a direct increase in wear rate with load. It should be noted that within the oral cavity, a range of pH between 1.2 and 10 can be experienced [2]. The results in Fig.…”

“…Inefficiency of masticatory system and poor contact between opposite teeth and chewing surfaces are the very common results of wear of teeth texture [1]. The tribological processes inside the oral cavity are categorised as: attrition (the act of wearing away of the surfaces), corrosion (mass loss due to the chemical reactions), erosion (impact of the particles in the slurries), abrasion (the process of wearing down by the friction) and abfraction (eventual fatigue and loss or cracking of the tissue) [2]. These processes do not happen individually.…”

A comparison of the tribological behaviour of Y-TZP in tea and coffee under micro-abrasion conditions

“…Furthermore, the influences of the increased load are more significant under 2-body mechanisms [36]. However, the increasing common consumption of fizzy soft drinks creates an environment in the oral cavity that exceeds the acidity (with a pH of 3.0 or lower) and viscosity of the tested drink solutions [37], which has been addressed in previous work by the current authors [38,39]. The results of these experiments suggest that there are additional factors, which are not included in the Archard Equation, that must be considered in evaluating the performance of Y-TZP dental implants.…”