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Types of Surface Damage and Wear
Published in J. Blau Peter, Tribosystem Analysis: A Practical Approach to the Diagnosis of Wear Problems, 2017
The study of tribocorrosion has seen a growing interest in recent years with the publication of several books [60,61] and the introduction of a new journal (Journal of Bio- and Tribo-Corrosion, Springer Publications). Dental research has used the term tribochemical wear as a synonym for “dental erosion,” emphasizing the interplay of erosion, 3-body abrasion, and attrition in tooth wear. A review of methods to apply such combinations was published by Lambrechts et al. [62]. These authors point out that the apparati used to simulate the tooth/tooth, tooth/ restorative, and restorative/restorative tribosystems have taken a variety of forms, some of which simulate multiple forms of wear, and some, more simple geometries and motions.
Deterioration of direct restorative materials under erosive conditions with impact of abrasion and attrition in vitro
Published in Biomaterial Investigations in Dentistry, 2023
Aida Mulic, Amund Ruud, Ida R. Stenhagen, Ellen Bruzell, Amela Tulek
Tooth wear is an irreversible, physiological phenomenon that may be classified into several categories: abrasion (tooth wear in the presence of a foreign medium), erosion (acid-induced tooth wear) and attrition (wear as a consequence of tooth-to-tooth contact) [1]. Excessive consumption of acidic foods or regurgitation of the gastric acid in the oral cavity may chemically induce tooth substance loss [2,3]. Moreover, when acid softens the tooth surface, it becomes susceptible to physical impacts, namely abrasion and attrition [4]. The process of wear is more severe in some patients, for example those suffering from parafunctional habits [5]. Excessive wear often causes exposure of dentine canals and tooth pulp. Clinically, this manifests as hypersensitivity and pain, reduced chewing efficiency and discolorations [6,7].
Reduction of tooth wear on asymmetric spur gear through profile correction factors
Published in Australian Journal of Mechanical Engineering, 2022
Tooth wear is a process of continuous removal of eroded material from the gear tooth owing to relative sliding motion variations between thae pinion and gear. Analysis of the wear process is used for gaining an understanding of how wear develops and its maximum occurrence on the tooth profiles. Boosting the wear resistance of spur gear tooth is a most essential research area as the focus is on reducing noise and vibration and contact fatigue failures and improving the service life of the gear tooth. Many authors have developed numerical as well as experimental models to evaluate the wear resistance capacity of symmetric gear tooth for different materials (metal gear, polymer gear and nanocomposite gear) under different working conditions, such as speed and torque, lubricated and unlubricated, and static and dynamic conditions. Tooth wear mainly depends upon the tooth load, tooth surface geometry, tooth contact pressure, surface conditions and the lubricants (Verbeek 1979). Flodin and Andersson (1997) developed a numerical procedure to evaluate tooth wear in symmetric gears. In this research work, Archard’s (1953) wear models were suitably modified for the gear contact problem to estimate the wear depth along the contact line. From this study, it was observed that the highest tooth wear occurred on the flank of the spur gears. Onishchenko’s (2008) wear prediction model included the kinematic model of tooth engagement. He concluded that wear of the tooth profile was non-uniform along the height of the tooth and the intensity of the wear process was not constant. An experimental study was conducted by Brandao et al. (2016) onthe mean wear coefficient, and the effect of the film thickness as well as contact load on tooth wear was noted. In this investigative study, Archard’s tooth wear equation was used to evaluate the wear coefficient. Non-linear wear behaviour was identified at a very low film thickness, and increased wear was noticed with the increase in contact load.