title: Investigation on the Tribological Behavior and Wear Mechanism of Five Different Veneering Porcelains.
abstract: OBJECTIVE
  The primary aim of this research was to investigate the wear behavior and wear mechanism of five different veneering porcelains.
  
  
  METHODS
  Five kinds of veneering porcelains were selected in this research. The surface microhardness of all the samples was measured with a microhardness tester. Wear tests were performed on a ball-on-flat PLINT fretting wear machine, with lubrication of artificial saliva at 37°C. The friction coefficients were recorded by the testing system. The microstructure features, wear volume, and damage morphologies were recorded and analyzed with a confocal laser scanning microscope and a scanning electron microscope. The wear mechanism was then elucidated.
  
  
  RESULTS
  The friction coefficients of the five veneering porcelains differ significantly. No significant correlation between hardness and wear volume was found for these veneering porcelains. Under lubrication of artificial saliva, the porcelain with higher leucite crystal content exhibited greater wear resistance. Additionally, leucite crystal size and distribution in glass matrix influenced wear behavior. The wear mechanisms for these porcelains were similar: abrasive wear dominates the early stage, whereas delamination was the main damage mode at the later stage. Furthermore, delamination was more prominent for porcelains with larger crystal sizes.
  
  
  CONCLUSIONS
  Wear compatibility between porcelain and natural teeth is important for dental restorative materials. Investigation on crystal content, size, and distribution in glass matrix can provide insight for the selection of dental porcelains in clinical settings.
authors.affiliation: State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Min
authors.affiliation: State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Stomatology, The Second People's Hospital of Nanning City, Guangxi, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Qiu
authors.affiliation: State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, China.
authors.forename: Minhao
authors.initials: M
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
authors.forename: Haiyang
authors.initials: H
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Gao
mesh_terms: D003776:Dental Porcelain / Q000737:chemistry*; D003801:Dental Veneers; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D013499:Surface Properties; D057085:Tooth Wear
chemical_list: D003776:Dental Porcelain