title: Wear of primary teeth caused by opposed all-ceramic or stainless steel crowns.
abstract: OBJECTIVE
  This study was conducted to evaluate the effects of full-coverage all-ceramic zirconia, lithium disilicate glass-ceramic, leucite glass-ceramic, or stainless steel crowns on antagonistic primary tooth wear.
  
  
  METHODS
  There were four study groups: the stainless steel (Steel) group, the leucite glass-ceramic (Leucite) group, the lithium disilicate glass-ceramic (Lithium) group, and the monolithic zirconia (Zirconia) group. Ten flat crown specimens were prepared per group; opposing teeth were prepared using primary canines. A wear test was conducted over 100,000 chewing cycles using a dual-axis chewing simulator and a 50 N masticating force, and wear losses of antagonistic teeth and restorative materials were calculated using a three-dimensional profiling system and an electronic scale, respectively. Statistical significance was determined using One-way ANOVA and Tukey's test (P<.05).
  
  
  RESULTS
  The Leucite group (2.670±1.471 mm(3)) showed the greatest amount of antagonist tooth wear, followed by in decreasing order by the Lithium (2.042±0.696 mm(3)), Zirconia (1.426±0.477 mm(3)), and Steel groups (0.397±0.192 mm(3)). Mean volume losses in the Leucite and Lithium groups were significantly greater than in the Steel group (P<.05). No significant difference was observed between mean volume losses in the Zirconia and Steel groups (P>.05).
  
  
  CONCLUSIONS
  Leucite glass-ceramic and lithium disilicate glass-ceramic cause more primary tooth wear than stainless steel or zirconia.
authors.affiliation: Department of Prosthodontics, Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
authors.forename: Jae-Won
authors.identifier: 0000-0001-6786-9251
authors.initials: JW
authors.lastname: Choi
authors.affiliation: Woorimi Dental Clinic, Busan, Republic of Korea.; Department of Pediatric Dentistry, Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
authors.forename: Ik-Hyun
authors.initials: IH
authors.lastname: Bae
authors.affiliation: Department of Pediatric Dentistry, Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
authors.forename: Tae-Hwan
authors.initials: TH
authors.lastname: Noh
authors.affiliation: Dental Research Institute and Department of Biomaterials Science, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
authors.forename: Sung-Won
authors.initials: SW
authors.lastname: Ju
authors.affiliation: EZ Plant, Seoul, Republic of Korea.
authors.forename: Tae-Kyoung
authors.initials: TK
authors.lastname: Lee
authors.affiliation: Dental Research Institute and Department of Biomaterials Science, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
authors.forename: Jin-Soo
authors.initials: JS
authors.lastname: Ahn
authors.affiliation: Department of Pediatric Dentistry, Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
authors.forename: Tae-Sung
authors.initials: TS
authors.lastname: Jeong
authors.affiliation: Department of Prosthodontics, Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
authors.forename: Jung-Bo
authors.identifier: 0000-0001-7578-1989
authors.initials: JB
authors.lastname: Huh
keywords: Leucite porcelain; Lithium disilicate porcelain; Primary tooth; Wear; Zirconia