title: Three cements used for orthodontic banding of porcelain molars.
abstract: OBJECTIVE
  Objectives of this study were to (1) compare the mean shear-peel bond strength of orthodontic bands luted to porcelain molar denture teeth with glass ionomer cement (GIC), resin-modified glass ionomer cement (RMGIC), or compomer cement; (2) assess the amount of cement remaining on the teeth after debanding; and (3) compare the survival times of the cemented bands subject to mechanical fatigue.
  
  
  METHODS
  Sixty banded denture teeth (20 per cement group) were used to determine shear-peel bond strength, and 30 banded denture teeth (10 per cement group) were used to determine fatigue survival time. Shear-peel bond strength was determined with a universal testing machine, and groups were compared by one-way analysis of variance. The amount of cement remaining on the teeth after band removal was scored, and a chi-square test was used to compare groups. Fatigue testing was conducted in a ball mill, and a log-rank test was used to compare differences in survival times.
  
  
  RESULTS
  No differences were found in mean shear-peel bond strength among the three groups. The amount of cement remaining on the teeth varied between the compomer and GIC groups (P = .01), with more compomer cement remaining relative to GIC. The mean survival times of bands cemented with compomer or RMGIC were longer than for bands cemented with GIC (P < .001).
  
  
  CONCLUSIONS
  The findings show that on porcelain teeth the band cements have comparable mean shear-peel bond strengths, but that band retention with RMGIC and compomer cement are superior to GIC when subjected to simulated mechanical fatigue.
authors.affiliation: Willamette Dental Group, Beaverton, Oregon, USA.
authors.forename: Tracy
authors.initials: T
authors.lastname: Herion
authors.forename: Jack L
authors.initials: JL
authors.lastname: Ferracane
authors.forename: David A
authors.initials: DA
authors.lastname: Covell
mesh_terms: D000704:Analysis of Variance; D016009:Chi-Square Distribution; D020770:Compomers; D001840:Dental Bonding; D017005:Dental Debonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements / Q000737:chemistry; D008422:Materials Testing; D009967:Orthodontic Appliances; D019279:Resin Cements; D033081:Shear Strength; D016019:Survival Analysis; D014093:Tooth, Artificial
chemical_list: D020770:Compomers; D005899:Glass Ionomer Cements; D019279:Resin Cements; D003776:Dental Porcelain