title: Dental materials for primary dentition: are they suitable for occlusal restorations? A two-body wear study.
abstract: OBJECTIVE
  This was to evaluate the wear resistance of different materials, compomers, resin-modified glass ionomer cements (RMGICs), glass ionomer cements (GICs), used for posterior restorations in primary teeth and to compare the results with the reference material, amalgam.
  
  
  METHODS
  Eight specimens of each material were subjected to two-body wear test, using a chewing simulator. The wear region of each material was examined under a profilometer, measuring the vertical loss (μm) and the volume loss (mm(3)) of the materials.
  
  
  RESULTS
  The results showed significant differences of vertical loss and volume loss of the test materials (p < 0.001). Amalgam had the highest wear resistance. Twinky Star (compomer) had the lowest vertical loss and volume loss. There was no significant difference of vertical loss among compomers, Dyract Extra, Dyract Flow and Dyract Posterior. Riva Self Cure (GIC) had no statistically significant difference compared with the compomers (except Twinky Star). No statistically significant difference was found also between Equia (GIC) and Ketac Moral (GIC) with Dyract Extra (Compomer). RMGICs were found to have the lowest wear resistance.
  
  
  METHODS
  For the statistical analysis, the PASW 20.0 (SPSS Statistics, IBM, Chicago) package was used. Means and standard deviations were measured with descriptive statistics and analyzed using one-way ANOVA.
  
  
  CONCLUSIONS
  Compomers and some GICs, that have moderate wear resistance, may be sufficient for occlusal restorations in primary dentitions.
authors.affiliation: Dental Clinic 1-Operative Dentistry and Periodontology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany, lazaridoudimi@yahoo.gr.
authors.forename: D
authors.initials: D
authors.lastname: Lazaridou
authors.forename: R
authors.initials: R
authors.lastname: Belli
authors.forename: N
authors.initials: N
authors.lastname: Krämer
authors.forename: A
authors.initials: A
authors.lastname: Petschelt
authors.forename: U
authors.initials: U
authors.lastname: Lohbauer
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D019554:Dental Restoration Wear / Q000145:classification*; D003793:Dental Restoration, Permanent / Q000145:classification*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D013499:Surface Properties; D014094:Tooth, Deciduous / Q000473:pathology*
chemical_list: D000538:Aluminum Silicates; D020770:Compomers; D003188:Composite Resins; D003722:Dental Alloys; D003764:Dental Materials; C088486:Dyract; C079765:Fuji II LC cement; C439808:Fuji IX GP Fast; D005899:Glass Ionomer Cements; C454800:Ketac-Molar Quick; D019279:Resin Cements; D012117:Resins, Synthetic; C476993:dyract flow; C033470:Dispersalloy; D003723:Dental Amalgam; C039733:Chemfil