title: Enamel remineralization on teeth adjacent to Class II glass ionomer restorations.
abstract: OBJECTIVE
  To examine the in vitro remineralization of incipient carious lesions on teeth adjacent interproximally to teeth with Class II glass ionomer cement restorations.
  
  
  METHODS
  Artificial carious lesions were created at the contact area of 30 teeth. Ten teeth had Class II glass ionomer cement/resin composite restorations placed, 10 teeth had Class II glass ionomer silver cermet restorations placed and 10 teeth had Class II amalgam restorations placed. Sections 100 microns thick were obtained longitudinally through the caries sites and polarized photomicrographs were taken in imbibition media of water and Thoulet's (R.I. 1.41 and 1.47) solutions, representing 5%, 10% and 25% pore volume respectively. Varnish was placed on the section, leaving only the external section site exposed, then sections were situated back into the original tooth. The restored teeth were abutted to the carious tooth so that the restorations came into contact with the adjacent restoration. The specimens were placed into closed environments of artificial saliva for 14 days, then were photographed again under polarized light and areas of the carious lesions were quantitated.
  
  
  RESULTS
  An ANOVA indicated significant variance in adjacent tooth remineralization, when comparing the experimental groups, in imbibition media of water (P < 0.05), Thoulet's 1.41 solution (P < 0.008) and Thoulet's 1.47 solution (P < 0.006). Duncan's multiple range test demonstrated the glass ionomer cement/resin composite group to have significantly greater decrease in pore volume (P < 0.05) than the amalgam control group in water imbibition media and Thoulet's 1.47 media. There was no statistically significant difference between the glass ionomer cement/resin composite and glass ionomer silver cermet groups in these two imbibition media. The glass ionomer cement/resin composite group demonstrated significantly more (P < 0.05) decrease in pore volume than both the glass ionomer silver cermet group and amalgam control group in Thoulet's 1.47 imbibition media.
authors.affiliation: Hospital Dentistry, University of Iowa Hospitals and Clinics, Iowa City 52242, USA.
authors.forename: A
authors.initials: A
authors.lastname: Segura
authors.forename: K J
authors.initials: KJ
authors.lastname: Donly
authors.forename: R G
authors.initials: RG
authors.lastname: Stratmann
mesh_terms: D000704:Analysis of Variance; D016722:Cermet Cements / Q000627:therapeutic use; D003188:Composite Resins / Q000627:therapeutic use; D003723:Dental Amalgam / Q000627:therapeutic use; D003731:Dental Caries / Q000209:etiology / Q000628:therapy; D003743:Dental Enamel / Q000187:drug effects* / Q000378:metabolism; D003793:Dental Restoration, Permanent / Q000145:classification / Q000379:methods* / Q000706:statistics & numerical data; D019229:Dentition, Permanent; D005899:Glass Ionomer Cements / Q000627:therapeutic use*; D006801:Humans; D066298:In Vitro Techniques; D008859:Microscopy, Polarization; D008963:Molar; D014089:Tooth Remineralization / Q000379:methods* / Q000706:statistics & numerical data
chemical_list: D016722:Cermet Cements; D003188:Composite Resins; D005899:Glass Ionomer Cements; D003723:Dental Amalgam