title: Marginal adaptation and performance of bioactive dental restorative materials in deciduous and young permanent teeth.
abstract: OBJECTIVE
  The aim of this study was to investigate the adaptation of different types of restorations towards deciduous and young permanent teeth.
  
  
  METHODS
  Class V cavities were prepared in deciduous and young permanent teeth and filled with different materials (a conventional glass-ionomer, a resin-modified glass-ionomer, a poly-acid-modified composite resin and a conventional composite resin). Specimens were aged in artificial saliva for 1, 6, 12 and 18 months, then examined by SEM.
  
  
  RESULTS
  The composite resin and the polyacid-modified composite had better marginal adaptation than the glass-ionomers, though microcracks developed in the enamel of the tooth. The glass-ionomers showed inferior marginal quality and durability, but no microcracking of the enamel. The margins of the resin-modified glass-ionomer were slightly superior to the conventional glass-ionomer. Conditioning improved the adaptation of the composite resin, but the type of tooth made little or no difference to the performance of the restorative material. All materials were associated with the formation of crystals in the gaps between the filling and the tooth; the quantity and shape of these crystals varied with the material.
  
  
  CONCLUSIONS
  Resin-based materials are generally better at forming sound, durable margins in deciduous and young permanent teeth than cements, but are associated with microcracks in the enamel. All fluoride-releasing materials give rise to crystalline deposits.
authors.affiliation: Clinic for Pediatric and Preventive Dentistry, Faculty of Dental Medicine, University Sts. Kiril and Metodij Skopje, Republic of Macedonia.
authors.forename: Elizabeta
authors.initials: E
authors.lastname: Gjorgievska
authors.forename: John W
authors.initials: JW
authors.lastname: Nicholson
authors.forename: Snezana
authors.initials: S
authors.lastname: Iljovska
authors.forename: Ian J
authors.initials: IJ
authors.lastname: Slipper
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002327:Cariostatic Agents / Q000737:chemistry; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003460:Crystallization; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000648:ultrastructure; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000379:methods*; D005459:Fluorides / Q000737:chemistry; D005500:Follow-Up Studies; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors; D014094:Tooth, Deciduous / Q000473:pathology*
chemical_list: D001672:Biocompatible Materials; D002327:Cariostatic Agents; D020770:Compomers; D003188:Composite Resins; D003764:Dental Materials; C088486:Dyract; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D019279:Resin Cements; D012117:Resins, Synthetic; D012464:Saliva, Artificial; C510179:UniFil Flow; C110713:fuji IX; D005459:Fluorides