title: Microleakage of tooth-colored restorations with a beveled gingival margin.
abstract: OBJECTIVE
  Microleakage of tooth-colored restorative systems was tested in preparations with and without beveled gingival margins.
  
  
  METHODS
  A resin composite, Z-100, and two "compomer" restoratives, Dyract and Geristore, with their accompanying adhesive systems, were placed in nonretentive cervical cavity preparations (at the cementoenamel junction), with and without a beveled gingival margin (dentin or cementum) and beveled occlusal (enamel) margins in extracted bovine teeth. Microleakage was assessed as the ratio of the extent of methylene blue dye penetration at the tooth-restoration interface of the length of the wall.
  
  
  RESULTS
  Z-100 restorations, without a gingival bevel, exhibited significantly less microleakage along the gingival wall and less microleakage overall than did the other materials. Dyract restorations without a gingival bevel and placed without a surface conditioner displayed greater microleakage overall than did the other groups.
  
  
  CONCLUSIONS
  With all materials, Class V restorations with gingival bevels displayed greater microleakage than did nonbeveled margins.
authors.affiliation: Department of General Dentistry, University of Tennessee, College of Dentistry, Memphis 38163, USA. BOwens@dental.utmem.edu
authors.forename: B M
authors.initials: BM
authors.lastname: Owens
authors.forename: T K
authors.initials: TK
authors.lastname: Halter
authors.forename: D M
authors.initials: DM
authors.lastname: Brown
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate; D002417:Cattle; D020770:Compomers; D003188:Composite Resins; D003737:Dental Cavity Preparation / Q000009:adverse effects; D003763:Dental Leakage / Q000209:etiology; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D008689:Methacrylates; D011109:Polymethacrylic Acids; D019279:Resin Cements; D012117:Resins, Synthetic; D017640:Silicates; D012822:Silicon Dioxide; D019237:Tooth Cervix; D015040:Zirconium
chemical_list: D020770:Compomers; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C088486:Dyract; C074933:Geristore; D005899:Glass Ionomer Cements; D008689:Methacrylates; D011109:Polymethacrylic Acids; C103500:Prime & Bond; D019279:Resin Cements; D012117:Resins, Synthetic; C084018:Scotchbond Multi-Purpose; D017640:Silicates; C083568:Z100 composite resin; C074811:Tenure adhesive; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D015040:Zirconium