title: Microleakage of Class II box-type composite restorations.
abstract: OBJECTIVE
  To investigate whether in small box-type Class II preparations the use of glass ionomer cement, a dentin primer or a different type of conditioner had an effect on the microleakage compared to a more simple total-etch system using a phosphonated bonding agent.
  
  
  METHODS
  In extracted premolars, 84 box-type Class II composite resin restorations with margins in enamel were made following a standardized protocol. A transparent matrix system was used and the composite resin was applied in two layers. The teeth were restored using a phosphonated total-etch bonding system as a control (Photo Bond). In the experimental groups a glass ionomer lining-cement (Vitrebond), a total-etch adhesive including a primer (Scotchbond Multi-Purpose) and a total-etch adhesive using a self-etching primer (Liner Bond 2) were used. The teeth were thermocycled, immersed in a dye solution and sectioned. The cervical and occlusal dye penetration was assessed.
  
  
  RESULTS
  Preventing microleakage was not more effective in the experimental groups than in the control group (P < 0.05). Scotchbond MP groups using maleic acid showed statistically significant more microleakage than the control group (Photo Bond) at the cervical side. Liner Bond 2 and Scotchbond MP groups using maleic acid showed statistically significant more microleakage than the control group at the occlusal side. The use of a lining cement did not improve the quality of the restoration. From this study it was concluded that in this type of restoration, total-etch systems using a primer are not always an improvement.
authors.affiliation: Department of Cariology and Endodontology, University of Nijmegen, The Netherlands.
authors.forename: N J
authors.initials: NJ
authors.lastname: Opdam
authors.forename: J J
authors.initials: JJ
authors.lastname: Roeters
authors.forename: R C
authors.initials: RC
authors.lastname: Burgersdijk
mesh_terms: D000134:Acid Etching, Dental; D001641:Bicuspid; D003188:Composite Resins; D001840:Dental Bonding; D003736:Dental Cavity Lining; D003737:Dental Cavity Preparation / Q000379:methods; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D006801:Humans; D008689:Methacrylates; D019279:Resin Cements; D018709:Statistics, Nonparametric
chemical_list: C112274:Clearfil Liner Bond 2; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D008689:Methacrylates; C088835:Photac-Bond; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C092420:Clearfil Photo Posterior; C067790:Vitrabond