title: Class I occlusal composite resin restorations: in vivo post-operative sensitivity, wall adaptation, and microleakage.
abstract: OBJECTIVE
  To investigate the effect of restoration technique and adhesive system on the post-operative sensitivity and marginal adaptation of Class I occlusal composite resin restorations placed in vivo.
  
  
  METHODS
  48 Class I cavities were restored in vivo according to one of three protocols: (1) Scotchbond Multi-Purpose/P50 placed in increments; (2) Scotchbond Multi-Purpose/P50 placed in bulk, and (3) Clearfil Liner Bond 2/Clearfil Ray Posterior placed in bulk. Post-operative sensitivity and sensitivity on loading were recorded 5-7 weeks after placement of the restorations; the teeth were cautiously extracted, immersed in a dye solution and sectioned. SEM observations were made from epoxy resin replicas. Microleakage and gap formation was assessed.
  
  
  RESULTS
  No differences among adhesive systems or restoration procedures were found for microleakage. Post-operative sensitivity was reported in 14% of all teeth but was absent in the Clearfil Liner Bond 2 group. Sensitivity on loading was experienced by patients in 56% of the restorations. Group 1: nine teeth; Group 2: 15 teeth; Group 3: three teeth. Differences were statistically significant for all three groups. The SEM analysis showed that restorations placed in two layers showed less gaps than restorations placed in bulk.
authors.affiliation: Department of Cariology and Endodontology, University of Nijmegen, The Netherlands.
authors.forename: N J
authors.initials: NJ
authors.lastname: Opdam
authors.forename: A J
authors.initials: AJ
authors.lastname: Feilzer
authors.forename: J J
authors.initials: JJ
authors.lastname: Roeters
authors.forename: I
authors.initials: I
authors.lastname: Smale
mesh_terms: D000134:Acid Etching, Dental; D000293:Adolescent; D000704:Analysis of Variance; D001641:Bicuspid; D002648:Child; D003188:Composite Resins / Q000009:adverse effects; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods; D003807:Dentin Sensitivity / Q000209:etiology; D017220:Dentin-Bonding Agents / Q000009:adverse effects; D005260:Female; D006801:Humans; D008297:Male; D008422:Materials Testing; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D016017:Odds Ratio; D019279:Resin Cements; D018709:Statistics, Nonparametric; D019246:Tooth Preparation
chemical_list: C084544:Clearfil Linerbond System; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose