title: Cervical microleakage in composite restorations of primary teeth--in vitro study.
abstract: OBJECTIVE
  The purpose of this study is to evaluate in vitro the cervical microleakage of two bonding systems (Group 1: Scotchbond Multi-Purpose-3M; Group 2: Clearfil Mega Bond-Kuraray) in occluso-proximal composite restorations of primary molars.
  
  
  METHODS
  Two occluso-proximal standard cavities preparations (vertical slots) were made in each one of the 11 primary molars. The cavities were filled using adhesive systems (one for each cavity) and hybrid composite (Filtek Z250-3M) by incremental technique. The first increment was inserted horizontally at the cervical wall and light-cured with 100 mW/cm2 intensity for 60 s (VIP-Bisco). Other two increments were inserted diagonally on the buccal and lingual portion and each one light-cured with 200 mW/cm2 intensity for 60s. The restorations were finished and polished, and then partially sealed and embedded in 0.5% methylene blue solution for 24 h. The specimens were sectioned mesio-distally and the dye penetration was evaluated (score from 0 to 3) under a stereomicroscope.
  
  
  RESULTS
  The statistical analysis (Qui square and Mann-Whitney non-parametric test) revealed no statistical difference (p=0.193) between the two adhesive systems tested.
  
  
  CONCLUSIONS
  Both bonding systems provided small early cervical microleakage in occluso-proximal restorations of primary molars.
authors.affiliation: Department of Pediatric Dentistry, School of Dentistry, Universidade Federal do Rio Grande do Sul, Ramiro Barcelos 2492, Bom Fim, Porto Alegre, RS 90.035-003, Brazil. lucianocasagrande@hotmail.com
authors.forename: Luciano
authors.initials: L
authors.lastname: Casagrande
authors.forename: Rosângela
authors.initials: R
authors.lastname: Brayner
authors.forename: Juliana Sarmento
authors.initials: JS
authors.lastname: Barata
authors.forename: Fernando Borba
authors.initials: FB
authors.lastname: de Araujo
mesh_terms: D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003763:Dental Leakage / Q000145:classification*; D003775:Dental Polishing; D003793:Dental Restoration, Permanent; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008751:Methylene Blue; D008963:Molar / Q000473:pathology; D019279:Resin Cements / Q000737:chemistry; D019237:Tooth Cervix / Q000473:pathology*; D014094:Tooth, Deciduous / Q000473:pathology*
chemical_list: D004396:Coloring Agents; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; C095452:Megabond; D008689:Methacrylates; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D008751:Methylene Blue