title: Eighteen-month clinical performance of composite resin restorations with two different adhesive systems for molars affected by molar incisor hypomineralization.
abstract: BACKGROUND
  The restorative management of molars with molar incisor hypomineralization (MIH) represents a challenge in the clinical practice with high failure rate.
  
  
  OBJECTIVE
  The aim of this study is to evaluate the clinical survival of direct composite resin restorations in first permanent molars (FPMs) that are affected by MIH, comparing two adhesive systems.
  
  
  METHODS
  We selected 41 FPMs with MIH from children aged 6-8 years. FPM fully erupted and with restorative treatment needed were the inclusion criteria. We excluded FPMs with destroyed crowns. The FPMs were randomly assigned to two groups: self-etching adhesive (SEA) and total-etch adhesive (TEA). Clinical evaluation was performed by a blinded examiner during 18 months according to the modified US Public Health Service (USPHS) criteria. The actuarial method was used to evaluate survival of the restorations, and Chi-square and Fisher's exact tests were used to compare differences between the groups (α = 5 %).
  
  
  RESULTS
  The cumulative survival rates were 100 % at 1 month, 89 % at 6 months, 73 % at 12 months, and 68 % at 18 months in SEA, and 95 % at 1 month, 72 % at 6 months, 59 % at 12 months, and 54 % at 18 months in TEA; there was no significant difference between groups.
  
  
  CONCLUSIONS
  There was no difference in clinical survival of restorations in FPMs affected by MIH using TEA or SEA adhesives in the end of 18 months.
  
  
  CONCLUSIONS
  It was suggested that SEAs as well as TEAs can be applied to restore molars affected by MIH, when it is performed a conservative cavity preparation. Once, cavosurface margins (cavity design) in hypomineralized enamel have less bonding capability.
authors.affiliation: Department of Stomatology, School of Dentistry, Federal University of Paraná, UFPR, Paraná, Brazil. julianafeltrin@hotmail.com.
authors.forename: Juliana Feltrin
authors.initials: JF
authors.lastname: de Souza
authors.affiliation: Department of Pediatric Dentistry and Orthodontic, Araraquara School of Dentistry, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Camila Bullio
authors.initials: CB
authors.lastname: Fragelli
authors.affiliation: Department of Pediatric Dentistry and Orthodontic, Araraquara School of Dentistry, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Fabiano
authors.initials: F
authors.lastname: Jeremias
authors.affiliation: Master's Program in Dentistry, CEUMA University, São Luis, Maranhão, Brazil.
authors.forename: Marco Aurélio Benini
authors.initials: MAB
authors.lastname: Paschoal
authors.affiliation: Department of Pediatric Dentistry and Orthodontic, Araraquara School of Dentistry, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Lourdes
authors.initials: L
authors.lastname: Santos-Pinto
authors.affiliation: Department of Pediatric Dentistry and Orthodontic, Araraquara School of Dentistry, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Rita
authors.initials: R
authors.lastname: de Cássia Loiola Cordeiro
mesh_terms: D000134:Acid Etching, Dental; D002648:Child; D003188:Composite Resins / Q000494:pharmacology*; D003738:Dental Cements / Q000494:pharmacology*; D003744:Dental Enamel Hypoplasia / Q000628:therapy*; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D005260:Female; D005899:Glass Ionomer Cements; D006801:Humans; D008297:Male; D008422:Materials Testing; D008963:Molar; D019279:Resin Cements; D016896:Treatment Outcome
chemical_list: C000623315:Adper Scotchbond SE; C438313:Clearfil SE Bond; D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; C515713:Ketac Molar Easymix; D019279:Resin Cements; C533204:filtek Z350
keywords: Adhesive system; Dental restoration; Molar incisor hypomineralization; Randomized clinical trial; Treatment