title: Clinical evaluation of composite restorations in Er:YAG laser-prepared cavities re-wetting with chlorhexidine.
abstract: OBJECTIVE
  The objective of this study was to evaluate longitudinally the composite restorations, performed in cavities prepared by Er:YAG or conventional bur, and dentin re-wetting with water or chlorhexidine.
  
  
  METHODS
  Twenty individuals with four active caries with cavitation reaching the dentin located on the occlusal surface of molars counterparts are selected. The teeth of each individual were randomly assigned into four groups: (I) Er:YAG laser (260 mJ/4 Hz) re-wetting with chlorhexidine, (II) Er:YAG laser (260 mJ/4 Hz) re-wetting with deionized water, (III) conventional method re-wetting with chlorhexidine, and (IV) conventional method re-wetting with deionized water. The teeth were isolated, prepared cavities, phosphoric acid etching, and re-wetting according to previously assigned method. Restoration was performed employing the Single Bond 2 and Z350XT resin. Clinical follow-up was held after the polishing of the restoration (baseline) and 6 and 12 months of the making of the restoration using the modified USPHS criteria. The restorations were qualitatively analyzed by means of photographs. In the evaluation period, replicas of the restorations were analyzed by SEM. Data were analyzed by statistics using chi-square test (p < 0.05).
  
  
  RESULTS
  After 12 months of clinical evaluation, groups prepared with laser and re-wetting with chlorhexidine and water showed the lowest marginal staining value. There was no statistical difference between the groups for other factors. SEM analysis revealed that a non-expressive amount of restorations showed gaps and irregularities of tooth-restoration interface after 6 and 12 months compared to the baseline.
  
  
  CONCLUSIONS
  The restorations performed in laser-prepared cavities, regardless of the re-wetting, presented the best clinical performance over the evaluated period.
  
  
  CONCLUSIONS
  Laser-prepared teeth, regardless of re-wetting, showed greater resistance to marginal discoloration.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Meridional College-IMED, Senador Pinheiro, 304, Cruzeiro, Passo Fundo, Rio Grande do Sul, RS, 99070-220, Brazil.
authors.forename: Daniel
authors.initials: D
authors.lastname: Galafassi
authors.affiliation: Department of Pediatric Dentistry, School of Dentistry, Serra Gaucha College-FSG, Os Dezoito do Forte 2366, São Pelegrino, Caxias do Sul, Rio Grande do Sul, RS, 95020-472, Brazil.
authors.forename: Camila
authors.initials: C
authors.lastname: Scatena
authors.affiliation: Dentistry Department, Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, MG, Brazil.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Galo
authors.affiliation: Restorative Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, Monte Alegre, Ribeirão Preto, SP, 14040-904, Brazil.
authors.forename: Fabiana Almeida
authors.initials: FA
authors.lastname: Curylofo-Zotti
authors.affiliation: Restorative Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, Monte Alegre, Ribeirão Preto, SP, 14040-904, Brazil.
authors.forename: Silmara Aparecida Milori
authors.initials: SAM
authors.lastname: Corona
authors.affiliation: Clinical Pediatric Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, s/n, Monte Alegre, Ribeirão Preto, SP, 14040-904, Brazil. borsatto@forp.usp.br.
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Borsatto
mesh_terms: D000134:Acid Etching, Dental; D002648:Child; D002710:Chlorhexidine / Q000627:therapeutic use; D003188:Composite Resins / Q000737:chemistry*; D003731:Dental Caries / Q000628:therapy*; D003737:Dental Cavity Preparation / Q000379:methods*; D003738:Dental Cements; D005260:Female; D006801:Humans; D053844:Lasers, Solid-State / Q000627:therapeutic use*; D055115:Light-Curing of Dental Adhesives; D008297:Male; D008855:Microscopy, Electron, Scanning; D016896:Treatment Outcome; D014867:Water; D017155:Wettability
chemical_list: C554641:Adper single bond 2; D003188:Composite Resins; D003738:Dental Cements; C533204:filtek Z350; D014867:Water; D002710:Chlorhexidine
keywords: Adhesives systems; Er:YAG laser; Marginal integrity; Re-wetting