title: Effect of enamel bevel on retention of cervical composite resin restorations: A systematic review and meta-analysis.
abstract: OBJECTIVE
  To identify if enamel bevelling, compared to no treatment, improves the retention rates and marginal discolouration of cervical composite restorations in non-carious cervical lesions (NCCLs) of adult patients, through a systematic review of the literature and meta-analysis.
  
  
  METHODS
  MEDLINE, Scopus, Web of Science, LILACS, BBO Library, Cochrane Library and SIGLE were searched without restrictions, as well as the abstracts of the annual conference of the IADR and the trials registry. Dissertations and theses were searched using the ProQuest Dissertations and Periódicos Capes Theses databases.
  
  
  METHODS
  We included randomised clinical trials (RCTs) that compared the retention rates restorations in NCCLs placed with or without bevel with at least 1-year follow-up. The risk of bias tool of the Cochrane Collaboration was used for quality assessment.
  
  
  METHODS
  After duplicate removal, 1356 articles were identified. After abstract screening, 14 studies remained and this number was reduced to four after examination of the full-texts. Only two were considered to have a 'low' risk of bias. The overall risk difference was 0.0 (95% CI -0.04 to 0.04) for the retention rate (p=0.91) and 0.05 (-0.02 to 0.13) for the marginal discolouration (p=0.17).
  
  
  CONCLUSIONS
  No superiority of bevelled restorations was observed in the short-term follow-up of 1-year, although this conclusion was based on only two RCTs. There is not enough evidence to support the bevelled technique over non-bevelled for NCCLs over longer periods of time. Better standardization and reporting of RCTs of enamel bevelling are necessary in longer-term follow-ups.
  
  
  CONCLUSIONS
  The literature still lacks a body of evidence to support the benefits of enamel bevel over non-bevelled for longer-term follow-ups, and future randomised clinical trials with low risk of bias should be conducted.
authors.affiliation: Department of Dental Materials, Federal University of Rio de Janeiro, Av. Carlos Chagas Filho, 373, Prédio do CCS, Bloco K, Ilha da Cidade Universitária, Rio de Janeiro, RJ, Brazil.
authors.forename: Marcos
authors.initials: M
authors.lastname: Schroeder
authors.affiliation: Department of Restorative Dentistry, State University of Ponta Grossa, Av. General Carlos Cavalcanti, 4748, CEP 84030-900 Ponta Grossa, PR, Brazil.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Reis
authors.affiliation: Faculty of Dentistry, University of Valparaíso, Rua Subida Carvallo, 211, Playa Ancha, Valparaíso, CEP 2360004, Chile.
authors.forename: Issis
authors.initials: I
authors.lastname: Luque-Martinez
authors.affiliation: Department of Restorative Dentistry, State University of Ponta Grossa, Av. General Carlos Cavalcanti, 4748, CEP 84030-900 Ponta Grossa, PR, Brazil.
authors.forename: Alessandro Dourado
authors.initials: AD
authors.lastname: Loguercio
authors.affiliation: Federal University of Rio de Janeiro, Av. Carlos Chagas Filho, 373, Centro de Ciências da Saúde, Bloco L, Ilha do Fundão, CEP 21941-902 Rio de Janeiro, RJ, Brazil.
authors.forename: Danielle
authors.initials: D
authors.lastname: Masterson
authors.affiliation: Department of Pediatric Dentistry and Orthodontic, Federal University of Rio de Janeiro, Postal code: 68066, Cidade Universitária, CCS, CEP 21941-971 Rio de Janeiro, RJ, Brazil. Electronic address: rorefa@terra.com.br.
authors.forename: Lucianne Cople
authors.initials: LC
authors.lastname: Maia
mesh_terms: D003188:Composite Resins / Q000008:administration & dosage* / Q000737:chemistry; D003743:Dental Enamel; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent; D017220:Dentin-Bonding Agents; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D019237:Tooth Cervix / Q000378:metabolism*; D014075:Tooth Discoloration; D016896:Treatment Outcome
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents
keywords: Cervical lesions; Composite restorations; Enamel bevelling; Randomised clinical trials; Systematic review