title: Rotary Instrument or Piezoelectric for the Removal of Third Molars: a Meta-Analysis.
abstract: OBJECTIVE
  The aim of this systematic review and meta-analysis was to compare, in the lower third molar surgery, the osteotomy techniques with rotary instruments and piezoelectric motors.
  
  
  METHODS
  An electronic search was conducted using the following databases: Pubmed, Web of Science, and the Cochrane Oral Health Group Trials Register. Inclusion criteria were: studies in humans, randomized or nonrandomized, comparing the extraction of third molars that required osteotomy and/or odontosection with rotary instrument and osteotomy and/or odontosection with piezoelectric motor assistance. The analysis and inclusion of articles was performed by two reviewers independently. An evaluation of the quality of articles and data extraction was carried out.
  
  
  RESULTS
  From a total of nine hundred seventy four (974) trials, eleven articles were included in the qualitative analysis, and seven were included in the quantitative analysis. Rotary instruments were faster than the piezoelectric surgery (95 % CI 0.34 to 1.16). The piezoelectric surgery showed better results when compared with roatry instruments when trismus was assessed in 2 (95 % CI 0.65 to 1.69), 3 (95 % CI 0.63 to 1.67) and 5 (95 % CI 0.03 to 2.26) days after surgery. Seven days after surgery, there were no differences between the techniques (95 % CI (-0.022) to (-1.49)).
  
  
  CONCLUSIONS
  The piezoelectric surgery was effective in reducing pain, swelling and trismus in third molar surgery, but the same requires greater surgical time than the rotary instruments.
authors.affiliation: Departamento de Odontologia, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais Brazil.
authors.forename: Rafael Alvim
authors.initials: RA
authors.lastname: Magesty
authors.affiliation: Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Brazil.
authors.forename: Endi Lanza
authors.initials: EL
authors.lastname: Galvão
authors.affiliation: Pediatric Dentistry, Faculdade de Odontologia, Universidade Federal de Minas Gerias, Belo Horizonte, Brazil.
authors.forename: Carolina
authors.initials: C
authors.lastname: de Castro Martins
authors.affiliation: Oral and Maxillofacial Surgery, Departamento de Odontologia, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais Brazil.
authors.forename: Cássio Roberto Rocha
authors.initials: CRR
authors.lastname: Dos Santos
authors.affiliation: Oral and Maxillofacial Surgery, Departamento de Odontologia, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais Brazil.
authors.forename: Saulo Gabriel Moreira
authors.initials: SGM
authors.lastname: Falci
keywords: Oral surgery; Piezoeletric surgery; Third molar