title: [Comparison of piezosurgery and chisel osteotomy in the extraction of mandibular impacted third molars].
abstract: OBJECTIVE
  To study the effect of piezosurgery in the extraction of mandibular impacted third molars.
  
  
  METHODS
  228 mandibular impacted third molars with relative difficulty for extraction according to the scheme of degree of difficulty for extraction were included in the study, and were divided into two groups (114 teeth each group): Test group (treated by piezosurgery), control group (treated by traditional chisel osteotomy). The surgery time and pain, restriction of mouth opening and facial swelling after surgery, were evaluated in both groups.
  
  
  RESULTS
  The average surgery time was (16 +/- 5.2) min in test group and (30 +/- 8.7) min in control group. The surgery time, pain, facial swelling rate, and restriction of mouth opening were lower than control group (P<0.05).
  
  
  CONCLUSIONS
  Compared with traditional chisel osteotomy, the average surgery time with piezosurgery was significantly shorter and the complications are obviously reduced.
authors.affiliation: Dept. of Stomatology, The Ninth People's Hospital of Shenzhen City, Shenzhen 518116, China.
authors.forename: Yongbo
authors.initials: Y
authors.lastname: Gao
authors.forename: Ai
authors.initials: A
authors.lastname: Jiang
authors.forename: Boyou
authors.initials: B
authors.lastname: Li
authors.forename: Liming
authors.initials: L
authors.lastname: Yang
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible; D008964:Molar, Third; D010027:Osteotomy; D059745:Piezosurgery; D014081:Tooth Extraction; D014095:Tooth, Impacted