title: [Comparative study of complications among routine method,high speed turbine handpiece and piezosurgery device after extraction of impacted wisdom teeth].
abstract: OBJECTIVE
  To investigate complications in extraction of complicated impacted wisdom teeth whose root apex near to the inferior alveolar nerve(IAN) by using routine method(chisels),high speed turbine handpiece and piezosurgery device respectively.
  
  
  METHODS
  Three hundred qualified patients with impacted wisdom teeth were divided into three groups randomly,one hundred patients in group A were extracted by routine method, one hundred patients in group B were extracted by high speed turbine handpiece, and one hundred patients in group C were extracted by piezosurgery device. The operation time, postoperative pain duration,dry socket and IAN injury were compared between each two groups. All statistical analysis was performed using SPSS 13.0 software package. Differences between groups were compared using a paired t test (quantitative data) or Chi-square test (qualitative data).
  
  
  RESULTS
  The operation time in group A was(14.12±0.12)min, (7.22±0.15)min in group B, (25.23±0.32)min in group C; Significant difference was found between group A and group B(P<0.05), group B and group C(P<0.05),group A and group C(P<0.05).Postoperative pain duration was(62.15±1.51)h in group A, (48.23±1.23)h in group B, (14.34±O.80)h in group C; Significant difference was found between group A and group B(P<0.05), group B and group C(P<0.05),group A and group C(P<0.05).9 patients developed dry socket in group A, 2 in group B, and 1 in group C; Significant difference was found between group A and group B(P<0.05), group A and group C(P<0.05). Six patients had IAN injury in group A, 2 in group B, 0 in group C. Significant difference was found between group A and group C.
  
  
  CONCLUSIONS
  Compared with routine method, high speed turbine is better in extraction of impacted wisdom teeth, which can shorten operation time, lessen postoperative complications. Although there was longer operation time compared with group A and B, piezosurgery device is more effective in reducing postoperative complications.
authors.affiliation: Department of Dentistry, Nanshan Hospital of Guangdong Medical College, Guangdong Province, China. zhdentist@yahoo.com.cn
authors.forename: Zhao-zhong
authors.initials: ZZ
authors.lastname: Guo
authors.forename: Heng
authors.initials: H
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Yin
authors.initials: Y
authors.lastname: Liu
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Chun-xia
authors.initials: CX
authors.lastname: Yuan
authors.forename: Xue
authors.initials: X
authors.lastname: Liu
mesh_terms: D004368:Dry Socket; D006801:Humans; D008964:Molar, Third; D010149:Postoperative Pain; D059745:Piezosurgery; D011183:Postoperative Complications; D014081:Tooth Extraction; D014095:Tooth, Impacted