title: [Effects of different TiNi-SMA distractor on the height of alveolar ridge augmentation].
abstract: OBJECTIVE
  To discuss the effects of titanium nickel shape memory alloy (TiNi-SMA) distractor with different stretching force and different distance between two fixed ends on the height of alveolar ridge augmentation.
  
  
  METHODS
  The mini distractors were all made of TiNi-SMA wire. The maximum stretching force and the distance between two fixed ends according to different distractors (A, B and C) were 20 mm, 700 g; 15 mm, 1000 g; 20 mm, 1000 g. 15 adult mongrel canines were divided into three groups randomly and extracted the mandibular premolars and first molar. One month later, box-shaped osteotomies of the alveolar bone were carried out in the left mandible and the TiNi-SMA distractors were buried. The bone height was measured and the radiographs were taken before and five weeks post operation continuously.
  
  
  RESULTS
  One week post operation, the vertical ridge augmentation of group A, B and C averaged (7.55 +/- 1.02) mm, (4.97 +/- 0.34) mm, (8.54 +/- 0.82) mm and the height remained (7.20 +/- 1.05) mm, (4.93 +/- 0.21) mm, (8.04 +/- 0.78) mm five weeks post operation. There was no statistic difference in the height of alveolar ridge augmentation between Group A and C, but Group B showed significant difference with the other two groups. In each group, the height did not changed significantly with the time. The radiographs showed obvious distraction gap post operation, and the new bone regenerated five weeks later.
  
  
  CONCLUSIONS
  It suggests that in the scope of suitable stretching force, the height of alveolar ridge augmentation was determined by the size of TiNi-SMA distractor, that is to say, determined by the distance between the two fixed ends.
authors.affiliation: Dept. of Stomatology, PLA Genaral Hospital, Beijing, China.
authors.forename: Min
authors.initials: M
authors.lastname: Xie
authors.forename: Min
authors.initials: M
authors.lastname: Hu
authors.forename: Hong-chen
authors.initials: HC
authors.lastname: Liu
authors.forename: Jun
authors.initials: J
authors.lastname: Yao
authors.forename: Hong-zhi
authors.initials: HZ
authors.lastname: Zhou
mesh_terms: D000328:Adult; D000540:Alveolar Ridge Augmentation; D006801:Humans; D008334:Mandible; D009532:Nickel; D019857:Osteogenesis, Distraction; D010027:Osteotomy; D014025:Titanium
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium