title: Effect of ED-71, a New Active Vitamin D Analog, on Bone Formation in an Orthopedically Expanded Suture in Rats. A Histomorphometric Study.
abstract: OBJECTIVE
  The aim of this experimental study was to evaluate the effects of ED-71, a new active vitamin D analog, on bone regeneration in response to expansion of the mid-palatal suture, in rats, histomorphometrically.
  
  
  METHODS
  Sixteen male 50-60 days old Wistar rats were separated into two equal groups (control and experimental). Both groups were subjected to expansion, and 30 grams of force was applied to the maxillary incisors with a helical-spring. Experimental group was treated with single-dose ED-71 (0.8 mug/kg body weight) in the mid-palatal suture locally and eight control animals received vehicle solution. Bone regeneration in the mid-palatal suture was evaluated by bone histomorphometric method and mineralized area (Md.Ar), fibrosis area (Fb.Ar), mineralized area/fibrosis area (Md.Ar/Fb.Ar), bone area (B.Ar) and osteoblast number (N.Ob) parameters were evaluated. Mann Whitney-U test was used for statistical evaluation at P<.05 level.
  
  
  RESULTS
  Statistical analysis showed significant differences between groups for all investigated histomorphometric parameters. Md.Ar (P<.001), Md.Ar/Fb.Ar (P<.001), B.Ar (P<.01) and N.Ob (P<.001) parameters were significantly increased and Fb.Ar (P<.001) measurement was significantly decreased in experimental group. ED-71 group with a mean of 24.55+/-6.47 showed statistically higher N.Ob than the control group (mean N.Ob: 12.82+/-5.81).
  
  
  CONCLUSIONS
  ED-71 has positive effects on early phase of bone regeneration in the mid-palatal suture in response to expansion and may be beneficial in routine maxillary expansion procedures.
authors.affiliation: Associate Professor and Chair, Department of Orthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.
authors.forename: Tancan
authors.initials: T
authors.lastname: Uysal
authors.forename: Mihri
authors.initials: M
authors.lastname: Amasyali
authors.forename: Sukru
authors.initials: S
authors.lastname: Enhos
authors.forename: Mehmet Fatih
authors.initials: MF
authors.lastname: Sonmez
authors.forename: Deniz
authors.initials: D
authors.lastname: Sagdic