title: The Effect of Root Coating with Titanium on Prevention of Root Resorption in Avulsed Teeth: An Animal Study.
abstract: BACKGROUND
  Tooth avulsion is a real dental emergency. If immediate replantation is not performed, the avulsed tooth may be lost due to inflammatory or replacement resorption. This animal study aimed to evaluate the bone response to the titanium coating of the root surface as an artificial barrier, and prevention of resorption of avulsed teeth.
  
  
  METHODS
  This experimental study was conducted on four male dogs. The dogs were randomly divided into two groups for assessment at two and eight weeks. Four teeth were extracted in each animal. The root surfaces of the test group were coated with a titanium layer using the Electron Beam Deposition system. After 24 h, replantation of the teeth was performed. Two animals were sacrificed after two weeks and the remaining dogs were killed after eight weeks. The presence of inflammation, inflammatory resorption, replacement resorption, periodontal regeneration, periapical granuloma and ankylosis were evaluated through histological analyses.
  
  
  RESULTS
  Inflammatory root resorption was not present in any tooth except one tooth in the coated group after eight weeks. Replacement resorption was noted just in three of the non-coated teeth after two weeks and two teeth after eight weeks. The McNemar's test revealed that the frequency of replacement resorption in the non-coated group was significantly higher than the coated group (P=0.031).
  
  
  CONCLUSIONS
  Based on the results of this study, it seems that coating the root surfaces of avulsed teeth with titanium may control the replacement root resorption.
authors: Endodontist, Private Practice, Tehran, Iran.
authors: Azar
authors: A
authors: Heydari
authors: Department of Orthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Soodeh
authors: S
authors: Tahmasbi
authors: Dentofacial Deformities Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Mohammadreza
authors: M
authors: Badiee
authors: Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.
authors: SeyedSadra
authors: S
authors: Izadi
authors: Department of Oral and Maxillofacial Pathology, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Fatemeh
authors: F
authors: Mashhadi Abbas
authors: Dental School, Tehran University of Medical Sciences, Tehran, Iran.
authors: Sepideh
authors: S
authors: Mokhtari
keywords: Avulsion; Root Resorption; Titanium Coating