title: The effect of corticision on root resorption with heavy and light forces.
abstract: OBJECTIVE
  To investigate the association between corticision and different force magnitudes with the amount of root resorption.
  
  
  METHODS
  Forty-four male Wistar rats (7 week old) were evaluated after an orthodontic spring delivering either 10 or 100 g was placed on the left maxillary first molars to move molars mesially. Experimental rats were divided into four groups, with 11 animals in each group: (1) LF, no corticision and 10 g of orthodontic force; (2) LFC, corticision and 10 g of force; (3) HF, no corticision and 100 g of force; and (4) HFC, corticision and 100 g of force. Contralateral sides were used as unloaded controls. The total duration of the experimental period was 14 days. Two-dimensional (histomorphometric) and three-dimensional (volumetric, micro-focus X-ray computed tomography [microCT]) analysis of root craters were performed on maxillary first molars.
  
  
  RESULTS
  Histomorphometric and microCT analysis revealed a significant amount of resorptive areas in the experimental groups when compared to unloaded controls. However, no significant difference was detected in the amount of resorption among the four experimental groups.
  
  
  CONCLUSIONS
  At day 14, neither the amount of force nor the cortical incision caused significant effect on root resorption that was registered by histomorphometric or microCT analysis.
authors.affiliation: a  Private practice, Avon, Conn.
authors.forename: Christopher
authors.initials: C
authors.lastname: Murphy
authors.affiliation: b  Research Fellow, Department of Craniofacial Sciences, University of Connecticut Health Center, Farmington, Conn.
authors.forename: Zana
authors.initials: Z
authors.lastname: Kalajzic
authors.affiliation: c  Assistant Professor, Department of Craniofacial Sciences, University of Connecticut Health Center, Farmington, Conn.
authors.forename: Taranpreet
authors.initials: T
authors.lastname: Chandhoke
authors.affiliation: d  Assistant Professor, Department of Orthodontics and Oral Facial Genetics, Indiana University School of Dentistry, Indianapolis, Ind.
authors.forename: Achint
authors.initials: A
authors.lastname: Utreja
authors.affiliation: e  Professor and Department Chair, Department of Craniofacial Sciences, University of Connecticut Health Center, Farmington, Conn.
authors.forename: Ravindra
authors.initials: R
authors.lastname: Nanda
authors.affiliation: f  Associate Professor, Department of Craniofacial Sciences, University of Connecticut Health Center, Farmington, Conn.
authors.forename: Flavio
authors.initials: F
authors.lastname: Uribe
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D003799:Dental Stress Analysis; D008297:Male; D008963:Molar; D051381:Rats; D017208:Rats, Wistar; D012391:Root Resorption; D014057:Tomography, X-Ray Computed; D014087:Tooth Movement Techniques; D014092:Tooth Root / Q000000981:diagnostic imaging
keywords: Corticision; Orthodontic force; Root resorption; Tooth movement
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