title: The influence of traumatic occlusion on the repair process for teeth following subluxation.
abstract: OBJECTIVE
  Traumatic occlusion (TO) can cause morphofunctional alterations that interfere in the homeostasis of the periodontium. The aim of this study was to assess the influence of TO on the periodontal repair process for teeth following subluxation.
  
  
  METHODS
  Ninety Wistar rats aged 12 weeks were divided into three groups: control (C), subluxation (S) and subluxation with traumatic occlusion (S+TO). Subluxation was created with an impact force of 900 cN applied by a tensiometer and TO was created with a direct composite resin filling. Healing after two experimental periods of 7 and 21 days was assessed histologically. The Kruskal-Wallis and Dunn post hoc tests were used for group comparison.
  
  
  RESULTS
  At 7 days, there was a significant increase in periodontal ligament (PDL) width and amorphous fundamental substance, as well as a significant bone area reduction in groups S and S+TO. After 21 days, there was a significant PDL width increase in group S+TO, and in the percentage of collagen fibres in group S, whereas group S+TO showed a 52% bone area reduction compared to the same group at 7 days. Subluxation with or without TO caused only superficial root resorption. However, only group S+TO showed damage to the repair process of resorbed root areas after 21 days.
  
  
  CONCLUSIONS
  TO can increase damage to the PDL after subluxation and it can also delay the repair process after PDL damage.
authors.affiliation: Surgery and Integrated Clinics, Faculdade de Odontologia, UNESP-Universidade Estadual Paulista, Araçatuba, Araçatuba, São Paulo, Brazil.
authors.forename: Marina Fuzette
authors.identifier: http://orcid.org/0000-0003-3305-3080
authors.initials: MF
authors.lastname: Amaral
authors.affiliation: Surgery and Integrated Clinics, Faculdade de Odontologia, UNESP-Universidade Estadual Paulista, Araçatuba, Araçatuba, São Paulo, Brazil.
authors.forename: Wilson Roberto
authors.initials: WR
authors.lastname: Poi
authors.affiliation: Surgery and Integrated Clinics, Faculdade de Odontologia, UNESP-Universidade Estadual Paulista, Araçatuba, Araçatuba, São Paulo, Brazil.
authors.forename: Caio Vinicius Lourenço
authors.initials: CVL
authors.lastname: Debortoli
authors.affiliation: Surgery and Integrated Clinics, Faculdade de Odontologia, UNESP-Universidade Estadual Paulista, Araçatuba, Araçatuba, São Paulo, Brazil.
authors.forename: Sônia Regina
authors.initials: SR
authors.lastname: Panzarini
authors.affiliation: Surgery and Integrated Clinics, Faculdade de Odontologia, UNESP-Universidade Estadual Paulista, Araçatuba, Araçatuba, São Paulo, Brazil.
authors.forename: Daniela Atili
authors.initials: DA
authors.lastname: Brandini
mesh_terms: D000818:Animals; D003188:Composite Resins; D003769:Dental Occlusion, Traumatic / Q000473:pathology*; D003793:Dental Restoration, Permanent; D005260:Female; D010513:Periodontal Ligament / Q000473:pathology*; D051381:Rats; D017208:Rats, Wistar; D012391:Root Resorption / Q000473:pathology*; D014084:Tooth Avulsion / Q000473:pathology*; D014945:Wound Healing / Q000502:physiology*
chemical_list: D003188:Composite Resins
keywords: periodontal ligament healing; subluxation; traumatic occlusion