title: Cementogenesis in Patients with Localized Aggressive Periodontitis.
abstract: OBJECTIVE
  The aim of this study was to determine the cementum thickness in the first molars of patients with localized aggressive periodontitis (LAP) compared to healthy individuals.
  
  
  METHODS
  This case-control study compared eight first molar teeth affected by LAP with eight third molar teeth of healthy individuals. The teeth were disinfected by immersion in 10% buffered formalin solution for three days and were then sectioned. External mesial root surfaces (middle one-third) were evaluated under a stereomicroscope by a blinded pathologist to determine the mean thickness of cementum. SPSS software (version 16.0) and t-test were used for statistical analysis.
  
  
  RESULTS
  Histological examination revealed a significant difference between the two groups in terms of the amount of cementogenesis (P<0.001) .The thickness of cementum was higher in the control group (105.16±11.5 μm) than in LAP patients (86.44±7.3 μm).
  
  
  CONCLUSIONS
  This study demonstrated the presence of cementum hypoplasia in mesial root surfaces of first molars affected by LAP.
authors.affiliation: Associate Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Periodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mojgan
authors.initials: M
authors.lastname: Paknejad
authors.affiliation: Associate Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Periodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Afshin
authors.initials: A
authors.lastname: Khorsand
authors.affiliation: Assistant Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Periodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Siamak
authors.initials: S
authors.lastname: Yaghobee
authors.affiliation: Oral and Maxillofacial Pathologist, Private Practice, Tehran, Iran.
authors.forename: Pooriya
authors.initials: P
authors.lastname: Motahhari
authors.affiliation: Postgraduate Student, Department of Oral and Maxillofacial Pathology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Arghavan
authors.initials: A
authors.lastname: Etebarian
authors.affiliation: Postgraduate Student, Department of Periodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Bayani
authors.affiliation: Dental Student, Azad University of Medical Sciences, School of Dentistry, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Mehrfard
keywords: Aggressive Periodontitis; Cementogenesis; Dental Cementum; Hypoplasia