title: [Evaluation of the degree and pattern of alveolar bone defect inaggressive periodontitis using cone-beam CT].
abstract: OBJECTIVE
  To evaluate the degree and pattern of alveolar bone defect in aggressive periodontitis (AgP) using cone-beam CT (CBCT), and to investigate the distribution of alveolar bone defects in aggressive periodontitis.
  
  
  METHODS
  Forty AgP patients (age: 14-36 years, male: 15 cases, female: 25 cases) were selected by simple random method and scanned by CBCT. NNT software was applied to measure the average degree of alveolar bone defects and bone loss types in different regions.
  
  
  RESULTS
  In forty AgP patients, 86.6% (3,769/4,352) sites presented moderate and severe alveolar bone defects. In the maxilla, the molar areas presented the heaviest alveolar bone defect [(6.3±0.7) mm], the canine areas showed the lightest bone loss [(4.8±0.8) mm]. In the mandible, the incisal areas presented the heaviest alveolar bone defect [(5.9±0.9) mm], the canine areas showed the lightest bone loss[(5.1±0.7) mm]. The degree of alveolar bone defect in the areas of maxillary canine, maxillary molars, mandibular premolar was significantly different (P<0.05). The degree of alveolar bone defect in mandibular canine and mandibular molars was significantly differenct (P<0.01). The most serious alveolar bone defect was in the mesial side of maxillary molar [(6.9±0.7) mm] and the mesial side of mandibular incisor [(6.5±1.1) mm]. The oblique bone defects were found in the mesial part of the first molars in mandibula [13.6% (42/308)], the first molars in maxilla [12.0% (39/316)] and the first premolar in maxilla [10.8% (34/316)].
  
  
  CONCLUSIONS
  The alveolar bone defects of generalized AgP patients were serious. The most serious areas were located in the mesial side of maxillary molars and the mesial side of mandibular incisor.
authors.affiliation: Department of Periodontology, School of Stomatology, China Medical University & Liaoning Institute of Dental Research, Shenyang 110002, China.
authors.forename: Song
authors.initials: S
authors.lastname: Ren
authors.affiliation: Department of Periodontology, School of Stomatology, China Medical University & Liaoning Institute of Dental Research, Shenyang 110002, China.
authors.forename: Haijiao
authors.initials: H
authors.lastname: Zhao
authors.affiliation: Department of Periodontology, School of Stomatology, China Medical University & Liaoning Institute of Dental Research, Shenyang 110002, China; Email: yppan@mail.cmu.edu.cn.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Pan
mesh_terms: D000293:Adolescent; D000328:Adult; D010520:Aggressive Periodontitis / Q000000981:diagnostic imaging*; D000539:Alveolar Process / Q000000981:diagnostic imaging*; D001641:Bicuspid; D054893:Cone-Beam Computed Tomography; D003481:Cuspid; D005260:Female; D006801:Humans; D007180:Incisor; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging; D008437:Maxilla / Q000000981:diagnostic imaging; D008963:Molar; D012984:Software