title: Correlation between residual ridge resorption and radiomorphometric indices.
abstract: OBJECTIVE
  The study evaluated the relationship between residual ridge resorption (RRR) and radiomorphometric indices, including mandibular cortical index (MCI), mandibular cortical width (MCW) and panoramic mandibular index (PMI), along with demographic factors.
  
  
  METHODS
  Panoramic radiographs of 1863 patients over 20 years of age were assessed. Gender, age and dental status of each patient were recorded. Relationships between RRR and demographic factors and radiomorphometric indices were evaluated using chi-square and Fisher's exact tests with level of significance of p = 0.05.
  
  
  RESULTS
  Residual ridge resorption was not affected by gender (p > 0.05), but was more frequently seen in patients over the age of 50 compared with those below 49 years of age (p < 0.001). RRR was significantly associated with edentulism (p < 0.001) and with severe erosions of endosteal margin of mandible (p < 0.05). RRR was more frequently seen in patients with PMI below 0.30 (p < 0.001) and with MCW below 3 mm in 50- to 69-year-old age group (p < 0.001).
  
  
  CONCLUSIONS
  Patients younger than 50 years of age who demonstrate severe erosions of endosteal margin of mandible and have MCW < 3 mm and PMI < 0.30 appear to be suitable candidates for early implant placement or for maintaining roots or natural teeth to preserve bone, regardless of gender.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Baskent University, Ankara, Turkey.
authors.forename: Pervin
authors.initials: P
authors.lastname: Imirzalioglu
authors.forename: Bulem
authors.initials: B
authors.lastname: Yuzugullu
authors.forename: Ayse
authors.initials: A
authors.lastname: Gulsahi
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging*; D015519:Bone Density / Q000502:physiology; D001862:Bone Resorption / Q000000981:diagnostic imaging; D002508:Cephalometry / Q000379:methods; D003817:Dentition; D005260:Female; D006801:Humans; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging; D007576:Jaw, Edentulous, Partially / Q000000981:diagnostic imaging; D008297:Male; D008336:Mandibular Diseases / Q000000981:diagnostic imaging*; D008875:Middle Aged; D019252:Radiography, Dental, Digital / Q000379:methods; D011862:Radiography, Panoramic / Q000379:methods; D012737:Sex Factors; D055815:Young Adult