title: Comparative study between two techniques for alveolar bone loss assessment: A pilot study.
abstract: OBJECTIVE
  To conduct a comparative study between two techniques for assessment of alveolar bone loss.
  
  
  METHODS
  Absolute and relative techniques were evaluated. The sample consisted of 16 radiographs supposed to meet a single criterion: The reference points applied (Cementum-enamel junction (CEJ) alveolar bone crest and root apex) should be visible. Bone height was measured in the selected radiographs as the percentage of root length through both techniques. Data were submitted to the Statistical Package for Social Science software. Results obtained by both methods were converted into bone loss index values and then categorized. Sensitivity and specificity of the relative technique, compared to the absolute technique, were calculated. Wilcoxon test and the Bland and Altman's method were employed for comparisons. Significance level was set at 5%.
  
  
  RESULTS
  For the absolute and relative techniques, means of bone loss index were respectively of 4.81 (±2.25) and 4.75 (±1.80). Bone loss index ≥6 (alveolar bone loss ≥50%) was found in 5 (31.2%) teeth, in the absolute technique, and in 4 (25%) teeth, according to the relative technique. There was no statistically significant difference between both methods (P>0.05). According to the Bland and Altman's method, it was verified a bias of 0.06, and limits of upper and lower agreement of, respectively, 1.58 and -1.45. Sensitivity of 0.8 and specificity of 1 were found for the relative technique compared to the absolute one.
  
  
  CONCLUSIONS
  There was no significant difference between the techniques evaluated, and the relative technique was found to be reliable for measuring alveolar bone loss.
authors: Department of Periodontology, Faculty of Odontology, Rio de Janeiro State University, Rio de Janeiro, Brazil.
authors: Ronaldo
authors: R
authors: Lira-Júnior
authors: Irlan de Almeida
authors: Ide A
authors: Freires
authors: Isabelle Linsmacêdo
authors: IL
authors: de Oliveira
authors: Ennyo Sobral Crispim
authors: ES
authors: da Silva
authors: Severinocelestino
authors: S
authors: da Silva
authors: Roberto Lira
authors: RL
authors: de Brito
keywords: Alveolar bone loss; periodontal disease; periodontics
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