Root proximity characteristics and type of alveolar bone loss: a case-control study.

Objective: This study assessed root proximity (RP) in patients with and without periodontitis in terms of prevalence, distribution, location along the root, width and severity, and explored the role of RP characteristics in the type of alveolar bone loss (horizontal or angular).

Materials And Methods: Root proximity was studied in the interdental spaces of 250 patients with periodontitis and 80 patients without disease. Linear measurements were performed in digitized radiographs.