Periodontal Ligament
The fibrous connective tissue that suspends the tooth root within the alveolar socket, absorbing occlusal forces and maintaining proprioceptive function.
Full Definition
The periodontal ligament (PDL) consists of principal collagen fibre bundles — including alveolar crest, horizontal, oblique, apical, and interradicular groups — that run between root cementum and alveolar bone proper. It provides mechanical support, nutrient supply via a rich vascular network, and sensory feedback regarding occlusal load. Editors frequently encounter 'PDL' in orthodontic, periodontal, and implant texts; it is important to note that implants lack a PDL, a distinction central to much implant literature.
Usage
Usage note: The abbreviation 'PDL' is widely accepted in clinical and research writing after first-use spell-out. 'Desmodont' is an older term found in European literature and should be preserved when present in translated texts.
In Context
- "Widening of the periodontal ligament space on radiography may indicate occlusal trauma or early periapical pathology." — Dental radiography report
- "Unlike natural teeth, osseointegrated implants lack a periodontal ligament and therefore exhibit no physiological mobility." — Implant dentistry textbook