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Periodontium
The structures surrounding and supporting the tooth. Periodontium includes the gum (GINGIVA), the alveolar bone (ALVEOLAR PROCESS), the DENTAL CEMENTUM, and the PERIODONTAL LIGAMENT.
Year introduced: TOOTH SUPPORTING STRUCTURES was heading 1965-1967
Periodontal Ligament
The fibrous CONNECTIVE TISSUE surrounding the TOOTH ROOT, separating it from and attaching it to the alveolar bone (ALVEOLAR PROCESS).
Year introduced: 1973(1972)
Periodontal Atrophy
Degradation or wasting of the PERIODONTIUM tissues that may involve the gum (GINGIVA), the alveolar bone (ALVEOLAR PROCESS), the DENTAL CEMENTUM, or the PERIODONTAL LIGAMENT.
Year introduced: 2009
Periapical Tissue
Tissue surrounding the apex of a tooth, including the apical portion of the periodontal membrane and alveolar bone.