1: Anatomy of the Periodontium


Anatomy of the periodontium

Figure 1.1 Longitudinal section through part of a tooth showing healthy periodontal tissues.



Figure 1.2 Dentogingival fibres, alveolar crest fibres and circular fibres in the gingival connective tissue.



Figure 1.3 Interdental area showing transeptal and circular fibre groups in the gingival connective tissue.



Figure 1.4 The periodontal ligament.



Figure 1.5 Bony fenestration and dehiscence.


The periodontal tissues form the supporting structures of the teeth. The principal components of the periodontium are shown in Fig. 1.1:

• Gingivae (including epithelium and connective tissue).
• Periodontal ligament.
• Cementum.
• Alveolar bone.


The gingivae in health are pink and firm with a knife-edge appearance, scalloped around the teeth. In certain ethnic groups the gingivae may be pigmented. In health, the gingival margin is a few millimetres coronal to the cement–enamel junction. The gingival sulcus (or crevice) is a shallow groove which may be between 0.5 and 3 mm in depth around a fully erupted tooth. The gingival tissues are keratinised and appear paler pink than sites of non-keratinised oral epithelium.

Gingival epithelium

The gingival epithelium comprises (Fig. 1.1):

• Oral epithelium (OE).
• Oral sulcular epithelium (SE).
• Junctional epithelium (JE).

The gingival sulcus is lined by SE and JE.


Oral epithelium

• The OE is an orthokeratinised, stratified, squamous/>

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Jan 14, 2015 | Posted by in Periodontics | Comments Off on 1: Anatomy of the Periodontium
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