Oral histology
Enamel, dentine, pulp, cementum, periodontal ligament and mucosa differ in structure and healing. Link microscopic structure to caries, pain and periodontal disease.
Understand
Enamel is highly mineralised and non-vital; dentine contains tubules; pulp is vascular and innervated. Cementum and periodontal ligament connect the root to alveolar bone, while oral mucosa varies by site.
Assess
Use tissue structure to explain findings: exposed dentine can be sensitive, pulpal inflammation can become painful in a rigid chamber, and attached versus non-keratinised mucosa heals differently.
Apply
Select bonding, preparation and surgical approaches with the substrate in mind. Remember that a histological description and a clinical diagnosis answer different questions; correlate them rather than treating either in isolation.
Key distinctions
The enamel-dentine junction, dentinal tubules and pulpal response explain why a deep lesion can be painful even without an exposed pulp. Periodontal ligament fibres give proprioception and distribute load, and loss of attachment alters mobility. Keratinised and non-keratinised mucosa have different mechanical environments, so the same lesion may present differently by site.
Think through a case
A sensitive cervical surface after gingival recession exposes dentine. The symptom fits tubule fluid movement, but persistent spontaneous pain would require a pulpal assessment too.
The distinction to remember
Do not treat histology as trivia: enamel's inability to remodel, dentine's tubules and pulpal vascularity have direct treatment consequences.
Test your recall
Why is exposed dentine sensitive?
Show answer
Fluid movement within dentinal tubules stimulates pulpal nerve endings.