12 - histogenesis, morphology and physioloy of periodontal ligament. Anatomy and chemical composition. Blood supply, lymphatic network and innervation. Characteristics of periodontal ligament in childhood

Histogenesis, morphology and physiology of periodontal ligament

• derived from dental follicle

• it’s dense connective tissue between cementum and alveolar bone

• contains sharpey’s fibres arranged in bundles for mechanical support

Anatomy and chemical composition of peridontal ligament

• Made up of collagen type 1 and 3

• Ground substance - proteoglycans and glycoproteins

• made up of fibroblasts, osteoblasts, cementoblasts, mesenchymal cells and immune cells

Dento-alveolar fibres

• alveolar crest group

• horizontal fibre group

• oblique fibre group

• apical fibre group

• interradicular group

A house of apricot icecream

what are the dento alevolar fibres that make up periodontal ligament

• alveolar crest group

• horizontal fibre group

• oblique fibre group

• apical fibre group

• interradicular group

A house of apricot icecream

Blood supply of periodontal ligament

• branches from superior and inferior alveolar arteries, dense capillary network

Lymphatic network of periodontal ligament

• drain into submandibular and deep cervical lymph nodes

innervation of periodontal ligament

• sensory fibres from trigeminal nerve detect pain

Characteristics of periodontal ligament in childhood

• thicker in younger individuals and reduces with age

• fibres are less organised

• high cellular activity