Brief anatomy and histology of alveolar bone

1. Alveolar Bone Dr. Syed Sadatullah College of Dentistry King Khalid University Abha

2. Dr.Syed Sadatullah King Khalid University Development of Alveolar Bone Alveolar bone develops from the dental follicle The ectomesenchymal cells of the dental follicle differentiate into osteoblasts and lay down the matrix called osteoid Some osteoblasts become embedded in the matrix and are called osteocytes

3. Dr.Syed Sadatullah King Khalid University The Alveolar Bone Alveolar bone or alveolar process is that portion of maxilla and mandible that supports the roots If the teeth are lost the alveolar process disappears It is composed of two parts; the alveolar bone proper and the supporting bone

4. Dr.Syed Sadatullah King Khalid University Alveolar Bone

5. Dr.Syed Sadatullah King Khalid University Alveolar Bone Proper Alveolar bone proper is that part of alveolar bone that lines the sockets It is a thin lamella of compact bone in which periodontal fibres are embedded It is a specialized type of compact bone composed of bundle bone and Heversian bone It is referred to as Bundle bone because it regularly penetrated by Sharpey’s fibres of the periodontal ligament

6. Dr.Syed Sadatullah King Khalid University Alveolar Bone

7. Dr.Syed Sadatullah King Khalid University Bundle Bone

8. Dr.Syed Sadatullah King Khalid University Radiographically alveolar bone proper is referred to as lamina dura Lamina dura appears more dense and hence radio-opaque In a radiograph the widening of lamina dura indicates periodontal pathology In physiological movement of teeth, this bone is readily resorbed in zones of compression and is formed in zones of tension

9. Dr.Syed Sadatullah King Khalid University Radiographic appearance of alveolar bone proper as ‘Lamina Dura’

10. Dr.Syed Sadatullah King Khalid University Supporting bone The remainder of the alveolar process below the alveolar bone proper is called the supporting bone It is attached to the alveolar bone proper Supporting bone includes the compact cortical plates on the outer surface and the spongy bone between the cortical plates and the alveolar bone proper

11. Dr.Syed Sadatullah King Khalid University Alveolar Bone Proper and Supporting Bone

12. Dr.Syed Sadatullah King Khalid University Cortical plates (Compact supporting bone) The compact supporting bone of the alveolar process extends from the alveolar crest to the lower border of the socket on the outside surface of the maxilla and mandible It is also called the cortical bone/plate The cortical bone has Haversian systems, radiating lamellae with lacunae and canaliculi

13. Dr.Syed Sadatullah King Khalid University Haversion system in Compact Bone

14. Dr.Syed Sadatullah King Khalid University Spongy bone (Cancellous supporting bone) Cancellous bone is located apically between the alveolar bone proper and the cortical bone It is also called as spongy bone It supports and strengthens the alveolar bone proper

15. Dr.Syed Sadatullah King Khalid University Compact and Cancellous Bone

16. Dr.Syed Sadatullah King Khalid University Interdental bone The bone between the roots of adjacent single-rooted or multi-rooted teeth is called interdental bone Interradicular bone The bone between the roots of mulitrooted teeth is known as interradicular bone

17. Dr.Syed Sadatullah King Khalid University Fenestration Fenestration is an area of root penetrating the bone in the apical region Dehiscence Dehiscence is an area of root penetrating the bone in the coronal region

18. Dr.Syed Sadatullah King Khalid University Fenestration and Dehiscence