alveolar bone
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Alveolar Bone
Dr. Syed SadatullahCollege of Dentistry
King Khalid UniversityAbha
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
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
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
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
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
Alveolar Bone
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
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
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
Alveolar Bone
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
Bundle Bone
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
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
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
Radiographic appearance of alveolar bone proper as ‘Lamina Dura’
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
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
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
Alveolar Bone Proper and Supporting Bone
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
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
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
Haversion system in Compact Bone
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
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
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
Compact and Cancellous Bone
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
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
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
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
Dr.S
yed S
adatu
llah
Kin
g K
halid
Univ
ersity
Fenestration and Dehiscence
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