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Alveolar Bone

Dr. Syed SadatullahCollege of Dentistry

King Khalid UniversityAbha


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Dr.Syed

S

adatullah

King

Khali d

University

Development of Alveolar Bone

Alveolar bone develops from the dental follicle

The ectomesenchymal cells of the dental follicledifferentiate into osteoblasts and lay down the matrixcalled osteoid

Some osteoblasts become embedded in the matrixand are called osteocytes


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Dr.Syed

S

adatullah

King

Khali d

University

The Alveolar Bone

Alveolar bone or alveolar process is that portion ofmaxilla and mandible that supports the roots

If the teeth are lost the alveolar process disappears

It is composed of two parts; the alveolar bone properand the supporting bone


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Dr.Syed

Sadatullah

King

Kha

li d

University

Alveolar Bone


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Dr.Syed

S

adatullah

King

Khali d

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 whichperiodontal fibres are embedded

It is a specialized type of compact bone composed ofbundle bone and Heversian bone

It is referred to as Bundle bone because it regularlypenetrated by Sharpeys fibres of the periodontalligament


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Dr.Syed

S

adatullah

King

Khali d

University

Alveolar Bone


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Dr.Syed

S

adatullah

King

Khali d

University

Bundle Bone


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Dr.Syed

S

adatullah

King

Khali d

University

Radiographically alveolar bone proper is referred to aslamina dura

Lamina dura appears more dense and hence radio-opaque

In a radiograph the widening of lamina dura indicatesperiodontal pathology

In physiological movement of teeth, this bone isreadily resorbed in zones of compression and isformed in zones of tension


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Dr.Syed

S

adatullah

King

Khal

i dUniversity

Radiographic appearance of alveolar bone proper as LaminaDura


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Dr.Syed

S

adatullah

King

Khal

i dUniversity

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 plateson the outer surface and the spongy bone betweenthe cortical plates and the alveolar bone proper


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Dr.Syed

S

adatullah

King

Khal

i dUniversity

Alveolar Bone Proper and SupportingBone


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Dr.Syed

S

adatullah

King

Khal

i dUniversity

Cortical plates (Compact supporting bone)

The compact supporting bone of the alveolar processextends from the alveolar crest to the lower border ofthe socket on the outside surface of the maxilla andmandible

It is also called the cortical bone/plate

The cortical bone has Haversian systems, radiating

lamellae with lacunae and canaliculi


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Dr.Syed

S

adatullah

King

Khali

dUniversity

Haversion system in Compact Bone


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Dr.Syed

S

adatullah

King

Khali

dUniversity

Spongy bone (Cancellous supporting bone)

Cancellous bone is located apically between thealveolar bone proper and the cortical bone

It is also called as spongy bone

It supports and strengthens the alveolar bone proper


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Dr.Syed

S

adatullah

King

Khali

dUniversity

Compact and Cancellous Bone


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Dr.Syed

S

adatullah

King

Khali

dUniversity

Interdental bone

The bone between the roots of adjacent single-rootedor multi-rooted teeth is called interdental bone

Interradicular bone

The bone between the roots of mulitrooted teeth isknown as interradicular bone


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Dr.Syed

S

adatullah

King

Khali

dUniversity

Fenestration

Fenestration is an area of root penetrating the bone inthe apical region

Dehiscence

Dehiscence is an area of root penetrating the bone inthe coronal region


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Dr.Syed

S

adatullah

King

Khali

dUniversity

Fenestration andDehiscence

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