PDL AND ALVEOLAR BONE

The fibers which are most resistant to forces along the longaxis of tooth are :

• Apical fibers

• Oblique fibers

• Transeptal fibers

• Alveolar-Crest fibers

Principle cell type of PDL is:

• Cementoblast

• Rest cell of Malaseez

• Fibroblast

• Osteoblast

The portion of fibers which are inserted into cementum and bone are:

• Principle fibers

• Sharpeys fibers

• collagen fibers

• All of the above

Which periodontal fibers are consistent and are reconstructed even after the destruction of the alveolar bone?

• Apical fibers

• Alveolar-Crest fibers

• Oblique fibers

• Transeptal fibers

In periodontal ligament there is :

• Type 1 collagen

• Type 2 collagen

• Type 3 collagen

• Type 4 collagen

PDL is thinnest at :

• Cemento-Enamel Junction

• Apex

• Middle

• None of the above

Aging changes in PDL are:

• Decrease in no.of cells and increase in collagen fibers

• Increase in no.of cells snd decrease in collagen fibers

• Increase in no.of elastic fibers

• Hyalinization changes

Composition of Bone are:

• 2/3 organic matrix and 1/3 inorganic matrix

• 2/3 inorganic matric and 1/3 organic matrix

• 2/3 inorganic matrix and 2/3 organic matrix

Which bone found predominantly in interadicular and interdental regions:

• Compact bone

• Bundle bone

• Cortical bone

• Cancellous bone

Isolated Areas in which root is denuded of bone and root surface is covered only by periosteum and overlying gingiva:

• Dehiscence

• Fenestration

• periosteum

• Endosteum