- NEED HELP? CALL US NOW
- +919995411505
- [email protected]
Past Dadh Questions Part 3
1. The middle to the apical third of the root surface and furcation are covered by
- Acellular extrinsic fiber cementum
- Acellular intrinsic fiber cementum
- Cellular intrinsic fiber cementum
- Cellular intrinsic fiber cementum
ANSWER c
Cellular intrinsic fiber cementum:
- This consists of intrinsic fibers and cementocytes, without any inserting PDL fibers.
- It is principally a reparative cementum and is seen, for example, repairing small resorption lacunae on the cementum.
- In this type of cementum the cellular intrinsic fiber cementum alternates with acellular extrinsic fiber cementum. It is formed by cementoblasts and fibroblasts.
- It appears primarily on apical third of the root and furcation areas.
2. Inorganic content of the cementum
- 45 to 50%
- 50 to 55%
- 55 to 60%
- 60 to 65%
ANSWER a
- Cementum is composed of approximately 45-50% inorganic material by weight, primarily hydroxyapatite.
- The organic component includes multiple types of collagens and noncollagenous proteins such as bone sialoprotein and osteopontin, that may regulate mineralization and other properties.
3. Which of the following is the best mineralized?
- Cementoid
- Cellular cementum
- Acellular cementum
- Incremental lines
ANSWER a
CEMENTOID TISSUE
- The uncalcified matrix is called cementoid.
- Mineralization of cementoid is a highly ordered event & not the random precipitation of ions into an organic matrix.
- Fibers are embedded in the cementum & serve to attach the tooth to surrounding bone.
- Their embedded portions are known as Sharpey’s fibers.
4. Reestablishing of former outline of root surface is
- Anatomic repair
- Functional repair
- Physiologic repair
- hyperplasia
ANSWER a
ANATOMIC REPAIR
- Generally occurs when the degree of destruction is low.
- The root outline is re- established as it was before cemental resorption.
FUNCTIONAL REPAIR
- Occurs in cases of large cemental resorption or destruction.
- To maintain the width of periodontal ligament, the adjacent alveolar bone grows and takes the shape of defect following the root surface.
- This is done to improve the function of tooth.
5. Anchoring fibrils are composed of
- Type V and VII collagen
- Type I and III collagen
- Type IV collagen
- Type IV and III collagen
ANSWER a
Anchoring fibrils (composed largely of type VII collagen) extend from the basal lamina of epithelial cells and attach to the lamina reticularis (also known as the reticular lamina) by wrapping around the reticular fiber (collagen III) bundles. The basal lamina and lamina reticularis together make up the basement membrane. Anchoring fibrils are essential to the functional integrity of the dermoepidermal junction.
Anchoring fibrils are adhesive suprastructures that ensure the connection of the epidermal basement membrane with the dermal extracellular matrix. The fibrils represent polymers of collagen VII, the major structural fibril component, but may also contain other proteins.
It also contains type V COLLEN FIBERS also
