Shedding Of Deciduous Teeth
Question 1. Write briefly about the shedding of deciduous teeth.
Answer:
Shedding of Deciduous Teeth Definition:
- The physiological process resulting in the elimination of the deciduous dentition is called shedding.
Shedding of Deciduous Teeth Pattern:
- As the permanent incisors, canines, and premolars develop and begin to erupt, they influence the pattern of shedding of the deciduous teeth.
- It depends on the movement of permanent teeth.
- It starts from the lingual aspect as the movement of permanent teeth is formed from lingual to buccal.
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Shedding of Deciduous Teeth Mechanism:
- The shedding of the deciduous teeth is the result of progressive resorption of the roots of teeth and their supporting tissue.
Shedding of Deciduous Teeth Bony socket:
- Osteoclast resorb the bone of the deciduous tooth socket
Shedding of Deciduous Teeth Dental tissue:
- Odentoclasts derive from the monocyte and migrate from blood vessels to the resorption site
- Reduced enamel epithelium of the erupting permanent teeth damages the cementoblasts layer.
- Odontoclasts appear around the roots of deciduous teeth and cause the resorption of dentin, cementum, and even enamel.
- During this coronal pulp appears normal.
- Odontoblast emerges from the pulpal vessels and migrates to the presenting surface to form an odontoclast.
- This causes the resorption of dentin from within.
PDL (Perodontal ligament):
- Factors involved in the resorption of PDL are
- Apoptosis.
- This is induced in response to local cell insult.
- It involves condensation of the cell with its ultimate phagocytosis.
- Pressure from erupting permanent teeth results in some root loss.
- This results in the loss of supporting tissue.
- As the support of the tooth diminishes, the tooth is less able to withstand the increased masticatory forces, thus shedding is accelerated.
- Growth of tire face and jaws and the corresponding enlargement in size.
- This increases the forces applied to the deciduous teeth.
Question 2. Osteoclasts.
Answer:
- Osteoclast is a type of bone cell that removes bone tissue by removing the mineralized matrix of bone.
- They lie in resorption bays called Howship’s lacunae.
- It is a large cell approximately 40 – 100 mm in diameter with 15 – 20 closely packed nuclei.
- Adjacent to the tissue surface, the osteoclast cell membrane consists of deep folds that form a ruffled border.
- At the periphery of this order, the plasma membrane is apposed closely to the bone surface.
- Osteoclasts are rich in acid phosphatase and other lysosomal enzymes.
Osteoclasts Precursor:
- Osteoclasts are derived from hemopoietic cells of the monocyte-macrophage lineage.
Question 3. Odontoclast Cells.
Answer:
- The cells responsible for the removal of dental hard tissue, identical to osteoclasts are called odontoclast.
- They are large, multi-nucleated cells occupying resorption bays on the resorption site.
- The cytoplasm is vacuolated.
- The cell surface adjacent to the resorbing hard tissue forms a ruffled border.
Odontoclasts Formation:
- Odontoclast are derived from the monocyte.
Odontoclasts Function:
- They are involved in the resorption of deciduous teeth.
- They cause the resorption of dentin, cementum, and even enamel with intact pulp.
- Next, at the predentin surface, odontoclast.
- Causes reapportion of dentin from within the pulp.
Question 4. Shedding of deciduous teeth.
Answer:
- The physiologic process resulting in the elimination of deciduous dentition is called “shedding”.
Shedding of Deciduous Teeth Mechanism:
- Osteolcast resorbs the bony socket of the deciduous teeth.
- Odontoclast resorbs the dentin, cementum, enamel, and also dentin from within the pulp.
- PDL is resorbed due to apoptosis, increased masticatory forces, pressure from erupting permanent teeth, and due to growth of the jaw.
- When the resorptive process has advanced so far that the roots cannot any more support the tooth, the tooth is shed.
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