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Questions and Answers
What is the main reason for the loss of deciduous teeth?
What is the main reason for the loss of deciduous teeth?
At what age does the emergence of the first permanent tooth occur?
At what age does the emergence of the first permanent tooth occur?
What is the mechanism of shedding of deciduous teeth?
What is the mechanism of shedding of deciduous teeth?
Where does the resorption of deciduous teeth start in anterior teeth?
Where does the resorption of deciduous teeth start in anterior teeth?
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What happens to the roots of deciduous teeth during shedding?
What happens to the roots of deciduous teeth during shedding?
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When does the resorption of deciduous molars occur?
When does the resorption of deciduous molars occur?
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What is the purpose of shedding of deciduous teeth?
What is the purpose of shedding of deciduous teeth?
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What is responsible for the resorption of PDL during shedding?
What is responsible for the resorption of PDL during shedding?
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What is the first step in the shedding of posterior deciduous teeth?
What is the first step in the shedding of posterior deciduous teeth?
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What type of cells are responsible for resorbing bone and dentin during tooth shedding?
What type of cells are responsible for resorbing bone and dentin during tooth shedding?
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What is the main function of fibroclasts during tooth shedding?
What is the main function of fibroclasts during tooth shedding?
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What type of cells are responsible for resorbing bone during tooth shedding?
What type of cells are responsible for resorbing bone during tooth shedding?
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What is the term used to describe the abnormal resorption of dental hard tissue?
What is the term used to describe the abnormal resorption of dental hard tissue?
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What is the origin of odontoclasts?
What is the origin of odontoclasts?
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Study Notes
Shedding of Teeth
- Shedding or exfoliation is the normal physiological process of eliminating deciduous teeth.
- The loss of deciduous teeth is mainly due to the resorption of their roots.
Need of Shedding
- With the growth of a child, the jaw grows, but the deciduous teeth cannot.
- The muscle of mastication increases in size and power of contraction.
- The PDL of deciduous teeth cannot withstand the masticatory forces.
Rules of "Sixes" in Dental Development
- 6 weeks old in utero: beginning of dental development
- 6 months old: emergence of the first primary tooth
- 6 years old: emergence of the first permanent tooth
Mechanism of Shedding
- Pressure of the succeeding permanent teeth
- Increase in force of mastication
- Action of odontoclast (cementoclast for cementum and dentinoclast for dentin)
- Action of osteoclast, which resorbs bone
- PDL is resorbed by fibroclast
Pattern of Shedding
Anterior Teeth
- Resorption of deciduous teeth starts from the lingual side
- Later developing tooth occupies a position directly apical to deciduous teeth
Posterior Teeth
- Resorption of deciduous teeth begins on the inner surface of the roots of molar
- Resorption occurs long before the deciduous molars are shed
Process of Shedding
- First step: pressure from successional teeth
- Leads to activation of osteoclast, odontoclast, and fibroclast
Osteoclasts
- Bone-resorbing cells derived from the monocyte-macrophage lineage
- Giant multinuclear cells with 4-20 nuclei
- Resorb hard tissue by separating mineral from the collagen matrix through the action of hydrolytic enzymes
- Resorption occurs at the ruffled border, which greatly increases the surface area of the osteoclast in contact with bone
Odontoclasts
- Origin: circulating monocytes
- Function: resorption of all dental hard tissue, including enamel
Fibroclast/Fibroblast
- PDL is resorbed by fibroclast
- Resorbs collagen fibers
Clinical Considerations
- Remnants of the root of deciduous teeth
- Retained/submerged deciduous teeth
- Pathological resorption
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Description
Learn about the normal physiological process of shedding or exfoliation of deciduous teeth, its causes and effects, and the need for shedding in children.
