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Questions and Answers
What is defined as the physiological movement of teeth from their developmental position through the soft tissues to their functional position in the oral cavity?
What is defined as the physiological movement of teeth from their developmental position through the soft tissues to their functional position in the oral cavity?
Which phase of tooth eruption begins during the bell stage and involves the movement of the developing tooth within the alveolar bone?
Which phase of tooth eruption begins during the bell stage and involves the movement of the developing tooth within the alveolar bone?
During which phase does a tooth move through the alveolar bone and soft tissue until it reaches occlusion?
During which phase does a tooth move through the alveolar bone and soft tissue until it reaches occlusion?
What initiates the process of exfoliation of primary teeth?
What initiates the process of exfoliation of primary teeth?
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What forms the reduced enamel epithelium after amelogenesis is completed?
What forms the reduced enamel epithelium after amelogenesis is completed?
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Which theory of tooth eruption suggests that the tooth crown is elevated by root development?
Which theory of tooth eruption suggests that the tooth crown is elevated by root development?
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What is the role of odontoclasts during the process of tooth exfoliation?
What is the role of odontoclasts during the process of tooth exfoliation?
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Which theory related to tooth eruption is characterized by signals between the dental follicle and reduced enamel epithelium?
Which theory related to tooth eruption is characterized by signals between the dental follicle and reduced enamel epithelium?
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What process occurs throughout life, even after a tooth has been extracted, to maintain occlusion?
What process occurs throughout life, even after a tooth has been extracted, to maintain occlusion?
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Study Notes
Tooth Eruption and Exfoliation
- Eruption: The physiological movement of teeth from their developing position to their functional position in the mouth. It's a continuous process throughout life.
- Exfoliation: The physiological resorption and loss of primary teeth, also a continuous process.
Phases of Tooth Eruption
- Pre-eruptive: Movement of the developing tooth within the jawbone (alveolar bone). This stage starts during the bell stage of tooth development, and involves reshaping the bone crypt to accommodate the growing tooth. This is the movement of the developing tooth inside the bone crypt.
- Active Eruption: The tooth moves through the bone and the soft tissue until it reaches its final occlusal position. This stage occurs roughly simultaneously with root formation.
- Post-eruptive: Ongoing movement of the tooth to maintain a functional bite and compensate for wear and growth throughout life.
Dento-gingival Junction Origin
- The structure forms from the reduced enamel epithelium.
- As amelogenesis (enamel formation) finishes, the ameloblasts reduce in size and fuse with elements of the outer enamel epithelium, stratum intermedium, and remaining stellate reticulum to create the reduced enamel epithelium.
- This structure shields the developing tooth crown, merges with the oral mucosa (forms the pathway for eruption), and forms the dento-gingival junction, preventing the oral cavity from getting into the body.
Tooth Exfoliation
- Successor eruption: Development and eruption of permanent teeth that replace primary teeth initiates their resorption.
- Resorption: Odontoclasts resorb the roots of primary teeth, progressing towards the crown. This happens gradually.
- Masticatory forces: These forces facilitate primary tooth exfoliation, albeit their role is indirect.
Theories of Tooth Eruption
- Root Formation Theory: The growing root pushes the crown toward the gumline.
- Bone Remodelling Theory: The exact cause of bone resorption is uncertain if it is a cause of or effect from signalling. Dental follicle plays a role in modulating bone changes, not osteoclasts.
- Dental Follicle Theory: Interaction between dental follicle and the reduced enamel epithelium is implicated in bone remodelling and eruption.
- Periodontal Ligament Theory: The supporting ligaments formed by fibroblasts, contribute to the movement during eruption.
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Description
Test your knowledge on the physiological processes of tooth eruption and exfoliation. This quiz covers the phases of tooth development, including pre-eruptive, active, and post-eruptive stages, as well as the concept of the dento-gingival junction. Each phase is crucial for understanding how teeth transition throughout life.
