Questions and Answers
What type of movement occurs in the posteruptive stage of tooth eruption?
What leads the way in the eruption of a permanent tooth?
What is the primary role of the periodontal ligament in tooth eruption?
What occurs during the posteruptive stage between the ages of 14 and 18 years?
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What is the mechanism of axial tooth movement during eruption?
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What is the name of the process where the root grows in length, forcing the tooth into the oral cavity?
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What is the outcome of the cycle of bone development in the alveolar bone?
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What is the function of the gubernacular cord?
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What is the significance of the interradicular bone in the eruption process of multirooted teeth?
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What type of tooth movement occurs through bone remodeling and PDL reorganization?
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What is seen in a dried skull that provides evidence of tooth eruption?
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What is the role of osteoblastic and osteoclastic activity in the eruption process?
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What is the effect of vascular pressure in dental tissues on cellular activity?
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What is the result of local osteoclastic activity during tooth eruption?
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What is the characteristic of the post-eruptive stage?
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What is the term for the process of tooth movement into the oral cavity?
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What is the term for the process of movement of a tooth from its developmental position within the jaws to its functional position in the oral cavity?
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Which stage of tooth eruption involves the total bodily movement of the tooth germ?
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What is the principal direction of movement during the eruptive stage of tooth eruption?
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What occurs during the pre-functional stage of tooth eruption?
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Which of the following is NOT a stage of tooth eruption?
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During which stage of tooth eruption does the tooth move from its position within the bone of the jaw to its functional position in occlusion?
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What is the name of the phase that occurs before the tooth begins to erupt?
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In which direction does the tooth tend to move during the eruptive stage?
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Study Notes
Theories of Eruption
- There are four theories of eruption: root growth, bone remodeling, periodontal ligament traction, and vascular pressure in dental tissues.
Mechanisms of Eruption
- Construction and reorganization of periodontal ligament (PDL)
- Formation of the root and deposition of alveolar bone, followed by remodeling of bone overall
- Further influences from tooth/teeth in occlusion and muscle actions
Root Growth
- Increase in root length or root elongation forces the tooth into the oral cavity
Bone Remodeling
- Alveolar process forms in areas where teeth are developing and is deficient in areas where teeth fail to develop
- Alveolar bone changes involve both formation and resorption, dependent on the presence of dental sac or dental follicle
- The cycle of bone development is rhythmic, with instances of osteoblastic followed by osteoclastic activity
Periodontal Ligament Traction
- Periodontal ligament has a role to play, especially towards the end of the eruption
- Contractile fibers play a role in eruption
- Periodontal ligament provides the force required for eruption
Vascular Pressure in Dental Tissues
- Vascular pressures are present in pulpal tissues and periodontal ligament
- Pulsating pressure enhances cellular activity and has a direct eruptive role
Post-Eruptive Stage
- Passive eruption involves gingival recession onto and down the cementum with loss of alveolar-crest bone
Clinical Consideration
- Tooth eruption separates the jaws once the teeth meet in occlusion
- Teeth influence each other mechanically once they meet in occlusion
Post-Eruptive Stage
- The stage begins when the teeth come into occlusion and continues until they are lost or death occurs
- The type of movement is axial and mesial migration
- Acts as a compensatory mechanism, most active between the ages of 14 and 18 years
Tooth Movements Occurring in Eruption
- Axial movement occurs by root growth and bone remodeling
- Drifting (e.g., mesially, laterally) occurs by bone remodeling and PDL reorganization
- Rotatory movement occurs by bone remodeling and PDL reorganization
Stages of Tooth Eruption
- Three stages of tooth eruption: preeruptive, eruptive, and post-eruptive stages
Histology of Tooth Eruption
- The fibrous cord (gubernacular cord) leads the way and breaks down the bone between the tooth and the surface oral epithelium
- The gubernacular cord runs through a canal left in the bony crypt, where the dental lamina extended down to establish the germ for the second tooth
Active Tooth Eruption
- The term active tooth eruption implies the emergence of the crown into the oral cavity
- Divided into three stages: preeruptive, eruptive, and post-eruptive stages
Tooth Eruption
- Defined as the process of movement of a tooth from its developmental position within the jaws to its functional position in the oral cavity
- Can be active or passive
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Description
Understanding the mechanisms and influences of tooth eruption, including root growth, bone remodeling, and periodontal ligament traction. Explore the construction and reorganization of the periodontal ligament and the role of tooth occlusion and muscle actions.
