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What type of dentition is characterized by the presence of two sets of teeth?
What is the age range during which mixed dentition occurs?
What is the direction of movement during the eruptive phase of tooth movement?
What occurs during the pre-eruptive stage of tooth movement?
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Where do permanent anterior tooth germs develop in relation to primary anterior teeth?
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What happens to the size of the crown during eccentric growth?
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What is the term for the shedding of primary teeth?
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What is the stage of tooth movement characterized by bone resorption and bone apposition?
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At what rate does the movement of tooth take place during eruption?
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What is the primary cause of shedding of deciduous teeth?
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What is the main purpose of post-eruptive tooth movement?
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What is mesial drift?
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What is the stage where the crown emerges into the oral cavity?
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What is the possible cause of tooth eruption?
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What compensates for interproximal wear?
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What is the phase of eruption that continues until the erupting teeth meet the opposing teeth?
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What type of cell is an odontoclast primarily derived from?
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Which of the following best describes the ruffled border of odontoclasts?
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Which dental hard tissue does an odontoclast primarily resorb?
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In retained deciduous teeth, which of the following teeth is most often retained?
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What primarily causes submerged deciduous teeth?
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How do odontoclasts differ from osteoclasts regarding size and nuclei count?
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Which enzyme exhibits high activity in odontoclasts during resorption?
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Which type of tooth is least frequently retained when there are no permanent successors?
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Study Notes
Eruption and Shedding of Teeth
- Eruption refers to the physiological process by which developing teeth emerge through the soft tissue of the jaws and the overlying mucosa to enter the oral cavity
- Humans have two sets of dentition: deciduous (primary) and permanent dentition
Stages of Tooth Movements
- Pre-eruptive stage (Follicular phase of eruption):
- Growing tooth moves in two directions to maintain its position in expanding jaws
- Bodily movement: bone resorption in direction of tooth movement and bone apposition
- Eccentric growth: growth in one part of tooth while rest remains constant
- Eruptive phase (Prefunctional eruptive phase):
- Tooth moves from its position within the bone of the jaw to its functional position in occlusion
- Principal direction of movement is occlusal or axial
- Movement of tooth takes place at a rate of 4mm in 14 weeks
- Post-eruptive tooth movement:
- Movements made by the tooth after it has reached its functional position in the occlusal plane
- Divided into three categories:
- Movements to accommodate growing jaws
- Movements to compensate for continued occlusal wear
- Movements to accommodate interproximal wear
Shedding of Deciduous Teeth
- Definition: Shedding or exfoliation of deciduous teeth is a physiological process for elimination of deciduous teeth by resorption of their roots prior to eruption of their permanent successors
- Pattern of shedding:
- Occurs as a result of progressive resorption of roots of the teeth and their supporting tissue, the periodontal ligament
- Pressure generated by the growing and erupting permanent tooth leads to shedding of deciduous tooth
- Factors that play an important role in shedding:
- Odontoclasts
- Pressure
Odontoclasts
- Derived from monocyte and migrate from pulpal B.V to resorption sites
- Multinucleated odontoclast with a clear ruffled (brush) border
- Found in lacunae
- Histologically, characteristic feature is a high level of activity of the enzyme acid phosphatase
- Most likely sequence of events in resorption of dental hard tissue by odontoclast:
- Initial removal of minerals
- Dissolution of organic matrix (mainly collagen) to smaller molecules
Clinical Considerations
- Retained Deciduous Teeth:
- May be retained for a long time beyond their usual shedding time
- Usually without permanent successors or their successors are impacted
- Most often the upper lateral incisor, less frequently the second permanent premolar, especially in the mandible
- Submerged Deciduous Teeth:
- Trauma may result in damage to either the dental follicle or the developing periodontal ligament
- If this happens, the eruption of the tooth ceases, and it becomes ankylosed to the bone of the jaw
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Description
This quiz covers the physiological process of tooth eruption, types of dentition, and characteristics of primary and permanent teeth. Learn about diphodont and mixed dentition with Dr. Abdel-latif Galal, lecturer of oral medicine and periodontology.
