Questions and Answers
What is the term used for the presence of extra roots on a tooth?
Which tooth is commonly associated with accessory roots?
What happens to the enamel organ during active tooth eruption?
What occurs after enamel apposition halts at the crown?
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Which statement best describes the reduced enamel epithelium (REE)?
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During which process does the enamel organ undergo compression?
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What is the main role of ameloblasts once enamel apposition ceases?
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What is a significant outcome of developmental disturbances during root formation?
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What are tubercles in tooth development?
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During which stage do the inner enamel epithelium (IEE) cells differentiate into ameloblasts?
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What function does the outer enamel epithelium (OEE) perform during enamel production?
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What is the primary consequence of a disturbance during the cap stage of tooth development?
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What process involves the movement of the tooth through the surrounding tissues during the eruption phase?
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What is a potential result of developmental disturbances during dental eruption?
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What happens to the reduced enamel epithelium after the tooth erupts?
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Which age range is associated with the bell stage of primary dentition?
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What is the primary role of the outer cells of the dental papilla in root dentin formation?
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Which statement about HERS (Hertwig's epithelial root sheath) is correct concerning its role in dentin formation?
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What occurs after the disintegration of the root sheath in root dentin formation?
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What is the initial product secreted by odontoblasts after differentiation in the root area?
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Why is enamel absent in the roots of teeth?
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During root dentin formation, what remains between the inner enamel epithelium and odontoblasts?
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How does the process of dentinogenesis differ in the crown area compared to the root area?
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Which of the following processes occurs after root dentin formation is completed?
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Study Notes
Developmental Disturbances During Root Formation
- Teeth may have supernumerary roots, leading to extra or accessory roots.
- Common occurrences include mandibular canines and maxillary first premolars with accessory roots.
Active Eruption
- Active eruption begins after enamel apposition ceases in tooth crowns.
- Ameloblasts deposit an acellular dental cuticle on the enamel surface.
- The enamel organ layers compress to form reduced enamel epithelium (REE), consisting of flattened cells.
Developmental Disturbances During Cap Stage
- Teeth can develop tubercles or extra cusps, manifesting as small, round extensions of enamel.
Bell Stage
- Occurs around the 11th to 12th week of primary dentition development, characterized by a bell shape.
- Involves processes of proliferation, differentiation, and morphogenesis.
- Outer enamel epithelium (OEE) serves as a protective barrier, while inner enamel epithelium (IEE) differentiates into enamel-secreting ameloblasts.
Root Dentin Formation
- Induced differentiation of outer cells in the dental papilla leads to the formation of odontoblasts in the root area.
- The Hertwig's epithelial root sheath (HERS) induces odontoblast differentiation but does not form enamel; hence, roots lack enamel.
- After odontoblast differentiation, these cells secrete predentin.
- A basement membrane remains between the IEE and the odontoblasts during root formation.
- Following the completion of root dentin formation, the basement membrane and HERS disintegrate, leading to the formation of epithelial rests of Malassez (ERM).
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Description
Explore how developmental disturbances can affect root formation in teeth. This quiz covers topics such as supernumerary roots and their implications in dental health, based on the insights from Fehrenbach and Weiner's work in dental hygiene.