The widely accepted mechanism accounting for tooth eruption is____________?
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Answer: C. Periodontal ligament traction theory
Explanation
The periodontal ligament traction theory explains active tooth eruption through fibroblast motility and collagen remodeling. Fibroblasts within the ligament exert contractile forces that actively pull the developing tooth toward the oral cavity. Continuous turnover of the extracellular matrix provides the necessary biomechanical drive for upward movement. Tooth eruption is a complex multi-factorial process involving root elongation, bone remodeling, and ligament traction. The periodontal ligament is a specialized fibrous connective tissue connecting the tooth root to alveolar bone. Fibroblasts are highly active cells capable of generating mechanical tension through intracellular actin filaments.
Understanding eruption mechanisms helps orthodontists predict and manage impacted or delayed teeth in patients. Failure of normal eruption pathways can lead to clinical impaction requiring surgical and orthodontic intervention. Periodontal ligament remodeling is essential for maintaining tooth position under continuous functional chewing forces. The hydrodynamic theory relates primarily to fluid movement within dentinal tubules causing tooth sensitivity. The clone theory is a developmental concept not directly responsible for the mechanical eruption of teeth. The vascular theory, proposing blood pressure drives eruption, is no longer considered the primary mechanism.
Related questions
Q1. What is the most widely accepted theory explaining dentin sensitivity, or how dental sensations are transmitted_____________?
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Answer: C. Hydrodynamic theory
The hydrodynamic theory states that fluid movement within dentinal tubules stimulates nerve endings, causing sensitivity. Stimuli such as cold, heat, or touch cause rapid displacement of fluid inside patent microscopic d...
Q2. Intimal B cells within the synovial membrane of the temporomandibular joint are classified as_______________?
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Answer: A. Fibroblast like
Type B intimal synoviocytes within the synovial membrane are specialized fibroblast-like cells. They actively synthesize and secrete hyaluronan and extracellular matrix proteins into synovial fluid. These cells maintain...
Q3. Myoepithelial cells likely perform which function______________?
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Answer: D. All of the above
Myoepithelial cells perform multiple essential roles within salivary gland acini. They contract actively to help expel saliva from secretory end pieces. They provide structural support and help maintain secretory unit in...
Q4. A keyhole-shaped cross-sectional appearance is characteristic of______________?
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Answer: B. Prismatic enamel
Prismatic enamel is characterized by well-defined crystalline rods, many of which display a classic keyhole cross-sectional shape. This repeating structural unit consists of a wider head region and a narrower tail region...
Q5. Development of the future temporomandibular joint components initiates at_____________?
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Answer: B. 10 weeks
Development of the future temporomandibular joint components initiates around the tenth embryonic week. Mesodermal condensations appear within the blastema to form the articular disc and condyle. Cavitation occurs later...
Q6. The principal bulk of dentin is generated by______________?
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Answer: C. Inter tubular dentin
Intertubular dentin forms the principal bulk of the dentin matrix structure. It is located directly between the fluid-filled dentinal tubules throughout the crown. This matrix provides the primary structural foundation f...