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Questions and Answers
What is the term used to describe the natural teeth in the jaws?
What is the term used to describe the natural teeth in the jaws?
Dentition
The permanent dentition replaces the primary dentition.
The permanent dentition replaces the primary dentition.
True
What is the process called by which developing teeth emerge through the soft tissue of the jaws and the overlying mucosa?
What is the process called by which developing teeth emerge through the soft tissue of the jaws and the overlying mucosa?
Tooth eruption
Which of the following are phases of tooth eruption?
Which of the following are phases of tooth eruption?
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What is the name of the structure that differentiates from primitive oral epithelium and forms enamel and the DEJ?
What is the name of the structure that differentiates from primitive oral epithelium and forms enamel and the DEJ?
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What is the name of the structure that is made up of fiber cells and differentiates into PDL, cementum, and alveolar bone?
What is the name of the structure that is made up of fiber cells and differentiates into PDL, cementum, and alveolar bone?
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What term describes the fibers that attach to the cementum and alveolar bone in the PDL?
What term describes the fibers that attach to the cementum and alveolar bone in the PDL?
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The PDL fibers initially lack orientation and quickly align themselves obliquely.
The PDL fibers initially lack orientation and quickly align themselves obliquely.
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What is the name of the layer of cells that forms after enamel development and helps facilitate tooth eruption?
What is the name of the layer of cells that forms after enamel development and helps facilitate tooth eruption?
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What is the term used to describe the movement of tooth after its appearance in the oral cavity until it reaches the functional position?
What is the term used to describe the movement of tooth after its appearance in the oral cavity until it reaches the functional position?
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The initiation of root formation starts the eruptive (pre-functional) phase of tooth eruption.
The initiation of root formation starts the eruptive (pre-functional) phase of tooth eruption.
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What is the name of the cells that form root dentin and pulp tissues?
What is the name of the cells that form root dentin and pulp tissues?
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Bone removal is necessary for permanent teeth to erupt.
Bone removal is necessary for permanent teeth to erupt.
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Active eruption takes place after teeth are functioning to maintain the erupted tooth's position in occlusion.
Active eruption takes place after teeth are functioning to maintain the erupted tooth's position in occlusion.
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The formation of the REE is essential for a primary tooth to erupt into the oral cavity.
The formation of the REE is essential for a primary tooth to erupt into the oral cavity.
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The REE first fuses with the oral epithelium lining the oral cavity.
The REE first fuses with the oral epithelium lining the oral cavity.
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Enzymes from the REE disintegrate the central part of the fused tissue to create an epithelial tunnel for the erupting tooth.
Enzymes from the REE disintegrate the central part of the fused tissue to create an epithelial tunnel for the erupting tooth.
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The coronal part of the fused epithelial tissue peels back off the crown during active eruption of a primary tooth.
The coronal part of the fused epithelial tissue peels back off the crown during active eruption of a primary tooth.
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The process of shedding a primary tooth is intermittent due to the simultaneous differentiation of osteoblasts, odontoblasts and cementoblasts.
The process of shedding a primary tooth is intermittent due to the simultaneous differentiation of osteoblasts, odontoblasts and cementoblasts.
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The primary tooth is exfoliated or shed as the permanent tooth develops lingual to it.
The primary tooth is exfoliated or shed as the permanent tooth develops lingual to it.
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What is the name of the movement that occurs after the tooth has attained its functional position?
What is the name of the movement that occurs after the tooth has attained its functional position?
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What type of movement occurs between 14 and 18 years to keep developing with the increasing height of the jaws?
What type of movement occurs between 14 and 18 years to keep developing with the increasing height of the jaws?
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What type of post-eruptive movement is primarily compensated by the continuous deposition of cementum around the tooth's apex?
What type of post-eruptive movement is primarily compensated by the continuous deposition of cementum around the tooth's apex?
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What type of movement involves a mesial or approximal drift to compensate for interproximal wear?
What type of movement involves a mesial or approximal drift to compensate for interproximal wear?
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What are the four factors that influence the mechanism of tooth movement?
What are the four factors that influence the mechanism of tooth movement?
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Osteoclasts and osteoblasts play a crucial role in reshaping the alveolar bone to accommodate tooth movement during bone remodeling.
Osteoclasts and osteoblasts play a crucial role in reshaping the alveolar bone to accommodate tooth movement during bone remodeling.
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Root formation occurs after crown formation, providing an anchor within the jawbone.
Root formation occurs after crown formation, providing an anchor within the jawbone.
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Vascular pressure refers to the circulation of blood in the tissues surrounding teeth, aiding in nutrient and oxygen delivery as well as waste removal.
Vascular pressure refers to the circulation of blood in the tissues surrounding teeth, aiding in nutrient and oxygen delivery as well as waste removal.
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The periodontal ligament (PDL) is a connective tissue that anchors teeth to the alveolar bone and remodels to adapt to applied forces during tooth movement.
The periodontal ligament (PDL) is a connective tissue that anchors teeth to the alveolar bone and remodels to adapt to applied forces during tooth movement.
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Study Notes
Course Information
- Course title: Embryology & Histology
- Course code: HSDH2140
- Semester: Fall 2024
- Instructor: Dr. Jafar Alabdullah
- University: University of Doha for Science & Technology
Tooth Development
- Odontogenesis: The continuous process of tooth development, occurring in stages.
- Dentition: The natural teeth in the jaws.
- Primary dentition (baby teeth): 2 to 6 years, 20 teeth
- Permanent dentition (adult teeth): >12 years, 32 teeth; gradually replacing primary dentition
Learning Objectives
- Describe the relationship between bone, tooth root development, and the mechanisms of tooth eruption and post-eruption.
- Pre-active
- Eruptive
- Post-eruptive
- Describe abnormalities in eruption, exfoliation, occlusions, and their etiologies.
Tooth Eruption
- Eruption: The process of teeth cutting through the gums (oral mucosa).
- Tooth eruption emerges through the soft tissue and enters the oral cavity
- Contacts teeth of opposing arch and functions in mastication
Phases of Tooth Eruption
- Pre-eruptive phase:
- Starts with tooth development and ends when the crown is fully formed.
- Includes all primary and permanent tooth crown movements during initiation and formation.
- This phase includes formation of the enamel organ, dental papilla, dental sac, and alveolar bone as well as the movement of the tooth within the growing jaw
- Eruptive phase:
- Tooth movement from its position within the jawbone to its functional position in occlusion.
- Continued jaw growth occurs during eruptive movement
- Pre-functional eruptive movement occurs after tooth appearance in the oral cavity till it reaches the functional position
- Post-eruptive phase:
- Tooth movements after reaching the functional position in the occlusal plane.
- Three categories: accommodation for growth, compensation for occlusal wear, and accommodation for interproximal wear.
Periodontal Ligament (PDL) Development
- The dental sac forms the PDL on the outside of the newly formed cementum.
- Collagen fibers organize into bundles attaching to cementum and alveolar bone (Sharpey's fibers).
Pre-eruptive Phase Characteristics
- Differentiated enamel organ from primitive oral epithelium forming enamel and DEJ
- Dental papilla is comprised of odontoblasts and forms dentin and dental pulp
- Dental sac or follicle forms fiber cells differentiating into PDL, cementum, and alveolar bone
- Formation of bone cavity surrounding the apex of the tooth
- Movement of the developing tooth within the jaw
Eruptive (Pre-functional) Phase
- Four major events:
- Root formation: requires space for elongation of the root, including proliferation of epithelial root tissues and differentiation of odontoblasts, while dental papilla forms root dentin and pulp tissue; and cementum, PDL, and bone are formed
- Bone remodeling facilitates the process of tooth eruption
- Vascular pressure supports nourishment and oxygen flow for cell function and waste removal
- Periodontal ligament supports connections between teeth and alveolar bone; remodels according to applied forces
- Bone removal is necessary for permanent teeth to erupt
Reduced Enamel Epithelium (REE)
- Forms after enamel development.
- Fuses with oral epithelium for tooth eruption through the gums
- Protects the enamel from damage until after eruption
Active Eruption
- Occurs after teeth are fully functional to maintain position in occlusion, while jaws continue growth.
- The actual vertical movement of the tooth, including fusing of the reduced enamel epithelium with the oral epithelium followed by the production of enzymes disintegrating the central part of the fused tissue to create an epithelial tunnel for the tooth to erupt through the surrounding oral epithelium into the oral cavity.
- The coronal part of the fused epithelial tissue peels off the crown, leaving the cervical part attached to the neck of the tooth.
- The process of shedding primary teeth is intermittent, as osteoblasts differentiate to replace resorbed bone, while odontoblasts and cementoblasts replace resorbed root parts.
Post-eruptive Tooth Movement
- Three categories: accommodation for growth, compensation for occlusal wear, and accommodation for interproximal wear.
Mechanism of Tooth Movement
- Bone remodeling (osteoclasts and osteoblasts) is crucial in reshaping the alveolar bone.
- Root formation expands the roots, providing anchors within the jawbone.
- Vascular pressure (blood circulation) delivers nutrients and oxygen, removing waste products.
- Periodontal ligament (PDL) connects teeth to alveolar bone and adapts to applied forces.
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Description
This quiz covers the stages of odontogenesis and the details of primary and permanent dentition. Students will explore the relationship between bone and tooth root development, as well as mechanisms of tooth eruption and potential abnormalities. Test your knowledge on the intricacies of tooth development and eruption processes.
