Podcast
Questions and Answers
Which of these stages occurs for the primary dentition between the ninth and tenth week of prenatal development?
Which of these stages occurs for the primary dentition between the ninth and tenth week of prenatal development?
What is the term used to describe the process involving the proliferation of the dental lamina into buds or oval masses?
What is the term used to describe the process involving the proliferation of the dental lamina into buds or oval masses?
Proliferation
What develops into a tooth germ and its associated supporting tissue types?
What develops into a tooth germ and its associated supporting tissue types?
The ______ membrane remains between the bud and the growing ectomesenchyme.
The ______ membrane remains between the bud and the growing ectomesenchyme.
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The stellate reticulum is a cellular group located in the periphery of the developing tooth.
The stellate reticulum is a cellular group located in the periphery of the developing tooth.
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Match the developmental disturbances to the stage they occur in:
Match the developmental disturbances to the stage they occur in:
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What is the main process involved in the cap stage of tooth development?
What is the main process involved in the cap stage of tooth development?
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What structure develops during the cap stage with a specific form?
What structure develops during the cap stage with a specific form?
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Which part of the tooth germ produces the future dentin and pulp?
Which part of the tooth germ produces the future dentin and pulp?
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The dental sac is responsible for producing the enamel organ.
The dental sac is responsible for producing the enamel organ.
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The ______ stage assumes a bell shape due to unequal growth between the outer and inner enamel epithelium.
The ______ stage assumes a bell shape due to unequal growth between the outer and inner enamel epithelium.
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Which stage in tooth development involves the formation of the pre-ameloblasts?
Which stage in tooth development involves the formation of the pre-ameloblasts?
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What is the process called when odontoblasts secrete predentin?
What is the process called when odontoblasts secrete predentin?
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The dentin layer in a developing tooth is generally thinner than the corresponding layer of enamel matrix.
The dentin layer in a developing tooth is generally thinner than the corresponding layer of enamel matrix.
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The ______ is an extracellular substance that is partially calcified.
The ______ is an extracellular substance that is partially calcified.
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What happens to the basement membrane between the pre-ameloblasts and the odontoblasts during the formation of the dentinoenamel junction?
What happens to the basement membrane between the pre-ameloblasts and the odontoblasts during the formation of the dentinoenamel junction?
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What is the angled part of each ameloblast that faces the disintegrating basement membrane called?
What is the angled part of each ameloblast that faces the disintegrating basement membrane called?
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The process of eruption for both succedaneous and nonsuccedaneous teeth is the same.
The process of eruption for both succedaneous and nonsuccedaneous teeth is the same.
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The reduced enamel epithelium fuses with the ______ to allow for the eruption process.
The reduced enamel epithelium fuses with the ______ to allow for the eruption process.
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What type of cyst is formed from the REE after the crown is completely formed and matured?
What type of cyst is formed from the REE after the crown is completely formed and matured?
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What is the name for a developmental disturbance that results in either distorted root(s) or crown angulation?
What is the name for a developmental disturbance that results in either distorted root(s) or crown angulation?
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Enamel hypoplasia can be caused by a lack of vitamin D.
Enamel hypoplasia can be caused by a lack of vitamin D.
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The term ______ refers to the faulty development of dentin.
The term ______ refers to the faulty development of dentin.
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What happens to the cementum matrix after it is considered matured?
What happens to the cementum matrix after it is considered matured?
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What is the name for the condition when two or more tooth roots fuse together?
What is the name for the condition when two or more tooth roots fuse together?
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The presence of enamel pearls is a common occurrence during tooth development.
The presence of enamel pearls is a common occurrence during tooth development.
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The ______ is a bilayer rim that consists of the inner and outer enamel epithelia.
The ______ is a bilayer rim that consists of the inner and outer enamel epithelia.
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Which of these is NOT a component of the periodontium?
Which of these is NOT a component of the periodontium?
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What is the name given to abnormally formed enamel on the cemental root surface due to misplaced ameloblasts?
What is the name given to abnormally formed enamel on the cemental root surface due to misplaced ameloblasts?
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Multirooted teeth initially develop as single roots.
Multirooted teeth initially develop as single roots.
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The ______ of a tooth is the single root present at the base of the crown.
The ______ of a tooth is the single root present at the base of the crown.
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Which of these tissues is responsible for the resorption of the primary tooth roots during shedding?
Which of these tissues is responsible for the resorption of the primary tooth roots during shedding?
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What is the process called when the enamel organ is compressed, forming the reduced enamel epithelium?
What is the process called when the enamel organ is compressed, forming the reduced enamel epithelium?
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The permanent maxillary incisors erupt lingual to the primary incisors.
The permanent maxillary incisors erupt lingual to the primary incisors.
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The loss of a primary tooth is also known as ______.
The loss of a primary tooth is also known as ______.
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Study Notes
Tooth Development and Eruption: Part 1
- Tooth development, or odontogenesis, occurs in stages, stepwise, for both primary and permanent dentitions.
- Odontogenesis of the primary dentition begins between the sixth and seventh week of prenatal development.
- The initiation stage involves induction, an interaction between embryonic tissues.
- The initiation stage begins with ectoderm lining, the stomodeum.
- The bud stage is characterized by proliferation of the dental lamina into buds or oval masses that penetrate the ectomesenchyme.
- The cap stage involves proliferation, differentiation, and morphogenesis. Ectoderm forms enamel organ surrounding dental papilla.
- The bell stage is characterized by continuing proliferation, differentiation, and morphogenesis. Four different cell types are present.
- The OEE is a protective barrier to the rest of the enamel organ.
- The innermost tall columnar cells are IEE.
- The bell stage results in a bell-shaped enamel organ.
- In the cap stage, the underlying ectomesenchyme also undergoes proliferation. A basement membrane remains between the bud and the growing ectomesenchyme.
- Each dental bud from the dental lamina develops a tooth germ and supporting tissues.
- The cap shape of the enamel organ develops during this stage.
- A depression in the tooth bud forms the enamel organ.
- The future crown form of the tooth is signaled at this stage.
- The enamel organ produces enamel for the outer surface of the tooth.
- The initiation stage, the bud stage, the cap stage, and the bell stage relate to the development of the tooth.
Developmental Disturbances During Initiation Stage
- Lack of initiation within dental lamina results in anodontia.
- Partial anodontia (hypodontia) is more common and may occur with third molars, maxillary lateral incisors, and mandibular second premolars.
- Anodontia can be associated with ectodermal dysplasia.
- Ectodermal dysplasia can affect skin, hair, nails, teeth, or sweat glands, leading to partial or complete anodontia.
- Abnormal initiation can result in supernumerary teeth. These extra teeth have a hereditary etiology.
- Common locations for supernumerary teeth include between maxillary central incisors (mesiodens), distal to the maxillary third molars (distomolar), and in the premolar region of both arches.
Tooth Development and Eruption: Part 2
- The process of root development takes place after the crown is completely shaped and the tooth is starting to erupt into the oral cavity.
- The structure responsible for root development is the cervical loop, which is the most cervical part of the enamel organ.
- The cervical loop grows deeper into the ectomesenchyme and forms the Hertwig epithelial root sheath (HERS), which shapes the roots and creates dentin.
- The dental sac, of the ectomesenchyme, produces the periodontal ligament, cementum, and alveolar bone that support the tooth.
- Cementoblasts move to cover the root dentin area and undergo cementogenesis to lay down cementum matrix, or cementoid.
- Cementum calcification (maturation) forms mature cementocytes.
- The central cells of the dental papilla form pulp tissue.
- Excessive cementum formation can occur with concrescence. Concrescence is the union of root structures.
Stages of Tooth Development
- Initiation stage (weeks 6-7): Enamel organ forms.
- Bud stage (week 8): Dental lamina forms into buds that penetrate ectomesenchyme
- Cap stage (weeks 9-10): Enamel organ forms a cap shape.
- Bell stage (weeks 11-12): Enamel organ forms a bell shape. All four cell types are found.
Problems in Spacing
- A permanent tooth often erupts before the primary tooth is fully shed, creating spacing issues.
- Interceptive orthodontic therapy can prevent some of these situations.
- Prolonged retention of primary teeth requires early dental consultation.
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