38 Questions
What are the two subdivisions that arise from the primary epithelial band?
Dental lamina and vestibular lamina
Where do the epithelial thickenings or placodes form within the primary epithelial band?
In the alveolar process
What is the term used to describe the morphology of the developing tooth during the three stages of tooth development?
Bud, cap, and bell
During which stage of tooth development is a tooth bud characterized?
Bud stage
What is the term used to describe the increase in cellular density next to the epithelial outgrowth?
Condensation
What is the role of the dental lamina in tooth formation?
It is involved in the initiation of tooth development
How many local thickenings or placodes form on the dental lamina in each alveolar process?
10
What is the shape of the cells in the concavity of the cap during the cap stage?
Columnar
What forms around the epithelial thickenings or placodes during tooth development?
Ectomesenchymal cells
What forms from the interaction of the enamel organ and dental papilla?
Tooth germ
During the bud stage, what happens to the epithelial cells?
They proliferate into the ectomesenchyme
What is the name of the stage where the enamel organ looks like a cap?
Cap stage
What is the term used to describe the cells in the convex portion of the cap?
Outer enamel epithelium
What is the name of the structure that forms from the interaction of the epithelial bud and ectomesenchyme?
Enamel organ
What is the function of the fluid in the stellate reticulum?
To act as a shock absorber and protect the enamel forming cells
What is the term given to the cells in the center of the enamel organ that synthesize glycosaminoglycans?
Stellate reticulum
What is the shape of the enamel organ in the bell stage?
Bell-like
What is the function of the primary enamel knot?
To initiate the formation of the enamel
What is the term given to the structure formed by the cells in the centre of the concavity of the ‘cap’?
Primary enamel knot
What is the characteristic of the dental papilla in the cap stage?
It is more crowded and more vascular
What is the significance of the bell stage?
It marks the end of morphodifferentiation
Where does the formation of the organic matrix of dentin begin?
In the region of the future cusp
What is the direction of the mineralization of the dentin matrix?
From the dentinoenamel junction towards the pulpal and apical direction
What happens to the inner enamel epithelial cells after the first layer of dentin is formed?
They elongate and exhibit reversal of polarity
What is the direction of the enamel formation from the dentinoenamel junction?
Towards the outer surface
What type of cells produce the organic matrix of enamel?
Ameloblasts
What is the term for the line separating the newly differentiated odontoblasts and the inner enamel epithelium?
Membrana preformativa
What is the sequence of events in the formation of the dentinoenamel junction?
Odontoblasts differentiate, then dentin forms, then enamel matrix forms
What is the result of the differentiation of odontoblasts and ameloblasts?
Formation of enamel and dentin
What influences the differentiation of odontoblasts?
Inner enamel epithelial cells
What is the outcome of the process of reciprocal induction?
Differentiation of odontoblasts and ameloblasts
What is the significance of Hertwig’s epithelial root sheath formation?
It determines the shape, length, size, and number of roots
What is the composition of Hertwig’s epithelial root sheath?
Inner and outer enamel epithelial cells
What is the role of the inner enamel epithelial layer of the sheath?
It influences the formation of a layer of odontoblasts
What occurs after the first layer of radicular dentin is formed?
The dental follicle cells invade the double layer of sheath
What is the significance of the cervical portion of the enamel organ?
It initiates radicular dentin formation
What is the relationship between the differentiation of ameloblasts and odontoblasts?
They are interdependent
What marks the beginning of root development?
When the dentinoenamel line reaches the future cementoenamel junction
Test your knowledge on the role of dental lamina in tooth formation, various stages of tooth development, and changes in the process of calcification and tooth form. Learn about the formation of teeth from ectoderm and ectomesenchyme. Evaluate your understanding of the development of teeth from 37 days onwards.
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