30 Questions
What is the approximate time it takes to complete the crown of a permanent tooth?
5 years
What is the role of ameloblasts in amelogenesis?
To produce a special protein scaffold
What happens during the maturation stage of amelogenesis?
Ameloblasts remove water, proteins, and other organic materials
What is the main component that grows in the protein scaffold during amelogenesis?
Hydroxyapatite crystals
What is the function of the Tomes' processes in enamel formation?
To shape the enamel rod
What is the percentage of time taken up by the maturation stage in the process of producing a full crown of enamel?
Up to two thirds
At which stage of tooth development does the enamel organ form?
Bud stage
What is the primary function of the cells in the inner enamel epithelium during the morphogenetic phase?
To shape the future crown
During which phase do the inner enamel epithelium cells differentiate into ameloblasts?
Histodifferentiation phase
At approximately which week of embryonic development does the bell stage occur?
11th week
What is the term for the process of enamel development?
Amelogenesis
What is the function of the stellate reticulum during tooth development?
To regulate the movement of cells and ions
What is the main function of Tomes' process in amelogenesis?
To stagger protein secretion into two parts, forming prisms and interprismatic regions
What is the result of the stellate reticulum collapsing during the secretory phase?
The surrounding vascular tissue moves closer to the ameloblasts
What is the percentage of final enamel hardness achieved during the secretory phase?
30%
What do ameloblasts secrete during the secretory phase?
Enamel matrix proteins
What is the main component of enamel matrix proteins?
Amelogenin
What is the function of the stratum intermedium during the secretory phase?
To support the ameloblasts
What happens to the reduced enamel epithelium as a tooth erupts?
It merges with the oral epithelium
What is the function of the junctional epithelium?
To act as a seal from the oral environment
What remains of the reduced enamel epithelium after a tooth erupts?
Only the cervical portions remain
What do ameloblasts secrete during the late maturation stage of amelogenesis?
Enamel matrix protein-digesting enzymes
What happens to most of the reduced enamel epithelium during tooth eruption?
It gets destroyed
What is the effect of ameloblasts removing water from the developing enamel during the late maturation stage?
Increasing the mineral content of the maturing tissue
What is the fate of the cervical portions of the reduced enamel epithelium?
They become the junctional epithelium
At which stage of amelogenesis is enamel most susceptible to fluoride and tetracycline?
Late maturation stage
What is the function of the reduced enamel epithelium?
To protect and cover the outer surface of the enamel until tooth eruption occurs
What is the relationship between the reduced enamel epithelium and the oral epithelium during tooth eruption?
They merge together
What is the characteristic of ameloblasts during the late maturation stage of amelogenesis?
They cycle between the early and late maturation stages repeatedly
What occurs after the completion and full maturation of the enamel?
The enamel organ collapses into a dense covering of epithelium
Test your knowledge of enamel development and amelogenesis, including the lifecycle of ameloblasts, Tomes' processes, and the enamel matrix. Learn about the different stages of tooth crown formation and the development of dental tissues.
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