Development And Growth Of Teeth Question And Answers

Development And Growth Of teeth

Question 1. Describe the detail about stages of tooth development.
Answer:

Stages of tooth development:

• The development of a tooth is divided into several stages that are named after the shape of the enamel organ.

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1. Bud stage:

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• The epithelium of the dental laminae is separated from the underlying ectomesenchyme by a basement membrane.
• Round or avoid swellings develop from the basement membrane of 10 different points corresponding to tire 10 deciduous teeth.
• These are the primordial of the enamel organs, the tooth buds.
• In the bud stage, the enamel organ consists of peripherally located low columnar cells and centrally located polygonal cells.
• The supporting ectomesenchymal cells are packed closely beneath and around the epithelial bud.
• These cells undergo mitosis.
• As a result of it and the migration of the neural crest cells into it condensation of the tooth bud occurs.
• Condensation is immediately subjacent to the enamel organ in dental papillae.
• It forms tooth pulp and dentin.
• Similarly, ectomesenchymal condensation around tooth buds and dental papillae called dental sacs forms cementum arid periodontal ligament.

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2. Bud to cap transition:

• The transition from bud to cap marks the onset of morphologic differences between tooth germs that give rise to different types of teeth.

3. Cap stage:

• As the tooth bud continues to proliferate, due to unequal growth in different parts of the tooth bud, it leads to the cap stage.
• The peripheral cells covering the convexity of the cap are cuboidal called the outer enamel epithelium.
• The cells in the convexity of the cap called the inner enamel epithelium are tall, and columnar.
• Between these two layers are star-shaped cells called stellate reticulum.
• The outer enamel epithelium is separated from the dental sac and the inner enamel epithelium from the dental papilla by a basement membrane.
• The inner enamel epithelium meets the outer enamel epithelium at the rim of the enamel organ called the cervical loop.

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4. Bell stage:

• The continued growth of tire tooth germ leads to the bell stage as the tire enamel organ resembles a bell as the undersurface of the epithelial cap deepens.
• During the tills stage, the tooth crown assumes its final shape.
• Four different types of epithelial cells can be identified.
  1. Inner enamel epithelium:
     • Consists of a single layer of cells of 4 – 5 pm in diameter and about 40 um high.
     • These cells differentiate into ameloblast.
  2. Stratum intermedium
     1. It is essential for enamel formation.
     2. Cells in this layer are closely attached by desmosomes.
  3. Stellate reticulum
     • It consists of star-shaped cells which help for attachment between the cells.
     • It collapses to reduce the distance between the centrally situated ameloblasts and the nutrient capillaries near the outer enamel epithelium.
  4. Outer enamel epithelium
     • The cells of this layer are cuboidal.
     • Its smooth surface is laid down in folds between which capillary loops provide a rich nutritional supply for intense metabolic activity.
     • Before the inner enamel epithelium begins to produce enamel, the peripheral cells of dental papilla differentiate into odontoblasts forming dentin.
     • Remnants of dental lamina
     • Outer enamel epithelium
     • Ameloblasts
     • Stellate reticulum Dental follicle Stratum intermedium Odontoblasts
     • Collasped stellate reticulum Ameloblasts

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5. Advanced bell stage:

• It is characterized by mineralization and root formation.
• The boundary between inner enamel epithelium and odontoblasts outlines the dentin enamel junction (DEJ).
• the dentin formation begins at this point and then proceeds pulpal and apically.
• Over it, ameloblast by down enamel which then proceeds coronally and cervically.
• In the cervical portion, the enamel organ gives rise to the epithelial root sheath of Hertwig.

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Question 2. Enumerate stages of tooth development. Describe the bell stage in detail.
Answer:

Stages of tooth development:

• Bud stage
• Cap stages
• Bell stage
• Advanced bell stage.