Enamel Organ

Enamel Organ

Question 1. Bell stage.
Answer:

During this stage, crown shape is determined layers seen during this stage are:

1. Outer enamel epithelium:

• Low cuboidal cell layer present at the periphery of the enamel organ.

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2. Inner enamel epithelium:

• Short columnar cell layer bordering the dental papilla.
• These epithelia meet at the rim of the enamel organ called the cervical loop.

3. Stellate reticulum:

• Consists of star-shaped cells with long anastomotic processes
• They collapse reducing the distance between the ameloblasts and the nutrient capillaries near the outer enamel epithelium.

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4. Stratum intermedium:

• It is present between the inner enamel epithelium and the stellar reticulum.
• Its cells are characterized by the high activity of the enzyme alkaline phosphate.

Question 2. Enamel organ.
Answer:

1. The enamel organ originates from the stratified epithelium of the native oral cavity.
2. It consists of

Epithelium layers:

1. Outer enamel epithelium
2. Stellate reticulum
3. Stratum intermedium
4. Inner enamel epithelium

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Dentinoenamel junction:

1. It is borderline between the inner enamel epithelium and the connective tissue of the dental papilla.

Cervical loop:

It is the region where the inner enamel epithelium reflects onto the outer enamel epithelium at the border of the wide basal opening of the enamel organ.