The remnants of epithelial root sheath found in periodontal ligament

 # The remnants of epithelial root sheath found in periodontal ligament are called:

A. Enamel pearls

B. Enamel knots

C. Rests of Malassez

D. Epithelial diaphragm

The correct answer is C. Rests of Malassez.

The development of root does not begin till the enamel and dentin reach the future cemento-enamel junction. In development of root, enamel organ performs a very important function by forming Hertwig’s epithelial root sheath. Hertwig’s epithelial root sheath is molded and assumes tall shape of root by initiation of radicular dentin formation with the help of differentiation of radicular cells into the odontoblasts. Enamel on radicular portion is not formed because of the absence of stratum intermedium. The remnants of the epithelial root sheath are embedded in the periodontal ligament of erupted teeth and are called as epithelial rests of Malassez.

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Basement membrane that separates the enamel organ and the dental papilla

 # The basement membrane that separates the enamel organ and the dental papilla just prior to dentin formation is called the:

A. Advanced bell stage

B. Membrana preformativa

C. Cap stage

D. Enamel knot

The correct answer is B. Membrana preformativa. 

The basement membrane that separates the enamel organ and the dental papilla just prior to dentin formation is called the membrana preformativa.

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The successor of the deciduous teeth develops from:

 # The successor of the deciduous teeth develops from:

A. Lingual extension of the dental lamina

B. Labial extension of the dental lamina

C. Buccal extension of the dental lamina

D. Occlusal extension of the dental lamina

The correct answer is A. Lingual extension of the dental lamina

The initiation of the permanent first, second and third molars occurs at the fourth month of intrauterine life, one year after birth and five years after birth respectively. The lingual extension of dental lamina is called successional lamina. Successional lamina is responsible for the development of permanent incisors, canine and premolars. The successional lamina is active from the fifth month in utero (for the permanent central incisor) to ten months of age (second premolar).

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Final stage of tooth development

 # What is the final stage of tooth development?

a. Crown formation.

b. Root formation and eruption.

c. Function.

d. Dentinogenesis and amelogenesis.

The correct answer is C. Function.

Crown formation is followed by root formation and eruption. Root formation and eruption are followed by function. Function is the final stage of tooth development. Dentinogenesis and amelogenesis are followed by crown formation.

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