2. Oral Histo Mosabqa – Dr. Fathy Emad

Tooth Development

The number of attempts remaining is 1

1 / 15

The epithelial component of the tooth germ is known as:

Enamel organ

Dental papilla

Dental lamina

Dental sac

2 / 15

Hyperdontia results from:

Failure of ERSH

Overactivity of dental lamina

Reduced enamel epithelium

Enamel pearl formation

3 / 15

The cell-free zone is seen between:

Enamel organ and dental lamina

Enamel organ and dental follicle

Inner enamel epithelium and dental papilla

Dentin and enamel

4 / 15

Accessory root canals are caused by:

Fusion of ERSH extensions

Hyperactivity of dental lamina

Pressure on ameloblasts

Early degeneration of ERSH

5 / 15

During morphodifferentiation, cessation of mitotic activity in the inner enamel epithelium determines:

The pattern of enamel rods

The onset of dentin mineralization

The number of roots

The shape of the tooth crown

6 / 15

Which stage shows the first deposition of dentine?

Apposition stage

Cap stage

Early bell stage

Late bell stage

7 / 15

The reduced enamel epithelium forms after:

Root formation

Dentinogenesis

Enamel completion

Eruption

8 / 15

The epithelial rests of Serres are remnants of:

Hertwig’s root sheath

Enamel organ

Dental papilla

Dental lamina

9 / 15

The enamel organ is mainly responsible for:

Dentin formation

Pulp formation

Enamel formation

Cementum formation

10 / 15

Which of the following best explains the formation of enamel pearls?

Differentiation of odontoblasts from dental sac cells

Late disintegration of Hertwig’s epithelial root sheath

Early degeneration of epithelial root sheath

Persistence of stratum intermedium during root formation

11 / 15

Which structure induces odontoblast differentiation?

Outer enamel epithelium

Dental sac

Inner enamel epithelium

Stellate reticulum

12 / 15

The enamel knot appears during which stage?

Late bell stage

Bud stage

Early bell stage

Cap stage

13 / 15

The lateral dental lamina gives rise to:

Vestibular lamina

Permanent molars

Permanent successors

Deciduous teeth

14 / 15

The function of stratum intermedium is:

Supplies alkaline phosphatase

Forms dentin

Acts as cushion

Initiates enamel knot

15 / 15

The Hertwig’s epithelial root sheath is derived from:

Stratum intermedium

Inner and outer enamel epithelium

Enamel cord

Inner enamel epithelium only

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