Root formation & Clinical Considerations

1 / 10

The number of roots that are formed is determined by the:

Number of root sheaths developed by the enamel organ.

Number of root sheaths developed by the dental sac.

Number of medial ingrowths at the epithelial diaphragm.

Thickness of the cervical loop.

2 / 10

If Hertwig's epithelial root sheath does not disintegrate:

No cementum will be formed on the radicular dentin.

predentine will form on the outer surface of the radicular dentin.

It is likely that some of the enamel will be resorbed.

The apical end of the junctional epithelium will lie occlusal to the cemento-enamel junction.

3 / 10

The epithelial root sheath of Hertwig disintegrates:

After cementum formation.

Before odontoblastic differentiation.

After odontoblastic differentiation & before dentin matrix formation.

After odontoblastic differentiation & dentin matrix deposition.

4 / 10

The apposition stage of tooth development begins:

When the root of the tooth begins to develop.

When odontoblast start to differentiate.

When the first layer of enamel lay down.

When the first layer of dentine is deposited.

5 / 10

Concrescence is:

An extra root or accessory roots in a formed tooth.

Distorted root or roots in a formed tooth.

A union of root structure of two or more teeth through cementum only.

A spherical projection on the cemental root surface.

6 / 10

Epithelial rests of Malassez are:

All of them

Epithelial remnants of the epithelial root sheath of Hertwig only.

Epithelial strands and may undergo degeneration only.

Network or isolated islands in the P.L. only,

7 / 10

What statement about epithelial diaphragm is not true?

Its proliferation is accompanied by proliferation of pulp cells adjacent to diaphragm.

It produces narrowing of the wide cervical opening.

It's growing end is located coronal to the root sheath.

It grows in a horizontal plane.

8 / 10

Which of the following is not derived from the dental organ:

Ameloblasts.

Odontoblasts.

Stellate reticulum.

Hertwig's epithelial root sheath.

9 / 10

The epithelial rests in the periodontal ligament are derived from:

Epithelial root sheath of Hertwing's.

Dental sac.

Vestibular lamina.

Dental pulp.

10 / 10

Enamel pearls occur in:

Furcation area of premolars.

Cervical third of molars roots.

Apical third of molars roots.

Furcation area of molars.

Your score is