Exam 20: Enamel, Dentin, and Pulp

The size of pulp horns and chambers do not vary significantly with age.

The bulk of the dentinal material is called primary dentin or regular dentin.An area of higher crystalline content immediately surrounding the dentinal tubules is called sclerotic dentin.

The multipointed cells that become dental papilla cells are called

Enamel is generally yellowish in color but usually appears white because of the reflection of the color of the underlying dentin.

Which of the following is NOT an abnormality in dentin?

The asymmetrical bulging end shape within the ameloblasts is called the

Enamel rod is somewhat parallel to the dentinoenamel junction (DEJ)because it runs all the way from the DEJ to the surface of the tooth.

Each of the following is true of enamel EXCEPT one.Which one is the EXCEPTION?

A sign that enamel production is completed is when

The dental papilla has genetic control over tooth shape.

Dentin matrix creates a barrier between the dental papilla and the preameloblasts.With the resulting fluid shift and change in polarity,the preameloblast becomes an ameloblast.

During the mineralization stage of enamel rod calcification approximately half of the hydroxyapatite crystals are deposited because the remaining half are deposited during the maturation stage.

Peripheral cells of the dental papilla are called ameloblasts.

The typical enamel rod is shaped wider at the top and narrower at the bottom because the hydroxyapatite crystals in those portions differ in size.

Following mild trauma,which type of dentin is formed?

For both primary and permanent teeth the process of tooth development is the same.Development occurs simultaneously in the anterior and posterior regions beginning at the cervical line and progresses toward the incisal/occlusal edges.

The reduced enamel epithelium secretes the primary enamel cuticle.

The portion of enamel rod that contains most of the fibrous organic substance is the

Each of the following is true of enamel lamellae EXCEPT one.Which one is the EXCEPTION?

Each of the following is true of the cells of the inner enamel epithelium (IEE)during the bell stage EXCEPT one.Which one is the EXCEPTION?