Enamel Development Incremental Lines Quiz

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What is the term for the fine grooves running circumferentially around the crown of the tooth's surface enamel?

Perikymata grooves (correct)

Focal holes

Enamel caps

Neonatal line

Which area of the enamel is characterized by small elevations resulting from enamel deposition on top of debris late during tooth development?

Enamel spindles

Enamel tufts

Enamel lamellae

Enamel caps (correct)

What causes a particularly marked stria in the enamel that reflects the metabolic changes at birth?

Incremental lines

Neonatal line (correct)

Enamel spindles

Enamel tufts

Which feature on the enamel surface marks the ends of ameloblasts and is approximately 1-1.5µm in depth?

Enamel caps Signup and view all the answers

What is the term for depressions on the surface of enamel resulting from the loss of enamel caps with underlying material?

Focal holes Signup and view all the answers

Which part of the enamel is richer in trace elements, especially fluorine, and has less carbonate content?

Surface Enamel Signup and view all the answers

What is the approximate distance between enamel striae in the middle portion?

25-35μm Signup and view all the answers

What is the approximate distance between cross striations near the enamel-dentine junction?

2μm Signup and view all the answers

What do incremental lines represent in enamel formation?

Periods of inactivity alternating with periods of activity Signup and view all the answers

What is the direction of enamel striae in cross sections?

Circumferentially Signup and view all the answers

What is the possible cause of differential light-scattering effects at the enamel striae?

Slight change in prism direction/thickness, or slight differences in crystallite composition/orientation, and/or differences in organic content Signup and view all the answers

What do cross striations reflect in enamel formation?

Daily rhythm Signup and view all the answers

What is the unique feature of the Enamel-Dentine Junction that retards crack propagation?

It has a scalloped pattern beneath cusps and incisal edges Signup and view all the answers

What is the function of Enamel Tufts in the inner third of the enamel?

They are thought to be residual matrix protein at the prism boundaries Signup and view all the answers

What are Enamel Lamellae and what is their characteristic feature?

They are hypomineralised areas that run the entire enamel thickness Signup and view all the answers

What is the direction of Enamel Spindles in relation to the prisms?

They are not aligned with the prisms Signup and view all the answers

What are Incremental Lines, Cross and Stria in the context of enamel?

They are features of the Enamel that occur from DEJ to surface Signup and view all the answers

What is the mineral content of the Enamel-Dentine Junction compared to Enamel and Dentine?

It is less mineralised than both Enamel and Dentine Signup and view all the answers