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Structural Characteristics of Retzius Incremental Lines in Enamel

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Structural Characteristics of Retzius Incremental Lines in Enamel

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Questions and Answers

What do the lines of Retzius in enamel represent?

Blood vessels

Incremental growth lines (correct)

Nerve endings

Inflammatory cells

In what direction do the lines of Retzius run in the enamel?

Vertical, from the enamel to the dentin

Horizontal, parallel to the occlusal surface

Oblique, toward the occlusal surface (correct)

Curved, following the curvature of the tooth

Which part of the tooth has gnarled enamel for resistance against masticatory forces?

Gingival margin

Cervical area

Cusp and incisal edges (correct)

Interdental papilla

What is the purpose of enamel being thickest over areas of greatest impact?

To resist masticatory forces (A) Signup and view all the answers

Which structure appears as concentric rings in a cross-section similar to annual rings of a tree?

Lines of Retzius (C) Signup and view all the answers

What is the role of the perikymata in the enamel structure?

Indicate where enamel formed before birth is present (B) Signup and view all the answers

What is the function of the bands of Hunter-Schreger in enamel?

Reflect the wave-shaped course of enamel rods in three-dimensional space (B) Signup and view all the answers

What distinguishes Type C lamellae from Type A and B lamellae?

They form during tooth function (C) Signup and view all the answers

Where are enamel tufts typically distributed?

Around the dentino-enamel junction (D) Signup and view all the answers

What causes the dark appearance of enamel spindles?

Presence of air and debris resulting from preparation of sections (A) Signup and view all the answers

Why do cracks occur in enamel?

As a result of stress from breathing cold air or drinking beverages (A) Signup and view all the answers

What is the significance of the neonatal line in dental anatomy?

Reflects marked physiological changes occurring at birth (C) Signup and view all the answers