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Restorative & Materials · single question

The 'law of concentricity' in restorative dentistry refers to which concept?

  1. External tooth shape mirrors internal enamel thickness at all levels
  2. The center of the pulp chamber coincides with the center of the tooth at the CEJ level
  3. The outer contour of the crown reflects the inner pulp morphology
  4. The maximum bulge (height of contour) of the tooth corresponds to the CEJ
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Correct answer: C. The outer contour of the crown reflects the inner pulp morphology

  • A. Enamel thickness variations do not define concentricity.
  • B. The center of the pulp corresponds to the center of the crown — this is a description of the concept but not the specific anatomical principle tested.
  • C. Correct. The law of concentricity states that the outer contour of the crown reflects (is concentric to) the internal pulp morphology. The outer surface shape mirrors the pulp chamber and canal shapes — useful in restorative and endodontic access preparation.
  • D. The maximum bulge occurring at the CEJ is a different concept (height of contour).

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