National Dental Examining Board of Canada (NDEB) Practice Exam

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What occlusal parameter is used to differentiate between an overbite of dental or skeletal origin?

  1. Occlusal plane angle

  2. Mandibular curve of Spee

  3. Maxillary arch form

  4. Mandibular arch length

The correct answer is: Mandibular curve of Spee

The curve of Spee is the occlusal parameter that is used to differentiate between an overbite of dental or skeletal origin. The occlusal plane angle, maxillary arch form, and mandibular arch length can all be useful in analyzing occlusal relationships, but they do not specifically address the overbite. The mandibular curve of Spee, on the other hand, refers to the natural curve of the mandibular arch from anterior to posterior and can provide important information about the relationship between the upper and lower jaws. If the overbite is a result of dental factors, the curve of Spee may appear flatter or more exaggerated. However, if the overbite is due to skeletal factors, the curve of Spee will remain relatively consistent. This makes the curve of Spee a key parameter in differentiating between an overbite of dental or skeletal origin.

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