Orthodontic Assistant Practice Exam

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What is measured by the term overjet?

The vertical distance between teeth
The horizontal distance between maxillary and mandibular teeth
The depth of the bite
The angle of the jaw

The correct answer is: The horizontal distance between maxillary and mandibular teeth

Overjet refers specifically to the horizontal distance between the maxillary (upper) and mandibular (lower) incisors when the teeth are in occlusion. It is a critical measurement in orthodontics that helps in assessing the relationship of the upper and lower dental arches. A normal overjet usually ranges from 1 to 3 millimeters, while deviations from this range can indicate various dental alignment issues, such as overbite or underbite relationships. Understanding overjet is essential for orthodontic diagnosis and treatment planning. For instance, if there is an excessive overjet, it may indicate that the upper teeth are protruded or the lower teeth are retruded, which can have implications for both function and aesthetics. Thus, recognizing the significance of overjet helps orthodontic professionals establish a comprehensive treatment plan aimed at correcting malocclusions and improving overall oral health.