Dental Assistant Practice Exam

What does Class III in Angle's Classifications indicate?

1. Normal jaw relations

2. Retrognathic profile; overbite

3. Prognathic profile; underbite

4. Narrow cutting edge of anterior teeth

The correct answer is: Prognathic profile; underbite

Class III in Angle's Classification refers to a dental occlusion characterized by a prognathic profile, which means that the lower jaw (mandible) is positioned forward relative to the upper jaw (maxilla). This results in an underbite, where the lower teeth protrude beyond the upper teeth when the mouth is closed. This classification is significant in orthodontics and dentistry, as it helps practitioners determine the appropriate treatment plans for patients with varying types of malocclusion. Understanding the characteristics of Class III can assist in diagnosing issues related to jaw alignment and overall bite function. In a Class III relationship, there is often a notable aesthetic disparity and potential functional complications, leading to considerations for intervention such as braces or surgical options to achieve a more balanced bite and facial profile. The other choices focus on different aspects of jaw relationships and dental alignment. Recognizing the defining features of Class III assists dental professionals in addressing specific concerns related to jaw positioning and occlusion effectively.