HOSA Dental Terminology Practice

What describes a Class III occlusal relationship?

1. Mandibular molar is at its normal position

2. Mandibular molar is posterior to normal position

3. Mandibular molar is anterior to normal position

4. Both molars are misaligned

The correct answer is: Mandibular molar is anterior to normal position

A Class III occlusal relationship, often referred to as a "prognathic" relationship, is characterized by the positioning of the mandibular molars being anterior (or forward) relative to their normal position when compared to the maxillary molars. This means that in a Class III relationship, the lower jaw is positioned further forward than it should be in relation to the upper jaw. This can be due to various factors, including genetic disposition, dental or skeletal issues. In contrast, the other choices do not accurately describe the Class III relationship. The normal position of the mandibular molar (identified in the first choice) pertains to a Class I relationship, while a position more posterior to the normal (as described in the second choice) indicates a Class II relationship. Lastly, the option regarding both molars being misaligned does not specifically articulate the defining forward positioning aspect of a Class III relationship. Thus, the defining feature of a Class III occlusal relationship is the anterior positioning of the mandibular molar.