Question

In ______ malocclusion, the mesiobuccal cusp of the maxillary permanent first molar occludes in the interdental space between the distal cusp of the mandibular first permanent molar and the mesial cusp of the mandibular second permanent molar.

1) Class I
2) Class II, Division 1
3) Class II, Division 2
4) Class III

Answer 1

In Class II, Division 2 malocclusion, the maxillary permanent first molar's mesiobuccal cusp sits in the space between the mandibular first and second permanent molars, indicating an overbite with specific teeth alignment traits.

Step-by-step explanation:

In Class II, Division 2 malocclusion, the mesiobuccal cusp of the maxillary permanent first molar occludes in the interdental space between the distal cusp of the mandibular first permanent molar and the mesial cusp of the mandibular second permanent molar. This means that the upper molar's cusp sits in the space right ahead of the lower second permanent molar and behind the lower first permanent molar, which is not ideal alignment for efficient chewing and can cause various dental issues.

Malocclusion is a misalignment issue that can lead to improper oral function and aesthetics. Specifically, Class II malocclusion is characterized by the upper teeth and jaw significantly overlapping the lower teeth and jaw, often referred to as an 'overbite.' Within Class II, Division 2 is a subset where the upper front teeth are tilted backward or are straight up while back teeth are normal or slightly protruded.