Which statement describes crossbite?

Which statement describes crossbite?

• A. Mandibular teeth lateral on one side and medial on the other
• B. Maxillary incisors ahead of mandibular incisors
• C. Both arches in perfect alignment
• D. There is no occlusal contact

Answer: (A)

Crossbite is a transverse misalignment where the upper and lower dental arches do not meet correctly from side to side, so the lower teeth end up biting inside the upper teeth on one side or on both sides. The statement about the mandibular teeth being lateral on one side and medial on the other directly describes this opposite-side mismatch in how the lower arch contacts the upper arch, which is the hallmark of a crossbite. The other descriptions don’t fit: maxillary incisors ahead of the mandibular incisors reflects a normal or excessive overjet, not a transverse misalignment; both arches in perfect alignment is ideal occlusion; and no occlusal contact points to an open bite scenario rather than a crossbite.

Crossbite is a transverse misalignment where the upper and lower dental arches do not meet correctly from side to side, so the lower teeth end up biting inside the upper teeth on one side or on both sides. The statement about the mandibular teeth being lateral on one side and medial on the other directly describes this opposite-side mismatch in how the lower arch contacts the upper arch, which is the hallmark of a crossbite. The other descriptions don’t fit: maxillary incisors ahead of the mandibular incisors reflects a normal or excessive overjet, not a transverse misalignment; both arches in perfect alignment is ideal occlusion; and no occlusal contact points to an open bite scenario rather than a crossbite.