Orthodontics · single question
Which of the following defines a posterior crossbite?
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Correct answer: A. Buccal cusps of maxillary molars contact in the lingual embrasure of mandibular molars
In normal occlusion, the maxillary buccal cusps sit buccal to the mandibular buccal cusps. In posterior crossbite, the maxillary buccal cusps fall lingual to the mandibular buccal cusps. Early orthodontic correction is indicated to avoid functional shifts and asymmetric mandibular growth.11. Pediatric Dentistry & Trauma