Final answer:
An overbite is an excessive vertical overlap of maxillary and mandibular anterior teeth.
Step-by-step explanation:
An overbite is defined as an excessive vertical overlap of maxillary and mandibular anterior teeth.
The maxillary bone forms the upper jaw and contains the upper teeth, while the mandible forms the lower jaw and contains the lower teeth. When there is an excessive vertical overlap of the upper and lower front teeth, it results in an overbite.
An overbite can occur when the maxillary anterior teeth extend too far vertically, causing them to cover a large portion of the mandibular anterior teeth.