Final answer:
The mandibular curve of Spee is the occlusal parameter useful for distinguishing between a dental or skeletal overbite, as it involves the alignment of teeth in accordance with the skull's base curve.
Step-by-step explanation:
The occlusal parameter that is most useful to differentiate between an overbite of dental or skeletal origin is the mandibular curve of Spee. This curve is an anatomical feature that describes the concave shape on the mandibular side, involving the alignment of teeth as they conform to the curve of the base of the skull. If the overbite is due to a dental issue, it might be addressed with orthodontics that alter the curve of Spee. However, if the overbite is of a skeletal origin, the issue lies more deeply in the bone structure, including the mandibular or maxillary bone, and might require surgical intervention for correction.