Which cephalometric criterion is distinctive for deep bite skeletal form?

Which cephalometric criterion is distinctive for deep bite skeletal form?

• A. Increased IMPA angle
• B. Decreased maxillary plane and mandibular plane angle
• C. Increased goniac angle
• D. Diminished SNA angle

Answer: (B)

A skeletal deep bite is driven by a vertically short, horizontally inclined jaw relationship. Cephalometrically, this shows up as the maxillary plane and the mandibular plane being more horizontal relative to the cranial base, resulting in a reduced vertical facial dimension. The consequence is excessive incisor overlap, or a deep bite, that is rooted in the flattened plane angles of the jaws. The criterion described—decreased angles of both the maxillary plane and the mandibular plane—is the most distinctive cephalometric feature of this skeletal pattern. Other options relate to incisor tilt, overall mandibular angle, or maxillary position, which are not uniquely diagnostic for skeletal deep bite.

A skeletal deep bite is driven by a vertically short, horizontally inclined jaw relationship. Cephalometrically, this shows up as the maxillary plane and the mandibular plane being more horizontal relative to the cranial base, resulting in a reduced vertical facial dimension. The consequence is excessive incisor overlap, or a deep bite, that is rooted in the flattened plane angles of the jaws. The criterion described—decreased angles of both the maxillary plane and the mandibular plane—is the most distinctive cephalometric feature of this skeletal pattern. Other options relate to incisor tilt, overall mandibular angle, or maxillary position, which are not uniquely diagnostic for skeletal deep bite.