DEFINITION - Lower incisors protrude in front of upper incisors.
Causes - Hereditary - Horse may be born with underbite. Developmental - Ramps on lower premolars can cause lower jaw to shift forward resulting in an underbite.
RESULTING PROBLEMS - Prevents horse from chewing freely resulting in improper and excessive molar wear. Ramps, transverse ridges, wave complexes and sheared molar table angles will become more severe as horse is forced to chew incorrectly. Can also cause severe discomfort with the bit. Ramps can cause pain to the horse, i.e., TMJ etc., and create inversion, overflexion and rearing while being ridden with a bit.
SOLUTION - Equilibrate incisors, arcades and individual dominante molars.
Artwork Copyright © 2014 Kevin Rundle Equine Dentistry & Equilibration