Fig. 1. A and B, Photos of the incisors of a 4.5-year-old gelding with a history of an untreated jaw injury as a yearling. The right lower jaw area is displaced rostral and several extra lower incisors are present. C and D, Lateral and V-D bisecting angle radiographs of the abnormal incisors pictured above. The five most rostral incisors appear to be deciduous teeth with shorter, mature reserve crowns. Two permanent teeth are axially rotated and displaced. Two unerupted corner incisors are developing in the jaw. Two permanent incisors are not present. The lower canine teeth appear normal.
Fig. 2. A and B, Mandibular incisors of a 9-year-old geld- ing. The 302 and 402 appear small and have excessive crown wear for a horse of this age. A bisecting angle D-V oblique radiograph of mandibular incisors and canine teeth (R70V-CdDO [intraoral]). This view demonstrates small crown fragments of deciduous teeth and no permeant tooth in the lower 02 posi- tions. The superimposition of the lower canines and corner in- cisors can be alleviated by taking 15° lateral oblique views.
any direction is helpful, and laser distance cali- brations help to standardize the technique. Ra- diation safety should be strictly adhered to when taking equine head radiographs. The primary beam should be collimated to include only the area of interest, and the hands of personnel should be protected and kept as far as possible from the area. Personnel should wear lead aprons, lead gloves, thy- roid guards, and dosimeters. All unessential per- sonnel should leave the vicinity when radiographs are being taken. Heavy sedation is required to properly position
the horse and reduce head motion, thereby reducing the need for repeat exposures due to movement ar- tifacts. A combination of detomidine hydrochlo-
