Hypereruption of Incisors

Case History:

A 2 1/2-year-old filly in poor condition was brought to the wet lab for dental evaluation. Prior to arriving, the filly had been tied to a post. She had lunged back and hit her upper incisors on the post, fracturing her 501 and 601. There were some small fragments of the deciduous incisors left, but the majority of the centrals were missing (Fig. 173). Both the 101 and 201 were mobile and blood was coming from around the teeth. A Radiograph of the upper incisors looked normal for this age of horse (Fig. 174).


The remaining fragments of the 501 and 601 were elevated and removed, and the upper 101 and 201 were left slightly out of occlusion in hopes that they would tighten up with time. The horse was sent home with instruction to bring her back in 6 months. Approximately 4 months after the initial treatment, the owner noticed that her central incisors were extremely long. She had her regular veterinarian examine the horse and he cut 3/4” of tooth off of the central incisors at this time. The horse was brought back to the wet lab for her 6-month evaluation and we found that the central incisors were still longer than normal. Radiographs showed that the central incisors were hypererupting (Fig. 175). The pulp cavities were open and hollow. A needle was used as a probe to demonstrate the open cavities. There was feed packing around the tooth causing gingivitis. Both teeth were still loose and it was decided to extract both of the central incisors.


The interesting event in this case was the hypereruption of the loose incisors. We assume this occurred due to the inflammation and infection resulting from the initial trauma. The teeth were completely hollow with no remnants of pulp tissue remaining when extracted.