Featured Item:
2004 Proceedings Book

Dentistry the Basics

By Dr. Shannon Lee

Dentistry - Sep 30th, 09

Dental care in the horse involves the same principles as human dentistry; many of the diseases seen in people’s teeth are also diagnosed and treated in the horse. For example periodontal disease or disease of the structures surrounding the tooth is the number one cause of premature tooth loss in both horses and humans. Just like people, horses experience dental pain. This pain comes from a number of sources. The maxillary branch of the infraorbital nerve innervates the teeth of the upper jaw of the horse, while the mandibular branch of the trigeminal nerve innervates teeth of the lower jaw. Horses certainly can experience severe pain caused by sensation to these nerves. Horses also experience pain due to oral ulcers, impacted teeth, feed packing in to spaces (called diastema) between the teeth, fractured teeth, unopposed teeth erupting into soft tissues, tooth root infections causing abscesses. These are a few of the ways in which horses experience pain and discomfort due to dental conditions.

Horses do have some important differences in the anatomy of there teeth. Horses are herbivores and their teeth are designed to grab and grind forage (grasses). Horses have two sets of teeth during their life and these teeth are constantly worn away by the actions of chewing and grinding. However the horse possesses extra tooth or reserve crown below the gumline in the jaw and this erupts at a similar rate to the rate at which tooth is worn away. Horses have enough reserve crown to last the average horse well into there twenties and certainly I personally have seen horses in there thirties that still had a functional mouth with all teeth present and able to chew. However this system of tooth being erupted and worn away must stay perfectly in balance or problems will quickly occur. Pain is the most common reason why the system gets out of balance, because in response to pain the horse will alter the way it eats and chews and this rapidly affects the wear patterns of the teeth. Another very important component of how the mouth is balanced is the diet. Horses evolved to graze with their heads down at ground level eating grasses for many hours a day. By altering their living and feeding conditions we alter the way their teeth wear. By forcing them to eat with there head up, providing short feeding times feeding grains, chaffs and pelleted feeds and when we do this we must be aware of the effects the changes have on the horses dentition. Horses also have another important anatomical difference from people. Their upper jaw when viewed from the front is wider than there lower jaw and this means that the outer surface of the upper cheek teeth (Closest to the cheeks) is unopposed as is the inner (closet to the tongue) surface of the lower cheek teeth. The edges or cingulae of these teeth grow through the continual process of eruption but are not worn away and form razor sharp points similar to the teeth of a saw blade.

Figure 1. Cheek ulcers caused by sharp points.

Figure 2. Large hook on 1st cheek tooth causing ulceration.

Because the horse chews in a complicated four part cycle not simply side to side or up and down theses points then act on the cheeks and tongue of the horse like a sawblade and cut them causing ulcers and if bacterial infection occurs abscesses Equine teeth are made up of three tissues enamel, cementum and dentine.

Figure 3. Close up of sharp points before floating.

Enamel is the hardest but most brittle and this is what the cingulae or sharp points are made of because of this brittleness these points can be removed relatively easily providing relief for the horse and all other things being equal a return to a normal chewing cycle. It is important that a thorough visual exam is made of a horse’s mouth, as there are many other conditions that commonly occur in the horse’s mouth many of which cannot be diagnosed without visualisation. These conditions are important and too complex to explain without a large amount of detail so I will not go into them here. I encourage all horses owners to take responsibility for ensuring their horses receive proper dental care, do your research and choose a qualified experienced professional who can explain what procedures they are performing and why. For more information visit www.TheHorse.com or www.aaep.org.

Figure 4.Close up of tooth after removal of sharp points.

Figure 5.series demonstrating removal of calculus from canine tooth, notice bleeding due to gingivitis and impacted feed material causing infection.

« Back

E-mail:
Password:

Remember Me
Password help