Fractured Teeth

In dogs, fractured teeth are most often caused by chewing on inappropriately hard objects, such as elk antlers or marrow bones, but can also be the result of trauma. The 4th premolar and 1st molar are the carnassial, or chewing teeth, and these are the most likely to be fractured when chewing on hard bones such as elk antlers and marrow bones. Canines are more likely to fracture as a result of trauma or destructive/cage chewing behaviors. In cats, the canines are susceptible to fracture during outdoor adventures.

 

 

 

Diagnosis of Fractured Teeth:

Dogs and cats rarely show signs of pain, even when they have broken teeth. For that reason, broken teeth are most commonly diagnosed by a veterinarian on a routine physical examination. For those that brush their dog’s teeth regularly, a sensitive spot and/or bleeding might be noted while brushing. Rarely, one will be with their pet when the fracture happens and notice bleeding from the tooth.

 

A fractured 4th premolar tooth in a dog with obvious exposure of the pulp.

 

Treatment of Fractured Teeth:

Understanding the treatment options for fractured teeth relies on a basic understanding of tooth anatomy. The outer surface of the tooth is covered by enamel, the hardest substance in the body. Enamel is only formed during the development of the tooth, so once lost, it cannot be regenerated. The bulk of the tooth substance under the enamel is dentin. Dentin is made of millions of tiny tubules that connect to the living part of the tooth, or the pulp. The dentinal tubules are responsible for tooth sensitivity when they are exposed as a result of fractures, gingival recession, or cavities. Underneath the dentin is the pulp, the living part of the tooth that contains blood vessels and nerves that keep the tooth healthy. Once exposed or diseased, the pulp will quickly become inflamed and painful and will eventually undergo necrosis, or death.

There are many different classifications for dental fractures, but for the purposes of this article, we are going to focus only on uncomplicated (no pulp exposure) and complicated (pulp exposure) fractures. It is important to fully define the fracture in order to determine what treatments are necessary. Sometimes it is easy to see if the pulp is exposed or not, but often times it is not due to either the chronicity of the disease or the small size of the pulp chamber, so a complete evaluation under anesthesia and dental radiographs are required to assess the severity of the fracture.

Uncomplicated crown fractures, or those that do not involve the pulp, require radiographs for full evaluation. If the roots are normal on radiographs and there are no signs of endodontic disease (disease of the pulp of the tooth), then treatment might not be required and monitoring with x-rays in the future will be recommended.  However, if there is a large region of dentin exposure, then a bonded dental sealant and composite restoration can be applied to protect the underlying dentin and keep the patient from suffering any sensitivity.

Complicated crown fractures, or those with pulp exposure, require treatment of the inside of the tooth (root canal therapy) or extraction. We cannot expect a dog or cat to tell us what hurts or point to a bad tooth, so we shouldn’t rely on signs of pain to dictate treatment! If the pulp of a tooth is exposed, the tooth is already, or will soon be, infected and will require treatment, even if your dog or cat has no outward signs of pain. Treatment options can vary based on the age of the dog/cat and the tooth involved, so if your pet suffers from a fractured tooth, one can seek out the opinion of a veterinary dentist in your region for options. In general, fractured teeth can be treated with either root canal therapy or extraction. Root canal therapy is generally reserved for the larger and more structurally important teeth in the mouth, namely the canine teeth and the carnassial (chewing) teeth, the maxillary 4th premolars and mandibular 1st molars. However, based on the circumstances, other teeth can be candidates for this treatment as well.

1-   Root canal therapy involves removal of the pulp of the tooth, disinfection of the pulp space, and filling with materials that will prevent the tooth from becoming diseased in the future. Root canal therapy prevents the need for surgical removal of a tooth and as such, the patient has a quicker recovery time. Additionally, we have the ability to save large and functional teeth, which is a huge benefit! However, it is extremely important to understand that when root canal therapy is performed, rechecks are mandatory. Recheck examinations and x-rays involve anesthesia, and these are generally recommended once yearly (sooner if the tooth is already diseased when the root canal is performed).

• Root canal therapy is not recommended if the fracture of the tooth involves the root or if the tooth is severely diseased, i.e. if there is localized swelling, draining tracts, or severe disease is noted on radiographs.
• Our primary goal as veterinary dentists is to make sure your dog or cat has a healthy mouth that is free of pain and infection. If we feel that a root canal procedure has a high chance of failure, extraction should be recommended and will be better for your dog/cat in the long run. Please remember that no matter what your dog’s purpose or lifestyle (even working breeds!), they can survive and thrive without that broken tooth!
• Root canal therapy is performed in one or two stages depending on the age of the fracture and the state of disease of the tooth. Root canals for recently fractured teeth, very young teeth, and teeth that are severely diseased are often performed in two stages to allow proper disinfection of the tooth and removal of all of the pulp. This will ensure a better long-term outcome.

Root canal therapy of an upper 4th premolar tooth.

 

2-   Extraction of teeth involves surgery to remove the entire crown and root(s) of the tooth. Depending on the tooth, this can be a major surgery, especially for the canine and chewing teeth as noted above. However, this is a procedure that is performed often on dogs and cats and they recover very well. Dogs and cats do very well with tooth loss as their teeth don’t shift out of place when one is missing, nor do they have any changes to their occlusion. Additionally, loss of teeth rarely results in change of behavior, eating ability, or ability to play and chew on toys/bones. So, aside from the surgical recovery time of 7-10 days following a major extraction, this is a very acceptable option for broken teeth that are severely diseased. Generally speaking, extraction is a less expensive option as it involves a shorter time under anesthesia and less materials. Once the extraction has healed, no further rechecks are necessary. For those that are concerned about repeated anesthesia, cost, or other concerns about general health, extraction should be considered over root canal therapy.

 

This sweet dog still has a beautiful smile despite losing the upper 4th premolar!

 

Consequences of untreated fractured teeth:

As stated above, dogs and cats are very good at hiding signs of oral pain. For that reason, visible signs or symptoms of dental problems are rare. If broken teeth are left untreated due to the lack of signs of oral pain, they will progress to infection that can lead to facial swellings, draining wounds, and bone/soft tissue infections. While antibiotics might initially improve these wounds, they are short-term band-aid and should not be relied upon to treat dental disease of any nature. Additionally, they will eventually become ineffective if used for long periods of time. Surgical treatment is the only option when faced with broken teeth.