overshot jaw puppy manufacturer

Enzo is the Hawthorne Hills Veterinary Hospital Pet of the Month for May. Everyone knows that puppies need vaccines to keep them healthy and protected from diseases. However, it can be easy to underestimate the benefits of thorough and regular examinations when puppies are growing into adulthood. Every breed has special characteristics that make them unique and add to their appeal and sometimes there are physical changes that need to be addressed quickly. For this reason our veterinarians believe in examinations with every vaccine, especially during a puppy’s formative months.

Enzo is a short-haired Havanese and he was born with his lower jaw shorter than the upper jaw. This is called an Overbite, also referred to as an Overshot Jaw, a Parrot Mouth or Mandibular Brachygnathism. This malocclusion is a genetic change and can be seen in a number of breeds, oftentimes collie related breeds and dachshunds. Occasionally this change happens because of differences in the growth of the upper and lower jaws, and in many cases it doesn’t cause any significant problems other than cosmetically.

Dr. Robin Riedinger evaluated Enzo at his first visit when he was just 11 weeks of age and while the lower jaw was too short, there was no evidence of damage and no indication that this was causing a problem for Enzo. When there is abnormal occlusion of the teeth, it is important to monitor closely for trouble caused by the teeth being aligned improperly. Malocclusions can lead to gum injuries, puncturing of the hard palate, abnormal positioning of adjacent teeth, abnormal wear and bruising of the teeth, permanent damage and subsequent death of one or more teeth, and in the long run, premature loss of teeth. Some malocclusions can be severe enough to interfere with normal eating and drinking.

Within three weeks, when Enzo was only 3.5 months old, it was clear that our doctors would need to intervene. The left and right sides of Enzo’s upper jaw (maxilla) were growing at different rates because the lower canine teeth were being trapped by the upper canine teeth. This is called Dental Interlock. Because the teeth are ‘locked’ in place, the lower jaw cannot grow symmetrically and this creates a number of other problems. Early intervention is critical.

The solution for Dental Interlock is to extract the teeth from the shorter jaw; in this case, the lower ‘baby’ canines and thereby allow the lower jaw (mandible) to grow in the best way possible. This procedure is most effective when the Dental Interlock is discovered early and the extractions are performed quickly. In some cases, this can be as early as ten weeks of age. Dr. Riedinger consulted with a local veterinary dental specialist to confirm the treatment plan and to get advice on extracting the deciduous teeth without damaging the developing adult canines. Dental radiographs are essential to proper extraction technique and also to ensure that there are no other abnormalities below the gumline.

Once extracted, each deciduous canine tooth was about 2 centimeters long; the roots were about 1.5 centimeters. Many people are surprised to learn that the root of a dog’s tooth is so large – 2/3 to 3/4 of the tooth is below the gumline. This is one reason why it is so important to use radiographs to evaluate teeth on a regular basis, not just in a growing puppy. Adult teeth can, and frequently do, have problems that are only visible with a radiograph.

Enzo came through his procedure extremely well. He was given pain medications for comfort and had to eat canned foods and avoid chewing on his toys for the next two weeks to ensure that the gum tissue healed properly. As he continues to grow we will be monitoring how his jaw develops and Dr. Riedinger will also be watching the alignment of his adult canine teeth when they start to emerge around six months of age. Hopefully this early intervention will minimize problems for Enzo in the future.

This condition is most often spotted at either the first or second puppy checks or between 6 and 8 months of age as the permanent (adult) teeth erupt. Either the deciduous or permanent lower canines occlude into the soft tissues of the roof or the mouth causing severe discomfort and, possibly, oral nasal fistulae.

Secondly, the growth of the mandible is rostral from the junction of the vertical and horizontal ramus. If the lower canines are embedded in pits in the hard palate, the normal rostral growth of the mandible(s) cannot take place normally due to the dental interlock caused by the lower canines being embedded in hard palate pits. This can cause deviation of the skull laterally or ventral bowing of the mandibles (lower jaws).

Thirdly, the permanent lower canine is located lingual to the deciduous canine. This means that if the deciduous lower canines are in a poor position it is a certainty the permanent teeth will be worse. See the radiograph below. The deciduous canines are on the outside of the jaws and the developing permanent canines are seen in the jaw as small "hats". It is clear that the eruption path of the permanent canines will be directly dorsal and not buccally inclined as is normal.

The permanent successor tooth is located lingual to the deciduous tooth and wholly within the jaw at this stage. Any use of luxators or elevators on the lingual half of the deciduous tooth will cause permanent damage to the developing enamel of the permanent tooth. See the images below showing canines (and also the third incisor) with extensive damage to the enamel. The radiograph also shows how much damage can occur to the teeth - see the top canine and adjacent incisor. Some severely damaged teeth need to be extracted while other can be repaired with a bonded composite. This damage is avoidable with careful technique using an open surgical approach.

Do not try ball therapy with deciduous (puppy) teeth. There are two main reasons for this. Puppy teeth are fragile and can easily break. More importantly, the adult canine tooth bud is developing in the jaw medial to the deciduous canine tooth (see radiograph above in the puppy section). If the deciduous crown tips outwards the root will tip inwards. This will push the permanent tooth bud further medial than it already is.

The intention of the procedure is to keep the pulp alive and allow the shortened lower canines to develop normally and contribute to the strength of the lower jaws.

The advantage of this procedure is that the whole of the root and the majority of the crown remain. The strength and integrity of the lower jaw is not weakened by the procedure and long term results are very good due to the use of Mineral Trioxide Aggregate as a direct pulp dressing.

However, many owners are concerned (rightly) about the loss of the tooth and the weakness it may cause to the lower jaw(s). It is not our preferred option. This is not an easy surgical extraction and the resulting loss of the root causes a weakness in the lower jaws. This is compounded if both lower canines are removed.

Normally a composite resin bite plane is bonded onto the upper teeth (see below) with an incline cut into the sides. The lower canine makes contact with the incline when the mouth closes and, over time, the force tips the tooth buccally. This takes around four to eight weeks. The lower canine will often migrate back into a lingually displaced position when the bite plane is removed. This can occur if the tooth height of the lower canine is too short (stunted). If the lower canine is not self-retained by the upper jaw when the mouth is shut further surgery may be required.

An overbite is a genetic, hereditary condition where a dog"s lower jaw is significantly shorter than its upper jaw. This can also be called an overshot jaw, overjet, parrot mouth, class 2 malocclusion or mandibular brachynathism, but the result is the same – the dog"s teeth aren"t aligning properly. In time, the teeth can become improperly locked together as the dog bites, creating even more severe crookedness as the jaw cannot grow appropriately.

Dental examinations for puppies are the first step toward minimizing the discomfort and effects of an overbite. Puppies can begin to show signs of an overbite as early as 8-12 weeks old, and by the time a puppy is 10 months old, its jaw alignment will be permanently set and any overbite treatment will be much more challenging. This is a relatively narrow window to detect and correct overbites, but it is not impossible.

Small overbites often correct themselves as the puppy matures, and brushing the dog"s teeth regularly to prevent buildup can help keep the overbite from becoming more severe. If the dog is showing signs of an overbite, it is best to avoid any tug-of-war games that can put additional strain and stress on the jaw and could exacerbate the deformation.

If the dog is young enough, however, tooth extraction is generally preferred to correct an overbite. Puppies have baby teeth, and if those teeth are misaligned, removing them can loosen the jaw and provide space for it to grow properly and realign itself before the adult teeth come in. Proper extraction will not harm those adult teeth, but the puppy"s mouth will be tender after the procedure and because they will have fewer teeth for several weeks or months until their adult teeth have emerged, some dietary changes and softer foods may be necessary.

Types of malocclusionsClass 1 malocclusions occur when the upper and lower jaws are aligned (i.e. no underbite or overbite) but the teeth don’t come together properly because of crowding, misalignment, or rotation.

Class 2 malocclusionsare also known as an overbite. An overbite occurs when the maxillary (upper jaw) teeth are displaced forward relative to the mandibular (lower jaw) teeth.

Class 3 malocclusions are also known as an underbite. An underbite occurs when the mandibular (lower jaw) teeth protrude forward relative to the maxillary (upper jaw) teeth.

During your dog’s annual exam, your veterinarian will check your dog’s teeth and bite (another reason why annual exams are so important). If your puppy is developing any alignment issues, your veterinarian may suggest dental radiographs and may even refer your puppy to a veterinary dentist to correct any serious malocclusions before they become a problem.

Normally, a puppy will have 28 baby teeth once it is six months old. By the time it reaches adulthood, most dog breeds will have 42 teeth. A misalignment of a dog"s teeth, or malocclusion, occurs when their bite does not fit accordingly. This may begin as the puppy"s baby teeth come in and usually worsens as their adult teeth follow.

The smaller front teeth between the canines on the upper and lower jaws are called incisors. These are used to grasp food and to keep the tongue inside the mouth. Canines (also known as cuspids or fangs) are found behind the front teeth, which are also used to grasp. Behind the canines are the premolars (or bicuspids) and their function is to shear or cut food. Molars are the last teeth found at the back of the mouth and they are used for chewing.

With an overbite, the upper jaw is longer than the lower one. When the mouth is closed, a gap between the upper and lower incisors occurs. Puppies born with an overbite will sometimes have the problem correct itself if the gap is not too large. However, a dog"s bite will usually set at ten months old. At this time improvement will not happen on its own. Your pet"s overbite may worsen as the permanent teeth come in because they are larger and can damage the soft parts of the mouth. Teeth extractions are sometimes necessary.

The way the upper teeth align with the lower teeth is called occlusion. It is normal for most breeds to have a slight overlap of the upper front teeth. When the jaw is closed, the lower canine (fang) should fit in front of the upper canine. Most cases of malocclusion have a hereditary link.

Undershot is a class III malocclusion that is also referred to as mandibular prognathism, maxillary brachygnathism, mandibular mesioclusion, or an underbite. This malocclusion is characterized by a shorter upper jaw and a longer lower jaw, resulting in lower teeth that are in front of the upper teeth. While this condition is normal for some breeds, such as Bulldogs, in many breeds it is unusual. An undershot jaw occurs when the lower jaw grows faster than normal and becomes longer than the upper jaw, and is usually evident around 8 weeks of age in puppies. This misalignment can cause soft tissue trauma, such as to the lips. When the incisors meet instead of fitting next to each other, it is called a level bite. When the malocclusion causes the lower incisors to be placed in front of the upper incisors, it is called a reverse scissors bite.

The cause of overshot and undershot jaws in dogs relate to the increased or decreased rate of growth of the upper and lower jaws in relation to one another. This can occur due to a: Genetic disorder Trauma; Systemic infection ;Nutritional disorder; Endocrine disorder; Abnormal setting of puppy teeth; Early or late loss of puppy teeth.

After a quick physical exam, your vet may have to sedate your dog in order to perform a thorough oral exam. This will assess your dog’s skull type and teeth location in relation to the teeth on the opposite jaw. Often, the placement of the upper and lower incisors in relation to one another can determine what type of malocclusion your dog has. Your vet will note any areas of trauma due to teeth striking those areas, and any cysts, tumors, abscesses, or remaining puppy teeth that may be present. A dental X-ray can also help to assess the health of the jaws and teeth. These diagnostic methods will lead to a diagnosis of an overshot or undershot jaw in your dog.

Treatment of a jaw misalignment will depend on the severity of the condition. If your dog has a misalignment, but can still bite and chew food without problems, no treatment may be needed. If the misalignment is caught early in a puppy’s life, it may only be temporary and may correct itself over time. However, there are times when intervention may be needed. If your puppy’s teeth are stopping the normal growth of his jaws, then surgery to remove those puppy teeth may be performed. This may allow the jaws to continue to grow, but will not make them grow. For older dogs who are experiencing pain and trauma due to misaligned jaws and teeth, oral surgery is generally performed to extract teeth that are causing trauma, to move teeth so that they fit, or to create space for a misaligned tooth to occupy. Other therapies include crown reductions or braces.

If your dog is genetically programmed to have an overshot or undershot jaw, intervention can help, but will not slow or stop the abnormal growth of either jaw. Prevent jaw misalignments in puppies by not breeding dogs who have overshot or undershot jaws.

The way your puppy"s top and bottom dental arches intersect with each other is known as "occlusion." The scissor bite, where the upper incisors neatly overlap the lower incisors and the premolars meet in a sawtooth fashion, is the most common and most desirable type of occlusion observed in medium- to long-muzzled dogs. The even or level bite is another common type of occlusion, but in this case the incisors meet edge to edge. Because this type of contact wears down the teeth"s surfaces, a level bite isn"t considered ideal.

Also known as parrot mouth, over shot and over jet, an overbite occurs when the upper jaw extends beyond the lower jaw. Because the upper teeth overlap the lower teeth, this type of malocclusion prevents your pup"s chompers from aligning snugly as they should. Dogs with elongated muzzles such as collies, shelties, dachshunds, and Russian wolfhounds are commonly affected. Overbites are unfortunately classified as a class II malocclusion and a major genetic fault.

You may think the condition of your puppy"s gnashers is no biggie, but depending on the severity of the malocclusion, your pup may encounter several difficulties. A minor overbite may be a purely cosmetic concern, but in severe cases, puppies may have trouble chewing and injuries may result from the lower teeth hitting the roof of the mouth. To ensure your pup"s pearly whites are growing correctly, it"s a good idea to have them thoroughly examined by your vet when your pup is around 2 to 3 months of age.

Interestingly, kitties and puppies are naturally born with an overshot upper jaw so they"re capable of nursing. Then, once they"re weaned and have started eating solid food, their mandibles go through a growth spurt, nearly reaching their adult proportions. When this growth spurt doesn"t occur and the milk teeth erupt, the upper canines may protrude over the lower ones, preventing the lower jaw from developing to its proper length, according to the Merck Veterinary Manual.

If your pup"s overbite is causing you sleepless nights, consider that not all is lost, since the jaw is still developing. In some breeds, such as the German shepherd, an overshot bite may spontaneously correct on its own as long as the gap between the upper and lower incisors is not greater than the head of a wooden match. Keep an eye on your pup"s gnashers, as improvement may continue up until the puppy is 10 months old and his jaws stop growing.

In severe overbite cases, extractions and restorative treatments can help manage and prevent injury to the pup"s soft oral tissues. If you"re planning to breed your puppy in the future, consider that overshot bites have a genetic basis and can be passed down from generation to generation. Because of this, the American Kennel Club prohibits dogs who have received interventional orthodontic treatments from competing in the conformation ring.

Adrienne Farricelli has been writing for magazines, books and online publications since 2005. She specializes in canine topics, previously working for the American Animal Hospital Association and receiving certification from the Certification Council for Professional Dog Trainers. Her articles have appeared in "USA Today," "The APDT Chronicle of the Dog" and "Every Dog Magazine." She also contributed a chapter in the book " Puppy Socialization - An Insider"s Guide to Dog Behavioral Fitness" by Caryl Wolff.

Teeth will become easier to clean. Your risks for tooth decay and gum disease will decrease. You’ll also feel less strain on your teeth, jaws, and facial muscles.

Removal of one or more teeth on the lower jaw may also help improve the appearance of an underbite if overcrowding of the teeth is contributing to the issue. A dentist may also use a grinding device to shave down or smooth teeth that are large or stick out.

In cats and dogs with a normal bite, the bottom canine teeth will slightly overlap their top canines. For those with a class three malocclusion, the bottom canine teeth stick out a bit further than usual, and the bottom jaw may also be longer than the top. The bottom canines and incisors may be visible at all times, even when your pet’s mouth is closed.

There are two types of malocclusions in pets: skeletal and dental. A cat or dog with a skeletal malocclusion will have a mishappen jaw, while those with a dental malocclusion will have a typical skull and jaw shape with teeth that are misaligned.

When a kitten or puppy is born, their lower jaw is smaller so they can nurse from their mother. As their milk teeth grow in during their first few weeks, their lower jaw will grow longer. In some cases, the lower jaw grows too quickly, creating a misaligned bite.

Certain breeds are predisposed to developing an underbite. In some dog breeds, particularly brachycephalic breeds like the Pug, Boxer, and French Bulldog, an “undershot” jaw is listed as a desirable trait in the AKC breed standard.

Underbites do not always have a genetic cause. If an animal suffers a traumatic jaw injury, it can affect their bite alignment. Rough play, such as a strenuous game of tug-o-war, can put stress on developing jaw. Retained milk teeth can also affect final bite alignment when adult teeth come in.

A malocclusion is detectable in pets as young as eight weeks of age. In some cases, the puppy or kitten may grow out of it. In others, though, it can cause complications by the time your pet’s adult teeth grow in, which occurs around 6-8 months of age.

Your kitten or puppy may need early intervention treatment to correct their bite. Your veterinarian may refer you to a veterinary dental surgeon to remove teeth that are causing an issue if they’re not essential. It’s also possible to reduce the height of canines that dig into oral tissue. In some cases, orthodontic appliances, similar to braces for humans, can be used to shift teeth for a more functional bite.