Orthodontia
According to many scholars and historians, braces date back to ancient times. Around 400-300 BC, Hippocrates and Aristotle contemplated about ways to straighten teeth and to fix various dental conditions. Archaeologists have come to discover numerous mummified ancient individuals with the appearance of metal bands wrapped around their teeth. It has been perceived that catgut, a type of cord made from the natural fibers of an animal's intestines, did the work that is done by today’s orthodontic wire used to close gaps in the teeth and mouth. A Roman tomb was found with a number of teeth bound with gold wire documented as a ligature wire, a small elastic wire that is used to affix the arch wire to the bracket. In the early years of the common era, philosopher and physician Aurelius Cornelius Celsus first recorded the treatment of teeth by finger pressure.Unfortunately, due to lack of evidence, the poor preservation of bodies, and primitive technology, not much research was done on dental braces until around the 17th century, although dentistry as a profession was making great advancements.
The application of braces moves the teeth as a result of force and pressure given on the teeth. There are four basic elements that are needed in order to help move the teeth. In the case of traditional metal or wire braces, one uses brackets, bonding material, arch wire, and ligature elastic, also called an “O-ring” to help align the teeth. The teeth move when the arch wire puts pressure on the brackets and teeth. Sometimes springs or rubber bands are used to put more force in a specific direction. Braces have constant pressure, which over time, move teeth into their proper positions. Occasionally adults may need to wear headgear to keep certain teeth from moving. When braces put pressure on one's teeth, the periodontal membrane stretches on one side and is compressed on the other. This movement needs to be done slowly otherwise the patient risks losing his or her teeth. This is why braces are commonly worn for approximately two and a half years and adjustments are only made every three or four weeks.This process loosens the tooth and then new bone grows in to support the tooth in its new position which is technically called bone remodeling. Bone remodeling is a biomechanical process responsible for making bones stronger in response to sustained load-bearing activity and weaker in the absence of carrying a load. Bones are made of cells called osteoclasts and osteoblasts. Two different kinds of bone resorption are possible which are called direct resorption, starting from the lining cells of the alveolar bone, and indirect or retrograde resorption, which takes place when the periodontal ligament has become subjected to an excessive amount and duration of compressive stress. Another important factor associated with tooth movement is bone deposition. Bone deposition occurs in the distracted periodontal ligament and without bone deposition, the tooth will loosen and voids will occur distal to the direction of tooth movement. A tooth will usually move about a millimeter per month during orthodontic movement, but there is high individual variability. Orthodontic mechanics can vary in efficiency, which partly explains the wide range of response to orthodontic treatment.
Changes in the shape of the face, jaw and cheekbones may occur as a result of braces. It is important for a patient to discuss these potential changes before starting treatment. Plaque forms easily when food is retained in and around braces. It is important to maintain proper oral hygiene by brushing and flossing thoroughly when wearing braces to prevent tooth decay, decalcification, or unpleasant color changes to the teeth.
There is a small chance of allergic reaction to the elastics or to the metal used in braces. In even rarer cases, latex allergy may result in anaphylaxis. Latex-free elastics and alternative metals can be used instead. It is important for those who believe that they are allergic to their braces to notify the orthodontist immediately.Mouth sores may be triggered by irritation from components of the braces. Many products can increase comfort, including oral rinses, dental wax or dental silicone, and products to help heal sores.
Braces can also be damaged if proper care is not taken. It is important to wear a mouth guard to prevent breakage and/or mouth injury when playing sports. Certain sticky or hard foods such as taffy, raw carrots, hard pretzels, and toffee should be avoided because they can damage braces. Frequent damage to braces can prolong treatment. Some orthodontists recommend sugar-free chewing gum in the belief that it may expedite treatment and relieve soreness; other orthodontists object to gum chewing because it is sticky and may therefore damage the braces.In the course of treatment orthodontic brackets may pop off due to the forces involved, or due to cement weakening over time. The orthodontist should be contacted immediately for advice if this occurs. In most cases the bracket is replaced.
When teeth move, the end of the arch wire may become displaced, causing it to poke the back of the patient's cheek. Dental wax can be applied to cushion the protruding wire. The orthodontist must be called immediately to have it clipped, or a painful mouth ulcer may form. If the wire is causing severe pain, it may be necessary to carefully bend the edge of the wire in with a spoon or other piece of equipment (e.g. tweezers, clean eraser side of a pencil) until the wire can be clipped by an orthodontist.Patients with periodontal disease usually must obtain periodontal treatment before getting braces. A deep cleaning is performed, and further treatment may be required before beginning orthodontic treatment. Bone loss due to periodontal disease may lead to tooth loss during treatment.
In some cases, teeth may be loose for a prolonged period of time. One may be able to wiggle one's teeth for a year or two after treatment or longer.The dental displacement obtained with the orthodontic appliance determines in most cases some degree of root resorption. Only in a few cases is this side effect large enough to be considered real clinical damage to the tooth. In rare cases, the teeth may fall out or have to be extracted due to root resorption.Pain and discomfort are common after adjustment and may cause difficulty eating for a time, often a couple of days. During this period, eating soft foods can help avoid additional pressure on teeth.
The metallic look may not be desirable to some people, although transparent varieties are available. According to a survey published in the American Journal of Orthodontics and Dentofacial Orthopedics, dental braces with no visible metal were considered the most attractive. Ceramic braces with thin metal or clear wires were a less desirable option, and braces with metal brackets and metal wires were rated as the least aesthetic combination.
Typical treatment time is from eight months to two years, depending on the severity of the case, location and age.Treatment can be accelerated using state-of-the-art technology, novel planning, and positioning techniques. Anyone who has braces for over 24 months, has them for too long but in some cases the time taken may be bit long.
In order to avoid the teeth moving back to their original position, retainers may be worn once the treatment with braces is complete.Patients may need post-orthodontic surgery, such as a fiberotomy or alternatively a gum lift, to prepare their teeth for retainer use and improve the gumline contours after the braces come off.
Hawley retainers are the most common type of retainers. This picture shows retainers for the top and bottom of the mouth. In order to prevent the teeth moving back to their original position, retainers may be worn once the treatment with braces is complete for the patient depending on their specific needs. Retainers help in maintaining and stabilizing the position of teeth long enough to permit reorganization of the supporting structures after active phase of orthodontic therapy.If the patient does not wear the braces appropriately for the right amount of time, the teeth may move towards their previous position. For regular traditional braces Hawley retainers are used. They are made of metal hooks that surround the teeth and are enclosed by an acrylic plate shaped to fit the patient's palate. For invisalign braces an Essix retainer is used. They are similar to the regular invisalign braces and is a clear plastic tray that is firmly fitted to the teeth that stays in place. There is also a bonded retainer where a wire is permanently bonded to the lingual side of the teeth, usually the lower teeth only. Doctors will sometimes refuse to remove this retainer, and it may require a special orthodontic appointment to have it removed.
The pre-finisher is molded to the patient's teeth by use of extreme pressure to the appliance by the person's jaw. The product is then worn a certain amount of time with the user applying force to the appliance in their mouth for 10 to 15 seconds at a time. The goal of the process is to increase the exercise time in applying the force to the appliance. If a person's teeth are not ready for a proper retainer the orthodontist may prescribe the use of a preformed finishing appliance such as the pre-finisher. This appliance fixes gaps between the teeth, small spaces between the upper and lower jaw, and other minor smaller problems.