Retainer (orthodontics)

A retainer helps your teeth stay straight.

You wear it after your teeth are fixed.

Teeth like to move back to old spots. This can happen for many reasons. A retainer holds them in place.

Some retainers use metal wires. These sit on your teeth. They can be taken out of your mouth.

Other retainers are made of clear plastic. They are hard to see when you wear them. They fit over your teeth.

Some retainers stay in your mouth. They are glued to the back of your teeth. This helps them stay put.

Keeping them clean is very important!

After you fix your teeth, they may want to move back. This is called relapse. Teeth move because of pressure from soft tissues or bone changes.

A retainer is a tool that holds teeth in place.

Some retainers are removable. You can take them in and out. The Hawley retainer is a famous kind. It uses metal wires and a plastic base. The base sits on the roof of your mouth.

These wires can be adjusted by a dentist.

Another kind is the vacuum-formed retainer. This is made of clear plastic. It is very hard to see when you wear it.

These fit over your teeth. They are easy to make. But, if you grind your teeth, they might break.

Some retainers are fixed. This means they stay in your mouth. A dentist glues a wire to the back of your teeth. This helps if your teeth move a lot.

You must keep all retainers very clean. Use a soft brush and mild soap. Do not use very hot water. Hot water can make the plastic shrink. Keep your retainer in a dry case when you do not wear it.

When teeth are straightened with braces, they do not always stay in their new spots. There is a lifelong risk called relapse. This is when teeth try to return to their original positions. This happens because of pressure from soft tissues or the recoil of periodontal fibres. Even a person's continued growth can cause changes.

A retainer is a special device used to hold teeth in place. These tools help the surrounding tissues adapt to changes in the bone. This helps minimize movement after orthodontic treatment is finished.

There are different ways these tools work. Removable retainers can be taken in and out of the mouth. Some people wear them part-time or full-time.

The Hawley retainer is a very well-known type. It uses metal wires that go around the front teeth. These wires are held by an acrylic baseplate on the roof of the mouth. This type is very strong and can be adjusted by a dentist. It can even have extra parts added to fix specific tooth rotations.

Another common type is the vacuum-formed retainer, or VFR. These are made of clear plastic like polypropylene or PVC.

They are made using a thermoforming process. This means heat and a vacuum help shape the plastic over the teeth. Because they are clear, they are almost invisible when you wear them. Some VFRs cover all the teeth, while others are just clip-on styles. They are often easier to make and can be more economical than other types.

Some people use fixed retainers that stay in the mouth. A dentist bonds a wire to the back of the teeth. They use a material called composite to glue the wire in place.

This is helpful for people with severe rotations or other stability issues. These can be made with smooth wire or a flexible spiral wire. While they do not rely on a person to remember to wear them, they are harder to clean. Patients must be careful to prevent plaque from building up around the wire.

Keeping a retainer clean is a very important job. If they are not cleaned, they can trap food and cause cavities.

You can clean removable ones with a toothbrush and mild, fragrance-free soap. It is important to avoid very hot water because it can make the plastic shrink. When you are not wearing a removable retainer, keep it in a dry container. Newer tools like SMART Retainers even use mobile apps to help people remember to wear them. These apps can even send notifications to parents to help children stay on track.

Orthodontic retainers are custom-made medical devices designed to maintain tooth position. After orthodontic surgery or realignment, teeth face a lifelong risk of relapse. Relapse is the tendency for teeth to return to their original, unstraightened positions. This movement occurs due to several biological factors. These include the recoil of periodontal fibres and pressure from surrounding soft tissues. Additionally, occlusion, which is how teeth meet, and a patient's ongoing growth and development can cause shifts.

By wearing a retainer, the surrounding periodontal fibres can adapt to changes in the bone. This process helps minimize changes to the final tooth position after treatment ends.

Removable retainers are devices that a patient can take in and out of the mouth. These may be worn part-time or full-time depending on an orthodontist's advice. One of the most famous types is the Hawley retainer. Named after its inventor, Dr. Charles A. Hawley, it consists of metal wires that typically surround the six anterior teeth. These wires, called a labial bow, are anchored into an acrylic baseplate that sits against the palate, or the roof of the mouth.

The Hawley retainer is robust and rigid. It allows for adjustments to continue minor tooth movements or to fix specific rotations. For example, an acrylic facing can be added to the labial bow to correct rotations. However, Hawley retainers can interfere with speech sounds like "d," "s," "t," and "i." They may also be less aesthetic than newer options.

A more modern removable option is the vacuum-formed retainer, or VFR. These are made from clear materials such as polypropylene or polyvinylchloride (PVC). They are created through a thermoforming process, which uses vacuum or pressure to shape the material.

VFRs are often nearly invisible when worn, providing an aesthetic advantage. Some designs fit the entire arch, while others are "clip-on" styles that only cover the teeth from canine to canine. Because VFRs cover the occlusal, or biting, surfaces, they may prevent the upper and lower teeth from touching if worn 24 hours a day. Some orthodontists suggest wearing them intermittently to allow for "favourable settling" of the teeth.

While VFRs are economical and easy to make, they have specific limitations. If worn while eating, they can act as a reservoir for cariogenic substances, which are substances that cause cavities. This can lead to decalcification of the teeth. Furthermore, patients with bruxism, or teeth grinding, may cause VFRs to break rapidly. Despite these risks, VFRs offer superior retention of lower incisors compared to many other removable types. Other specialized removable retainers include Begg retainers and Barrer retainers. Begg retainers have a labial bow that extends around the distal aspect of the terminal molar. Barrer retainers, also known as spring retainers, carry acrylic bows both labially and lingually.

Fixed retainers represent a different approach to orthodontic retention. Unlike removable versions, these stay in the mouth permanently. They typically consist of a wire bonded to the lingual or palatal surface of the anterior teeth. This bonding is achieved using acid etch and a material called composite.

Composite is used to bond and cover the wire while ensuring there is no interference in the interdental space between teeth. Fixed retainers are often used when instability is likely, such as in cases of severe rotations or median diastemas. They can be made with a smooth wire or a flexible multi-strand spiral wire. While they do not require the patient to remember to wear them, they are more difficult to clean. Patients must be diligent to prevent plaque accumulation and gingival inflammation.

Proper maintenance is essential to prevent dental issues. If retainers are not cleaned, they can trap food and lead to caries, or cavities. Removable retainers can be cleaned with a toothbrush, fragrance-free soap, or non-abrasive toothpaste. It is important to avoid very hot water, as this can cause the material to shrink. When not in use, retainers should be kept in a dry container and away from high temperatures. For fixed retainers, cleaning must be integrated into the nighttime oral hygiene routine. These habits ensure the appliance stays intact and the gums remain healthy.

Recent technological innovations are changing how patients manage their retention. Some practitioners worry that younger patients may not comply with wearing removable retainers. To address this, SMART Retainers and related mobile applications have been developed. These systems use the Internet of Things (IoT) and motion sensors to track and remind patients to use their devices. The mobile apps can even reward patients for consistent use. Some applications include a feature for parental notifications. If a child does not open their Smart Retainer Case, the parent receives a notification. This technology aims to decrease the number of adolescents needing additional orthodontic treatment due to non-compliance.