Twin Block Appliance for Braces Orthodontics

Twin Block Functional Appliance for Braces Orthodontics

What are Twin Block?

Twin-Block or the twin block are removable appliances used to correct occlusion anomalies. Twin Block allow you to effectively influence the growth process of the jaws, change the state of the muscles of the maxillofacial region, normalize the function of the dentoalveolar system, the position of the teeth and carry out early correction of anomalies. It consists of two removable orthodontic plates that allow you to change the ratio of the jaws and the shape of the dental arches.

Indications for use

Teeth twin blocks are an inexpensive and fairly effective appliance for treating occlusion pathologies. As a rule, it is used in childhood and adolescence, when the bite changes and the entire jaw system is formed, so the treatment does not take much time. However, the use of twin blocks is also possible in adult patients as an additional method of bite correction first. For example, before installing braces or aligners.

Distal bite
Mesial bite
Open bite
Correction of the shape of the lower or upper jaw.

Slowing down or accelerating the development of the jaw, the growth of some teeth,
Keeping the teeth in the correct position.

Changing the position of the incisors,
Stretching or narrowing of the palate
Use as a retention device to consolidate the results of treatment with braces

The best effect is given in children during the change of a milk bite to a permanent one.

Types Of Twin Block

Classic plates: equipped with hooks and metal arches, are used to correct the position of the teeth

Plates with active screws for expanding or narrowing the jaws.
Plates to protect against bad habits,
Plates with artificial teeth, which make up for defects in the dentition.

The effects of using the Twin Block apparatus

The greatest result can be achieved when using the twin blocks during the period of active growth of the jaws. It can be used up to the age of 13-14. The active period of treatment, when the device needs to be worn around the clock, lasts 9-12 months. Further, for about a year, it will need to be worn only at night.

After the first months of treatment, the patient's appearance improves. Distal occlusion is removed. Twin blocks prevents the habitual incorrect closing of the jaws and allows removing the block of the lower jaw and eliminates the occlusion anomaly. When treating mesial occlusion, the upper jaw is shifted forward, the ratio of the jaws is normalized.

Twin-Block advantages

Convenience. The patient takes food without removing the apparatus. Moreover, the chewing load enhances the effect of the treatment.

Nice aesthetics. The device is supplied with thin vestibular arches or has no arches at all. It is almost invisible to others.

Fast normalization of facial features and proportions.

Fast adaptation. After a few days, diction and the process of chewing food are normalized. The patient does not experience any discomfort or pain when using twin block.

What is Twin Block Made Of?

Twin Block, as a rule, are removable structures that have a soft plastic base, as well as metal elements - hooks, arcs, springs and screws. They are created in such a way that the base fits snugly against the palate or gums, and the metal clips securely hold the structure in the mouth.

The most key element of these twin blocks is the screw, which is located in the center of the polymer base. It is he who provides the adjustment of the size of the apparatus, as well as the force of pressure on the teeth and jawbone. Due to this, it is possible to significantly expand the jaw and at the same time displace part of the teeth, or, conversely, reduce the size of the jaw. At the same time, the hooks act as a fixture for the entire structure, and the metal arch allows you to fix the teeth in a certain position.

Making and Fixing Twin Block

Making Twin Block is less difficult than of other orthodontic systems. Nevertheless, it takes about a couple of weeks from the moment of the diagnosis of the bite condition to the direct fixation of the apparatus on the teeth - this time is required for the development and fitting of the structure.

Diagnostics of the bite condition
Taking impressions, creating a model of the jaw, which allows you to simulate the process of orthodontic treatment,
Making of the apparatus in laboratory.
Fitting the plate - it is important that it fits snugly to the palate, gums and teeth, but at the same time does not rub the mucous membranes and does not cause painful sensations.

Fitting and fixing the device.
It is required to wear plates from 3-4 hours a day to a full day - it all depends on the degree of pathology and the need to influence the jaw system. Plates are removable devices, so they are allowed to be removed during meals and hygiene procedures. These devices require strict self-control - they must be worn for a strictly allotted time, otherwise the treatment will not give a positive effect.

Getting used to the appliance

In the early days, wearing the twin block can be associated with minor inconveniences - speech may be impaired, there is a feeling of the presence of a foreign body in the mouth. This is absolutely natural, and after a few days even the smallest patient adapts to the device, ceasing to feel discomfort. As a rule, dental plates are not felt as early as three to five days after insertion.

Twin Block Care

Twin blocks are a removable device, that is, at the time of eating, as well as during hygiene procedures, they must be removed from the mouth. After eating, rinse the mouth with water, remove food debris from the interdental spaces. Before installation, the plate itself should also be rinsed under running water, and in the morning and in the evening, be sure to clean it with a toothpaste and a brush.

Alternative Methods

Twin Blocks are mainly used in childhood. Therefore, there are few options for correcting the bite - braces and aligners are not installed during the formation of the jaw system, that is, at least until the age of 12-13 years. An alternative can be other orthodontic appliances - for example, trainers, palatine clasps, etc. However, the need to use a particular system is determined only by the attending physician based on the complexity of the initial situation.


Effects of Twin-block vs sagittal-guidance Twin-block appliance on alveolar bone around mandibular incisors in growing patients with Class II Division 1 malocclusion
The twin block technique. A functional orthopedic appliance system
Frankel 2 appliance versus the Modified Twin Block appliance for Phase 1 treatment of Class II division 1 malocclusion in children and adolescents:
Dentoskeletal effects of class II malocclusion treatment with the modified Twin Block appliance

Den Tim

Practicing Dentistry for 20 years