Design characteristics of the S2

  1. High sides provide good retention without moulding.

  2. 4 small breathing holes designed to encourage nasal breathing.

  3. Tongue tag guides the tongue forwards and upwards into the correct position.

  4. Tongue elevator holds the tongue in the correct position.

  5. 4 posterior holes decompress the jaw joints for added comfort.

  6. Provides optimum jaw position and vertical opening for most patients.

How the S2 works

Myosa® for TMJBDS® S2 is designed for patients who are not chronic mouth breathers or who have already undergone 'stage 1' treatment with the S1 or S1M appliance. The Myosa® S2 works by advancing the sleeper’s lower jaw and opening the bite, which has the effect of opening the airway. The smaller breathing holes at the front of the appliance optimise breathing regulation by encouraging nasal breathing and lip seal maintenance. For better retention during the night, the patient can use the mouldable version of the S2 appliance (S2M), which provides a tighter, custom-fit due to its dual moulded construction.


Patient Selection
TMJBDS® appliances are used based on a combination of the patient’s ability to retain the appliances overnight, severity of their breathing dysfunction and their performance of Breath Hold Time activity (BHT). The non-mouldable S2 as well as the S2M (mouldable version) - is used in the second stage of treatment if BHT is less than 30 or more. The non-mouldable S2 appliance provides optimum comfort while the mouldable S2M allows for the best retention. Auxiliary appliances that aid treatment are based on the level of the patient’s joint degeneration and serve as adjuncts to the use of the TMJBDS® appliances. The full protocol is outlined in MRC’s courses and attendance is highly recommended. Additionally, you can download the Myosa® appliance protocol.


Indications for use
Prior to using the Myosa® device, the treating dentist may refer the patient to a medical practitioner for assessment of sleep disorders that have medical implications. The Myosa® intra-oral appliance provides treatment for patients with symptoms of TMJBDS® and is to be used during the day until comfort is achieved. Once accustomed, it should be used for 1 hour per day and overnight while sleeping.


Instructions for use

Do not chew on Myosa® appliance. Initially use the S2 during the day to correct habits. The S2M appliance can be used at night to increase retention.


Cleaning the S2 appliance
The S2 appliance should be cleaned under warm running water every time the patient removes it from their mouth. Use Myoclean™ tablets to correctly clean twice a week. Myoclean™ is the recommended cleaning agent for MRC's appliances.

Appliance use

Works in Conjunction With

the Myosa® S2M (mouldable) - default night time appliance.

Next Appliance

Myosa® S3 

See this appliance

Learning Resources

Myosa® Appliance Protocol

Myosa® Appliance Catalogue

Myosa® S2 Instruction card

Important Points

Intra-oral appliances may change the position of teeth and alter the jaw relationship. Unlike Rigid Mandibular Advancement Devices (MADs), the Myosa® appliances are flexible and minimise the potential to cause pain in the jaw joints or permanently change the bite.

Consultation with a Medical Practitioner is essential to correctly evaluate your condition.