Design characteristics of the S1M (Mouldable)

  1. Soft thermoplastic material allows for a tight fit on the upper and lower teeth.

  2. Tongue tag encourages the correct resting position of the tongue.

  3. Air Spring Core™ both opens the airway and is comfortable for the jaw joints by allowing maximum vertical opening.

  4. Tongue elevators hold the tongue in the correct position.

  5. Dual moulded construction with a rigid inner frame and a soft outer layer for a custom fit.

  6. 2 large breathing holes regulate breathing for mouth breathers.

How the S1M (Mouldable) works

Myosa® for TMJBDS® S1 Mouldable (S1M) is specially designed for patients who have severe breathing dysfunction and cannot retain an S1 Non-Mouldable appliance overnight. The appliance helps with diagnosis and treatment of TMJBDS®. It works by advancing the sleeper's lower jaw and opening the bite, which has the effect of opening the airway. Additionally, the S1M has two large breathing holes at the front to regulate breathing as well as a patented Air Spring Core™ to cushion the jaw joint. The Dual layered technology with a soft outer layer and hard inner core to facilitate a custom fit. The S1 Mouldable allows the patient to regulate their mouth breathing whilst optimising fit and retention. This is the default appliance for night use while sleeping.


Patient Selection

The 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 S1 as well as the S1M (mouldable version) - is used in the first stage of treatment if BHT is less than 20. The S1M allows for the best retention while the S1 appliance provides optimum comfort. 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. The patient can repeat the moulding process as many times as needed during the treatment process.


Cleaning the S1M appliance
The S1M 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 default day time appliance, the Myosa®
S1 (non-mouldable)


Next Appliance

Myosa® S2

See this appliance


Learning Resources

Myosa® Appliance Protocol

Myosa® Appliance Catalogue

Myosa® S1M 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.