Design characteristics of the i-3N

  1. Flexible material - for use in more extreme starting cases and for improved patient compliance and comfort.

  2. Tongue tag, guard and elevators - train the tongue to position properly.

  3. Small breathing holes and dual arch form - prevent mouth breathing (a common problem in Class III patients).

How the i-3N works

Myobrace Interceptive Class IIIi-3N

The Myobrace interceptive Class III™ is a three-stage appliance system designed specifically to correct poor oral habits while limiting the excessive lower jaw development problems commonly associated with patients who have Class III. The Myobrace Interceptive Class III™ is most effective before a child’s permanent teeth are coming through (ages 5 to 8) and is available in three sizes. The i-3N provides habit correction. It is made of flexible silicone to adapt to any arch-form and poorly-aligned teeth. Its flexible nature also means that it offers improved retention for night-time use.

The i-3N is available in three sizes, in yellow or clear.

MRC has pioneered the use of appliances to correct myofunctional habits in growing children and has proven success in orthodontic correction without braces. This treatment can also lead to better facial development in growing children. The key to this treatment is correcting the position and function of the tongue, obtaining correct nose breathing and retraining the oral muscles to function correctly.

Myobrace® appliances effectively train the tongue to position correctly in the upper jaw, retrain oral musculature and exert light forces to align the teeth.

Patient Selection
The i-3N is aimed primarily at children 5-8 years of age in the late-primary and early-mixed dentition with class III malocclusion.  It was designed to limit unwanted lower-jaw growth by correcting lowered tongue and open mouth posture; problems which are evident in the majority of class III patients. The i-3N® is not suitable for patients in the permanent dentition.

Directions for use

The i-3N must be worn for 1 hour each day and overnight while sleeping and always remember to follow these few simple steps:
• Lips together - at all times except when speaking.
• Breathe through the nose - to assist the development of the upper and lower jaws, and to achieve the correct bite.
• No lip activity when swallowing - which allows the front teeth to develop correctly.

Cleaning the i-3N
The i-3N 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.

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Appliance use

Designed For

  • Class III Malocclusion

Next Appliance

The next appliance in this sequence is the i3®.

See This Appliance

Important Points

The steps for correct dental and facial development are:

• Lips together.

• Breathe through the nose.

• No lip activity when swallowing.

Poor myofunctional habits such as incorrect swallowing and breathing through the mouth are the major cause of misaligned teeth and poor jaw development. Research has shown that the correction of these poor myofunctional habits improves facial and dental development.

Due to the nature of removable appliances, patient compliance is essential. Therefore it is important to only select motivated patients and parents. If motivation is a problem, it may be better to suggest the use of conventional brackets.

Arch Expansion

In more severe cases when the jaws are under developed, appliances such as the Farrell Bent Wire System™ (BWS™) and/or Biobloc may be required for extra widening of the dental arch form. An advantage of using the BWS™ is that it can be using in conjunction with the i-3N. MRC have also developed a procedure for composite build ups know as Myolay™. 

Click here for more information on the BWS™ and Myolay™.