Bernard Jankelson laid the foundations for a new occlusal philosophy that considered the neuromuscular system the key to the physiology of the masticatory system.
The objective of Neuromuscular Occlusion is the research for the right jaw-cranial balance of the dental arches. For intercusping to be effective, it has to satisfy certain requisites which are the fundamental principles of Neuromuscular Occlusion: closing trajectory, free space, compensation curve and occlusal morphology.
Back in 1969, Bernard Jankelson proposed using T.E.N.S. in dentistry. The prime instrument and basis of Neuromuscular Occlusion, T.E.N.S. (Endermic Electric Neural Stimulation) involves applying electro-stimulation principles to the field of stomatology. T.E.N.S. is able to relax the muscles innervated by the trigeminal and facial nerves, to allow studying the movements of the jaw and obtaining extremely precise calculations and readings of the myocentric position. T.E.N.S. allows stomatognathic operations that fully respect the patient's physiology and is a highly scientific method for dealing with the minefield of occlusal-postural problems during consultation, cooperating with physiatrists, physiotherapists, chiropractors, kinesi-therapists and osteopaths.
Acry Plus NM is similar to the natural tooth as it reproduces the primary cusps, marginal and triangular ridges to create a perfect match for the occlusal fossa.
The natural morphology is completed by Carabelli's cusp, the fifth accessory cusp that is only found in the sixth uppers, which also stabilises the occlusion through the sensorial effect on the tongue
during swallowing.
In the same way as Acry Plus, the overlaying 4 chromatic layers make Acry Plus NM extremely similar to the natural tooth.
TOOTH TO TOOTH occlusion ratio, a fundamental property to make Acry Plus NM more versatile in mounting.
To respect the concepts expressed by neuromuscular gnathology, the occlusion teeth must have contact
points and not contact planes.
Therefore Acry Plus NM obtains maximum intercusping with punctiform contacts: 
Fourth lower: stabilising tooth for the occlusion. The primary contact is on the distal vestibular cusp side with its own antagonist.
Fifth upper: contact between the palatal cusp with the lower distal fossa.
Sixth upper: contact between the mesiopalatal cusp on the ridge of the lingual cusps and the vestibular centres of its antagonist.
Seventh upper: contact between the mesiopalatal cusp with the
ridge of the lingual and vestibular cusps of the respective lower.
The special morphology of the NM tooth (relationship between depth of the cusp and fullness of the fossa) means the tooth can be used
in most common mounting techniques.
 Modul chart
Technique of use
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