CR vs Myocentric — What Is the Actual Difference?

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Occlusion Connections - Center for Orthopedic Advancement

Doctor EducationTwo Reference Points — One Fundamental Difference

Every occlusal treatment protocol requires a reference point — a jaw position the clinician can identify, record and build treatment around.

The debate between centric relation and Myocentric is fundamentally a debate about how that reference point should be found — and how you verify that it is correct.

CR finds the reference point through manipulation. The clinician physically guides the condyles to the most superior anterior position in the fossa — a repeatable mechanical process that bypasses muscular input.

Myocentric finds the reference point through measurement. The masticatory muscles are deprogrammed using low frequency J5 Dental TENS — and the mandible is allowed to find its own physiologic rest position without any external guidance or manipulation.

These are not minor technical variations of the same approach. They are fundamentally different philosophies about what a correct jaw position reference actually means — and how clinical truth is established.

What Centric Relation Is — And What It Assumes

Centric relation as defined by GPT-9 is the relationship of the mandible to the maxilla when the condyles are in the most superior position in the fossae — physiologic and unstrained — against the posterior slopes of the articular eminences.

The clinical technique most commonly used to achieve CR is bimanual manipulation — the clinician uses both hands to guide the mandible into the desired condylar position while the patient remains passive.

This technique assumes several things:

  • That the position the clinician’s hands can find is the same as the position the patient’s neuromuscular system considers physiologic and unstrained
  • That passive manipulation produces a genuinely relaxed muscular state
  • That the condylar position achieved through manipulation corresponds to the position the masticatory system will accept during function

These are significant assumptions. And they cannot be verified by the manipulation technique itself.

The only way to verify whether a condylar position is genuinely physiologic and unstrained — as GPT-9 requires — is to measure the muscular state objectively. Bimanual manipulation does not include a method for doing that.

What Myocentric Is — And How It Is Found

Myocentric is the mandibular position that results when the masticatory muscles are in a state of genuine physiologic rest — free from engrams, compensation patterns and habitual muscle tension.

It is not a position the clinician finds. It is a position the neuromuscular system reveals when the musculature is properly deprogrammed.

The protocol for finding Myocentric:

  • J5 Dental TENS — low frequency neuromuscular stimulation at 1.5 Hz for 45 to 60 minutes — rhythmically contracts and releases the masticatory and cervical muscles — gradually releasing the engrams and compensation patterns that have been holding the mandible off its true physiologic path
  • K7 jaw tracking — records the myo-trajectory the mandible follows as the musculature relaxes — confirming the path of closure in all six dimensions
  • Surface EMG — confirms that masticatory and cervical muscle activity is within physiologic range and bilaterally symmetric before the bite record is taken
  • Bite registration — taken at the end of the TENS cycle — at the position the mandible naturally finds when the musculature is confirmed relaxed — not guided by the clinician’s hands

The result is a measured physiologic position — not a manipulated one.

The Clinical Difference — What Each Position Represents

CR represents:

  • The position the clinician’s hands can reproduce
  • A condylar seating confirmed by tactile and visual clinical judgment
  • A reference point established through passive manipulation
  • A position that may or may not correspond to where the neuromuscular system wants to be

Myocentric represents:

  • The position the neuromuscular system finds when genuinely at rest
  • A condylar position confirmed by objective EMG measurement
  • A reference point established through physiologic deprogramming
  • A position the masticatory system has already accepted as stable before treatment begins

The difference between these two positions — sometimes less than a millimeter in any single dimension — is the difference between a case that holds and a case that keeps coming back.

In simple restorative cases with no significant muscle compensation the two positions may be very close. In complex TMD patients — patients with cervical dysfunction, disc displacement, significant occlusal accommodation or a history of instability — the difference can be clinically significant.

Why the Distinction Matters Clinically

The practical clinical implication of the CR vs Myocentric distinction is this:

When you build treatment around a manipulated position — CR — you are building treatment around where your hands put the patient. When the patient leaves the chair the neuromuscular system begins the process of finding its own resolution — which may not be the position you established.

When you build treatment around a measured position — Myocentric — you are building treatment around where the neuromuscular system already wants to be. The treatment reinforces a position the masticatory system has already confirmed as physiologically acceptable.

This is why GNM trained clinicians consistently report greater long term stability in complex cases — not because their technical skill is superior but because their reference position is measured rather than assumed.

The muscles always win. Myocentric works with the muscles. CR works around them.

Are CR and Myocentric Ever the Same Position?

This is one of the most common questions asked by CR trained dentists encountering GNM for the first time.

The honest answer is: sometimes — but not reliably — and without objective measurement you cannot know which situation you are in.

In patients with minimal muscle compensation, no significant TMD history and a well adapted occlusion the TENS deprogrammed Myocentric position may be very close to the manipulated CR position. In these cases both approaches may produce acceptable outcomes.

But in the complex patient — the patient whose cases keep coming back despite correct CR technique — the two positions are often measurably different. And it is precisely in these cases that the distinction between a manipulated position and a measured position determines whether the outcome holds.

The GNM protocol does not assume the two positions are different. It measures and confirms — and lets the data decide.

Continue Learning

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Written by Clayton A. Chan, D.D.S. — Founder and Director, Occlusion Connections | Las Vegas, Nevada

 6170 W. Desert Inn Road, Las Vegas, Nevada 89146 | Telephone: (702) 271-2950

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www.occlusionconnections.com

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