A Perspective Earned at Both Podiums

The debate between centric relation and neuromuscular dentistry is one of the longest running controversies in dental science. It has filled panel discussions at major meetings, generated decades of competing literature and divided continuing education into philosophical camps that rarely speak to each other.

The author of this page has sat at both tables.

As an invited expert panelist at the California Dental Association meeting in Anaheim, California in 2003 — alongside Drs. Tom Basta, Charles McNeil and Terrance Donovan, with Dr. Carl Rieder moderating — as an invited speaker at the American Equilibration Society — twice — the 52nd Annual Meeting in 2007 and the 56th Annual Meeting in 2011 — and as a presenter at the International Academy of Gnathology, the John Kois 111 Mentors Symposium in Seattle and the Pankey/Dawson Study Club in Chicago, Dr. Clayton Chan has engaged with the most rigorous proponents of gnathologic CR philosophy directly and collegially.

As former Director of Neuromuscular Dentistry at LVI from 2000 to 2006 and founder of Occlusion Connections — the most advanced GNM curriculum in the world — he has spent 37 years building the measurement framework that the neuromuscular side has always needed.

That experience — standing at both podiums, engaging both traditions with genuine respect and intellectual rigor — is what informs the perspective offered here.

This is not the voice of someone who won the debate. It is the voice of someone who transcended it.

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Why the Debate Exists — And Why It Has Lasted So Long

The CR vs NM debate has persisted for decades because both sides are partly right — and both sides are missing something the other has.

What the CR side has right:

The gnathologic tradition correctly identifies that condylar position matters. The disc-fossa relationship is clinically significant. Structural integrity of the temporomandibular joint is foundational to occlusal stability. The articulator is a legitimate diagnostic tool. The repeatability of a reference position has genuine clinical value.

These are not trivial insights. They represent decades of serious clinical scholarship and they have produced excellent outcomes in thousands of cases.

What the NM side has right:

The neuromuscular tradition correctly identifies that muscles matter. The masticatory system is not a static mechanical structure — it is a dynamic biological system governed by neurologic input. Muscle activity patterns, jaw trajectory and proprioceptive feedback are central determinants of where the mandible closes and whether an occlusal position will be stable long term.

The use of objective instrumentation — EMG, jaw tracking and TENS — to measure and confirm physiologic muscle rest represents a genuinely scientific approach to occlusal diagnosis that the gnathologic tradition has largely resisted.

What both sides have been missing:

A methodology that integrates structural and neuromuscular thinking into a single reproducible objective framework — and then verifies the outcome with measurement rather than assumption.

That is what GNM provides.

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The Wrong Question — And the Right One

The debate has been framed as a question of position:

Is centric relation the correct jaw position — or is the neuromuscular position?

This is the wrong question. It assumes that there is a single correct position that can be identified through either manipulation or muscle relaxation — and that the two approaches are in irreconcilable conflict.

The right question is:

How do you verify that whatever position you establish is physiologically accepted by the neuromuscular system — and how do you confirm that objectively?

This question cannot be answered by bimanual manipulation alone. It cannot be answered by TENS alone. It cannot be answered by articulating paper, by feel, by patient feedback or by visual contact assessment.

It can only be answered by objective measurement — EMG to confirm muscle balance, jaw tracking to verify the myo-trajectory, electrosonography to evaluate joint behavior and the J5 Dental TENS deprogramming protocol to achieve genuine physiologic rest before any record is taken.

When the right question is asked the debate between CR and NM dissolves. Because the right question is not about which position is correct — it is about how to verify that any position is physiologically stable.

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What GPT-9 Revealed About Where the Profession Is Heading

In May 2017 the American Academy of Fixed Prosthodontics published GPT-9 — the ninth edition of the Glossary of Prosthodontic Terms. For the first time in the history of the CR definition two words appeared that had never been part of any previous edition:

Physiologic. Unstrained.

The word retruded — which had defined CR from GPT-1 through GPT-4 — was fully and permanently abandoned.

This is significant. The profession’s own authoritative reference quietly moved toward the language of neuromuscular science. The definition of CR — the foundational concept of gnathologic dentistry — was updated to require that the condylar position be not merely reproducible but physiologically acceptable and free of muscular strain.

GNM had been making this argument for decades before GPT-9 validated it.

The trajectory of the CR definition — from retruded border position to physiologic unstrained position — tells the story of where the profession is heading. Not toward NM at the expense of CR. Not toward CR at the expense of NM. Toward a framework that integrates both and verifies the outcome with objective measurement.

That framework is GNM.

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Integration — Not Opposition

The clinical reality that 37 years of practice and measurement have confirmed is this:

The gnathologic structural insight and the neuromuscular physiologic insight are not opponents. They are complements. And the clinician who understands both — and has the instrumentation to measure and verify the integration of both — is the clinician who can resolve the cases that neither camp alone can fully address.

The CR trained dentist who encounters a case that does not hold despite perfect technique is not failing at CR. They are encountering the limit of what structural positioning alone can verify.

The NM trained dentist who encounters a case where the TENS trajectory does not produce a stable result is not failing at NM. They are encountering the limit of what physiologic relaxation alone can confirm without gnathologic structural understanding.

GNM addresses both limits simultaneously:

• Gnathic principles — condylar position, disc-fossa relationships, occlusal morphology and structural stability
• Neuromuscular principles — muscle physiology, myo-trajectory, proprioceptive balance and functional movement
• Objective measurement — K7 jaw tracking, surface EMG, electrosonography and J5 Dental TENS — the instrumentation that verifies the integration of both

When a clinician understands gnathic structure, neuromuscular physiology and has the tools to measure the integration of both — the debate between CR and NM is not resolved in favor of one side.

It simply becomes irrelevant.

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The Invitation

If you have been trained in CR and you have cases that do not fully resolve — this is not an invitation to abandon what you know. It is an invitation to add the measurement layer that will finally tell you why those cases are not holding — and what to do about it.

If you have been trained in NM and you find your trajectory results inconsistent or your outcomes unpredictable — this is not an invitation to abandon the physiologic philosophy. It is an invitation to add the gnathic structural understanding and the objective verification protocols that will make your results reproducible and defensible.

GNM is not a replacement for either tradition. It is the integration of both — verified by measurement — taught step by step in the OC Masterclass curriculum in Las Vegas.

The debate is over. The measurement begins.

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Continue Learning

🔹 CR vs Physiologic Occlusion

• Centric Relation Isn’t Outdated — But It Is Incomplete →
• Truth About Centric Relation: An Evolving Term →
• CR Is Reproducible — So Why Aren’t the Results? →
• Patients Don’t Live in Centric Relation — So Why Are You Treating Them There? →
• What Is Physiologic Occlusion? Why the Answer Determines Everything →
• CR vs Neuromuscular Dentistry — Why This Is the Wrong Debate →
• CR vs Myocentric — What Is the Actual Difference? →

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🔹 The Measurement Gap

• Why Your Dental Occlusion Doesn’t Hold — Even When Everything Looks Right →
• Why Dental Bite Adjustments Fail — And How to Finally Get It Right →
• Why Articulating Paper Does Not Reflect Functional Occlusion →
• What Does the K7 Technology Measure? →

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🔹 The Original Science Behind GNM

• Why OC is Different — The Original Science Behind GNM Dentistry →
• Scientific Truths: Bio-Physiology & Objective Measurements →
• GNM is Not the Same as NM — Why the Distinction Matters →
• Why Anterior Deprogrammers Fail the Complex TMD Patient →

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🔹 About the Author

• Dr. Clayton Chan’s Lectures Nationally and Internationally →
• About Dr. Clayton A. Chan →

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🔹 Ready to Train

• OC Masterclass Training — Course Schedule and Registration →