Why Your Reference Position Changes the Outcome

Many dentists restore patients to centric relation (CR) simply because that is what they were taught.

Seat the condyles.
Mount the case.
Build the occlusion.

But here is the real clinical question:

What happens when the patient’s system does not want to function there?

In many retrusion cases, wear patterns clearly show that the mandible repeatedly functions forward of the retruded position. The muscles guide it there. The patient grinds there. The teeth record it there.

Yet treatment often attempts to push the mandible back to a position the system has been trying to avoid.

This is where the debate between centric relation (CR) and myocentric position stops being academic.

It becomes a question of which reference position will actually stabilize the patient.

The Traditional Gnathologic Approach: Centric Relation

Classic gnathology defines centric relation (CR) as a joint-determined position that is independent of tooth contact.

From this perspective, treatment is straightforward:

1. Seat the condyles.

2. Build the occlusion to that position.

For many patients, this approach works well.

But in retrusion cases, a problem can arise.

If the mandible is habitually functioning forward of that seated position, forcing the mandible back may place the patient into a coordinate that increases:

• muscle strain

• airway restriction

• posterior joint loading

In other words, the occlusion may look ideal on the articulator, while the patient’s physiology is still trying to escape that position.

The Neuromuscular Perspective: Myocentric

Neuromuscular dentistry approaches the problem from a different starting point.

Instead of asking where the condyles can be seated, it asks:

Where do the muscles want the mandible to close when they are functioning without strain?

This terminal closure position is often described as myocentric.

It represents the point where the muscles are operating near optimal length-tension relationships.

Interestingly, when instrumentation is used to identify a myocentric position, it frequently aligns with what we see clinically when wear facets are properly aligned.

Wear Facets Are Not Random

When a patient grinds forward repeatedly, the teeth leave a record.

Those wear facets are not accidental.

They are the historical evidence of how the system has been functioning over time.

Ignoring that information and forcing the system into a different coordinate may create a conflict between:

• the occlusion we build

• and the neuromuscular patterns the patient already has.

A Practical Clinical Approach

You do not need to choose an ideology to manage these cases.

You need a clear diagnostic protocol.

A simple clinical sequence is:

1. Identify and align wear facets.
   This reveals the functional pathway the patient has repeatedly used.

2. Quantify the discrepancy.
   Measure the difference between maximal intercuspation and the functional position.

3. Confirm the coordinate when necessary.
   Objective metrics can help validate what the wear patterns suggest.

4. Test the position with a reversible orthotic phase.
   Stability should be confirmed before irreversible restorative treatment begins.

The Clinical Reality

In retrusion cases, the reference position you choose is not just an academic preference.

It can determine whether the system stabilizes or continues to struggle.

Dentistry often focuses on creating precise tooth contact.

But long-term success depends on something deeper:

whether the occlusion you build agrees with the patient’s physiology.

When those two coordinates align, treatment tends to hold.

When they do not, the system will eventually show you.

Understanding wear facets, discrepancy, and functional mandibular position is essential before committing to irreversible dentistry.

These diagnostic steps allow you to evaluate stability first, instead of discovering problems after treatment is complete.

Take TMJ Essentials now

Learn how to read wear facets, quantify discrepancy, and test your reference position with a reversible orthotic phase before you commit to irreversible dentistry.