Seated Condylar Position

I know even the mention of the words centric relation probably has some readers bristling, as this is a much argued over topic. With that said the research by Lundeen and Gibbs at the University of Florida shows that we do seat our condyles into the fossa during the chewing stroke. This seated condylar position is often used as a reference position to treat patients whether as part of reorganizing their occlusion to alleviate TMD symptoms or for restorative or orthodontic treatments.

Centric Relation & Parafunction

The next question is do people seat their condyles other than during normal function as part of the chewing stroke. I believe the answer is yes. One of the pieces of evidence is the number of patients that I have with wear facets that correspond exactly to their first point of contact with their condyles seated. These same patients do not mark this area with articulating paper in intercuspal position or when following their excursives.

I took the photo with this post in my office. The patient has no other wear facets. #31 has a small, less than .5mm combination sealant/occlusal composite on this tooth. The distal wear facet does not touch in intercuspal position or excursives, but will mark using a leaf gauge to seat the condyles as the first point of contact. This facet marks in both the arc of closure and a power wiggle or abbreviated excursive movement from this first contact. #31 is also split from the gingival margin on the distal over the marginal ridge and right to the margin of the composite. I have seen and restored multiple examples just like this. In my experience when the crown comes back from the lab we will be able to adjust it in without issue, but the patient will report it feels high, or it will become chronically sensitive. The solution will be to either adjust this crown in both intercuspal position and centric relation, or incorporate an equilibration with the restorative care.

My belief is this patient parafunctions in centric relation.

Learning from one another is one of the top benefits of dental continuing education.

One of the things that I value about continuing dental education is the opportunity to spend time with other dentists.  I always learn something I can bring back to my office. Recently while lecturing at Midwestern Dental School to the faculty, on of the faculty members told me about a new way to stabilize lower models when mounting, and was even kind enough to give me some samples.

Stabilizing a lower model during mounting with centric relation records is critical to the accuracy of the mounting.

Over the years I have tried about every idea possible to optimize mounting the lower model. If the model moves in the bite registration due to pressure during mounting, tipping or shrinkage of the stone it interferes with the accuracy of the mounting. To overcome this I have tried hot glue, compound, rubber bands, hanger wire bent into a V and probably many more.

We realized the Fleximount was incredible the first time we used it. Sold by WhipMix and developed for their articulator systems, I will say I have used it on other systems, and as long as there is a knob on the upper member of the articulator it works fantastic. The Fleximount is trapped inside the stone, so they are disposable. The lower model is held with even pressure directly against the upper( if mounting in MIP) or the bite record, therefore no tipping forces are present as with other stabilizer systems. Because it stays in the stone, you can walk away and let it come to a complete set, instead of having to stand and remove the stabilizer while the mounting stone is still somewhat soft. Both of these features result in a very accurate mounting.

Once the stone is set you simply cut away the rubber band material that is not inside the mounting stone. Now you can finish and groom the lower mounting.

Now that you have fabricated the platform, the next step is to capture the record with the patient. You will need a heat source and a blue Delar wax Pencil.

The first step is to heat the sides of the Master Wax Platform so they are tempered. Take the wax to the patient’s mouth and place it over the maxillary teeth. The anterior edge of the wax should be at the embrasure between the canine and the lateral. Bend the corners over the canines to help with retention. Press the wax against the teeth and ask the patient to close gently into the wax. Cool the wax with your air water syringe, have the patient open, and continue to cool the platform before removing from the mouth.

Using blue delar wax created a small bead where the lower canines have left an impression. Reseat the platform over the maxillary teeth and using bimanual guidance bring the lower canine cusp tips up until they just touch the blue wax. Have your assistant cool the wax with air. After removing the platform from the mouth add Delar wax where the second molars have left a cusp imprint. Then return the platform to the mouth and using bimanual guidance arc the patient into the wax so the lower molar cusp touches, then cool with air.

Your record should now be dropped into cool water. A disposable plastic container from the grocery works great. Write the patients name on it with sharpie marker and add it to their lab pan.

Analyzing a patient’s occlusion is key to providing optimal care. There are multiple ways to take a centric relation bite record, but one of the classics at Pankey has to be utilizing master wax. Easily mounting models in the laboratory is one of the main advantages of this method.

Although a slightly more challenging technique from a chairside perspective, it can still be accomplished with ease. Here is where to start:

Intro to the Master Wax Centric Relation Bite Record

Begin by gathering your necessary tools and materials. Start with a red master wax that looks just like baseplate wax from a standpoint of the size of the wax sheets, although it is different because it’s both softer and tackier. You will also need a blue wax pencil, scissors to cut the wax, a heat source such as an alcohol torch, and a way to light the heat source.

Take a single sheet of wax and temper it in the middle with the intention of being able to bend it in half. Once it is thoroughly tempered, bend it in half without cracking or breaking the wax. Make sure the bend is fairly crisp. After the wax has cooled a little bit, open it back up and cut it in half. Out of every sheet of wax, you should be able to generate two platforms for wax records.

Once again temper the wax halfway in the middle with the heat source. Tempering refers to heating to flexibility but not dripping. Again, fold the wax in half so you have a double thickness sheet. Then, cut the wax into the shape of the platform …

Look for the second part in this series about our master wax technique coming soon. And did you get a chance to read this Pankey Gram blog on enjoying Miami while you visit Pankey? Let us know what you think!

Function and esthetics are the two primary goals of excellent treatment. Achieving them both simultaneously requires the right tools used with the best skill possible. The  Dento-Facial Analyzer is my go-to for gathering information I can use to improve the outcome of mounting a maxillary model.

In parts 1 and 2 of this series, I introduced the Dento-Facial Analyzer and began the discussion of how to capture records with it. Here, I’ll complete my overview of a solid technique:

Completing the Dento-Facial Analyzer Technique

… Ensure the Dento-Facial Analyzer is positioned level to the horizon both when looking straight on at the patient’s face from the anterior section and looking at them from the side. It should be level in both planes of space. Then, allow the bite silicone to set and have the patient hold to verify.

Remember that the main use of the Dento-Facial Analyzer is transferring three significant pieces of information. This is either intended for the laboratory or for when we mount our own models.

The first piece of information is the maxillary relationship – the distance to hinge access – which means it’s very important that the central incisors on the maxilla are seated against the plastic bite plate.

Second, we are transferring information about the occlusal plane and the incisal plane. From an incisal plane perspective, it’s crucial that the plate is level to the horizon as we look straight on at the patient once we have the analyzer in. The vertical rod on the analyzer indicates the center of the face – the facial midline – which can be given by the central philtrum of the upper lip or the center of glabella.

You should also look at how you’ve captured the record from a lateral view. This ensures the occlusal plane – the relationship of the cant from anterior to posterior teeth that exists in the patient’s face – is transferred accurately to the lab or onto the articulator. The side bar of the Dento-Facial Analyzer should be level to the horizon.

Do you use this simple and accurate tool?

For a hands-on demonstration of the Dento-Facial Analyzer from Pankey educators, learn more about our Essentials 1 course.

You can gather accurate functional and esthetic information using the Panadent Dento-Facial Analyzer for restorative cases. I’ve found this tool particularly effective compared to alternatives such as the Facebow or stick bite.

If you haven’t done so yet, make sure to check out the introduction to this series on the Dento-Facial Analyzer. It includes background information, armamentarium, and key reasons why the device can elevate patient care.

Without further ado, the Dento-Facial Analyzer technique:

Essentials of Dento-Facial Analyzer Technique

Once you have the white disposable plate – which is actually the piece you will send to the lab once the record is captured – snapped onto the Dento-Facial Analyzer, use VPS tray adhesive to lightly coat the plastic tray. You are only going to do this from about the canine position posteriorly because you aren’t going to put silicone on the anterior portion of that bite plate.

Next, attach the vertical reference bar to the Dento-Facial Analyzer. Without bite registration on it, take it to the patient’s mouth and seat the central incisors exactly against the white plastic in the front labially.

Verify that you can hold this level to the horizon in two planes of space and that you can touch the patient’s teeth. If not, you might need to build up the posterior.

If you’ve verified this, put bite silicone on the plate from the canine position back, then seat it again, making sure the central incisors are seated labially against the white plastic …

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I’ll round up this fun technique with Part 3 in the series coming soon.

For a hands-on lesson in the Dento-Facial Analyzer from our talented educators, check out our Essentials 1 Pankey course. Also, watch this video for a quick refresher or pre-course overview.  

The Dento-Facial Analyzer is a marvelous tool I use in the practice to mount maxillary models. It has made a huge difference in my practice of dentistry and is one of my favorite tools to teach.

Introduction to the Dento-Facial Analyzer

For the critical aspects of diagnostics and sending info to the lab for the completion of a restorative case, mounting models appropriately is so important. They must be mounted in three planes of space referenced to hinge access to capture esthetic information including incisal plane and occlusal plane relative to the horizon.

Traditionally, this has been accomplished by utilizing a Facebow, Earbow, or by actually capturing hinge access position. Now, we have the option of using the Kois Dento-Facial Analyzer to capture both functional information and esthetic information that we would normally get with a Fox’s bite plane or stick bite. All of this functionality is managed with one simple device.

The Kois Dento-Facial Analyzer was designed based on scientific information gathered by Dr. John Kois, which shows that the distance from the incisal edge position of the maxillary central incisors to hinge access on average is 100 mm. Most people fall within a range of 5 mm to the average, therefore this is the assumption made when the device takes a record.

The armamentarium for record capturing with the Panadent instrument includes the analyzer, bite registration silicone in a gun with a tip, VPS adhesive used in an impression tray, and disposable bite plates that snap onto the analyzer (from the device manufacturer Panadent).

You can use bite registration silicone, Panadent bite tabs, wax, or VPS heavy body impression material to capture the record …

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I’ll continue this review of the Dento-Facial Analyzer technique in Part 2, coming soon! And don’t miss one of my recent Pankey Gram favorites from Dr. Bill Gregg on an occlusion-focused hygiene exam. Read it here for his insightful tips.

For an in-person, hands-on lesson in the Dento-Facial Analyzer, check out our Essentials 1 Pankey course. You can also watch this video for a quick refresher.  

QuickSplint has many functions in general practice, but it is also a great resource overall in both diagnostics and restorative dentistry. It’s ideal for patients who grind, those with endodontic issues, and anyone needing a restoration.

QuickSplint to Improve the Patient Experience

Many dentists see patients who have wear on their teeth but don’t think they grind at all. They might have said that they used to grind their teeth, but they believe they don’t anymore. You can use the QuickSplint as a learning experience where the patient is able to recognize the cause of the attrition.

It’s nice to rely on this quick, easy, and inexpensive device. Go ahead and have the patient sleep in it for a little while. The QuickSplint will then reveal whether or not they are clenching and grinding. After the proof is clearly demonstrated, you can have an impactful conversation with your patient.

Another option for QuickSplint use is as a means for handling parafunction and restorative materials selection. Today, we talk a lot about posterior materials when we are doing crowns on first or second molars. Are we going to use high strength ceramics or traditional PFM restorations? Instead of guessing about the patient’s parafunctional risk and how much load they will place on the restoration, you can easily get that information with a QuickSplint.

Additionally, you can use the QuickSplint as a post-op device after an endodontic procedure. You can reduce a patient’s discomfort significantly in less than three minutes and also help the tooth heal without occlusal pressure. You then won’t have to take the entire occlusal table off the problem tooth. This can even work during pre-op for a patient whose tooth appears to need endodontic treatment.

In our Essentials One course at Pankey we use the Quicksplint as an overnight deprogrammer to allow us to capture very accurate diagnostic records.

Do you use QuickSplint in your dental practice? Tell us your best tips for using this handy little tool!

Early in my career, I became frustrated with splint therapy. In the clinical area it was working. In theory, it made sense to me that I should be able to take the appliance back through well-articulated CR casts and ultimately to my patient’s mouth.

Turned out, patients treated with splints were not beating down my door for definitive dentistry. Like Mick Jagger, I Couldn’t Get No Satisfaction. A decade later, I have experienced something magical happening and am singing a new Rolling Stones song in my head, Time is On My Side. (Yes it is!)

Time and Splint Therapy

Perhaps I was not waiting on my patients or more than likely they were waiting on me. I have hundreds of splints on unrestored patients that visit me a couple of times a year. They bring along the plastic to have it ultrasonically cleaned, sometimes tweaked, sometimes repaired.

There was a time when I believed the transition to treatment was a given once the appliance was well-adjusted on a patient willing to trust me with their investment in therapy. (I mean geez, that happens every time for the folks who taught me how to make one, right?) The presentation of the next phase was a conversation that probably sounded a whole lot like a sales pitch and generally fell flat on its face.

Time is on our side. I’ve grown to realize the virtue of patience and listening. Specifically, I listen for compliments, appreciation of the appliance, and sometimes simply a statement of dependency on the plastic. Sometimes this takes years. This is the time to ask, “Would you like to discuss dentistry that can make your teeth feel this way?” Sometimes they outright ask me.

Time is on our side. Appliance therapy is a seed. Our caring attention is a well-nurtured garden. Patients will bloom when they are ready.

My experience with splint therapy was like most dentist’s prior to developing the skills taught at Pankey. In fact, my appliance was not really therapy at all. Perhaps just a shot in the dark “helmet” that protected teeth against collisions with very little intention.

Throughout the years there have been many facets of my experience I value greatly in guiding patients to health using plastic:

Splint Therapy and Appliance Design

Appliance design is a provisional analog (that is, a practice replacement) for any changes we make to the teeth and ultimately the stomatognathic system. The splint is a great diagnostic tool that is capable of healing, but it’s also an iconic part of the behavioral interaction between the provider and the patient.

Aside from physically being an orthotic analog, the splint is a training tool, maybe even the greatest reversible “do-no-harm” in our profession. Case by case, each patient experiences changes and familiarizes themselves with my touch and caring.

Month by month and year by year dentists educate themselves and develop an understanding of bite relationships by using therapy. This happens case by case too, much like waxing cars and painting fences for Mr. Miyagi. As the experiences compile, sometimes our questions do as well. Sometimes we turn to our mentors for answers, much like the Karate Kid.

For the learning dentist, different parts come together when bringing splint therapy from the classroom to the operatory. There is the initial understanding of the “why” that can be conceptualized in theory, but not realized in practice until the “how” of the technical piece arrives through experiential understanding.

Each provider comes into their own by developing skills to have patients relate needs and eventually invite them confidently to enter appliance therapy.

There’s more to come in Part 2! What challenges have you faced in splint therapy techniques to ease patient discomfort?