How Ivoclean Works 

Lee Ann Brady, DMD 

Saliva on the inside of restoration surfaces greatly reduces the bond strength between the porcelain and the cement but during the intraoral try-in process, it is inevitable that there will be saliva contamination. 

Most dentists I know use Ivoclean from Ivoclar to clean their indirect restorations after try-in. It is an incredible material for removing saliva and other contaminants that the restoration is exposed to during the intraoral try-in process.  

We trust Ivoclean to fully remove resin or traditional cements, as well as saliva and red blood cells to produce a super pristine surface.  

Did you ever wonder how Ivoclean works to get rid of saliva and all the other debris that gets on the inside of a ceramic restoration or metal base?  

Intraoral contaminants contain lots of phosphates. Ivoclean contains suspended zirconia particles that have an affinity for phosphates. The zirconia particles pull towards them the phosphate-laden particles, so when you rinse off the Ivoclean, the intraoral debris is rinsed away leaving a clean surface. 

Note: We don’t want to expose zirconia restorations to something that contains phosphates or includes phosphoric on the label because there is a strong attraction at an elemental level between zirconia and phosphate particles. To neutralize the ionic bond between saliva phosphates and zirconia, we need an alkaline solution such as potassium hydroxide (KOH). This is the active ingredient in products such as ZirClean from BISCO. 

Dental Sleep Medicine in Restorative Practice Part 9: Marketing Dental Sleep Medicine 

By Todd Sander DDS 

How do you start reaching out to physicians and other providers to build a dental sleep medicine practice? Start with the ones you know. Start with your own personal physician and start a conversation. If your dental patient is on CPAP, get permission to converse with their doctor. I spend time contacting many primary care doctors and find they are the ones who know patients are non-compliant with their CPAP therapy. They help me get patients re-evaluated by a sleep specialist. 

This may not be true in your community, but in Charleston, SC, where I practice, many primary care doctors don’t know what to do with their non-compliant CPAP patients. They are thrilled to have someone to refer them to try alternative therapy. 

Years ago, I reached out to sleep testing centers to communicate my services. Both independent sleep labs and hospital-based sleep labs have been great sources of referrals. For many years, I was the dental advisor to a sleep lab. A great conversation starter with sleep physicians, is the potential of combining CPAP and an oral appliance. This often allows the CPAP air pressure to be turned down so their patients be more comfortable and compliant. 

When you screen your dental patients for airway issues such as sleep apnea and snoring, the next step is referring your patients with issues for a sleep study. When the patient discusses their symptoms with their primary care physician or a sleep physician, you are mentioned and often documented as making the referral. Over time, physicians come to know you as a go-to provider of dental sleep appliance therapy. This process is sped up when you take the time and initiative to contact your patient’s primary care physician with your patient’s permission. You can guide physicians and remind them of the recommended standards-of-care, including appliance therapy in place of or in combination with CPAP therapy. 

Some patients self-refer to me, as friends and family talk about their experiences in my office, but I am not spending money on digital advertising to bring in dental sleep medicine patients. Mostly, they are referred to me by physicians, dentists, and other patients.  This is the same for my dental practice. 

As mentioned in a previous part of this series, our hygienists have attended dental sleep medicine courses with me and screen for airway issues. They adeptly educate and guide patients who have signs and symptoms to schedule an examination and consultation with me. 

Note: When patients are referred to me for dental sleep medicine, I never encourage them to become dental patients in our practice. This is a choice they might make but I am extremely careful to refer patients referred by a dentist back to their referring dentist for all dental needs. I am an adjunct to help other dentists’ patients fulfill a prescription for a dental appliance. 

If a patient comes in for sleep-disordered breathing but is also experiencing facial pain or TMD, I understand that this patient’s two issues are likely connected and I will not be able to successfully treat one without treating the other. This is an opportunity to communicate in depth with the referring dentists and let them know I plan to treat the patient for both issues simultaneously. This has been easier for me to do because I have had years of experience in treating facial pain and TMD issues in my dental practice, as well as sleep apnea and snoring. 

Restorative Notes on Bonding to Sclerotic Dentin and Removing All-Ceramic Crowns 

By Lee Ann Brady, DMD 

Bonding to Sclerotic Dentin 

Bonding to sclerotic dentin is difficult, if not close to impossible. If the lion’s share of the tooth’s surface is sclerotic, you may not have the longevity that you’re hoping for. I’m specifically thinking of some lower anterior restorative cases I’ve seen over the years, where the veneers just haven’t held up and we’ve had to go to full coverage. 

I don’t trust some of the self-etching adhesives to result in a strong bond on sclerotic dentin, even the newer ones in the eighth generation. Fortunately, one thing we don’t need to worry about is sensitivity because the dental tubules are closed. Since I’m not worried about sensitivity, I can apply the same techniques I would with enamel with the intent of improving the probability of a strong bond. I can do a light prep, get rid of the sclerotic surface, and etch it with phosphoric acid for 25 or 30 seconds. Alternatively, I can use 30- to 50-micron aluminum oxide in an abrasion unit.  

Removing All-Ceramic Crowns 

Removing dental crowns can be a delicate and time-consuming procedure. In a world of so many different materials, it’s helpful to have an idea of which bur to use and how long removing the crown could take. One of the biggest challenges is determining whether a crown is a lithium disilicate or zirconia restoration. The radiograph and visual inspection will give us clues but afterwards, we must go through a process to understand what may be involved. 

Our First Clue: Zirconia looks like metal on a radiograph, and lithium disilicate looks radiolucent like natural tooth structure.   

Our Second Clue: If the crown is partial coverage, it’s much more likely to be bonded and I plan to prep down the entire restoration.  

Lithium disilicate restorations are often easier to cut through or section but they could be bonded and impossible to remove in pieces. Even if we can cut four pieces, we may have extensive prepping to do.  

On the other hand, zirconia can be harder to cut through, especially the 3y or 4y variety. But at least once you get to the cement layer, you can normally break it into pieces and remove them instead of having to extensively prep the entire tooth.  

If the restoration is full coverage, I can easily remove it in sections. In this case, I attempt to make my cuts all the way from buccal to lingual across the occlusal surface without bothering to stop. At this stage, I can pick up a crown remover and apply some general pressure to crack it off. If the crown is not budging at all, I assume it is bonded to the tooth, and the next thing I do is pick up a big flat-top diamond to do my occlusal reduction as if I were prepping a natural tooth. Once all the occlusal is off the glass, the pieces on the buccal, lingual, and interproximal fall off. 

The goal of treating severely worn teeth is to extend the life and function of the teeth while improving their function and aesthetics. For the patient’s optimal comfort and health, we seek to achieve a stable posterior occlusion and efficient anterior guidance.

This article is written for the purpose of inspiring dentists to learn indicators for using this technique, and the no-prep “index technique” of diagnosing and restoring worn teeth with composite restorations.

The Benefits of the Index Technique

Conservation of the natural tooth structure—Whenever possible, dentistry should be additive, not subtractive-additive. The adhesion of composite resin is now so reliable that retentive cavity preparations are not always necessary. The digital index technique protocol proposes a conservative and alternative approach based mainly on minimally or noninvasive copy-and-paste composite restorations on both ante¬rior and posterior teeth. In anterior sextants with undercuts, a direct molding technique allows the clinician to be extremely conservative.

Simple repair—Another positive trait of this technique is the relative ease with which chipping or restorative failure can be managed by applying a simple adhesive protocol. Full loss or detachment of the restoration is an unlikely occurrence. Partial failure can be easily repaired with fresh composite following proper surface treatment: sandblasting, salinization, and bonding all surfaces.

Less clinical time and expense—This technique shortens the time to finalize a case. The technique requires a wax-up for planning the case and the fabrication of a transparent index but no other digital or analog lab expense. (See accompanying images above.) With this technique, you can avoid or postpone a more biologically invasive and financially costly solution.

Long-lasting aesthetics—Nano hybrid composite has good wear characteristics. Its superficial gloss lasts, and the composite can be easily repolished during patient re-calls.

Reversibility—With the index technique, you can remove the composite to restore the patient’s teeth to the occlusion they had before treatment if necessary. It should be noted that it is not easy to remove composite after adhesion due to bonding strength and composite chromatic integration with the natural tooth.

Join me for “Worn Dentition: Direct & Indirect Adhesive Management through a Non-Invasive Approach”

In October 2023, I will present an in-depth, two-day workshop at The Pankey Institute. During this workshop, you will learn the indications and protocols for diagnosing and treating severely worn dentition using the new direct “Index technique” approach. The course also will cover when and how to bond on worn dentition using additive partial indirect restorations (onlays/overlays) in composite and/or ceramic. The step-by-step protocols for digital and analog workflows will be addressed during the workshop through step by step images and videos on patients in order to understand this “hybrid approach”. I look forward to being back at the Institute, and I hope you will join me there!

The photos below refer to an INDIRECT additive adhesive ceramic cementation case:

while these photos refer to a DIRECT additive adhesive molding copy&paste protocol through the “Index Technique” protocol:

Not every tooth that has been endodontically treated requires a crown to insure it has great longevity and doesn’t crack or fracture.

Molars

Very clearly the literature supports that molar teeth in the posterior absolutely must have four cusp coverage—a four-cusp onlay or a full coverage crown. We are trying to use the phenomenon of containment with strong ceramic or metal material around the entire circumference of the tooth. We are holding the buccal and lingual together and replacing the top of the root chamber, so the tooth doesn’t fracture.

Bicuspids

Bicuspids that have been endodontically treated do not need two-cusp coverage if there have been no previous restorations and the endo access is very conservative. In the case of a premolar that has never had an MO, a DO, or an MOD, and has a tiny access hole, you can do a composite buildup or chamber retaining composite restoration. If the patient has high functional risk, a reasonable decision would be to restore the tooth with an onlay or crown

Anterior Teeth

There is no scientific support for doing a crown on an anterior tooth just because it has had endodontic therapy. We do a crown on an anterior tooth that has had endo when it is already structurally compromised, for example with previous mesial lingual and distal lingual composite fillings, missing tooth structure, and significant structural compromise between the endo access and other restorations.

Restorations are the foundation of a thriving dental practice because they keep you challenged and motivated while ensuring patient satisfaction. Indirect bonded anterior restorations provide patients with functional and aesthetic solutions to improve their smiles.

But “veneers” are more complicated than they seem when you see the finished product: bonded anterior restorations.

Before you decide on the type of restoration you are going to offer your patients in the anterior region, here are four questions you should be asking to get the most from your restorative process:

1. Can indirect bonded anterior restorations strengthen worn-down, eroded, or chipped teeth?
2. Should teeth be whitened before they are veneered?
3. Should endodontically treated teeth be veneered?
4. Are crowns stronger than veneers?

If you are hungry for more guidance on indirect bonded anterior restorations, check out my upcoming course at Pankey Online. On Friday, August 20th, 2021, from 2-4 pm ET, I will be hosting a live, 2-hour virtual course, “Indirect Bonded Anterior Restorations.” You can easily register for my course, which provides 2 CE credits, at Pankey Online.

Join me as we discuss useful concepts like three-dimensional functional and esthetic mock-ups, provisional fabrication, preparation design for adhesive restorations, and more. See you there!

The question of whether it is better to have a rough or smooth tooth preparation for indirect restorations pops up from time to time, and dentists relate to me they have heard conflicting opinions.

I go to the research literature to become better informed when questions arise, and this is one question research has answered convincingly for me.

What is the impact of texture on the predictability of your restorations?

When we think about the surface texture of a tooth preparation, there are two considerations.

1. How does the surface texture have an impact on bond strength or retention of an adhesively placed restoration? Do coarser surface textures on preps increase bond strength, or is it exactly the opposite?
2. How does the surface texture impact the accuracy of a VPS or Polyether impression and therefore the fit of the restoration?

It turns out that smoother is better.

If you go to the literature and look up the research studies in PubMed, you will find there is a high correlation between high bond strength and extremely smooth surface texture. To achieve an extremely smooth surface texture, multiple studies used carbide burs that are in the same shape that we use in doing crown and veneer preparations.

The other piece of the puzzle (the second consideration) has to do with the contact angle of VPS or Polyether impression materials and the tooth preparation. The smoother the preparation surface is, the more accurate the impression will be. The more accurate the impression is, the more accurate the die will be. And the more accurate the die is, the more accurate the fit of the final restoration will be.

So, in both categories, bond strength for adhesives and accuracy of physical impressions, smoother preps win over coarser preps.

All restorative materials have wear properties. We need to understand both how they wear and survive in the oral environment and how they impact opposing natural teeth.  

The wear of enamel is the basis for comparison.

Despite what we sometimes see clinically, enamel is highly resistant to wear (attrition and abrasion), with average annual wear rates of 30-40 microns. The range is from as low as 15 microns to as high as 100+ microns, and there is variability depending on the tooth position in the arch.  

Unlike enamel, which basically all has the same structure and properties, composites come in many different formulas. The chemical and physical properties of the material have a direct impact on its wear resistance and impact on other teeth. Some examples of this include: 

• Size, shape, and hardness of filler particles 
• Quality of the bond between filler particles and polymer matrix 
• Polymerization dynamics of the polymer 

These same properties affect the other physical and handling properties of the material and have to be balanced to create a composite that works clinically.  

Creating improvements in the physical properties of composites has eliminated the high degree of wear in non-contact areas we witnessed years ago. The loss of restorative material gave the appearance of fillings losing their shape and contour. Today our primary concern is in areas of direct occlusal contact.  

One approach might be to avoid using composite that has direct occlusal contact.

I would say this is not only not practical but not necessary. We have a variety of materials available today, with a range of handling and physical properties, and wear rates that are between 30-200 microns a year.  

We need to choose a composite based on things like wear versus polish–ability, anterior versus posterior, and the properties of the particular material we are using. In addition, we can manage the occlusion to maximize the success of the natural teeth as well as the composite. 

Both dentin and enamel can be worn down at a more than normal pace when exposed to very abrasive toothpastes.

We have learned that this damage is not being caused by the toothbrush, but the material being put on the toothbrush. As the desire to have whiter and whiter teeth has become popular, manufacturers have increased the abrasiveness of toothpaste to more effectively remove the external stains. In addition, tarter control and other newer versions of toothpaste designed to grab market share of consumers can also tend to be more abrasive. 

Ideally, we would like to be brushing with a material that has an RDA (relative dentin abrasiveness) of less than 80, but the FDA allows toothpaste to be sold with an RDA up to 200. The original Colgate toothpaste has an RDA in the 70’s. Most Sensodyne have RDA’s below 85, but several of the 2 & 1 tarter control and whitening have an RDA close to the maximum of 200. The abrasiveness can damage restorations, increase wear of exposed dentin and exacerbate sensitivity. At my Scottsdale, AZ practice, we keep a list of the most common toothpastes with their RDA, so we can discuss this with our patients. 

Prophy paste, even the fine, is generally more abrasive then over the counter toothpastes.

In addition, it is applied using a prophy cup going at 20,000 rpm’s with much more pressure. Even though the incidence is much less frequent, being 2 to 4 times per year instead of every day, this can still be a significant issue. 

A cool little experiment is to take some microscope slides and using your fingers rub prophy paste around on them and then rinse. Look at the slides with light behind them. You’ll be surprised to see a slide is scratched after just one application. This is the same thing that will happen to ceramic restorations. The glaze will be easily scratched. The surface of the crown or veneer will begin to deteriorate. 

Similarly, abrasive prophy paste will increase a patient’s sensitivity if used on exposed roots, accelerate the wear on exposed dentin or cementum, and can damage other restorative materials. The RDA of prophy paste can range from 150 for fine to up over 300 for coarse. Alternatives are to use products like Clinpro 5000 or MI Paste as a prophy product, both of which are low in abrasiveness. In my office, we use a product called Proxyt, from Ivoclar. It is a non-abrasive prophy product and is available in 3 grits and with and without fluoride. All three of the varieties have RDA’s between 7-83 and are safe to use on dentin, cementum, and ceramic. 

When we nose breathe, our tongue is elevated against the anterior portion of the palate and held there with gentle pressure. This position mechanically pulls the base of the tongue forward increasing the size of the airway. At the same time, the gentle pressure and movement of the tongue to this position helps to strengthen the tongue and keep it strong. A strong tongue is less likely to collapse backwards and obstruct the airway, so nose breathing is important for airway.

There is also great research today that breathing through your nose promotes better health. It creates higher levels of oxygenation of the blood, it cleans and humidifies the air for better lung health. Studies also show that mouth breathing suppresses the immune system and can have other adverse health effects. To this end, one of the current trends is to work with patients to train them to nose breath, including using a mouth taping technique.

A simpler way that may be effective is to use behavior modification and have people actively work on nose breathing. Many of the step tracking devices today can be set to vibrate every 15 minutes, to remind the person to move. I use this to remind people who parafunction to check if their teeth are touching, and for mouth breathers so they can check-in and nose breath instead.