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. 

Upstream Thinking in the Dental Practice 

Leigh Ann Faight, RDH 

In my years of working with dentists and teams, I have noticed that leaders tend to address what is directly in front of them. They are simply too busy to notice that the issues of today will likely be back tomorrow, and the next day and so on if they don’t find the root cause and build systems from there.  

My favorite book on this subject is Upstream by Dan Heath. I was so impressed by it that I named my dental coaching company Upstream Dental Practice Coaching. The idea of the book is to help us stop reacting to problems and instead look for ways to prevent them in the first place. 

In the book, Dan Heath recalls a quote from Paul Batalden: “Every system is perfectly designed to get the results it gets.” I love this quote; it is as exact as it is simple and begs the follow-up question: Are your systems working to get you the results you want? 

I’m not writing this with just dentists in mind. I recommend that all dental team members appraise together how well your systems are working and think about where the lack of systems is causing stress. As you meet as a team and pull back the layers of your processes, do you discover barriers that get in the way of moving upstream? As a team, you can intentionally rebuild your systems to remove the barriers and prevent them from rolling back into your stream. 

Fixed thinking gets in the way.  

As I coach, I see three behaviors that get in the way of improving the many systems operating in dental practices. 

Problem Blindness 

This is the belief that negative outcomes are natural and inevitable. We treat these problems like we treat the weather, as something out of our control. We normalize problems and even stop seeing them. Teams tell me, “That’s just how it is here.” This finite thinking is one of the first challenges we uncover when I work with teams on intentionally “going upstream.” 

Lack of Ownership 

If an issue arises and no one claims ownership for fixing it, the problem will persist. To really develop upstream thinking you need someone who will say, “Even though I did not create this problem, I will lead us to find a solution.” 

To create a culture where teams have ownership over decisions, leaders must trust the team to make decisions on behalf of the group. On the flip side, the team must choose to take charge of issues as they see them.  

Tunneling 

Tunneling is exactly like it sounds. You focus on short-sighted problems and have reactive thinking. You get stuck in a routine of short-term decision-making and are unable to move forward. You think, “I can’t deal with that right now.” 

The more problems you are juggling at once, the harder it is to solve them all. If you can’t solve problems systematically you will stay in an endless cycle of reaction, because tunneling begets more tunneling. Compound tunneling with stress and scarcity, and you get stuck. 

“Getting Unstuck” is the name of the game. 

You might want to take your team offsite for a day to talk about what isn’t working in your dental practice. What are the big problems they and you see? Talk about the common human responses of problem blindness, lack of ownership, and tunneling. Talk about upstream thinking and proclaim, “Today is the day we become unstuck.” 

In helping teams find ways to make their systems more successful, I have often found that small changes can make a big difference. If you add target metrics to your systems, “the team” will more likely see and remove barriers that have gotten in the way, redesign systems, and work as a united group to improve the outcomes.  

In the Pankey course held February 2024 — The Pankey Hygienist: Where Clinical & Behavioral Science Unite – The Pankey Institute, we focused on “the flow” of the hygiene-restorative partnership, leading patients toward higher comprehensive care, and getting clarity around the why and how of optimal behavioral and clinical methods. We took a critical look at the habits and assumptions we have developed. We applied upstream systems thinking with the goal of collaboratively achieving with our patients greater oral and systemic health.

What I Brought Back from Napa (and it wasn’t wine!) 

Robyn Reis, Dental Practice Coach 

A while back, I made a business trip to Napa Valley. I was enjoying lunch on the patio of the Ottimo Café which is attached to a shop featuring wines, gourmet provisions, and culinary tools. It was a lovely day, and I was out in the beautiful California sun by choice. A nearby covered area provided shade, and there were multiple diners inside the shop waiting for those shaded tables. 

The maître d’ had given me a choice of tables and made sure I was comfortable. The food, wine and service were excellent. 

A family of four wandered over and sat down at an empty table in the sun. One of the waiters approached them and must have told them there was a line inside because they got up and went into the building. A few minutes later, they came out escorted and sat with menus at the same table they had left. There was obviously a system in place and it was working. Not long after, the two children became unhappy sitting in the sun. 

Being a parent myself I empathized with the parents as they struggled to keep the kids entertained. The little boy put his shirt over his head to block the sun, and I watched the dad looking at the covered area to monitor those shaded tables. As people from the shaded area got up, the tables were cleared, and the maître d’ seated more people.  

There was a lag between one table being bussed and people being seated because in a flash, the family left their table and sat down at a shaded table. The maître d’ approached them again. The family was speaking a different language and the father was using hand gestures. Obviously, communication was difficult. Ultimately, the family remained seated at the shaded table. There was no doubt that “good” customer service for this family was out of balance with “good” customer service for the people inside waiting to be seated. 

It was fascinating to observe the maître d’ having a conversation with the waiter who had been serving the family. My guess is that he was saying something like, “Hey, stay alert to maintain the seating system.” The waiter only nodded. It reminded me of a dental practice where you may have a patient in the hygiene chair and think to yourself, “Oh, it’s a small filling. Let’s go ahead and take care of that today.” Unbeknownst to you, someone may have walked in the front door hoping to be seen, and the front office thinks the walk-in can be accommodated based on the schedule.  

In both situations, it’s best not to make assumptions and communicate, communicate, communicate! In the back, check with the front to see if that filling can be done now. In the front, check with the back to see if the walk-in can be accommodated now. And in the case of a scheduled patient waiting in reception, you don’t want to keep them waiting unless it is really unavoidable.  

Sometimes we’re going to disappoint someone, however, we want to plan our schedule so no one is left waiting. We’re not in the restaurant business where customers are willing to wait in line for a seat at our table. Despite a fine reputation, if you cannot see new patients within a reasonable timeframe, they are going to call elsewhere.  

Look at your own schedule and converse with your team. Do you have an adequate number of new patient appointments available? Are you allotting sufficient time for each type of procedure? How good is your back-to-front and front-to-back communication? Do you keep patients waiting? 

My meal and business trip were a success in Napa. And while I didn’t bring back any wine, I did bring back the importance of having systems in place to ensure a great experience for every patient at every visit.