UNC School of Dentistry Tour 5/24

I toured the UNC Adams School of Dentistry. I had the opportunity to practice my orthodontic skills on a fake mouth with some orthodontic instruments, which I was bad at. I also had the opportunity to observe a dental lab, where I observed how retainers and other 3D items in the dental world were created.

Day 3-9 Summary – Cary Family Dental

Day 3: Wednesday

The third day involved visiting a lot of patients with fillings (involving both cracks in the teeth and cavities). Additionally, I learned more about the sanitation process and its involvement with different kits (i.e., types of kits, the different tools needed in each kit, etc.)

I got to shadow a different doctor, Dr. Van Scoyoc – he is a periodontist that works intermittently with Cary Family Dental. Today’s patient was an individual with starting signs of gum disease and tooth loss. There was a deep cleaning involved, and I got to talk with Dr. Van Scoyoc’s dental assistant about her journey in specialized dentistry.

Fun fact: a periodontist is different from a dentist in that they are specialists in gums, not teeth!

I also was laughing for thirty minutes because I saw a box labelled “bagette” and it reminded me of bread “baguette” – for the life of me, I couldn’t imagine why Dr. Acton would need bread for surgery, but I was afraid to know the answer

Day 4: Thursday

Since Dr. Acton doesn’t work on Thursdays and Fridays, I instead followed Dr. Madden around for the day. I spent most of the day learning from her dental assistant about the more social side of dentistry, which I found to be really fascinating as it aligns with my interest in public health. We talked a lot about the estrangement between public health and general medicine and the importance of education within patients and in general, and I learned a lot about the difference in education between dental assistants, hygienists, and dentists.

Fun fact: dental assistants need an associates degree + training, hygienists only need an associates degree, and dentist need bachelors + dental school + residency!

We met a lot of patients, who I really enjoyed talking to – one of which was getting his teeth cleaned before his wedding on Monday!

I also got to take another look at Itero, and I saw an example of how Invisalign fixed a malocclusion (when teeth overlap).

I also thought the face model on the mask box looked like the Walmart version of Zac Efron, but no one in the office seemed to agree. :/

Day 5: Friday

The office was closed on Friday due to Memorial Day weekend (which worked well for me since I had a debate tournament), so I took some time to do an independent study on fillings, which I had seen a lot about. Here are my notes!

Fillings:

Composite fillings help the structure and integrity of the tooth after cavities, hold, grinding, and other activities break down the enamel.

  1. The teeth are polished and cleaned. 
  2. The tooth is numbed with anesthetic.
  3. Micro etch is applied to the tooth, and a waiting period follows. 
  4. The micro etch is rinsed off.
  5. Bond is applied to the tooth.
  6. The bond is cured with the LED light.
  7. Composite is applied that is tooth colored.
  8. The composite is cured with the LED light.
  9. The composite is polished and shaped.
  10. Floss is used to remove excess composite out from between the teeth.

Etch: an acidic substance that helps prepare the tooth for an adhesive by oepning up the enamel microscopically

Bond: a bonding agent that hardens and bonds with the etched surface of the tooth to prepare for the composite

Composite: a resin that is made to restore cracks and holes in the tooth

No dental pictures, but here is a photo of me and Maria headed to debate! 😀

Day 6: Monday

The office was still closed for Memorial Day, so I continued my independent study – this time on Invisalign/Itero and crowns. Here are my notes!

Crowns:

A crown is a type of covering placed on top of damaged and/or reshapened teeth. The crowns can be made of metal, resin, ceramic, and/or porcelain (?).

  1. The teeth is injured or damaged.
  2. The tooth is filed down to be made smaller. 
  3. An impression is made of the tooth with impression putty.
  4. The impression is sent to a lab to make the permanent crown. 
  5. In the meantime, a temporary crown is placed on the reshapen tooth.
  6. The temporary crown is removed when preparing for the permanent crown. 
  7. Anesthetic is administered to the area. 
  8. The permanent crown is affixed to the tooth and sealed permanently.

Invisalign and Itero

The Itero machine uses NIRI technology and CAD/CAM software to take 3d imaging of the teeth. The machine uses hundreds of pictures per second to capture a model of the teeth from all possible angles. The scan is then sent to Invisalign to print retainers, dentures, crowns, etc.

Still no more dental pictures, so here is a photo of me, Maria, and Ivy touring DC after the tournament!

Day 7: Tuesday

I was so happy to get back to the office on Tuesday! I reunited with Dr. Acton and the team and we continued to see more patients. Tuesday was probably my favorite day because I got to see two extractions and a bone graft for one of them! Extractions are simply what the sound like (the removal of a tooth that has dying nerves or is severely damaged in some other way), but bone grafts help the extracted are to develop bone structure again so that an implant can fit where the hole was. I loved the science behind the graft (the new bone cells from the graft and the old bone cells from the mouth fuse together and grow new bone), and it was really cool to see the whole process come together!

Fun fact: the bone graft material is usually made from the bones of cadavers! (it’s sanitized, of course, but that fact almost made me gag)

I think I definitely got more of a chance to bond with some of the patients, and I even got to talk with a gentleman who worked somewhere in medicine/public health about how dentistry is one of the most important medically informative fields out there.

Here’s a photo of me in my jacket after seeing the bone graft procedure!

I got the soul scared out of me when I ran upstairs to look for my water bottle – apparently it wasn’t important to mention that there was a legitimate life sized cut out of Dr. Acton just vibing in the corner, so I turned the corner and screeched, rightfully assuming he was a wizard and had come for my soul. Great day 😀

Day 8: Wednesday

Wednesday was another day, but unfortunately the last day, of following Dr. Acton around the office (since he wouldn’t be here on Thursday.) Today was probably my favorite day beyond the terms of dentistry, as there were a lot of rather apprehensive patients in the practice today. However, I got to witness Dr. Acton using education and science to explain to people why they shouldn’t be afraid to take care of their teeth, but also why dental health is important overall and what steps they could take to make the patient as comfortable as possible during the visit (extra topical anesthetic, neck pillow, TV as a distraction, and a blanket) (I was high-key kind of jealous of the blanket because my dentist would have never). I feel that all those interactions and more were definitely the reason why so many people like Dr. Acton – not only is he knowledgeable, but he’s understanding and willing to go the extra mile for every patient. It was super heartwarming to see, and I’m so glad I ended our internship on such an uplifting note.

On another heartwarming note, there was a staff meeting at the office and Dr. Acton brought his dog! Her name is Mazie, she is the light of my life, I would die for her, and I probably got caught around 30 times sneaking up to give her a quick hello before the next patient came into the office.

Itero machine after examining a patient with crowns who needed a partial denture

Mazie appreciation posts <3

 

Day 9: Thursday

Dr. Acton was gone for the week, so I continued to shadow Dr. Madden for the day! There was a lot of work with dentures today, along with partial dentures and bridges (a false tooth that is supported in the place of the missing tooth by crowns on the neighboring teeth). I got to talk with Dr. Madden’s dental assistant again today, and I also got to learn about the temping program within dental assistants and how the dental system works for traveling dental assistants.

We also took a lot of impressions, where I got to learn more about the different types of impressions and why it’s necessary to do impressions despite the presence of the Itero (the Itero has a very wide base to take pictures and some people have very small mouths – so, it’s easier to jus take an impression with smaller instruments, especially if you only need part of the mouth and not the whole mouth). Here are my notes for impressions!

Impressions:

Impressions are moldable solutions that are used to make accurate models of teeth and their structure. They are used for crowns, bridges, dentures, implants and probably teeth aligner trays (invisalign).

Light body: lower viscosity impression material – placed directly on the tooth to capture fine details

Heavy body: higher viscosity impression material – placed directly in the impression tray to support light body and capture impressions from the outer sides of the teeth

Retraction cords: pieces of string that are used when making an impression – inserted high in the margin between the tooth and the gums to create a clearer view of the teeth before the impression.

 

Thursday was definitely a very sentimental day – so many different people besides Dr. Acton helped me feel at home at Cary Family Dental, and I am so appreciative to have had the opportunity to exist and learn amongst all these important people.

To Dr. Acton and Cary Family Dental, thank you again for the amazing opportunity!

Day Two – Cary Family Dental and UNC-Chapel Hill Dental School

Today, after jaywalking at least four times, we drove down to UNC Chapel-Hill to see the Adams School of Dentistry. We met with the dean of the dental school, and he answered our questions about the school’s application process and learning environment.

Fun fact: the Adams School of Dentistry gets around 1400 applications every year, but the school only excepts less than 100 students every term!

picture: the outside of the dental school

We then met with an orthodontist who works with  the school, and she taught us about the inner workings of braces and how they connect with the health of the overall head. After an introduction to the terminology of braces, she taught us how to take off and add O-rings (rubber bands) to teeth that had fake brackets on them.

top picture: the orthodontist’s slideshow that explained the debonding procedure in dentistry

middle picture: me in my “scrubs”

bottom picture: my completed o-ring set that I almost lost a finger on 😀

We then had lunch with two students, Elizabeth and Harper, and they shared their experiences with the UNC dental program. We also met one of their professors during lunch, and he told us about the teaching regimen and the free dental care opportunities the school provides for the community. Elizabeth and Harper then took us on a tour of the campus, where we got to see the clinics where the students tend to patients. (we weren’t allowed to take pictures of the clinic)

top picture: the inside of the Adams School of Dentistry

bottom picture: me and Priyanka because I panicked and thought I forgot to take pictures

After the tour ended, I went back to the office, where I got to shadow a periodontist, Dr. Van Scoyoc. He was treating a woman who’s gums grew around her dental implant – so, Dr. Van Scoyoc underwent the surgery to cut open her gums, remove the implant, and insert a screw port to prevent the gums form growing around the space again. Today was super exciting!

 

Day 2

I had a very busy and exciting day today. In the morning, I had the amazing opportunity to tour the UNC Dental School with Dr. Mac and four other students doing dentistry related work experiences. My favorite part was doing the SIM lab with orthodontist, Dr. Frazier, where we got to put the rubber bands on fake sets of teeth! It was so cool to be doing hands-on activities. We got to ask lots of questions to an admissions worker and got to eat lunch and go on a tour with current dental students. It was so amazing getting to see what their lives are like and the amazing facilities they get to learn in.

hallway of unc dental building

The second half of my day I was back in Dr. Siegel’s office. Once again, it was very busy. The most interesting part was seeing not one, but two patients get numbing shots in their gums with pretty big needles. They both were getting cavities filled so they needed numbed gums to not feeling the drilling. It was pretty scary looking but Dr. Siegel was very reassuring to the patients the whole time which made me feel better. We ended the day with some charting which is very important to see because patients’ charts need to be correctly updated for the next time they come in.

Day One – Cary Family Dental

Today I started shadowing Dr. Allan Acton and his team during their day at the office.

First, I was stationed with the lovely sanitation hygienist, where I learned about the procedures for hygiene trays, the meaning sanitization-wise for the color coding system, and the uses of the tools and machinery that are cleaned or used for cleaning.

Fun fact: the sterilizing agent, Cavicide, is so potent that it can’t be used without gloves because it can cause cancer over time!

top picture: sanitization machines and tray dismantling station

bottom picture: sterile trays labeled for each hygienist (over 45 made per day; one per patient)

Next, I followed Dr. Acton to some of his patients. While I (obviously) could not assist with the appointments, I was lucky enough to witness 3 incredible procedures: the insertion of a temporary tooth, the filling of an interproximal cavity (a cavity found between the teeth), and an emergency composite filling for a cracked tooth. (Due to HIPPA laws, I can’t take pictures of patients having their procedures.)

My favorite part was seeing the Itero machine, which is technology that was coined by Invisalign to help doctors scan full 3D models of the patients teeth through camera, which are then sent to the Invisalign company for dentures and retainers.

picture: Itero machine being used to scan a patient’s teeth 

Finally, I met with Dr. Acton privately where we looked over before and after photos of transformed smiles, where I learned about the different types of crown, veneers, the structure of a tooth, and how acidity affects overall oral health.

picture: before photo of decay/what I believe to be gingival hyperplasia (overgrowth of the gums) and after photo from treatment and veneers

I concluded my day by walking through the tornado warning and slipping in a nice, cold puddle in front of the practice’s door – can’t wait for tomorrow!

Maris James – Cary Family Dental

Hi!

Starting this upcoming Monday, I will be shadowing Dr. Acton and his team at Cary Family Dental, a dental practice that has been operating in Cary NC for almost 20 years. I am beyond ecstatic to work alongside this team for the next two weeks – counting down the hours until the week starts! 😁

Day 8- The Final Frontier

As I write this a little bit of sadness looms over me as I realize that today was my last day at the office as an intern rather than a patient. Today was not particularly action packed but it was a nice ending to my time there because I got to see several patients walk out completely satisfied with smiles on their faces.
Buried in all of the routine cleanings I observed today my first case of a full set of wisdom teeth. I have seen various patients who had some or no wisdom teeth. I have slash seen patients who had wisdom teeth that were peeking through the gums in various ways and at various angles. The case I saw today was a case with all four wisdom teeth so Dr. Sims took a panoramic x-ray to see if the teeth needed to be removed. The x-ray revealed that the teeth were not currently effecting any of the other teeth in a negative manner. And although the teeth had no negative effects at this moment, Dr. Sims informed the patient that she should probably have them removed to prevent any pockets in the mouth where cavities could form. Other than the wisdom teeth in the patient’s mouth, this patient had the most perfect set of teeth that I have seen (even better than the patient yesterday!). There was not a single cavity or dark spot or crack throughout the patient’s mouth nor was there any sticky areas or discoloration. This patient came today with other family members and all of them had spotless teeth, and I was amazed at the genetics that this family had.
Before today I have seen multiple impressions be taken, whether it be for an implant or for a crown I have watched impressions be taken for all four quadrants of the mouth. Today I watched one impression and it was for a specific brand of implant. Three impressions were taken, one of the upper teeth, one of the lower, and one of the bite. I found the impressions for both the lower teeth and the bite to be interesting. The lower impression was interesting because two separate materials are used to make the impression. A thick layer is placed all over the teeth and a thin layer is placed directly over the part where the implant is. This thin layer molds into the thick layer, but because it is thin it dries in a more detailed shape to allow better precision when the implant is being made in the lab. The bite impression is also interesting because rather than it being placed into a piece of plastic and then into the mouth, it is placed directly on the teeth and molds into the bite mark in less than 15 seconds. The ease with which impressions are possible amaze me and I think what the lab is able to do with these simple impressions is amazing as well.
I would also like to shortly discuss something that I have been learning about ever since my first day at the office but I have not taken time to discuss yet: patient and doctor interaction. Dr. Sims is extremely personable and welcoming, and this is evident throughout his office. He knows every patient that walks into the office and he is always interested in what is happening in his patient’s lives. I think that this contributes to the professional relationship that is established between patient and doctor in an extremely positive manner. I have been extremely impressed with the interactions between Dr. Sims and his other employees and his patients. Within his office it is almost as if there is a small village of people who all know and help each other. This small business vibe is something that I think is extremely important in trusting health professionals and Dr. Sims is extremely successful in running a business that is strongly geared towards family.
I am so thankful for my time at Sims Family Dentistry, and I know that I learned things about dentistry and about the workplace that no textbook could ever teach me. I am glad I will be able to carry with me not only a small bit of knowledge about dentistry, but also a lot of knowledge of interacting with people. Thank you Sims Family Dentistry for being so welcoming and helpful in my journey of learning about dentistry!

PS- The radio came back on today, so it lives!!! 🙂

Saying goodbye to my scrubs 🙁

Day 7- All about Fillings

Besides routine cleanings today, all the other patients were there for fillings. I got to witness fillings in various places on teeth, and see how older fillings made of certain material eventually chip or cause other problems.
Some patients have older fillings that are made of silver. Silver fillings, especially in the back teeth can cause cracks in the tooth because the repetitive movement of chewing and biting causes the silver to move down and out within the tooth. This movement causes horizontal cracks in the tooth, which can then indirectly reach one of the four corners of a tooth and cause an entire corner to chip off (see diagram below that illustrates this cracking process). When this happens the entire silver filling must be replaced, and then the part of the tooth that chipped away must also be filled. Dr. Sims replaces and fixes these fillings with composite fillings rather than silver because this material will generally last longer and not chip and it also has a more aesthetically pleasing appearance.

The orange area represents the original silver filling, and the two black lines represent cracks created from the silver expanding. The dotted purple line is the crack that sequentially occurs to the corner point of the tooth, which causes that entire quadrant (marked in green) to break off. The parts in both orange and green are where the tooth must be refilled.

Today I also got to see a patient who has a filling in the same spot in all but about 8 teeth. After numbing the patient Dr. Sims took me to review the patient’s x-rays. These x-rays along with the patient’s chart obviously showed that there was a reoccurring pattern the patient was following to cause these cavities to happen. Dr. Sims informed me that this problem was in fact a constant usage of drugs. Dr. Sims explained to me that this continued use of drugs caused. The small cavities at the base of almost all of his teeth were caused by continued drug use, and the majority of these fillings have been reopened and refilled numerous times. This problem will persist and without the stopping of drug usage and without proper hygiene care these cavities will continue to happen. Out of all the cavity fillings I have seen, these were the first where an extra step was required in filling them. Because these cavities are located directly next to the gum line, a coated piece of string is temporarily placed between the tooth and the gum line. This string is coated in a layer of chemical that attempt to prevent the gums from bleeding (out of irritation) during the filling. The string’s main use however is to push back the gum to provide more space to fill the cavity and to ensure that the entirety of the cavity is filled as well. This tiny string was removed from the patient’s gums as soon as the filling was complete, but I was intrigued by the level of ease with which the gums swallowed the string and then put them right back out when the procedure was finished. This patient only had three cavities filled today and still has several that need to be filled, and will need to be treated in the near future.

Here I attempted to draw the front upper teeth in the mouth. The red circles mark the location of the cavities which were on almost every tooth in this patient’s mouth. Their proximity to the gums can be understood through this sketch.

In other news today besides all of the fillings I witnessed, I was able to watch Dr. Sims provide a patient with a new crown for one of his front teeth. This patient has crowns all across his upper mouth, and also has a partial on either side of his lower mouth. Last week I saw this same patient receive a crown that was not the right color match. So, to see the lab change the color of the crown was quite interesting to me as I got to see the difference it can make in a patient’s mouth when the crown has a color or shape change.
The final patient that I saw today had the most beautiful set of teeth that I have witnessed up to this point in the office. This patient was just in the office for a routine check-up and cleaning, and I was astonished at how perfect her teeth were. This patient is a 21 year old female and on her chart she had not a single cavity anywhere throughout her mouth or anything that would be considered bad. I was able to look at her x-rays and I thought it was amazing that she was able to not have a cavity all of this time.
Today I saw both the very best, and the very worst set of teeth that I have seen so far at the office. Dr. Sims placed fillings in several teeth in several locations throughout the mouth, and it was interesting to me that although all the treatments were for fillings, different materials and tools were needed for each respective filling, depending on where the tooth was throughout the mouth. Besides my learning about dentistry today, I witnessed something slightly tragic at the office. The trusty radio that has been continuously providing background music throughout the office ever since the office opened has been only receiving some signal and the sound has been going in and out since I have been in the office. And today, I believe we might have seen the end of the old trusty radio. I am sad that tomorrow is my last day working at the office, and I am sad that there will be no music to go along with it, but I hope that tomorrow is the best day yet!

Day 6- Orthodontics

As I mentioned last week Sims Family Dentistry is closed on Tuesdays. So today, I will not be going into the office and I decided to focus my research for the day on something that delves a little deeper into the world of dentistry: orthodontics.
Orthodontics requires the same knowledge of the mouth and skull that is required for dentistry, but to a deeper extent. An orthodontist must complete dental school and receive the same degree that a dentist would receive, but they must also complete three to five years more of specialized training regarding specifics of how teeth move and how teeth movement and the bite can be changed. This specialized training involves several exams throughout the time period to ensure that a student has a wide knowledge of the topics they are being tested on. Students pursuing orthodontic certification are also presented with several cases and are to discuss how they would treat these certain cases and a time frame for the treatment. All of this may not seem like much but the schooling is quite rigorous and only 6% of dental school students progress forward and become orthodontists.
This 11 years of college (4 undergrad, 4 in dental school, 3 in orthodontic study) comes with a somewhat hefty price, but pays off when a starting orthodontist receives their salary. Orthodontists who own their own practice can also decide their own hours and many of them, like dentists, are only open four days a week and they sometimes practice at several locations. The salary is dependent on the geographical location where the orthodontist works, much. Like any other job, but in my opinion the salary they receive is much worth the education required to get there.
A few short years ago, I finished my time in the orthodontist’s chair. I had two sets of braces, a retainer, three oral surgeries and it took around 6 years, but it was all worth it. Orthodontists have to work with people, mostly children, every day and interact socially with both them and their parents. Along with understanding what it is like to be a patient in the orthodontic experience, I also love interacting with people and I have a passion for children.
These past few days I have seen a few kids in the office who had braces. I have been able to witness their treatment from the dentistry side of it all and understand why they have difficulty in cleaning their teeth along with why they have frequent and slight bleeding in their gums. I have found that the way orthodontics effects the oral cavity and the bite of someone’s teeth is quite interesting and I think that it is important to have braces because from what I have seen in several patients is that it can prohibit certain problems from occurring in the future.
Orthodontics seem interesting, and I find it interesting how closely they relate with oral hygiene and the problems a dentist deals with on a daily basis. I am interested in hopefully seeing more kids in the office this week with braces, even though that is not my primary focus. After today it will be goodbye orthodontics, and hello again to dentistry!

 

A model of the oral cavity with braces. These are used to explain to children and their parents proper hygiene with braces.

Photo Citation: “Youtube.” Youtube, m.youtube.com/watch?v=4Wp37UanAOs.

Day 5- Moving Monday

Today was a bit of a hectic Monday, with patient after patient coming in and out of the doors. Many of today’s appointments whether they were routine cleanings or other cases, went by quickly and today was absolutely problem or challenge free. And although many of the appointments passed by quickly, there were two appointments in particular that I found interesting.
The first interesting appointment was a sort of precursor appointment for a patient who will soon be treated with a root canal. While this patient did not receive a root canal today, what Dr. Sims did was basically clean out the canals and the tooth overall in general so that it would be ready for the root canal. Dr. Sims took several x-rays in between completing several measurements in order to identify how deep the roots of the tooth were (where the empty canals are now located). Dr. Sims placed a medicine within the canals once he measured how deep they were in order to completely rid the canals of all bacteria prior to the actual procedure. After the appointment Dr. Sims noted that this patient walked in and out with much ease because the specific tooth being worked on was completely dead so that made it easier to work with for this particular operation. Obviously, it has been assumed that the tooth was dead because the patient is on the verge of receiving a root canal, but this tooth had no bleeding whatsoever when operated on today, and that is rare in the sense that the tooth was completely dead. This patient will now be allowed time for the medicine within the canals to do its job before the root canal in a few weeks.
The other most interesting appointment today was with a patient who will soon be receiving a metal partial for her lower right mouth. Today’s appointment only consisted of taking several impressions for the partial, but the appointment was interesting because it was the first partial that I had been exposed to that would not be a normal plastic partial but rather made of metal. The patient did not mind that it would be made from metal because she originally had a metal bridge in the area, but due to a tooth decaying the bridge failed, so a partial was suggested instead. The decayed tooth was removed at a prior appointment and today I was surprised at how well the gum had healed in the area where the tooth was removed. Anyways, the impressions were taken so that her partial can be custom made and fit properly within the patients mouth and a 3D mold of the patient’s teeth was made into office today to be sent off to the lab. What was also interesting about this patient was that I was able to learn what a Nesbit partial is. While this is not the type of partial she was taking impressions for today, the patient has one lower tooth missing on the opposite side of her mouth and Dr. Sims explained to me that the Nesbit partial would be the best fit for her because of the other dental work she has already endured. A Nesbit partial is a partial that hooks to other teeth, but it small and only has one actual tooth. I found it interesting that I was able to learn about two other types of partials that I have not yet seen in action.
The final news I have about today is not about a particular patient but rather a new piece of equipment Dr. Sims received information about. Dr. Sims showed me a new panoramic x-ray machine that not only takes the 2D picture scan but also creates a 3D model of the skull, places the nerves throughout the mouth along with their respective measurements, and can identify other measurements throughout the mouth. This would be particularly helpful in placing implants because it would give more information about each particular patient since all patients have different bone structures and their nerves are in various places. Dr. Sims told me that if he were to purchase this machine it would be likely that he would place more implants than he does now because he would be able to do that more precisely.
After learning about more types of partials that I did not know existed along with watching an impression turn into a 3D model, I thought today’s busy day was a great learning experience. I am looking forward to share my own research that I encounter tomorrow.

The impression I mentioned above coming to life to create a 3D model of the lower oral cavity.
What the 3D model will look like once it dries. This model is the same patient but not with the impression from today.
The blue impression is to match the bite of the mouth and the cream colored impression is the one that will form the 3D model.
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