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Creating Your Own Dental Morphology Library

Medit Orthodontic Simulation application allows you to segment out individual teeth from patient scans into an stl format that you can use as a template for smile design wax-ups. You have to watch the vide for it to make sense

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Export individual morphology
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The Digital 3D Shade Guide

3d-shade-guide-instructions

We’ve digitized the Vita 3D shade guide to help with color identification.  The same Medit scanner was used to scan the tabs and then this digital file was created. the assumption is that the same camera and light will hit natural dentition and the net effect will be the same.  Use at your own risk.

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3D Shade Guide

DOWNLOAD THE 3D Shade Guide

i think this can work!

i scanned the vita 3d shade guide with the same light i would use to scan teeth. Start with matching the value, then the hue, and then chroma.

*** correction made

Posted by Armen Mirzayan on Wednesday, August 18, 2021

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Measuring Intra-Oral Scanner Accuracy and How Accurate is the Medit Scanner?

Still not a single article published that says Medit ios is a good scanner ! its just been user driven for 3 years now.

 

it’s a good thing, because the world just changed. it is irresponsible to extrapolate research done outside the mouth on stone models or impressions into clinical significance with intra-oral scanning. There are parameters that are impossible to quantify like focal distance throughout the scan (unlike desktop scanners with known focal distances), the codes use to do the algorithms, the scan patterns, and also how light is treated by enamel, dentin, and restored materials.

 

i can’t believe people still use terms like trueness and accuracy when they really don’t even exist when you scan intra-orally. Like analog impressions, it is impossible to judge digital impression accuracy LIVE while it is happening.

 

Enter Medit! There are a few distinct ways to demonstrate an accurate scan live while it is happening. One way is to import a geometric shape that doesn’t alter its form while models are being rendered. That’s what’s demonstrated here. To my knowledge no one has ever studied this approach because no other camera lets you do this. i did see some publications where the authors attached objects like radiographic markers and after it was processed, they could measure that object and see if it distorted or not, but nothing at this level.

 

You can download the case and design along

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Medit’s Model Builder and Ortho Simulation Apps and the American Board of Orthodontics Electronic Cast Radiograph Evaluation (CRE)

The following information is from the The American Board of Orthodontics. We preview how the Medit Ortho Simulation and Model Builder can satisfy their criteria

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AOB Standards and Medit
abo-model-analysis-02-23-2021
grading-system-casts-radiographs
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Preview of Medit Compare Used in Merging Models, Modifying Them, Inverting Them, and Relating Them to Each Other with Medit Compare

This case shows how to relate models to each and maintain their relationships. It features the power of the Medit Compare app that lets you duplicate models, trim them, modify them to your liking. There are some very useful features in this app that can come in very handy
an important matter to remember is the “direction of travel” which is taking models from the Target folder and moving it to relate it to the Reference folder.
All models placed in each folder will maintain their relationships to each other when traveling to connect with the other models. Inverting models will also come in handy for advanced users. You can see the full video and download the case and design along here
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Duplicating Overdentures with Medit Compare
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Scanbody Search in Meditlink Software

To use the Artificial Implant Suprastructure Identification Software to identify a scanbody, you have to understand how it is listed in the library.  It is not listed by the name of the implant company but rather the manufacturer that fabricates that implant lines scanbody.  For example, there are multiple choices for Nobel Active Conical Connection scanbodies.  The easiest way to find them is to search for the pre-loaded brands, but be aware of the routing abbreviations many companies utilize.  For Nobel Active, usually NB AC is used.

Then you must choose whether you are going to fabricate a Ti-Base or a Custom Abutment, and whether you are using  an intra-oral or extra oral scanbody.  The connection type (diameter) and the material (titanium vs. chrome cobalt) also must be selected.  Here’s a quick video that illustrates the selection process.  You must also consider if a 10 or 14 mm diameter blank is going to be used to mill the product.  In molar areas, a size 14 is preferred so that you can reach the outer most boundaries of your desired margins, whereas a 10 mm blank may be too narrow and small for a molar.

For more detailed videos visit the Implantology Section of our Online Tutorials

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Search for Scan Body
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New Overdenture Fabrication from Previous Worn and Broken Overdenture by Medit IOS


A fracture and worn overdenture greater than 10 years old was duplicated digitally where the lab was able to follow the vertical dimension and tooth position from digital impressions taken by the Medit i500. Clinically, we advise that you place the housings before taking the impressions to accommodate enough space for the chairside reline. In this particular case, most of the reline and imaging was done extra-orally

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Perfect Fit and Occlusion
 

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Managing a Crown with a Pair of Class 2 Adjacent Restorations in a Single Visit

We have an MO a DO on adjacent teeth that need to be done and a crown in between. It took only 90 minutes to do all 3. I prepped the crown and got that milling and while it was milling I restored the adjacent teeth. I then tried the crown in. what’s great about lithium disilicate vs zirconia chairside is that I can easily add a contact on with powder while its crystalizing. or I can adjust the composites to nail the contacts. so we leverage mill time and oven time with prep time. Said another way, it takes me the exact same amount of time to do a crown + 2 class two’s as it does to do a single crown

 

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2 Fillings and Crown in a Single Appointment
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Easy Scan of DistoBuccal Area of Upper Second Molar

In this video we demonstrate how to use the color extraction feature of the Medit i500 scanner to displace and ignore the pesky tissue and the coronoid process that are annoying you while you try and image the distobucall area of an upper second molar

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How to displace the coronoid process
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Add Live Scans To 3D Models From Any Source

With Medit i500, there is an incredible feature where you can import a 3D model from source, even another scanner and be able to add live scans to that model. This is a first in the dental industry and has great impact for advanced users who utilize multiple models.

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Add Live Scans to 3D Model
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Translucent Enamel Is A MotherDoctor For All Intra-Oral Scanners And Their Accuracy

One of the most important lessons a digital dentist has to learn quickly is how to not introduce errors when scanning dentition.  The most likely area when s/he can introduce errors is in the anterior area where the incisor are not only narrower than molars but can also have translucent enamel.  Add just a little spacing between teeth with diastemas and you can quickly distort the accuracy of the model.  This is true of ALL intra-oral scanners in the market

There are a few ways you can overcome these issues and the second video highlights some of our preferred methods. The concept is easy- block the light from travelling through the tooth structure and you are set!  Watch the videos to learn how to do it

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The Problem With Light Travelling Through Enamel and Intra-Oral Scanners

Here are some examples of how light shinning through the enamel and /or ceramic instead of bouncing back resulting in errors in model accuracy. Lesson #1 for every ios user is to know when and where they are likely to introduce error. in dentate cases, it usually is right that the transition from premolar to canine to lateral. The surface area decreases dramatically and if you have translucent enamel and / or material and / or highly reflective surfaces you can “derail” the model building. Here is an exaggerated demonstration

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Same Issue May Arise While Scanning Translucent Ceramic and/or Shinny Surfaces

Translucent enamel can also play a role in distorting the cavosurface margins of a inlay or onlay restoration.  When imaging from the occlusal, the gingiva below the margins acts as a barrier to block light transmission through the enamel, but as soon as you start to roll the camera to the buccal or lingual, and you have enamel with no substrate behind it to block light transmission, you can introduce errors in the equation with any scanner.

There are many ways to combat this which include powdering the tooth structure, using a rubber dam, or in Medit’s case, you can use the color subtraction filter.  You selectively tell  the scanner to ignore certain colors and you use that exact color (here, it is the color of the glove) to block light transmission through the enamel. So the software just ignores the blue, but the light is prevented from shining through reducing the errors you would introduce.

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Translucent Enamel in Class 2 Preparations
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Tips About Filling Out Rx Form for CAD Program From Meditlink

For advanced users of meditlink software, you can skip filling out the Rx form and go straight into scanning.  But make sure to properly fill out the CAD Rx form so that all the necessary models are imported into the design software.  If you don’t designate the opposing or the Pre-op / Wax-Up in the form, they will not be part of the design equation.  Also, this video shows how to select multiple restorations at once.

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Filing Out Rx Form for CAD
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Align Occlusal Plane in Medit iScan Imaging Software- Why You Should Use It!

Setting the occlusal plane in the native medit software will allow for much nicer initial proposals in the CAD software

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Align the Model with the Occlusal Plane
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A Mix of All of the Medit Features Include Compare, Smile Design, Model Imports, CT scans, Image, Videos, etc…

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Compare and Smile Design Features

in this case we import multiple models, videos, CT scans, and Face Scans so that our users can utilize all of these features. Click here to enter the member’s section to download the whole case and design along

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How Medit’s AI Killed The Tibase Scanbody Star!

here is a list of why the Medit Artificial Intelligent Implant Suprastructure Identification System is significantly more advantageous over all other cadcam systems.

  1.  It s technically a crown and bridge case and the implant location or timing does not matter
  2. You can find margins outside the mouth!  See the first video to appreciate the significance of this
  3. You don’t have to deal with retraction or hemostatis at all
  4.  You don’t have to worry about sprue position. Many other systems force the placement of the sprue to a specific location often making the case more difficult to manage than necessary
  5.  you are not limited to just a few implant lines
  6.  you don’t have to worry about location of anti rotational notch
  7.  you can digitally alter the prep and get a virtual reduction coping in cad
  8.  Use any restorative block you want.  There is no need to order special blocks with pre-fabricated access channels and keep a large inventory of many colors. Your regular block inventory will suffice.  Just make sure the top of the tibase is wider than the diameter of the drill used to mill out the intaglio.  Also, the CAM and the milling machine determine the exact product and different settings maybe utilized to give you relief off the walls.  Some will even remove the antirotational notch because the adaptation is so tight, the restoration will not rotate due to the tall walls of the tibase
  9.  You can check the fit outside the mouth on the same tibase or a one you keep chairside for every case to let you know that if you are not seating, it is clearly a contact or contour issue as opposed to an intaglio issue.

 

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Digital Tibase - Medit's AI Feature

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Fit of Tibase to Milled Restoration

With Medit’s Crown Fit function, you can see exactly how much cement is required to seat the restoration and how well it is adapted to the tibase.

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Medit Crown Fit
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Chairside Milling of Lithium Disilicate with Meditlink 2.3 and Medit Scan

This article features the new Meditlink 2.3 software which has some advanced functionality.  One of the greatest achievements is he ability to tell the scanner to avoid imaging certain colors like green and blue.  This greatly facilitates the imaging of full arches as you can let your gloves / fingers guide the camera and displace all the soft tissue that impedes image capturing.  We also feature how easy it is to launch CAD software to design the restoration and mill it out of lithium disilicate material

Case set up:  here we enter the patients name and a simple tab appears where we chose the material and restoration tab. Once you image, you can place an order to the lab or you can advance to the CAD tab:

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Setting up a case in Meditlink 2.3

After the Rx has been filled out, you can launch the Medit Scan and image the upper and lower arches. Please note how we tell the camera to avoid the color blue and it ignores the clinicians fingers during imaging. The upper jaw and lower jaw were captured, then the bite registration even before the preparation was finished.  This allows the verification of proper reduction and space for the ceramic material

Lower Arch Scan

The lower arch is the most difficult area to scan as you frequently have to battle the tongue, saliva, and the lips. The optragate can be of great help but notice how we use the color filter to hide the blue gloves while we advance the camera.  It is a great aid in facilitating the capture of the lower arch

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Scan of Lower Arch

Upper Arch Scan

The same principle is applied to the upper arch. Notice that the software does not care if you start with the upper or lower arch. Here, you can visualize how the blue glove was used to displace the cheek and capture the pre-op condition of the upper second molar. The rest of the arch was easily imaged. It is not necessary to capture full arch impressions and this was done just for demonstration purposes. For a single unit case, generally imaging distal from the canine is adequate.

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scan of upper jaw (pre-op) in just a minute

 

Checkingthe reduction and aquiiring the bite registration

We recommend that you capture the bite before you finish imaging the preparation. This gives you one last chance to verify that you have reduced enough to accommodate material thickness.  You can see how we just take regular photos to document the lack of clearance and we continue to adjust the height of the preparation until we achieve the required space. We then activate the imaging process and capture the occlusal relationship between the upper jaw and the lower jaw

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Always check reduction before taking final bite

 

Image the preparation and place margin in native MeditScan Software that transfers to CAD Software

The preop condition is then transferred to the arch model and the tooth in question is cropped out. The rest of the arch is protected so no extra data is added unnecessarily to the equation.  This protect feature is used for demonstration purposes and is subsequently removed. The prep in question is then highlighted and the local area is processed and the margins are placed.  This margin line can be sent to the lab or it can be automatically carried to the design software

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image prep and place margin

Launch CAD Software

The Meditlink software allow you to launch a variety of CAD programs that include 3shape, exocad, cerec, etc… Here we launch exocad which automatically imports and aligns the models and marks the margins. The restoration is then designed to completion.

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Easy launch to CAD software

Design of restoration

The CAD software allows you or the lab  to alter the marked margins if necessary. The restoration is aligned in the arch for and the contacts are adapted to the adjacents and the oppising

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Quick launch of CAD software and Design

You can take the designed restoration to ANY milling machine or printer

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Print it if you want

Milling of Lithium Disilicate with Imes Icore Coritec One

The final restoration design can be exported as an stl and taken to a variety of mills or printers.  Here we designed it millbox and milled with the coritec One.  The material used was Amber Mill and it was crystalized and seated

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Amber Mill Size 12 block for molar crown mill

Post-op X-ray

Final X-ray was taken to verify the fit and to make sure no excess resin was left behind

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Checking for Excess Resing Cement
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Prep Sequence for Easy Access

The following pictures depict the sequence of burs we recommend that you use to finish a preparation quickly. While patient is getting numb, take a quick look at the clearance you will need to reach proper material thickness. Once the quadrant is isolated with isolite and optragate, take an occlusal router bur and create a trough to gain the proper depth. Follow that with a flat disk, and you can quickly reduce the occlusal height.

A shoulder bur of .8 mm thickness can help you reduce the interproximal areas as well as the buccal and lingual margin lines. Before finishing the prep, place hemostatic agent like expasyl in the sulcus and place retraction cord. while it is setting, check your reduction. If you need more space, now is the time to reduce some more.

Once you have adequate clearance, retraction, and hemostatis, you can readily image and find your margins in the CAD software

 

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Prep Sequence for Easy Access
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Ed McLaren Performing Gingivectomy and SmileDesign from Medit Intra-Oral Scan

A Medit i500 scan was taken and merged with a CT scan and the distance to bone was measured (5.5 mm’s) giving enough space for soft tissue contouring with a diode laser.  The 3D X-ray must be captured with cotton rolls placed in the vestibule so that you can differentiate between the gingiva and the lip.  Ideally you should not close the base of the digital model by the intra-oral scanner as it can make the merge of the data sets more difficult than it needs to be.

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Diode Laser Used for Contouring

Comparison of Pre-Op Scan and Post Gingivectomy Scan with Medit i500

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Comparisson of Tissue Position