📖 How to Design Restorations Using Pre-Op Data (Eggshell) > Bridges

Medit Temporaries allows you to create eggshell-type bridges based on the preparation data alone.

 

1. Register several crowns or crowns and pontics in the form, connect them, and run Medit Temporaries.

 

2. After the app has opened, select the pre-op data module and assign your scan data. Then, click “Confirm.”

 

3. Once data has appeared on the screen, follow the instructions in Guide Message.

 

4. Utilize Selection Tools to select the teeth you want to create a bridge for.

Smart Single Tooth Selection is automatically enabled once you enter this step. Click and drag on the tooth to select; the selected tooth data will be green.

To work on the next tooth, click its number in the list below the 3D data or use the arrow keys.

 

Selection Tools

	Smart Single Tooth Selection	Automatically select the area of a single tooth, leaving out gingiva parts. Click and drag the mouse on the tooth.
	Brush Selection	Use a brush to select all entities on a freehand drawn path on the screen.
	Brush Deselection	Use a brush to deselect all entities on a freehand drawn path on the screen.
	Clear All Selection	Clear all selected areas.

 

Check the Quick Settings located at the top right corner of the screen before moving to the next step. If your bridge includes pontic, choose between ovate or saddle in this step.

Using Quick Settings helps shorten the time spent on manually editing the restoration.

	Fit to Antagonists	Use this option to cut all intersections of the restoration with its antagonist. The default value for this parameter is 0.2 mm. You can make more precise adjustments later in the Advanced Edit Mode by entering a different value.
	Fit to Adjacents	Use this option to fit the outer surface to the adjacents. This will help to expand the restoration so that the space between the crown and adjacents is minimized.
	Margin Width	Thin Margin: Choose this option to create a restoration with a thin margin line (0.2 mm). Go to Advanced Edit Mode to access more inner surface parameters. Thick Margin: Choose this option to create a restoration with a thick margin line (0.5 mm). Go to Advanced Edit Mode to access more inner surface parameters.
	Pontic Types	Ovate: Create a pontic with a convex surface that resides in the gingiva. Saddle: Create a pontic with a concave surface that overlaps the gingiva buccolingually.
	Pontic’s Distance to Gingiva	Set desired value for the pontic’s distance to the gingiva.

 

To better understand the difference between using a thin or thick option of the Margin Width, compare the two images below.

 

5. Click “Next” or press the space bar when done to continue.

 

6. In the next step, the margin lines will be automatically created for all your target teeth. Examine margins and, if needed, edit them.

 

Add, move, or delete control points to edit the margin. Left-click to add points, right-click to delete, and click and drag to move.

 

Use the slider at the bottom of the screen to quickly expand or shrink the margin evenly in all directions. Note that by default, the program will create a slightly bigger margin line. To apply this change to all teeth, select “All” in the list below the 3D data.

 

7. Click “Next” or press the space bar to see the created bridge.

 

8. Use Sculpting Tools to design the outer surfaces of the bridge. Turn on contact features in the Viewing Tools to assist you when sculpting.

 

When sculpting, adjust the transparency slider of each crown in Data Tree or click them to completely hide the restoration. This will improve the visibility and access when designing the mesial and distal sides.

<Tooth #11 is hidden and tooth #12 is transparent.>

 

Sculpting Tools (Check more hotkeys for sculpting by clicking the question mark; provided hotkeys help to save up time when sculpting.)

	Add	Add material to the restoration. Hotkey: 1
	Remove	Remove material from the restoration. Hotkey: 2.
	Smooth	Smooth parts of the restoration. Hotkey: 3
	Morph	Morph the material on the restoration by dragging it with your mouse. Hotkey: 4

 

9. Finish creating the bridge by adjusting connectors. Turn on the Connector Editor on the right and drag the center point of each connector to change its position.

The minimum cross-sectional area for connectors can be set in program settings. The default value is 9 mm² for anterior teeth and 14 mm² for posterior teeth.

 

If there are parts of the restoration that are too thin, they will be displayed in blue. Turn on Sculpting Tools and edit them before finishing.

 

10. If satisfied with the result, save the bridge to Medit Link by clicking “Complete” in the bottom right corner.

 

11. If you want to make more advanced edits to the restoration’s inner and outer surfaces, click “Advanced Edit Mode” in the bottom right corner of step 8.

 

A) Edit the outer surface of each crown separately by performing the adaptation with tools provided in the outer surface tab of the Editing Tools.

 

To edit the pontic, turn on Pontic Editor and adjust it to the gingiva.

 

Editing Tools (Outer Surface)

	Adapt to Adjacents	Adapt the restoration to adjacents.
	Adapt to Antagonists	Adapt the restoration to antagonists.
	Smart Adaptation	Adapt the restoration to the antagonists and adjacents simultaneously based on our recommended parameters.

 

B) Edit the inner surfaces by adjusting the insertion path arrows and values for the parameters provided in the inner surface tab of the Editing Tools. Adjust the insertion path by moving the arrow for each crown separately, or turn on Bridge Insertion Path so the arrows would move as one. You can also use Set Arrow to Your Viewpoint to quickly set the insertion direction to your viewpoint.

<The gray arrow indicates the automatically set insertion direction; the blue arrow is the newly set insertion direction.>

 

To adjust inner surface parameters for all teeth at once, click “All” in the list below the 3D data.

 

In the pre-op data module, you can adjust the following parameters for the inner surface of the crowns.