WIELAND Dental Digital Support Milling arch models with Dental Wings

Transcription

1 D E N T A L WIELAND Dental Digital Support Milling arch models with Dental Wings

2 Table of contents 1. CAD à Dental Wings ModelBuilder Creating an order Editing an order Scanning Aligning the impression Aligning the dies Scan errors Importing a scan Importing a scan via the CAD application Importing a scan in the stand alone Model Builder application Model Builder Trimming the scan Adjusting the model Generating the model Setting the parameters for the model base Extracting dies Define preparation Defining the insertion axis Setting the stump parameters Model with opposing arch Adding an articulator system Saving the model Handling in the CAM system Importing a digital restoration file into the CAM system Setting the occlusal planes Central occlusal planes Upper occlusal plane and lower occlusal planes Defining the insertion directions Marking the fissures Nesting Computation and simulation... 21

3 Milling arch models 1. CAD à Dental Wings ModelBuilder (Scan impression with I-Series) 1.1 Creating an order Select the menu <<Create order>> Editing an order Click on <<OK>> to edit the dental arch Right click on a tooth to define a die as <<Single Coping>> Confirm the finished order by clicking on <<OK>>

4 1.2 Scanning Open the menu <<Scan>> Drag and drop the order onto the main view and click on <<OK>> to launch the scan Aligning the impression Use the mouse to position the impression, set points to limit the area and then confirm by clicking on the check mark

5 1.2.2 Aligning the dies Align the dies individually, label the individual dies with the correct tooth number and then click on the check mark to confirm Scan errors If any errors/holes are present in the scan, then these should be corrected before proceeding. Right click on Scan à <<Show scan errors>> Right click on Scan à <<Close scan errors>>

6 1.3 Importing a scan Importing a scan via the CAD application Once an order has been created, click on the <<Import scan>> button Drag and drop the order onto the main view. Go to <<Browser>>, select your intraoral scan and confirm by clicking on <<Open>>. Do the same for the antagonist scan.

7 Once the scans are selected, confirm by pressing <<OK>> To align the vertical axis, click on <<Yes>>, align the model and confirm by clicking on <<OK>>

8 Then use the points to adjust the curve of the arch and confirm by clicking on the check mark Finally, allocate the die and confirm by clicking on the check mark. The scan will now be passed on to the CAD application.

9 1.3.2 Importing a scan in the stand alone Model Builder application Launch the Model Builder, assign a project name and select <<Wieland Project>> as project type. Go to <<Select file>> (C), select the upper arch scan file as the upper arch scan and confirm by clicking on <<Open>> (D). Do the same for the lower arch scan file. (C) (D) Then click on <<OK>>. The scan will now be imported.

10 1.4 Model Builder Trimming the scan Select a tool for trimming the scan, set spline points around the area to be defined. Then right click on the background; the area will be highlighted in red. You now have two options: 1) Save the red area 2) Remove the red area

11 1.4.3 Adjusting the model Click on the model adjustment icon Use the points to align the model horizontally or according to the insertion axis and confirm by clicking on the check mark (C). (C) Generating the model Select <<Compute model>> to build up the model.

12 1.4.5 Setting the parameters for the model base Right click on the model à <<Recompute model>>, à set parameters and confirm by clicking on <<OK>> Extracting dies To extract dies, click on the die icon.

13 1.4.7 Define preparation Click on the margin around the tooth to generate the preparation. Select <<Projected>> ; this generates a proposed margin line for the preparation Defining the insertion axis Align the insertion axis from above and define the insertion axis by clicking on <<Set insertion axis>>. Check from the side that the PIN is not too sharply angled. Click on <<OK>> to confirm.

14 1.4.9 Setting the stump parameters Right click on the model à <<Recompute stump parameters>> à Set parameters. Then confirm by clicking on <<OK>>. 1.6 mm in CAD 0.8 mm in CAM NOTE ON SETTING PARAMETERS: Wieland PIN: Select this shape for the pins, since this ensures that that it corresponds to the tools. The adjustment parameters prep margin expansion, distance between hole and stump, stump slope and tool radius are predefined by Wieland. The pin diameter depends on the size of the stump and is defined thereby. The shape of the Wieland pin is oval. The CAD application defines the pin diameter according to the widest cross section of the oval pin. The diameter measured in the CAM system is based on the narrowest cross-section of the pin diameter. For example, a diameter of 1.6mm in the CAD application corresponds to a diameter of 0.8 in the CAM system. In view of the tools used, the diameter of the pin should not be less than 1.5 mm (CAM) in order to ensure that it is still possible for paths to overlap and that the insertion axes can be machined with a 1 mm tool.

15 As far as possible, the PIN numbering offset should be selected so that it does not intersect with the PIN numbering offset of the adjacent tooth. Any intersections in this area will result in artifacts in the CAM system. This in turn causes problems when defining the occlusal planes and insertion axes in the CAM system Model with opposing arch When an opposing arch is used, then the occlusion of the opposing arch must be adjusted. Right click on the model. à Select <<Adjust opposing arch>> and use the << + und - >> buttons t o adjust the opposing arch in the X, Y and Z axes. Then confirm by clicking on <<OK>>.

16 Adding an articulator system When using an opposing arch, an articulator can also be added to the model. Right click on the model or select the <<Add articulator>> icon in the right-hand tool bar. Select front or back and position on the model. When selecting the articulator, the parameters for the dimensions can also be adjusted Saving the model Click on the <<disk icon>> to save the model Save the model in the <<Wieland>> format. In the Wieland CAM 4.0 format the datum surfaces are automatically identified and do not have to be defined separately in the CAM system.

17 Enter a directory path and click on <<Export>> (C) 2. Handling in the CAM system 2.1 Importing a digital restoration file into the CAM system 2.2 Setting the occlusal planes When importing STL files, the occlusal planes and insertion axes must first be defined on the model and the fissure markings on the occlusal surfaces of the remaining teeth must be painted in. In the Wieland CAM 4.0 output format the occlusal planes and the insertion axes are already defined. It is only necessary to mark the occlusal surfaces of the remaining teeth. (C) Central occlusal planes Central occlusal planes are set in order to define the maximum milling depth to be traveled by the fine milling tool from above and below. Otherwise, tool breakage may occur because the tool would try to penetrate too far into the material. In the <<Preparation dialog>> select <<Insertion directions>> ; if no machine has been selected, you will first be prompted to select a machine. This is important because this defines the maximum tilt angle which is dependent on the machine. In the case of the T1, the tilt angle can then be set to 25. Then click on <<Center>> at the bottom of the pane (C), position the arrow on the edge where the occlusal plane is to be set. The edge must be highlighted in yellow (D). (D) (C)

18 2.2.2 Upper occlusal plane and lower occlusal planes Upper and lower occlusal planes are set in order to prevent the fine milling tool from traveling at full speed in the insertion directions during the first fine milling pass and thereby causing the tool to break. à Click on <<Lower>> and select edge in order to set the lower occlusal planes à Click on <<Upper>> and select edge in order to set the upper occlusal planes 2.3 Defining the insertion directions Insertion directions are set in order to carry out a separate fine milling operation at reduced feed. This ensures that the restoration will be a good fit. In the <<Preparation dialog>> select <<Insertion directions>> à click on "Manual Insertion directions" at the bottom of the pane, click on <<Select curve>> and position the arrow on the edge where the insertion direction is to be set. The edge must be highlighted in yellow. If the insertion direction is not correctly aligned, it must be corrected by means of the <<slider>>. The insertion direction should then be aligned so that it can be viewed directly from above without any visible tilting. Otherwise, the result may be a less than perfect fit.

19 Once the insertion direction has been correctly aligned, click on <<Insertion direction OK>> to define the insertion direction. Proceed as above for all other insertion directions.

20 The model is finished when all occlusal planes and insertion directions have been defined. Then click on <<Save>> in the top right of the tool bar to save the model.

21 2.4 Marking the fissures Because of the strategy defined, the occlusal surfaces must be painted. In the <<Preparation dialog>> select <<Painter>> and select << Fissure>> at the bottom of the pane. Paint all the occlusal surfaces of the remaining teeth in the model and in the case of models with articulators also paint the tips of the articulator aids in order to ensure accurate reproduction. Then click on <<Save>> (C) to save the model. (C)

22 2.5 Nesting Next, position the model and the respective dies on a blank. Move the model to the lower edge of the blank in Z. Press 1x and 1x The bottom of the blank is then also defined as the bottom of the model and does not need to be prepared by rough or fine grinding. Select a strategy The following strategies can be selected as standard strategies: Die model à Model_Direction + cut bars 5.4 Dies à Model_Stump + engraving + cut bars 5.1. Antagonist model without insertion direction à Model_Antagonist + engraving + cut bars 5.1 For even faster milling results, the following strategies can be used: Model_Direction FAST MILLING 5.2 à Die model Model_Antagonist FAST MILLING 5.2 à Antagonist model Depending on the geometry of the model, the die may be a very tight fit with FAST MILLING. In this case the dies would have to be adjusted manually.

23 2.5 Computation and simulation When computation is complete, the paths and the simulation should always be viewed since any errors can then be detected immediately, which can save a milling operation. You can tell by the paths whether all occlusal planes are correctly set or not. Central occlusal planes: Right click several times on the button <<Tooth>> in order to make the work transparent. Then click on the paths for the insertion directions. The paths for the insertion directions must not extend beyond the central occlusal plane. Upper and lower occlusal planes Click on the paths for the first rough milling operation. The paths must not penetrate as far as the areas of the insertion directions, either from above or from below.

24 Simulation It is recommended to always view the simulation before carrying out the milling operation, since this enables errors to be identified immediately and avoids unnecessary, unsuccessful milling processes. If any die holes remain partly unmilled, this can be due to two causes: 1) The paths for the insertion directions extend beyond the insertion direction. This is a sign that the tool is penetrating so far that the tool shank is colliding with the edge of the blank. This can be averted by expanding the milling area. Go back to "Nesting" à by right clicking on the job à, selecting <<Adjust milling area>> and use the slider to increase the height of the milling area. 2) If the insertion directions are correct but there the simulation reveals that enclosed pin holes are still present, it is possible that the pin diameter has been set too small in the CAD or that the pin has automatically been generated too small because the dies are too small. In such a case, the diameter of the tool used prevents the insertion direction from being milled.

25 D E N T A L EXPECT THE DIFFERENCE! BY WIELAND. As a major supplier of dental system solutions, WIELAND embodies both tradition and progress in matters of dental products and technology. Since our company was founded in 1871, we have stayed true to our corporate philosophy of combining tradition, innovation and quality with the best in customer care. Today, our core competencies and key strengths lie in the forward-looking integration of technologies and materials for dental prosthetics. This ensures that patients can trust in the quality of their restorations, and our partners in dental practices and laboratories can continue with confidence on the path to digitalisation and greater competitiveness. WIELAND offers a wide range of products and services from CAD/CAM technologies and dental alloys to veneering ceramics and electroforming. Thanks to our worldwide presence and international network, WIELAND is never far away, and your contact person can always be located via the Internet. WIELAND Dental +Technik GmbH & Co. KG Schwenninger Straße 13, Pforzheim, Germany Fon / , Fax / e.00.03/12