WIELAND Dental Digital Support Milling arch models with 3Shape

Transcription

1 D E N T A L WIELAND Dental Digital Support Milling arch models with 3Shape

2 Table of contents 1. CAD 3Shape ScanItImpression Setting model parameters in the Control Panel Creating an order Importing a scan Scanning an impression Trimming the scan Aligning the scan Setting the preparation and insertion direction Model Saving the model Handling in the CAM Importing the digital restoration into the CAM 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...15

3 Milling arch models 1. CAD 3Shape ScanItImpression (Scan impression with D700) 1.1 Setting model parameters in the Control Panel Open the <<Control Panel>> Select the menu <<Digital model design>>

4 Click on <<Add>>, and in the "Name" column rename the parameters <<Wieland>> and define the Wieland parameters in accordance with Table (C). 3Shape Export Parameters (englisch) 3Shape Export Parameters (deutsch) Wieland Parameter Material Material Zenotec Model Gingival removal radius in Software nicht übersetzt 0,2 Base margin height in Software nicht übersetzt 0,13 Ditch height Extraktionshöhe 0,3 Ditch depth Extraktionstiefe 0,1 Standard Die Shape Standardstumpfform FALSE Base main height Haupthöhe der Basis 5 Base wall angle (degrees) Basiswandwinkel 2 Base stop surface width Flächenbreite des Basisstopps 0,001 Base stop surface angle in Software nicht übersetzt 0 Die to model spacing Abstand Stumpf zum Model 0,01 Friction Bar width Friktionsstegbreite 0 Friction bar overlap Friktionsstegüberlappung 0 Number of friction bars Anzahl Friktionsstege 0 Vertical Insert Direction Vertikale Einschubrichtung FALSE Pin type Pintyp PinCylindric Snap off Pin in Software nicht übersetzt FALSE Pin height Pinhöhe 2 Pin wall angle in Software nicht übersetzt 0 Pinless hole type Typ ohne Pin CADCylindricalBottomHole Side hole type in Software nicht übersetzt none Pushing indent type Eingedrückter Einschubtyp PinShapedPushingIndent (deutsch: Pin-förmige Einrückung) Pushing height Schiebhöhe 1 Use drill compensation Fräserkompensation verwenden FALSE Drill Radius Fräserradius 0,5 Minimum Model height in Software nicht übersetzt 4 Hollow model in Software nicht übersetzt FALSE Surface thickness Oberflächendicke 1,5 Use variable thickness Variable Stärke verwenden FALSE Hollow dies Hohlstümpfe FALSE Drain hole size Größe der Ablauföffnung 0 Use ID tag ID-Tag verwenden FALSE Font height in Software nicht übersetzt 2,5 Text depth Texttiefe (-0.500) Use connectors Verbinder verwenden WAHR Print layer thickness in Software nicht übersetzt 0.050mm Platforms Distance in Software nicht übersetzt 0 Friction adjustment for angle Anpassung für Stumpfwinkel 0 Friction adjustment for size Anpassung für Stumpfgröße 0 Ditch unsectioned model in Software nicht übersetzt FALSE (C)

5 1.2 Creating an order For a normal impression, select <<Impression>> under "Object type" or select <<Digital Impression>> for an intra-oral scan which has to be imported. Highlight the dies by clicking on them and select coping and <<S>> ("sectioned") for model (C). (C) Click on << + >> and select CAM 4.0 as the output format for the coping and the model. (The required occlusal planes and insertion directions for the CAM are already defined in the Wieland CAM 4.0 output format; these only need to be checked as necessary) For CAD settings" select the defined parameters <<Wieland>> for the model (C). Click on <<OK>> to confirm the order (D). (C) (D)

6 1.2 Importing a scan Right click on the order created and select <<Import Scan>>. Select <<Raw Preparation scan>> in the new window and click on <<Open>> to confirm (C). (C) A yellow exclamation mark is shown in front of the scan icon. To prepare the scan and design a model in the Model Builder, right click on the order and select <<Prepare scan>>. This launches the Model Builder. Proceed as described in Section

7 1.3 Scanning an impression In the Dental Manager, right click on the order to scan the model and follow the instructions: Left click to highlight the required die area and confirm by pressing <<Continue>>. When prompted to do so, highlight the area of interest and confirm by pressing <<Continue>>. Scan starts.

8 1.3.1 Trimming the scan Mark the area required by clicking to set spline points. Join the ends. This defines the spline. Press <<OK>> to confirm Aligning the scan Click on <<Set from view>>, adjust the insertion direction and press <<OK>> to confirm. Then click on <<Next>> (C) (C)

9 1.3.3 Setting the preparation and insertion direction Follow the prompts. Click on the required tooth. A margin line will be generated automatically. Left click, hold down the mouse button and drag the mouse to adjust the preparation. Confirm by pressing <<Next>> and repeat the operation for the next die. Once the preparations are defined, confirm by clicking on <<OK>> and then press <<Next>> to set the insertion directions.

10 If the insertion direction is not quite right, it can be adjusted by clicking on an individual tooth. Once the insertion directions are set, confirm by clicking on <<OK>> Model When all preps and insertion directions have been set, click on <<Next>> to continue. The model is generated automatically. In the case of models without occlusal arch, select the "Articulator" setting <<None>>. No articulator is required. Click on <<OK>> to confirm.

11 For models with an occlusal arch, select <<Simple Quadrant>> as articulator. The articulator will be added automatically. The position of the articulator can still be modified by clicking on the articulator traversing along the model margin. As <<Platform Distance>> always put in 32mm.The high correspond with the articulator high and the model base will be accordingly adjusted. This is necessary so that the models can fit in the articulator Saving the model Once the model is complete, click on the button <<Design>>. You will automatically be taken to the Dental Designer so that you can proceed with the restoration.

12 2. Handling in the CAM 2.1 Importing a digital restoration into the CAM system 2.2 Setting the occlusal planes When importing STL files, the occlusal planes and insertion directions 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 directions are already defined. It is only necessary to mark the occlusal surfaces of the remaining teeth 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) 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. Click on <<Lower>> and select edge in order to set the lower occlusal planes Click on <<Upper>> and select edge in order to set the upper occlusal planes

13 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>> 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.

14 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. 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.

15 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) 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:

16 Die model Model_Direction + cut bars 5.4 Dies Model_Stump + engraving + cut bars 5.1. Antagonist model without insertion direction Model_Antagonist + engraving + cut bars 5.1 For even faster milling results, the following strategies can be used: Model_Direction FAST MILLING 5.2 Die model Model_Antagonist FAST MILLING 5.2 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. Attention: After the milling with the 3Shape articulator there will be some scrap material which needs to remove by grinding manually when cut out the model.

17 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.

18 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" by right clicking on the job, 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.

19 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.01.08/12