Dental Software – Eaglesoft – Dental Practice Management

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60 01 361 D 33292 D 3329.201.03.01.02 08.2004

Contents

� Contents1 Preparations .................................................................................................................. 3

Preparation of the model ............................................................................................................... 3WaxUp set-up gage....................................................................................................................... 3Determining the insertion axis of the scanned object .................................................................... 4

2 Preparing a wax model ................................................................................................. 5Designing the framework in wax.................................................................................................... 5Maximum millable dimensions....................................................................................................... 5Attaching to the scan holder .......................................................................................................... 6Powdering the inner surfaces of the framework ............................................................................ 6Insertion in the CEREC inLab milling unit...................................................................................... 7

3 Editing WaxUp in the CEREC inLab 3D program ....................................................... 8Scanning the object ....................................................................................................................... 8Defining the insertion axis on the screen....................................................................................... 9Drawing the bottom line ................................................................................................................. 9Editing and checking the restoration............................................................................................ 10Milling the restoration................................................................................................................... 10Recommended minimum wall thicknesses and connector surfaces ........................................... 11

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1 Preparations

Preparation of the model

Prepare the master model so that the preparation margin is visible from all sides (removal of the marginal gingival junction).

WaxUp set-up gage

The WaxUp set-up gage helps you position the WaxUp model on the scan holder. It comprises the fol-lowing parts:

� A: Scan holder

� B: Gages for determining the position and maximum size

� C: Waxup gage for parallelometer

Fig. 1-1

Fig. 1-2

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1 Preparations

Determining the insertion axis of the scanned object

Determine the common insertion axis of the scanned object in a parallelometer.

CAUTION Make sure that, especially in the mesial <–> distal align-ment, no undercuts are present. This is important since they cannot be corrected later on.

CAUTION Do NOT change this setting during the following work!

Fig. 1-3

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2 Preparing a wax model

Designing the framework in wax

1. Apply the insulation.

2. Prepare the restoration on the saw-cut model:

� from scannable wax (ScanWax)

� from a wax of your choosing (powdering is then abso-lutely necessary).

NOTE �For powdering, we recommend using e.g. Scanliquid/Scanspray from Dentaco.

Maximum millable dimensions The maximum millable dimensions of the objects amount to:

Fig. 2-1 Applying the insulation

Fig. 2-2 Individual waxing

Block Size in mm, length x width x height

In-Ceram 38 x 14.5 x 13.5

YZ cubes 30 x 11.4 x 10.6

YZ flip block 40 x 15 x 12.5

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2 Preparing a wax model

Attaching to the scan holder

To attach the object to the WaxUp scan holder adjust the waxup gage to the model in the parallelometer.

When waxing up the object, if possible the position should be selected so that the edges of the crowns are optimally parallel and run at the same level as the edge of the plexiglass gage (A, Fig. 2-4).

The object should always be located as close as possi-ble to the cervical edge on the support. This process serves to align the object for optimal scannability. Every-thing the scanner cannot read also cannot be milled. Special attention should here be paid to the mesial-distal alignment. In the lingual-buccal alignment, the object is also scanned in a 45-degree scan position during the scanning process. In this regard, slight corrections can be made in the CEREC inLab program later on.

Powdering the inner surfaces of the framework

We recommend powdering the inner surfaces of the frameworks to achieve a better scan result, even when using Sirona ScanWax. If you do not use any Sirona ScanWax, the entire object must be powdered

Auxiliary materials recommended for enhanced scan-ning contrast:

� Scan film fluid (Dentaco)

� Scan spray (Dentaco)

� CEREC powder (VITA)

� ProCAD contrast powder (Ivoclar/Vivadent)

� ProCAD spray (Ivoclar/Vivadent)

Fig. 2-3

Fig. 2-4 Line parallel to edge of gage

A

Fig. 2-5

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Insertion in the CEREC inLab milling unit

1. Carefully remove the scanned object with the scan holder from the set-up gage by opening the knurled knob as far as possible and exerting a slight amount of pressure against the scan holder from the rear.

2. Insert the scan holder in the spindle so that the groove in the scan holder engages in the retention pin of the spindle.

3. Secure the scan holder with the setscrew.

Fig. 2-6

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3 Editing WaxUp in the CEREC inLab 3D program


Scanning the object

1. Select WaxUp in the New dialog box and enter your restoration data.

2. Click OK.

3. Start the scanning process.

The object is scanned.

You obtain 6 different scanned images:

� 3 occlusal images

� 3 basal images

Fig. 3-1

Fig. 3-2

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Defining the insertion axis on the screen

If have carefully defined the insertion axis of the scanned object in a parallelometer, only relatively small correc-tions should be necessary here. Still, it is necessary for you to see as much of the inner side walls of the scanned object as possible. Everything you cannot see also can-not be milled.

Drawing the bottom line

This step is required to enable the software to distinguish between the inner and the outer surface of the caps. That is important in order to ensure the following:

� that the spacer tool functions correctly,

� that, during automatic reinforcement of the wall thick-ness (WaxUp wall thickness) material is applied on-ly on the outside of the caps.

NOTE �Draw the bottom line displaced inward slightly in order to avoid influencing the fitting accuracy of the cervical edge with the spacer.

Fig. 3-3

Fig. 3-4

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Editing and checking the restoration

This step offers you the possibility of changing the object arbitrarily using the existing Design tools. While per-forming this step, you should also check the connector cross section with the Cut tool and correct it if necessary (see „Recommended minimum wall thicknesses and connector surfaces” on page 11).

Milling the restoration

1. Click the Mill icon.

2. Select the appropriate material.

3. Place the selected block in the milling unit and mill the object.

Fig. 3-5

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Recommended1 minimum wall thicknesses and connector surfaces2

The recommended minimum wall thicknesses (in mm) and connector cross sections (in mm2) are as follows:

1. The following recommendations were made by VITA as of: 23.01.20042. Connector surface:surface connecting abutment crown and bridge segment or abutment crown and free terminal segment

Material version/Indication

VITA In-Ceram SPINELL

VITA In-Ceram ALUMINA

VITA In-Ceram ZIRCONIA

VITA In-Ceram YZ

Incisal/occlusal wall thicknessSingle crown

0.7 0.7 0.7 0.7

Incisal/occlusal wall thicknessAbutment crowns of 3-part bridge framework

– 1.0 1.0 0.7

Incisal/occlusal wall thicknessAbutment crowns of 4-part bridge framework

– – – 1.0

Circular wall thicknessSingle crown

0.5 0.5 0.5 0.5

Circular wall thicknessAbutment crowns of 3-part bridge framework

– 0.7 0.7 0.5

Circular wall thicknessAbutment crowns of 4-part bridge framework

– – – 0.7

Connector surfaceFront tooth bridge, 3-part

– 9 9 7


– – – 9


– – 121 9


– – – 12

Connector surfacefor free-end bridge

_ _ _ 12

1 depends on span width

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Dental Software – Eaglesoft – Dental Practice Management