1. Make sure the Impression Elements are correctly embedded in the impression material. There should not be any material on the interfaces to the restorative platform.

Note: Ensure that the Impression Elements, embedded in the impression material, are components from the Cresco API™ Kits. Impression Elements from other brands are not always compatible with Cresco Replicas.

2. Attach one Replica to each embedded Impression Element using an Impression Pin and a slot screwdriver.

Note: It is important to work with Cresco Replicas from the Cresco API™ Kits as they have sufficient retentive qualities to withstand the forces they undergo during the precisioning process.

3. It is vital that only the Replica is handled when tightening it to the Impression Element. To avoid disturbing the Impression Element in the impression material, hold the Replica with a firm grip when tightening the Impression Pin to the Replica. 

After tightening the Replicas ensure that the Impression Elements are rigidly fixed in the impression material, both vertically and horizontally.

4. Isolate the impression. Make sure the isolating material does not affect the retentive surface of the Replicas. When the impression is isolated by spray, this should be done before the Replicas are attached.

5. Use a brush to apply the isolating material when the Replicas are attached to the Impression Elements before isolation take place. Pay careful attention in order to avoid getting material on the Replicas. 

Note: It is important to follow the handling procedures to ensure good stability for the replicas in the master model during the precisioning process.

6. Fabricate a removable soft-tissue mask. When the mask material has set, the removable soft-tissue mask can be trimmed to create a shape that can easily be removed.

7. Make sure that the soft-tissue mask covers half of the non-retentive surface of the Replicas. This is to ensure good stability during the precisioning process.

8. Pour high-quality stone material (type IV stone) into the impression tray. For the correct expansion of the stone material, follow the manufacturer’s instructions. It is important to use stone material that features smooth surfaces, excellent flow, low expansion, and an exact reproduction of fine details. 

Note: Follow the stone material manufacturer’s instructions to ensure the correct expansion of the stone material in the master model. The correct expansion of the stone material also ensures good stability for the Replicas in the master model during the precisioning process.

9. Unscrew the Impression Pins when the stone material has set. Lift the tray carefully away from the master model. 

Note: Make sure that the Impression Pins are completely disengaged from the Replicas before lifting the tray.

 10. Grind and finalise the master model. Grinding should not infringe on the length of the Replicas. At least 10 mm should be left intact laterally of the Replicas to ensure the strength of the master model during the precisioning process. 

A regular stone model should be made, avoiding the use of tray-based model systems. The master model should never be sectioned between the Replicas that are going to be used as a base for the same construction. If a section has to be made in order to separate remaining teeth, this should preferably be done after the precisioning process.

11. Ensure that the Replicas are firmly embedded in the finished master model.

12. The soft-tissue mask can be removed at your convenience to expose the working ends of the replicas and facilitate subsequent steps in the creation of a passive fit framework.

13. Finalise the master model. Retention grooves under the master model facilitates re-positioning in the articulator after the precisioning process. They also increase the stability of the connection between the master model and the stone material that fixes the master model and the opposing jaw model onto the Magnetic Discs used in the precisioning process.

Note: If the previous instructions have been followed, no more than half the non-retentive surface of the Replicas should now be exposed, ensuring the stability of the Replicas during precisioning. During subsequent steps, the soft-tissue mask should be replaced in position on the master model as an aid to assessing the relationship between the gingival borders and framework construction components.

14. Mount the master model and the opposing jaw model in the articulator to determine jaw relations and the spatial parameters available for the framework.