Visalys® CemCore from Kettenbach Dental is a dual-curing luting composite designed for safe and predictable cementation of all indirect restorations. This 2-in-1 product can also be used for fabricating core build-ups and build-up fillings. The unique, patented Active-Connect Technology eliminates typical conflicts and enables optimal mixing of the somewhat hydrophobic composite Visalys® CemCore with the hydrophilic Visalys® Tooth Primer on the damp tooth surface, resulting in a permanently high adhesive bond. Visalys® CemCore features excellent flow properties, is radiopaque, bisphenol-A-free, and ready to use.

The correct procedure for taking an alginate impression for an individual edentulous tray.

Determine the tray size based on the old denture. If in doubt, choose one tray size larger for the upper jaw and one tray size smaller for the lower jaw. For a large jaw, it is best to use a tray for a dentate jaw and apply yellow beeswax to the trigonea. Coat the trays with the appropriate adhesive and make the alginate stiff. If using Silginat® (an A-silicone) for the impression, first coat the trays with Panasil® adhesive.

It is important to note that a good individual tray can only be made thanks to a correct preliminary impression with alginate or Silginat® (scan-optimised A-silicone impression material). If trays are to be printed, it is preferable to make the preliminary impression with a scan-optimised impression material. For crown and bridge work, it is important that the tray is not too tight; in addition to blocking out undercuts, sufficient impression space (at least 4 to 5 mm) must also be created. Any inhibition layer on the plastic individual tray can interfere with the curing process of the impression material and must be thoroughly removed before use. After checking the fit, use the appropriate tray adhesive (also just over the edges). An adhesive only has a good adhesive effect once the adhesive layer is dry (after approximately 4 minutes).

• Select appropriate impression tray (stock or custom tray, perforated or solid), ensure proper size and fit.
• Apply adhesive 5 min before taking the impression. For Kettenbach Dental impression materials, we recommend our Universal Adhesive.
• Prepare the oral situation: Block out large undercut areas, expand the sulcus and control bleeding. For subgingival preparation margins, use retraction cords. If applicable, clean the prepared stumps.
• Prepare impression material: Bring material to room temperature. Mix homogeneously and fill the tray completely.
  On first use of a new cartridge, discard at least 3 cm of material. For hand-mixed putties, maintain a 1:1 ratio of catalyst to base material. Leave the mixing tip in the material when filling the tray to avoid bubbles. Do not use latex gloves or polyether “contaminated” accessories. Remove the inhibition layer from an individual tray before impression taking.
• Insert the filled impression tray into the patient’s mouth vertical to the occlusal plane while slowly applying pressure and hold in position.
  Do not fully depress the tray. Do not hand the impression tray over to others.
• After the material has completely set, remove the impression in the same direction as the tooth axis. Tilting the tray too much can cause permanent deformation.
• Rinse, dry and disinfect the impression.

General guidance: always follow the manufacturer’s instructions and the product IFU, and observe working and setting times. For more tips, consult our full troubleshooting guide.

Consider external factors that could affect the processing and curing of the impression material: These include temperature (warmer or colder than room temperature), use of latex gloves, a polyether “contaminated” impression syringe, and the inhibition layer (lubricant layer) of temporary restoration material left on the preparation. Furthermore, some retraction agents may have a negative effect on the curing of the impression material; we have not received any complaints about this with regard to Kettenbach impression materials for decades. For sufficient pressure with a medium and heavy body consistency, preferably use a closed impression tray. Ensure that it is coated with the correct tray adhesive; the adhesive must be dry before the tray is filled with impression material. With a customized impression tray, ensure sufficient space (4 to 5 mm) and remove any inhibition layer. Important: remove retraction cord or paste and any cotton rolls from the patient’s mouth just before taking the impression.

Begin the best preparation for printing by first determining the tray selection and individualising it if necessary. Coat the trays with adhesive before preparation; also just over the edges (adhesive must be dry for the adhesive effect). Prepare a partial tray so that, if desired, a second impression can be made immediately after removal. Due to the pressure during the first impression, there is a good chance that any bleeding will be under control. Prepare the mixing gun/syringe/device for use and set the timer to the desired total curing time. The practitioner and assistant should be ready to start spraying the preparation and filling the impression tray simultaneously.
Important: remove retraction cord or paste and any cotton rolls from the patient’s mouth just before taking the impression.