Bonding Hydrocolloid Techniques

1. To use the Cohere Material, it must be liquefied at boiling for 6-10 minutes, then cooled to a storage temperature of 145-155° F (65°C) for a minimum of 10 minutes. Gingi-Pak recommends use of the new heater, the Dry Conditioner, which is programmed to heat, then store the material at the proper temperature for up to 5 days. A hydrocolloid water conditioner may also be utilized. Please note that Cohere material should not be boiled more than twice and it must always be cooled to a working temperature before use on the patient. Make certain that a sufficient amount of Cohere material is heated to accommodate the preparation. A 2.5cc syringe will accommodate a quadrant and a 5.0cc Syringe is enough for a full arch, when used with alginate as the tray material.

2. To prepare the syringe, remove the protective cap and check flow by ejecting a small amount with the syringe in an upright position.
FIGURE 2 AT RIGHT

3. Immediately push the needle onto the COHERE syringe with a twisting motion which will secure the luer lock. Note that the size 15 gauge has a larger diameter and will provide the greatest flow.
FIGURE 3 AT RIGHT

4. At the same time, have an auxiliary prepare the alginate tray with 10% to 15% extra water for slightly softer mix so there is less displacement of the COHERE syringe material.
FIGURE 4 AT RIGHT

5. Syringe COHERE material liberally around and into the sulcus and them completely cover the desired areas.
FIGURE 5 AT RIGHT

6. To avoid air bubbles in post impressions, insert needle to the upper most depth of the syringe while continuing to extrude COHERE, covering the entire tooth.
FIGURE 6 AT RIGHT

7. Immediately place tray in mouth. Seat with moderate pressure then hold tray in position. Do not allow patient to hold or bite down on tray.
FIGURE 7 AT RIGHT

8. When setting is complete (after two to three minutes), remove the tray with a SNAP. Do not use an air nozzle nor ease the impression out slowly.
FIGURE 8 AT RIGHT