kinase inhibitor Dorsomorphin Note intaglio surfaces of the restoration are facing upwards to prevent trapping air bubbles Use a ligature wire (0.25 mm) attached to the surfaces to be coated to hang and stabilize the MCR on the hanging device (Gramm technic Gmbh, Ditzingen, Germany). Stabilize the MCR horizontally with the wire so that the intaglio is placed vertically and that gas bubbles will not be trapped inside the framework. Hang the hanging device (Gramm technic Gmbh, Ditzingen, Germany) in the gauging tool (Gramm technic Gmbh, Ditzingen, Germany) to verify correct distance to the anode [Figure 3]. Figure 3 Measurement of distance between plate and restoration attached to hanging device with gauging tool Use the contact check (Gramm technic Gmbh, Ditzingen, Germany) to verify if all metal surfaces of the MCR are properly connected with ligature wire (0.
25 mm) [Figure 4]. Figure 4 Evaluation of electrical contacts with contact check Use galvano-wax (Gramm technic Gmbh, Ditzingen, Germany) or insulation lacquer (Protection lacquer, Gramm technic Gmbh, Ditzingen, Germany) to isolate, and protect the surfaces which are not going to be coated with the GHP method [Figure 5]. Figure 5 Restoration surfaces isolated with Galvano wax Connect the MCR to the large plating head (Gramm technic Gmbh, Ditzingen, Germany) with the hanging device (Gramm technic Gmbh, Ditzingen, Germany). Determine the amount of gold solution (Gramm technic Gmbh, Ditzingen, Germany) required to gold-plate the surfaces, taking the manufacturer recommendations into consideration [Figure 6].
Figure 6 Restoration after gold-hard-plating Perform the GHP procedures in the electrolysis device following the manufacturer’s instructions (Gammat Optimo 2, Gramm technic Gmbh, Ditzingen, Germany). DISCUSSION There have been several studies reporting the long-term survival rates and success of MCRs. These reported restorations were mostly fabricated with noble alloys with the addition of base metal alloys for oxidation. Corrosion and the release of metal ions over time might have been responsible for reported discoloration and gingival problems.[10,11,12,13] This modified GHP technique for MCRs may minimize corrosion of base metals and the concomitant gray discoloration of the soft tissues. This technique can be modified in relation to the site to be coated. The outer, intaglio surfaces, as well as only metal bands of the MCRs can be coated with gold.
Livaditis and Tate investigated the effect of Gold-plating on cementation and esthetics of adhesive bridges. They recommended Gold-plating technique as a viable solution for reducing the discoloration problem that results from the framework in AV-951 etched-metal resin-bonded prostheses.[9] It has been observed that the number of clinical studies related with long-term success of Gold-plating technique is limited. According to Rogers,[7] the durability of the plating depends upon the hardness of the gold deposited and its thickness.