1.

Relate sections of the bridge with appropriate relating material. With short span bridgework, a bur luted across the incisal or occlusal surface may be sufficient to maintain the relationship, keeping wax or acrylic out of the joint area.

2.

Invest using casting investment instead of soldering investment. Mix only with water. After the appropriate set time, boil/steam off any wax. Pre-heat assembly in a burnout furnace. Heat from room temperature to 1000¼F (538¼C) at 30¼F/min. (17¼C/min.) holding for 20 minutes.

3.

Cut a piece of solder sufficiently large to fill the gap when melted. Lightly flux the solder and place it in the joint on the surface oppsite that which will be heated with the torch. Using a single orifice tipped torch with oxgen set at 3 psi and propane/gas at 1.5 psi. Adjust to obtain a flame with a soft light blue inner cone about 1.25" (32mm) long. The inner cone will not be bright blue. Flame the entire assembly until a dull red color is evident across the entire bridge. As the color increases in intensity, concentrate the flame in th earea of the joint but keep the flame moving in the area. When the flow temperature is reached the solder will quickly melt and flow through the joint.

4.

Allow the assembly to cool, divest, check fit and proceed with metal preparation.