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Technical Instructions


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Pouring or press-packing a partial using ULTRAflex flexible composite resin

Information provided by Astron Dental Corp. Photos by Scott Ward, Ward Dental Laboratory.

ULTRAflex flexible partial resin denture material is formulated to simplify the fabrication of partial dentures utilizing conventional laboratory techniques. The non-methylmethacrylate composite can be processed with either conventional press packing or pouring techniques without the use of special equipment.

Following are step-by-step procedures for pouring or press-packing a partial denture. For either procedure, diatoric holes should be drilled in teeth to ensure optimum retention. The use of Astron bonding agent is suggested. Fig. 1 shows the right side of the wax-up before processing.

Fig. 1 Right side of wax up before processing.

Press-packing technique

1. Prepare denture mold using the flasking technique (Fig 2).

Fig. 2 Flex investment in flask. First pour before boil out.

2. Into the clear measuring cup pour 1/2-ounce of liquid resin; in the blue measuring cup add 1-ounce of powder. Note: ULTRAflex powder and liquid resin should be stored in the refrigerator and removed just prior to mixing and pouring.

3. Combine liquid and powder in the mixing bowl and mix thoroughly. Pour the mixture into the denture mold (Figs. 3 and 4).

Fig. 3 After boil out, apply separator.

Fig. 4 Flex invested after boil out.

4. As soon as mix reaches a doughy state (5 to 8 minutes), pack into regular denture mold using press-packing procedures (Fig. 5).

Fig. 5 Flask in pressing unit.

5. Cure for two hours in 130F water.

6. Cool for 15 minutes under cold running tap water.

Pouring technique

1. Repeat press-packing technique steps 1 through 3.

4. Cure in a pressure pot as soon as possible at 130F and 20 psi for 45 minutes.

5. Remove the pour denture mold from the pressure pot and place under cold running tap water for 15 minutes before removing denture from pour mold.

Finish and Polish

After the initial steps for press-packing or pouring, finish and polish (Fig. 6).

Fig. 6 Finishing the partial.

Fig. 7 shows the right side of the finished partial on the model. 

Fig. 7 Finished partial on model.

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