Pontics

13. Because glazed vacuum-fired porcelain is easy to keep clean, include the tissue-contacting surfaces of pontics in the veneering surface (Fig. 19-15).

14. To improve handling and stability of the wax pattern, be sure to cut back this area last (see Chapter 20).

Evaluation. Immediately before investing, the following criteria should have been met:

Oral Hygiene Measures

, : Fig. 19-14. Connectors should be located where they do not impede oral hygiene measures.

, : Fig. 19-14. Connectors should be located where they do not impede oral hygiene measures.

Fig. 19-15. The tissue contact on the pontics of this extensive fixed prosthesis was established in porcelain.

1. The pattern should conform to normal anatomic form. Centric stops should be located at least 1.5 mm from the porcelain-metal junction.

2. The angle between the veneering surface and the metal framework should be 90 degrees.

3. The internal surface of the veneering area should be smooth and rounded.

4. The collar height should be about 0.5 mm in wax with connectors of adequate size, but it should not impinge on the soft tissue in the in-terproximal areas.

5. Finally, the pattern should be smooth so that metal-finishing procedures will be minimized.

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