September 30th, 2008 by admin

The recording base is generally a temporary form that closely resembles the final base of the denture under construction.
It is used for recording maxillo-mandibular jaw relationship and for setting the artificial teeth.

It is accurate to fabricate accurate recording bases on the final casts if the casts exhibits no surface defects

In order to ensure an accurate final cast of superior quality each cast must be carefully examined and the decision made either to correct the defect or to remake the final impression

Afer correction of existing artifact, the final cast must be inspected for undercuts on the denture-bearing surface.
Undercuts whether caused by a bony alveolar process, by soft tissue or by bony tori must be relived with a suitable plastic material or with a wax.
Undercut must be adequately blocked out to permit the removable and replacement of the bases to prevent abrading or breaking the surface of the cast

In order for a recording base to adequately fulfil its role in the fabrication of dentures it must satisfy several criteria

The recording base must be as follows

Well adapted and accurately formed to final cast
Stable both on the cast and in the mouth
Free of voids on the surface that contacts the oral mucosa
Reduced to approximately a 1 mm thickness both over the crest and the facial slope of the ridge to prevent the base from interfering with the placement of the artificial teeth

Approximately 2 mm in the hard palate area of the maxillary base and the lingual flange of the mandibular base for rigidity
Easily removed from the cast
Smooth and rounded and must reproduced both the contours and dimensions of the reflections of the final cast
Fabricated from materials that are dimensionally stable