One of the primary goals of new materials and processes for complete denture fabrication has been to reduce polymerization shrinkage. The introduction of computer-aided design and computeraided manufacturing (CAD/CAM) technology into complete denture fabrication has eliminated polymerization shrinkage in the definitive denture. The use of CAD/CAM record bases for complete denture fabrication can provide a better-fitting denture with fewer postprocessing occlusal errors. (J Prosthet Dent 2015;114:493-497)
The production of accurate record bases is an integral part of complete denture fabrication. According to Elder,1 record bases should adapt to the basal seat area as the finished denture base, have the same border form as the finished denture, be sufficiently rigid to withstand occlusal forces, be dimensionally stable, be fabricated so that they may be used as bases for setting up teeth, be able to be fabricated inexpensively, easily, and quickly, and have no undesirable color.
Processed record bases for complete denture fabrication have been advocated for their ability to provide benefits in the definitive prosthesis. Langer2 argued that the use of trial bases that failed to engage soft tissue undercuts and distribute pressure evenly over the entire load-bearing mucosa recorded errors that were incorporated into the final denture. He found that 75% of dentures fabricated from trial bases had occlusal errors of 0.1 to 0.7 mm, compared with dentures fabricated from processed record bases, of which only 10% had any occlusal error and only in the range of 0.1 to 0.2 mm. Jacob and Yen3 proposed processed record bases in the treatment of maxillofacial patients, finding improved retention and stability and fewer occlusal errors.
Processed bases also have the benefit of allowing the provider to check and adjust border extensions and intaglio surfaces over multiple appointments, potentially leading to fewer adjustments at the delivery of the final prosthesis. Other authors have contributed to the techniques of fabricating processed record bases, and many of their insights can be retained with this new material.4-6
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