Abstract
Aims: The aims of this study are to compare the dimensional changes of record base from heat and
cold cured acrylic resin, with the latter cured by two techniques, and to study the regions vulnerable to
dimensional changes. Materials and Methods: The adaptation of the record base on edentulous maxillary
casts were tested by sectioning the record base–stone casts sets transversely and measuring the
gaps with travelling microscope. The gaps represent the crest of the ridge, midline, and the deepest
points of buccal sulcus. Results: Record base made from cold cured acrylic resin showed significantly
higher dimensional changes than that from heat curd acrylic resin. There were no significant difference
between the bench–curd and thermopress curing for cold cured acrylic resin. No significant differences
found between the ridge crest and midline , but both show significantly less dimensional changes than
the buccal vestibules. Conclusions: Curing cold cured acrylic resin by thermopress machine would not
improve dimensional stability. And to improve the dimensional stability, the denture base that is made
from heat cured acrylic resin may be used as a record base.
Keywords