Evaluating dimensional accuracy of denture bases with a modified comparator

Dimensional accuracy of upper complete denture bases: the effect of metallic flask closure methods

“…Measurements of less than 0.25 to 0.27 mm in the fit of the bases to the stone cast would appear to have little clinical significance. Tissue displacement of only 0.25 mm would be required to allow almost complete seating of a maxillary denture on the oral tissues 29 . However, it is important to consider other factors involved in the retention and stability of the denture, such as decreasing the thickness of the saliva film and reduction of the resilience of the gingival mucosa in the older patient.…”

“…The improvement in the denture base adaptation using the RSTS and FCS methods would be of clinical benefit. They may permit more complete seating of the denture on the oral tissue, independently of whether the oral tissue can compensate for any base inaccuracy 29 .…”

Effect of flask closure method and post‐pressing time on the upper denture base adaptation

“…Complete denture base adaptation is affected by linear shrinkage of the acrylic resin 1 , thermal shrinkage and flasking methods 2 and time‐temperature correlation during the polymerisation procedure 3 . Dimensional changes that result from the processing temperature 4 and those that occur after processing 5 critically affect the retention and stability of the denture 6 ; however, denture adaptation may be partially improved by water absorption 7 , resilience of the gingival mucosa 8 and the saliva film between the resin base and soft tissue 9 , in particular when associated with elderly people.…”

Effect of metallic flask closure and investment materials on the stability of the denture base resin

“…Denture base adaptation to the stone cast is not satisfactory, mainly in the midline regions of the central portion of the posterior border,4–9 and gap discrepancies in the adaptation are not easily corrected after complete denture processing 10. Denture base accuracy is also influenced by the types of PMMA polymers,5, 11, 12 depends upon the palate vault shape,13 stresses released,14–16 processing techniques of the dentures,17–24 and it is considered a critical and unresolved problem 25–31…”