A long-established method in denture processing for acrylic polymer is the closed-flask compression molding with heat activation in a water bath, for resin polymerization. Alternative methods to conventional compression-molding processing for denture bases have been developed to increase the adaptation of the denture bases and one such method is the injection-molding technique. There is disagreement as to which technique or material is superior in terms of adaptation accuracy.
Aims: The purpose of this study was to evaluate and compare the adaptation accuracy amongst maxillary denture bases processed by using two compression molded and two injection molded heat cure acrylic resin materials.
Methods and Material: A total of 40 denture bases were fabricated over 40 dental stone casts using a standard metal denture base to maintain the uniform thickness. Twenty denture bases were processed by compression molding 10 using SR Triplex Hot and 10 using Lucitone 199. Another twenty denture bases were processed by injection molding, 10 using SR Ivocap and 10 using Lucitone 199 with success injection system. The denture bases were sectioned at three different areas and the gap between the cast and the denture base was measured using stereo microscope at five different areas namely the right and left vestibule, right and left crest and the midline.
Statistical analysis used: SPSS software package for windows (Ver. 19.0 SPSS Inc. IBM Corp). Comparison of data was made using student independent t- test with significance level of p ≤ 0.001.
Results: The injection molded denture bases displayed better adaptation compared to compression molded denture bases. Within the compression molded resins both materials did not exhibit significant difference in adaptation. Within the injection molded resins the SR Ivocap system showed better adaptation than Lucitone 199 injected with success system. When compression and injection molded Lucitone 199 was compared the injection molded Lucitone 199 showed better adaptation.
Conclusions: The results of the study indicated that the dimensional change which occurred in the denture base was influenced by the resin packing method. From a clinical point of view, there seems to be little advantage of injection molding over compression molding. A relatively better fit of the denture base may be helpful in reducing the initial adaptation period of the denture wearer.
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