Dimensional Accuracy of Acrylic Resin Maxillary Denture Base Polymerized by a New Injection Pressing Method

概要

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The purpose of this study was to confirm the dimensional accuracy of a newly developed injection pressing method for resin polymerization by making use of the internal electric resistance of resin to determine the optimal timing for resin injection. A new injection pressing polymerization pot with a built-in system to measure the internal electric resistance of resin was used for resin polymerization. Fluid-type resin was injected into the mold of a maxillary complete denture base under nine different conditions: three different timings for resin injection according to the electric resistance of resin dough (early stage: 11 MΩ; intermediate stage: 16 MO; final stage: 21 MΩ) and three different motor powers for resin injection (2000 N, 4000 N, and 6000 N). In the best polymerization condition (injected during the early stage of resin dough under a motor power of 6000 N) , the adaptation of the denture base showed a statistically significant improvement compared with the conventional pouring method.
日本歯科理工学会の論文