The Evaluation of 3-Dimensional Polymerization Changes of a Denture Resin Utilizing Injection Molding with Water Bath Polymerization and Microwave Polymerization
Naval Postgraduate Dental School, Uniformed Services University of the Health Sciences Bethesda United States
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Objectives To compare the effect of microwave polymerization and conventional water bath polymerization on the three dimensional polymerization changes of Lucitone 199, a poly methyl methacrylate denture resin. Materials and Methods The study used a randomized observational design. Thirty SLA master dies, in the form of a maxillary denture base, were fabricated to include a sequence number 1-30 and a set of fiducial markers. The distance of the fiducial markings were recorded for each SLA master die using a contact scanning device FARO Gage arm. The SLA master dies were randomly assigned to one of two testing groups and sequencing numbers for each group were recorded in a log see 6.3.4. From the SLA master dies, 30 acrylic resin denture bases were fabricated. Half were polymerized by water bath and half by microwave. Following polymerization by the manufacturers instructions, all resin denture bases were retrieved from the denture flasks. The PI removed each resin denture base from the water, conducted a three-dimensional evaluation utilizing the FARO Gage arm and several fiducial markers against each record bases own SLA master die to determine three-dimensional polymerization changes. The data was analyzed by a multivariate analysis of variance MANOVA. Results MANOVA revealed no difference in the mean vectors simultaneously between the two groups. Differences in the mean vectors of the coordinate axes between polymerization methods were also noted. Conclusions The objective of this study is to determine if there are any differences between microwave polymerization method and water-base polymerization method with respect to 3-dimensional linear distances, in microns, from a centroid measured at nine different fiducial points on a processed acrylic. Microwave polymerization shows statistically less 3 dimensional changes compared to conventional water bath polymerization however clinically both material present almost identical results.
- Polymer Chemistry
- Medicine and Medical Research
- Manufacturing and Industrial Engineering and Control of Production Systems