Objectives: Measurements of pin opening are commonly reported in evaluations of complete denture processing systems. Tooth movement is thought to be the cause for pin opening, but is infrequently reported. This study compared differences in denture tooth movement during processing with either Success injection molding method or conventional compression molding and with a two or three-pour flasking technique. Methods: Two sets of 12 complete dentures were waxed and invested in either 2 or 3 pours of Type III stone. For each pour type, 6 denture sets were processed via Success injection molding and 6 with conventional compression molding. Immediately prior to flasking and after processing, measurements were made from reference points on the master cast to reference points on selected teeth. Occlusal measurements were compared to give lingual & buccal (the “X” coordinate) and anterior & posterior (the “Y” coordinate) movement. Similar measurements were made from a lateral perspective. A one-way ANOVA was run for tooth movement in X and Y for the factors: processing method (Success versus compression), number of pours for flasking (2 versus 3), arch (maxillary versus mandibular), and location (second molar, first premolar and central). Results: No significant differences were found in movements in the lateral view. In the occlusal view, significant differences were found for the Y dimension for the factors “processing methods” and “arches.” No significant interactions were evident. Conclusions: Processing method has some impact on tooth movement; however, the clinical significance may be minimal. The combined movement of maxillary and mandibular denture teeth, regardless of flasking and processing method, may be of clinical relevance.

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