Comparison of Interfacial Surface Tension and Capillarity of Maxillary Complete Dentures, Fabricated by Conventional Cuvette Technique and Injection Molding Technology

http://www.journal-imab-bg.org / J of IMAB. 2016, vol. 22, issue 3/ ABSTRACT Purpose: The purpose of this in vivo study is to register the forces necessary to displace maxillary complete dentures fabricated by compression molding and injection molding techniques on one and the same patient and to compare the interfacial surface tension and capillarity which are achieved by both techniques. Material/Methods: Two maxillary complete dentures are made for each patient (total number of patients is 30) using both technologies. The magnitude of dislodging force is measured by a dynamometer. Results: Mean ± standard deviation for conventional cuvette technique is 17,53N ± 12,11N. Mean ± standard deviation for injection molding technique is 20,73N ± 13,89N. Analysis of variance (ANOVA) revealed statistically significant differences in results achieved by conventional cuvette technique and injection molding technology. The results of injection technique were higher than those of compression molding technique (F=123,676, p< 0,001). Conclusions: Based on the results we suggest a standard for dislodging force of maxillary complete dentures fabricated by conventional cuvette technique13N, and by injection molding technology-15,5N. These values would guarantee good interfacial surface tension and capillarity. The injection molding technique was found to produce better fitting maxillary complete dentures when compared to compression molding technique. This would ensure better retention, less traumatic manifestations after insertion and higher patient’s comfort and satisfaction.