Abstract
Objective: The aim of this study was to analyze the reproducibility of the anatomic models of edentulous maxillary and mandibular arches. Material and Methods: Alginate molds of the edentulous arches of standard model were performed and the tray was placed to the special device. These models received three metal spheres on surface with two positioned on the crest of the alveolar ridge (spheres 1 and 2) and other one perpendicular to the intersection of the midpalatal suture (sphere 3) and impression was performed using alginate. The proportion powder/liquid was measured according manufacturer for both arches. To double molding technique with alginate was necessary to uniformly relieve using an acetate film. After that, were performed the first impression and the second layer of alginate with conventional water-powder-proportion and also the second layer of alginate with altered water-powder-proportion. The distances of each spheres were obtained using a three-dimensional measuring-machine, and the data were analyzed by Dunnet, ANOVA and Tukey tests with a significant level of 5%. Results: A comparison of the water-powder-proportion showed significant differences in the maxillary archer with sphere distance between 3-2 (p < 0.0001) and 1-3 (p < 0.0001). The mandibular archer showed significant differences when relief between distance 1-2 (p<0.041). The Dunnet test showed different in 1-2 mandibular groups (p < 0.0450). Conclusion: The reline alginate techniques showed differences in results in comparison to the conventional technique, however, the proportion water/powder technique modified, decreasing the viscosity, showed satisfactory results, the relief variable showed no difference statistically significantly and the techniques proposed could be employed in clinical practice.KeywordsAlginate; Complete denture; Edentulism.
Highlights
Complete dentures should restore the masticatory function, phonetics, aesthetics and, in addition, be pleasant for the patient
Adequate impression procedures are essential to obtain a peripheral sealing zonefor good retention and proper extensions for support and stability of a complete denture [2]
This stage of fabricating complete dentures aims to customize the denture bases that will promote the optimal denture-supporting area and ensure that the border form of the prostheses provides a peripheral seal and it is directly proportional to the reproduction of the tissues [3]
Summary
Complete dentures should restore the masticatory function, phonetics, aesthetics and, in addition, be pleasant for the patient. For these requirements, retention and stability of the prosthesis should be appropriate and important to accomplish this step [1]. Adequate impression procedures are essential to obtain a peripheral sealing zonefor good retention and proper extensions for support and stability of a complete denture [2]. The use of elastic materials such as alginate is common for this type of procedure, since it produces the appropriate mold at this stage of the treatment. The main factors responsible for the success of this type of material are: ease of handling, patient comfort, low cost and the fact it does not require sophisticated equipment [5]
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