Abstract
Introduction: The dimensional alterations of denture base jeopardize adaptation and retention associated to altered occlusion, which are considered relevant factors for fabrication of complete dentures. Objective: The aim of this study was to evaluate linear tooth displacement during processing of maxillary complete dentures submitted to two inclusion methods and conventional polymerization. Material and method: Twenty maxillary complete dentures were fabricated: G1 – inclusion with silicone barrier, and G2 – inclusion with dental stone type IV barrier. Points were marked on incisal surface of right central incisor and cusp of second molars to allow linear measurement of the replicas through the software AutoCAD. The evaluation of artificial teeth displacement for both groups was carried out in different moments: a) waxed denture; b) waxed denture partially invested with stone or silicone barrier; c) after complete flasking; d) denture into flask after polymerization; e) denture attached to the cast after deflasking; f) denture separated from the cast; g) denture after finishing and polishing; h) denture after storage in water at 36° during 7 days. Result: Linear alterations occurred on artificial teeth positioning for both groups and in all periods of inclusion, with higher alterations for group G2. The data from phases c and d were significant different from other phases when compared intra groups, for both inclusion methods evaluated. Conclusion: Group G2 exhibited the greatest alterations. After polymerization, group G1(Inclusion with silicone barrier complemented with dental stone type III) demonstrated higher distance between the points (expansion) while group G2 revealed reduced distance (contraction).
Highlights
The complete dentures are clinically significant due to the high incidence of edentulous patients that need rehabilitation with efficient and comfortable dentures to allow social adaptation and participation.So, the clinical and laboratorial phases should not be neglected to avoid failures on final result
The results showed that all the measured distances presented changes in tooth displacement after denture processing and the differnces between the flask system were no statistically significant
The evaluation of artificial teeth displacement for both groups was carried out in the following conditions: a) waxed denture; b) waxed denture invested with silicone or dental stone type IV barrier with partial pouring with dental stone type III without covering of incisal and occlusal surfaces; c) complete flasking of waxed denture; d) denture into flask after polymerization; e) denture attached to the cast after deflasking; f) denture separated from the cast; g) denture after finishing and polishing; h) denture after storage in water at 36o during 7 days
Summary
The complete dentures are clinically significant due to the high incidence of edentulous patients that need rehabilitation with efficient and comfortable dentures to allow social adaptation and participation.So, the clinical and laboratorial phases should not be neglected to avoid failures on final result. A study to minimize these alterations should consider the materials, techniques for inclusion and polymerization, and professional skill Even following these considerations, it’s suggested to replace the denture in articulator after polymerization to assess alterations on teeth position due to inherent characteristics of the materials as stone expansion, acrylic resin shrinkage or stress release after deflasking. All these occurrences allow alterations on teeth position with great effect on occlusal relation and may alter the previously established vertical dimension or generate deflective premature contacts leading to failure of masticatory system. Wesley et al [1] and Sidhaye & Master [2] demonstrated the importance and necessity for harmonization of occlusal contacts before dentures insertion
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