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Denture Base Adaptation (denture + base_adaptation)
Selected AbstractsOriginal article: Effect of flask closure method and post-pressing time on the upper denture base adaptationGERODONTOLOGY, Issue 3 2010Andréa F. Lira doi:10.1111/j.1741-2358.2009.00307.x Effect of flask closure method and post-pressing time on the upper denture base adaptation Objectives:, The purpose of this study was to evaluate the effect of flask-closure methods, post-pressing times and acrylic resins on denture base adaptation. Materials and methods:, The resins were flasked using a hydraulic press and closed with the traditional clamp or RS system. Conventional heat-cure resin was polymerised immediately or at 6 h post-pressing at 74°C for 9 h. Rapid cycle heat-cure resin was polymerised in boiling water for 20 min. After cooling, the bases were deflasked and the sets of cast-base transversally sectioned in the regions distal to the canine, mesial to the first molar and in the posterior palatal zone. The adaptation was measured with an optical microscope (0.0005 mm) at five reference points for each section. Data were analysed using anova and Tukey's test (, = 0.05). Results:, Traditional clamp and immediate post-pressing time improved base adaptation for conventional heat-cure resin. Both post-pressing times showed most accurate base adaptation for conventional heat-cure resin when the traditional clamp was used. Immediate post-pressing time improved base adaptation for conventional heat-cure resin and the 6-h delay in time was significant for the rapid cycle heat-cure resin. Conclusions:, Traditional clamp and immediate post-pressing time improved base adaptation for conventional heat-cure resin. [source] Effect of cooling procedure on final denture base adaptationJOURNAL OF ORAL REHABILITATION, Issue 8 2002S. M. Ganzarolli Summary Well-fitted dentures prevent hyperplasic lesions, provide chewing efficiency and promote patient's comfort. Several factors may affect final adaptation of dentures, as the type of the acrylic resin, the flask cooling procedure and the water uptake. This investigation evaluated the effect of water storage and two different cooling procedures [bench cooling (BC) for 2 h; running water (RW) at 20 °C for 45 min] on the final adaptation of denture bases. A heat-cured acrylic resin (CL, Clássico, Clássico Artigos Odontológicos) and two microwave-cured acrylic resins [Acron MC, (AC) GC Dent. Ind. Corp.; Onda Cryl (OC), Clássico Artigos Odontológicos] were used to make the bases. Adaptation was assessed by measuring the weight of an intervening layer of silicone impression material between the base and the master die. Data was submitted to ANOVA and Tukey's test (0·05). The following means were found: (BC) CL=0·72 ± 0·03 a; AC=0·70 ± 0·03 b; OC=0·76 ± 0·04 c//(RW) CL= 1·00 ± 0·11 a; AC=1·00 ± 0·12 a; OC=0·95 ± 0·10 a. Different labels join groups that are not statistically different (P > 0·05). Comparisons are made among groups submitted to the same cooling procedure (BC or RW). The conclusions are: interaction of type of material and cooling procedure had a statistically significant effect on the final adaptation of the denture bases (P < 0·05); water storage was not detected as a source of variance (P > 0·05) on the final adaptation. [source] | ||||||||||