OBJECTIVES: To verify the dimensional accuracy of upper complete denture bases under the effect of different methods of metallic flask closure. MATERIALS AND METHODS: Wax record bases were assigned to six groups: 1-2: traditional clamp; 3-4: RS system; and 5-6: flask with screws. Flasks were immediately polymerised or bench stored for 6 h prior to polymerisation. Resin base-cast sets were sectioned at regions corresponding to the canines, first molars and posterior palatal zone. Gap discrepancies were measured at five points: right and left ridge crests, palatal midline, and right and left marginal limits of the flanges. An optical micrometer was used for measurement purposes. RESULTS: Data were submitted to anova, and the means compared by Tukey's test (alpha = 0.05). Results revealed significant differences in the flask closure technique, polymerisation time, section, and their interactions. Discrepancy values for the RS system and flask with screws were significantly lower than those related to the traditional clamp, regardless of whether resin polymerisation was immediate or delayed for 6 h. CONCLUSIONS: Flask closure methods should be considered when the denture base stability and comfort of the patient are being assessed during clinical use of the dentures.
OBJECTIVES: To verify the dimensional accuracy of upper complete denture bases under the effect of different methods of metallic flask closure. MATERIALS AND METHODS: Wax record bases were assigned to six groups: 1-2: traditional clamp; 3-4: RS system; and 5-6: flask with screws. Flasks were immediately polymerised or bench stored for 6 h prior to polymerisation. Resin base-cast sets were sectioned at regions corresponding to the canines, first molars and posterior palatal zone. Gap discrepancies were measured at five points: right and left ridge crests, palatal midline, and right and left marginal limits of the flanges. An optical micrometer was used for measurement purposes. RESULTS: Data were submitted to anova, and the means compared by Tukey's test (alpha = 0.05). Results revealed significant differences in the flask closure technique, polymerisation time, section, and their interactions. Discrepancy values for the RS system and flask with screws were significantly lower than those related to the traditional clamp, regardless of whether resin polymerisation was immediate or delayed for 6 h. CONCLUSIONS: Flask closure methods should be considered when the denture base stability and comfort of the patient are being assessed during clinical use of the dentures.
Authors: Rafael L X Consani; Leonardo G Sonehara; Marcelo F Mesquita; Valentim A R Barão; Conrado R Caetano Journal: J Oral Biol Craniofac Res Date: 2015-07-15
Authors: Ana Paula Barbosa Lima; Rafael Pino Vitti; Marina Amaral; Ana Christina Claro Neves; Lais Regiane da Silva Concilio Journal: J Adv Prosthodont Date: 2018-04-18 Impact factor: 1.904