Dimensional stability of maxillary denture bases flasked with the RS tension system
Keywords:Dimensional stability. Denture base. Acrylic resin stages
AbstractThis study verified the dimensional stability of maxillary denture bases flasked with the RS tension system, in relation to the Clássico acrylic resin stages, proportioned and manipulated according to manufacturer’s instructions. Fifteen maxillary wax bases were made and randomly assigned into 3 groups of 5 specimens according to the stringy, doughlike and rubbery stages of the acrylic resin. The dough of the resin was pressed in traditional metallic flasks with the aid of the RS tension system and submitted to moist heat curing cycle at 74°C for 9 hours. After the curing cycle, the flasks were allowed to cool slowly inside the curing water for 5 hours before the resin bases were removed from flasks, finished and fixed on stone casts with instantaneous adhesive. The resin base-stone cast sets were transversally sectioned into 3 sections and the base-stone gap measured at 5 points in each section. The results were submitted to ANOVA and Tukey’s test and showed that the stringy, doughlike and rubbery stages presented values with statistically significant difference (p<.05) on denture bases accuracy. The best results were observed in the doughlike stage pressing, following by the stringy and rubbery stages.
Anusavice KJ. Phillip’s Science of Dental Materials, 10th ed., Philadelphia: W.B. Saunders; 1996.
Skinner EW. Acrylic denture base materials: their physical properties and manipulation. J Prosthet Dent 1951; 1, 161-167.
Becker CM, Smith DE, Nicholls JI. The comparison of denturebase processing techniques. II. Dimensional changes due to processing. J Prosthet Dent 1977; 37, 450-459.
Peyton FA. Packing and processing denture base resins. J Am Dent Assoc 1950; 40, 520-528.
Woelfel JB. Processing complete dentures. Dent Clin N Am 1977; 21, 329-338.
Jacobson TE, Krol AJ. A contemporary review of the factors involved in complete dentures. Part III: Support. J Prosthet Dent 1983; 49, 306-313.
Craig RG, Berry GC, Peyton FA. Physical factors related to denture retention. J Prosthet Dent 1960; 10, 459-467.
Polyzois GL. Improving the adaptation of denture base by anchorage to the casts: a comparative study. Quintessence Int 1990; 3, 185-190.
Zissis A, Huggett R, Harrison A. Measurement methods used for the determination of dimensional accuracy and stability of denture base materials. J Dent 1991; 19, 199-206.
Chen JC, Lacefield WR, Castleberry DJ. Effect of denture thickness and curing cycle on the dimensional stability of acrylic resin denture base. Dent Mater 1988; 4, 20-24.
Consani RLX, Domitti SS, Rizzatti-Barbosa CM, Consani S. Effect of commercial acrylic resins on dimensional accuracy of the maxillary denture base. Braz Dent J 2002; 13, 57-60.
Firtell DN, Green A.J, Elahi JM. Posterior peripheral seal distortion related to processing temperature. J Prosthet Dent 1981; 45, 598-601.
Sanders JL, Levin B, Reitz PV. Comparison of adaptation of acrylic resin cured by microwave energy and conventional water bath. Quintessence Int 1991; 22, 181-186.
Woelfel JB, Paffenbarger GC, Sweeney WT. Dimensional changes occurring in dentures during processing. J Am Dent Assoc 1960; 61, 413-430.
Turck MD, Lang BR, Wilcox DE, Meiers JC. Direct measurement of dimensional accuracy with three dentureprocessing techniques. Int J Prosthod 1992; 5, 367-372.
Takamata T, Setcos JC, Phillips RW, Boone ME. Adaptation of acrylic resin denture as influenced by the activation mode of polymerization. J Am Dent Assoc 1989; 119, 271-276.
Grunewald AH, Paffenbarger GC, Dickson G. The effect of molding processes on some properties of denture resins. J Am Dent Assoc 1952; 44, 269-284.
Mowery WE, Burns CL, Dickson G, Ekstrand KG. Dimensional stability of denture base resins. J Am Dent Assoc 1958; 57, 345- 353.
Consani RLX, Domitti SS, Consani S. Effect of a new system used in acrylic resin flasking on the dimensional stability of denture bases. J Prosthet Dent 2002; 88, 285-289.
Consani RLX, Correr Sobrinho L, Sinhoreti MAC, Boscato N. Effect of resin stages on the dimensional accuracy of denture bases. Braz J Oral Sci 2002; 1, 71-75.
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