Keywords
artificial. Dental occlusion. Polymerization. Acrylic resin
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Abstract
Keeping the flask closed may reduce the stress released by the resin dough after the pressing step, preserving the tooth relationship pattern. The aim of this study was to analyze the influence of the flask contention method on tooth displacement in acrylic resin complete dentures. Twenty identical maxillary complete dentures were made using the heat-cured acrylic resins Classico and QC-20, polymerized by long and fast polymerization cycles respectively, and randomly assigned to 4 test groups according to the conventional packing method and RS tension system. Transversal and anteroposterior distances between specific teeth were measured with a linear optical microscope before and after denture processing. Analysis of variance (ANOVA) and Tukey test were used to compare the groups (p<.05). Results showed that tooth movement was significantly greater for the distance RI-LI in comparison with the others, and the tooth movement was not significantly influenced by the packing method. Within the limitations of this study, the RS tension system presented a similar performance in reducing the tooth movement, when compared with the conventional packing method. The anterior region of the denture may present changes in the tooth position after processing, which need to be clinically adjusted.References
Harman IM. Effects of time temperature on polymerization of a methacrylate resin denture base. J Am Dent Assoc. 1949; 38: 188-203.
Anthony DH, Peyton FA. Evaluating dimensional accuracy of denture bases with a modified comparator. J Prosthet Dent. 1959; 9: 683-92.
Thompson MJ. Masticatory efficiency as related to cusp form in denture prosthesis. J Am Dent Assoc. 1937; 24: 207-19.
Ortman HR. Complete denture occlusion. Dent Clin North Am. 1977; 21: 299-320.
Larkin JD. Tooth contacts in denture occlusion: centric and eccentric. Dent Clin North Am.1971; 15: 861-74.
Wong DMS, Cheng LYY, ChowTW, Clark RKF. Effect of processing method on the dimensional accuracy and water sorption of acrylic resin dentures. J Prosthet Dent. 1999; 81: 300-4.
Teraoka F, Takahashi J. Controlled polymerization system for fabricating precise dentures. J Prosthet Dent. 2000; 83: 514-20.
Kimoto S, Kobayashi N, Kobayashi K, Kawara M. Effect of bench cooling on the dimensional accuracy of heat-cured acrylic denture base material. J Dent. 2005; 33: 57-63.
Skinner EW, Cooper EN. Physical properties of denture resins: par I: curing shrinkage and water sorption. J Am Dent Assoc. 1943; 30: 1845-52.
Anusavice KJ. Phillips’ Science of Dental Materials. 10th ed. Philadelphia: WB Saunders; 1996.
Consani RLX, Domitti SS, Consani S. Effect of a new tension system, used in acrylic resin flasking, on the dimensional stability of denture bases. J Prosthet Dent. 2002; 88: 285-9.
Consani RLX, Mesquita MF, Sinhoreti MAC, Consani S. Influence of the deflasking delay time on the displacements of maxillary denture teeth. J Appl Oral Sci. 2003; 11: 332-6.
Consani RLX, Domitti SS, Mesquita MF, Consani S. Influence of flask closure and flask cooling methods on tooth movement in maxillary dentures. J Prosthodont. 2006; 15: 229-34.
Wesley RC, Henderson D, Frazier QZ, Rayson JH, Ellinger CW, Lutes MR, et al. Processing changes in complete dentures: posterior tooth contacts and pin opening. J Prosthet Dent.1973; 29: 46-53.
Rizzatti-Babosa CM, Dallari A. Alterações oclusais da prótese total antes e após sua polimerização. RGO. 1996; 44: 83-6.
Mainieri ET, Boone ME, Potter RH. Tooth movement and dimensional change of denture base materials using two investing methods. J Prosthet Dent. 1980; 44: 368-73.
Abuzar MAM, Jamani K, Abuzar M. Tooth movement during processing of complete dentures and its relation to palatal form. J Prosthet Dent. 1995; 73(5): 445-9.
Winkler S, Ortman HR, Morris HF, Plezia RA. Processing changes in complete dentures constructed from pour resins. J Am Dent Assoc. 1971; 82: 349-53.
Reeson MG, Jepson NJA. Achieving an even thickness in heatpolymerized acrylic resin denture bases for complete dentures. J Prosthet Dent. 1999; 82: 359-61.
Kawara M, Komiyama O, Kimoto S, Kobayashi N, Nemoto K. Distortion behavior of heat-activated acrylic denture-base resin in conventional and long, low-temperature processing methods. J Dent Res. 1998; 77: 1446-53.
Barco MT, Moore BK, Swartz ML, Boone ME, Dykema RW, Phillips RW. The effect of relining on the accuracy and stability of maxillary complete dentures – An in vitro and in vivo study. J Prosthet Dent. 1979; 42: 17-22.
Polyzois GL. Improving the adaptation of denture base by anchorage to the casts: a comparative study. Quintessence Int. 1990; 21:185-90.
Firtell DN, Green AJ, Elahi JM. Posterior peripheral seal distortion related to processing temperature. J Prosthet Dent. 1981; 45: 598-601.
Kyes FM. Laboratory’s role in successful full dentures. J Prosthet Dent. 1951; 1: 196-203.
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