TODENTJ-25-03-2019_TODENTJ-3-21 1553505033 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 3 6 2009 3 1 Wagner A Negreiros Rafael L.X Consani Marcelo F Mesquita Mario A.C Sinhoreti Ivan R Faria The purpose of this study was to verify the influence of flask closure methods and post-pressing times on tooth displacement in maxillary dentures. Twenty similar maxillary dentures were made using a heat-polymerized acrylic resin, and randomly assigned to 4 experimental groups (n=5) according to the protocol: 1-conventional flask closure and immediate polymerization; 2- conventional flask closure and polymerization after 6-hour post-pressing time; 3- RS flask closure system and immediate polymerization; and 4- RS flask closure system and polymerization after 6-hour post-pressing time. Three transverse and 2 anteroposterior linear distances between teeth were measured before and after the denture processing with an optical microscope with accuracy of 0.0005mm. Analysis of variance (ANOVA) and Tukey’s test were performed to compare the results. The 6-hour post-pressing time (conventional = 0.44mm and RS = 0.33mm) showed no statistically significant difference in tooth movement, in relation to the flask closure methods, when compared to the immediate time (conventional = 0.40mm and RS = 0.28mm). The RS system standardized the tooth displacement, independently of the post-pressing times. Dimensional changes were more uniform when the dentures were submitted to the 6-hour post-pressing time and RS flask closure method, suggesting that these factors may reduce the magnitude of tooth movement. 3 6 2009 21 25 TODENTJ-3-21 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2008-6-12 2008-10-28 2009-1-21 2009-3-6 http://creativecommons.org/licenses/by-nc/3.0/ 10.2174/1874210600903010021 1553505033 https://opendentistryjournal.com/VOLUME/3/PAGE/21/ https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-21/TODENTJ-3-21.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-21/TODENTJ-3-21.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-21/TODENTJ-3-21.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-21/TODENTJ-3-21.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-21/TODENTJ-3-21.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-21/TODENTJ-3-21.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-21/TODENTJ-3-21.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-21/TODENTJ-3-21.xml J Prosthet Dent Shetty NS 56 644 1986 Shetty NS, Udani TM. Movement of artificial teeth in waxed trial dentures J Prosthet Dent 1986; 56 (5) : 644-8. J Prosthet Dent McCartney JW 52 545 1984 McCartney JW. Flange adaptation discrepancy, palatal base distortion, and induced malocclusion caused by processing acrylic resin maxillary complete dentures J Prosthet Dent 1984; 52 (4) : 545-3. J Prosthet Dent Becker CM 37 450 1977 Becker CM, Smith DE, Nocholls JI. The comparison of denture base processing techniques. Part 1. Material characteristics J Prosthet Dent 1977; 37 (4) : 450-9. J Am Dent Assoc Peyton FA 40 520 1950 Peyton FA. Packing and pressing denture base resins J Am Dent Assoc 1950; 40 : 520-8. J Prosthet Dent Firtell DN 45 598 1981 Firtell DN, Green AJ, Elahi JM. Posterior peripheral seal distortion related to processing temperature J Prosthet Dent 1981; 45 (6) : 598-601. J Am Dent Assoc Mowery WE 57 345 1958 Mowery WE, Burns CL, Dickson G, Sweeney WT. Dimensional stability of denture base resins J Am Dent Assoc 1958; 57 : 345-52. J Prosthet Dent Huggett R 68 634 1992 Huggett R, Zissis A, Harrison A, Dennis A. Dimensional accuracy and stability of acrylic resin denture bases J Prosthet Dent 1992; 68 (4) : 634-40. J Prosthet Dent Consani RLX 88 285 2002 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 (3) : 285-9. Eur J Prosthodont Rest Dent Boscato N 13 164 2003 Boscato N, Consani RLX, Consani S, Cury AADB. Effect of investment material and water immersion time on tooth movement in complete denture Eur J Prosthodont Rest Dent 2003; 13 (4) : 164-9. Braz Dent J Pavan S 16 119 2005 Pavan S, Arioli-Filho JN, Santos PH, Mollo FA. Effect of microwave treatments on dimensional accuracy of maxillary acrylic resin denture base Braz Dent J 2005; 16 (2) : 119-23. J Prosthet Dent Consani S 97 173 2007 Consani S, Mesquita MF, Nobilo MAA, Henriques GEP. Influence of simulated microwave disinfection on complete denture base adaptation using different flask closure methods J Prosthet Dent 2007; 97 (3) : 173-8. Anusavice KJ. Phillips’science of dental materials In: Philadelphia: WB Saunders 1996; p. 243. J Am Dent Assoc Winkler S 82 349 1971 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. J Prosthet Dent Reeson MG 82 359 1999 Reeson MG, Jepson NJA. Achieving an even thickness in heat-polymerized acrylic resin denture bases for complete dentures J Prosthet Dent 1999; 82 (3) : 359-61. J Dent Res Kawara M 77 1446 1998 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 (6) : 1446-53. J Prosthet Dent Barco MT 42 17 1979 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 (1) : 17-22. J Prosthet Dent Anthony DH 9 683 1959 Anthony DH, Peyton FA. Evaluating dimensional accuracy of denture bases with a modified comparator J Prosthet Dent 1959; 9 (4) : 683-92. Quintessence Int Polyzois GL 21 185 1990 Polyzois GL. Improving the adaptation of denture base by anchorage to the casts: a comparative study Quintessence Int 1990; 21 : 185-90. J Prosthet Dent Wesley RC 29 46 1973 Wesley RC, Henderson D, Frazier QZ, et al. Processing changes in complete dentures: posterior tooth contacts and pin opening J Prosthet Dent 1973; 29 (1) : 46-53. J Prosthodont Consani RLX 15 229 2006 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 (4) : 229-34. J Prosthet Dent Becker CM 37 451 1977 Becker CM, Smith DE, Nicholls BE. The comparison of denture-base processing techniques. Part II. Dimensional changes due to processing J Prosthet Dent 1977; 37 (2) : 451-9. Austr Dent J Atkinson HF 7 101 1962 Atkinson HF, Grant AA. An investigation into tooth movement during the packing and polymerization of acrylic resin denture base materials Austr Dent J 1962; 7 (2) : 101-8. J Prosthet Dent Kyes FM 1 196 1951 Kyes FM. Laboratory’s role in successful full dentures J Prosthet Dent 1951; 1 (2) : 196-203. J Prosthet Dent Lorton L 42 23 1979 Lorton L, Phillips RW. Heat-released stress in acrylic dentures J Prosthet Dent 1979; 42 (1) : 23-6.