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Polymerization cycles on hardness and surface gloss of denture bases

Rafael Leonardo Xediek Consani, Maria Giulia R. Pucciarelli, Marcelo F. Mesquita, Moises C. F. Nogueira, Valentim A. R. Barão

Abstract


The aim of this study was to evaluate different polymerization cycles on the hardness and surface gloss of acrylic resins for denture bases. Classico and Vip Cril Plus acrylic resins samples were made in dental stone molds. Powder-liquid ratio and resin manipulation were according to the manufacturers’ instructions, and the resulting mass pressed in metallic fl asks. The polymerization cycles were A - hot water bath at 74°C for 9 hours; B - hot water bath at 74°C for 8 hours + 100°C for 1 hour, and C - hot water bath at 74°C for 2 hours + 100°C for 1 hour. After polymerization, the samples were defl asked and submitted to finishing and polishing procedures, and stored in water at 37°C for 24 hours. A hardness indenter with load of 25 gf for 10 s evaluated the Knoop hardness values. A gloss meter evaluated the surface gloss using a light incidence of 60°. Data were submitted to ANOVA and Tukey’s test (α = 0.05). Hardness: There were signifi cant differences between resins regardless of polymerization cycles (Classico = 22.28 and Vip Cril Plus = 25.83). Significant differences occurred among polymerization cycles regardless of resins (A = 25.83, B = 24.64 and C = 21.73). There was similarity for the resin and cycle interaction (Classico: A = 24.51, B = 22.68 and C = 19.65; Vip Cril Plus: A = 27.15, B = 26.53 and C = 23.81). Surface gloss. Significant differences were shown between resins regardless of polymerization cycle (Classico = 57.26 and Vip Cril Plus = 49.38) and between polymerization cycles regardless of resin (A = 48.82, B = 53.46 and C = 57.68). Statistical diff erences were also found for the resin and cycle interaction (Classico: A = 52.32, B = 63.79 and C = 55.67; Vip Cril Plus: A = 45.32, B = 43.14 and C = 59.69). Diff erent polymerization cycles showed similar eff ects on hardness and different effects on the surface gloss of denture base acrylic resins.


Keywords


Acrylic resins; curing cycles; hardness; surface gloss

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References


Phoenix RD. Denture base resins. In: Anusavise KJ, editor. Phillips Science of Dental Materials. St. Louis: Saunders; 2003. p. 721-57.

Ulusoy M, Ulusoy N, Aydin AK. An evaluation of polishing techniques on surface roughness of acrylic resins. J Prosthet Dent 1986;56:107-12.

Verran J, Maryan CJ. Retention of Candida albicans on acrylic resin and silicone of different surface topography. J Prosthet Dent 1997;77:535-9.

Taylor RL, Verran J, Lees GC, Ward AJ. The influence of substratum topography on bacterial adhesion to polymethyl methacrylate. J Mater Sci Mater Med 1998;9:17-22.

Quirynen M, Bollen CM. The influence of surface roughness and surface-free energy on supra- and subgingival plaque formation in man. A review of the literature. J Clin Periodontol 1995;22:1-14.

Radford DR, Sweet SP, Challacombe SJ, Walter JD. Adherence of Candida albicans to denture-base materials with different surface finishes. J Dent 1998;26:577-83.

Quirynen M, Marechal M, Busscher HJ, Weerkamp AH, Darius PL, van Steenberghe D. The influence of surface free energy and surface roughness on early plaque formation. An in vivo study in man. J Clin Periodontol 1990;17:138-44.

Bollen CM, Lambrechts P, Quirynen M. Comparison of surface roughness of oral hard materials to the threshold surface roughness for bacterial plaque retention: a review of the literature. Dent Mater 1997;13:258-69.

Xediek Consani RL, Lacerda Vieira M, Ferraz Mesquita M, Coelho Sinhoreti MA, Danil Guiraldo R, Arruda Nóbilo MA. Effect of polymerization cycles on the linear dimensional change, hardness and impact strength of denture base acrylic resins. Minerva Stomatol 2012;61:273-82.

Harman IM. Effects of time and temperature on polymerization of a methacrylate resin denture base. J Am Dent Assoc 1949;38:188-203.

Skinner EW. Acrylic resins; an appraisal of their use in dentistry. J Am Dent Assoc 1949;39:261-8.

Gay WD, King GE. An evaluation of the cure of acrylic resin by three methods. J Prosthet Dent 1979;42:437-40.

Jackson AD, Grisius RJ, Fenster RK, Lang BR.

Dimensional accuracy of two denture base processing methods. Int J Prosthodont 1989;2:421-8.

Takamata T, Setcos JC, Phillips RW, Boone ME. Adaptation of acrylic resin dentures as influenced by the activation mode of polymerization. J Am Dent Assoc 1989;119:271-6.

Craig RG. Restorative Dental Materials. St. Louis: Mosby; 1998.

Consani RL, Vieira EB, Mesquita MF, Mendes WB, Arioli- Filho JN. Effect of microwave disinfection on physical and mechanical properties of acrylic resins. Braz Dent J 2008;19:348-53.

Reitz PV, Sanders JL, Levin B. The curing of denture acrylic resins by microwave energy. Physical properties. Quintessence Int 1985;16:547-51.

Ilbay SG, Güvener S, Alkumru HN. Processing dentures using a microwave technique. J Oral Rehabil 1994;21:103-9.

Jagger RG. Effect of the curing cycle on some properties of a polymethylmethacrylate denture base material. J Oral Rehabil 1978;5:151-7.

Austin AT, Basker RM. Residual monomer levels in denture bases. The effects of varying short curing cycles. Br Dent J1982;153:424-6.

Lai CP, Tsai MH, Chen M, Chang HS, Tay HH. Morphology and properties of denture acrylic resins cured by microwave energy and conventional water bath. Dent Mater 2004;20:133-41.

Vallittu PK, Ruyter IE, Buykuilmaz S. Effect of polymerization temperature and time on the residual monomer content of denture base polymers. Eur J Oral Sci 1998;106:588-93.

Moura JS, da Silva WJ, Pereira T, Del Bel Cury AA, Rodrigues Garcia RC. Influence of acrylic resin polymerization methods and saliva on the adherence of four Candida species. J Prosthet Dent 2006;96:205-11.

Tornavoi DC, Agnelli JA, Lepri CP, Mazzetto MO, Botelho AL,Soares RG, et al. Assessment of surface hardness of acrylic resins submitted to accelerated artificial aging. Minerva Stomatol 2012;61:283-8.

Farina AP, Cecchin D, Soares RG, Botelho AL, Takahashi JM, Mazzetto MO, et al. Evaluation of Vickers hardness of different types of acrylic denture base resins with and without glass fibre reinforcement. Gerodontology 2012;29:e155-60.

Rizzatti-Barbosa CM, Ribeiro-Dasilva MC. Influence of double flask investing and microwave heating on the superficial porosity, surface roughness, and knoop hardness of acrylic resin. J Prosthodont 2009;18:503-6.

Kawaguchi T, Lassila LV, Tokue A, Takahashi Y, Vallittu PK. Influence of molecular weight of polymethyl(methacrylate) beads on the properties and structure of cross-linked denture base polymer. J Mech Behav Biomed Mater 2011;4:1846-51.

Mörmann WH, Stawarczyk B, Ender A, Sener B, Attin T, Mehl A. Wear characteristics of current aesthetic dental restorative CAD/ CAM materials: two-body wear, gloss retention, roughness and Martens hardness. J Mech Behav Biomed Mater 2013;20:113-25.

Heintze SD, Forjanic M, Rousson V. Surface roughness and gloss of dental materials as a function of force and polishing time in vitro. Dent Mater 2006;22:146-65.

Polyzois G, Niarchou A, Ntala P, Pantopoulos A, Frangou M. Th e effect of immersion cleansers on gloss, colour and sorption of acetal denture base material. Gerodontology 2013;30:150-6.

Keyf F, Etikan I. Evaluation of gloss changes of two denture acrylic resin materials in four different beverages. Dent Mater 2004;20:244-51.

Kuhar M, Funduk N. Effects of polishing techniques on the surface roughness of acrylic denture base resins. J Prosthet Dent 2005;93:76-85.

Paravina RD, Roeder L, Lu H, Vogel K, Powers JM. Effect of finishing and polishing procedures on surface roughness, gloss and color of resin-based composites. Am J Dent 2004;17:262-6.

Da Costa J, Ferracane J, Paravina RD, Mazur RF, Roeder L. The effect of different polishing systems on surface roughness and gloss of various resin composites. J Esthet Restor Dent 2007;19:214-24.

Campbell PM, Johnston WM, O’Brien WJ. Light scattering and gloss of an experimental quartz-filled composite. J Dent Res1986;65:892-4.


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