The Journal of Contemporary Dental Practice

Register      Login



Volume / Issue

Online First

Related articles

VOLUME 23 , ISSUE 8 ( August, 2022 ) > List of Articles


Influence of Thermocycling and Surface Treatments on the Flexural Strength of Denture Base Resin: An In Vitro Study

Kusum Datta

Keywords : Acrylic resin, Denture repair, Flexural strength, Poly(methyl methacrylate)

Citation Information : Datta K. Influence of Thermocycling and Surface Treatments on the Flexural Strength of Denture Base Resin: An In Vitro Study. J Contemp Dent Pract 2022; 23 (8):788-792.

DOI: 10.5005/jp-journals-10024-3387

License: CC BY-NC 4.0

Published Online: 29-11-2022

Copyright Statement:  Copyright © 2022; The Author(s).


Aim: The purpose of this study was to evaluate the flexural strength of heat polymerized denture base resin after thermocycling and different surface treatments done prior to repair or relining. Materials and methods: In this in vitro study, 80 specimens were made with heat-polymerized denture base resin and thermocycled (500 cycles between 5 and 55 °C). The specimens were divided in four groups based on different types of surface treatment: group I (control group: without surface treatment), group II (chloroform for 30 seconds), group III [methyl methacrylate (MMA) for 180 seconds], and group IV (dichloromethane for 15 seconds). The flexural strength was assessed using a Universal testing machine with three-point bending test. The obtained data were subjected to statistical analysis using one-way ANOVA and post-hoc tests. Results: The values of average flexural strength of denture base resin measured were as follows: group I: 111.1 MPa, group II: 86.9 MPa, group III: 73.1 MPa, and group IV: 78.8 MPa. Groups II and IV possessed superior flexural strength than group III. The maximum values were observed with the control group. Conclusion: The flexural strength of heat-polymerized denture base resin gets affected by different surface treatments done prior to relining procedures. Lowest flexural strength was obtained when treated with MMA monomer for 180 seconds as compared to the other etchants used. Clinical significance: Prior to denture repair procedures, operators must choose the chemical surface treatment judiciously. It should not affect the mechanical properties such as flexural strength of denture base resins. Reduction in flexural strength of polymethyl methacrylate (PMMA) denture base can predispose the prosthesis to deteriorated performance when in function.

  1. Diaz-Arnold AM, Vargas MA, Shaull KL, et al. Flexural and fatigue strengths of poly methylmethacrylate. J Prosthet Dent 2008;100:47–51. DOI: 10.1016/S0022-3913(08)60136-5.
  2. Alzayyat ST, Almutiri GA, Aljandan JK, et al. Effects of SiO2 incorporation on the flexural properties of a denture base resin: An in vitro study. Eur J Dent 2022;16(1):188–194. DOI: 10.1055/s-0041-1732806.
  3. Faot F, Silva WJ, Rosa RST, et al. Strength of poly methylmethacrylates repaired with auto- and visible light-polymerized materials. J Prosthodont 2009;18:496–502. PMID: 29285033.
  4. Fouda SM, Gad MM, Ellakany P, et al. Flexural properties, impact strength, and hardness of nanodiamond-modified PMMA denture base resin. Int J Biomater 2022;2022:6583084. DOI: 10.1155/2022/ 6583084.
  5. Diaz-Arnold AM, Vargas MA, Shaull KL, et al. Flexural and fatigue strengths of poly methylmethacrylate. J Prosthet Dent 2008;100:47–51. DOI: 10.1016/S0022-3913(08)60136-5.
  6. Ali IL, Yunus N, Abu-Hassan MI. Hardness, flexural strength, and flexural modulus comparisons of three differently cured denture base systems. J Prosthodont 2008;17:545–549. DOI: 10.1111/j.1532-849X.2008.00357.x.
  7. Deb S, Muniswamy L, Thota G, et al. Impact of surface treatment with different repair acrylic resin on the flexural strength of denture base resin: An in vitro study. J Contemp Dent Pract 2020;21(10):1137–1140. PMID: 33686035.
  8. Al-Thobity AM, Gad MM. Effect of silicon dioxide nanoparticles on the flexural strength of heat-polymerized acrylic denture base material: A systematic review and meta-analysis. Saudi Dent J 2021;33(8):775–783. DOI: 10.1016/j.sdentj.2021.08.008.
  9. Ellakwa AE, El-Sheikh AM. Effect of chemical disinfectants and repair materials on the transverse strength of repaired heat-polymerized acrylic resin. J Prosthodont 2006;15:300–305. DOI: 10.1111/j.1532-849X.2006.00131.x.
  10. Li GH, Chen S, Grymak A, et al. Fibre-reinforced and repaired PMMA denture base resin: Effect of placement on the flexural strength and load-bearing capacity. J Mech Behav Biomed Mater 2021;124:104828. DOI: 10.1016/j.jmbbm.2021.104828.
  11. de Oliveira Limírio JPJ, Gomes JML, Alves Rezende MCR, et al. Mechanical properties of polymethyl methacrylate as a denture base: Conventional versus CAD–CAM resin – A systematic review and meta-analysis of in vitro studies. J Prosthet Dent 2021:S0022-3913(21)00166-9. DOI: 10.1016/j.prosdent.2021.03.018.
  12. Gad MM, Abualsaud R, Fouda SM, et al. Effects of denture cleansers on the flexural strength of PMMA poly methylmethacrylate modified with ZrO2 nanoparticles. J Prosthodont 2021;30(3):235–244. DOI: 10.1111/jopr.13234.
  13. Shimizu H, Kakigi M, Fujii J, et al. Effect of surface preparation using ethyl acetate on the shear bond strength of repair resin to poly methylmethacrylate. J Prosthodont 2008;17:451–455. DOI: 10.1111/ j.1532-849X.2008.00326.x
  14. Machado, AL, Puckett, AD, Breeding, LC, et al. Effect of thermocycling on the flexural and impact strength of urethane-based and high-impact poly methylmethacrylates. Gerodontology 2012;29:e318–e323. DOI: 10.1111/j.1741-2358.2011.00474.x.
  15. AlQahtani M, Haralur SB. Influence of different repair acrylic resin and thermocycling on the flexural strength of poly methylmethacrylate. Medicina (Kaunas) 2020;56(2):50. DOI: 10.3390/medicina56020050.
  16. Gad MM, Fouda SM, Abualsaud R, et al. Strength and surface properties of a 3D-printed denture base polymer. J Prosthodont 2021;31(5):412–418. DOI: 10.1111/jopr.13413.
  17. Sarac D, Sarac YS, Basoglu T, et al. The evaluation of microleakage and bond strength of a silicone-based resilient liner following denture base surface pre-treatment. J Prosthet Dent 2006;95(2):143–151. DOI: 10.1016/j.prosdent.2005.11.012.
  18. Can G, Ozdemir T, Usnamaz A. Effect of thermocycling and treatment with monomer on mechanical properties of soft denture liner Molloplast B. Int J Adhesion Adhesives 2009;29:812–814.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.