Comparative Evaluation of Flexural and Impact Strength of Denture Base Acrylic Resin using Different Processing Methods
An in-vitro Study
DOI:
https://doi.org/10.55995/j-cpi.2023001Keywords:
Flexural strength, Four-point bend test, Impact strength, IZOD impact tester, PolymethylmethacrylateAbstract
Background: One of the chief limitations of Polymethylmethacrylate denture base material is its inadequate mechanical property. Different processing methods of Polymethylmethacrylate have varying influences on the mechanical properties of denture base material.
Aim: The aim of our in-vitro study was to comparatively evaluate the flexural and impact strength values between CAD-CAM, Compression-molded and Injection- molded Polymethylmethacrylate specimens.
Materials and methods: A total of 66 acrylic rectangular specimens of ISO Standardization (64 x10 x3.3mm) were fabricated. This study was conducted between three groups: Group I (n=22)-CAD-CAM Milled specimens (Ruthinium, India), Group II (n=22)- Compression-molded specimens (Dental Products of India, Chennai), Group III (n=22)- Injection-molded specimens (SR- Ivocap High Impact, Ivoclar Vivadent). Flexural strength was evaluated using four-point bend test and Impact strength by IZOD Impact tester. Kruskal Wallis unpaired test was used to compare the mean values between groups and Mann Whitney U test was used to carry out pair wise comparison.
Results: Flexural strength of CAD-CAM samples were found to be statistically highest followed by injection molded specimens. Conversely, Impact strength of injection- molded specimens were highest followed by CAD-CAM specimens. Flexural as well as impact strength values were found to be least among compression-molded specimens.
Conclusion: CAD-CAM specimens exhibited higher flexural strength whereas Injection-molded specimens had the highest impact strength.
References
Anusavice KJ, Shen C, Rawls R. Philips Science of dental materials.12thed.Philadelphia: Saunders/Elsevier; 2012.P 475.
Charalampakis G, Belibasakis GN. Microbiome of peri-implant infections: lessons from conventional, molecular and metagenomic analyses. Virulence. 2015; 6 (3):183-7.
https://doi.org/10.4161/21505594.2014.980661
Khindria S K, Mittal S, Sukhija U. Evolution of denture base materials. J Indian Prosthodont Soc.2009; 9: 64-9. https://doi.org/10.4103/0972-4052.55246
Pfeiffer P et al. Flexural strength and modulus of hypoallergenic denture base materials. J Prosthet Dent. 2005; 93:372-377. https://doi.org/10.1016/j.prosdent.2005.01.011
Chander NG.Polymethylmetha acrylate denture base: An overview. J Indian Prosthodont Soc. 2018;18(2):87-88. https://doi.org/10.4103/jips.jips_91_18
de Oliveira Limírio JPJ, Gomes JML, Alves Rezende MCR, Lemos CAA, Rosa CDDRD, Pellizzer EP. Mechanical properties of polymethyl methacrylate as a denture base: Conventional versus CAD-CAM resin - A systematic review and metaanalysis of in vitro studies. J Prosthet Dent. 2021 21:166-9.
Ayman AD. The residual monomer content and mechanical properties of CADCAM resins used in the fabrication of complete dentures as compared to heat cured resins. Electron Physician. 2017 9(7):4766-4772.; https://doi.org/10.19082/4766
Ladha K, Shah D. An in-vitro evaluation of the flexural strength of heat-polymerized poly (methyl methacrylate) denture resin reinforced with fibers. J Indian Prosthodont Soc. 2011;11(4):215-220. https://doi.org/10.1007/s13191-011-0086-5
Marei MK. Reinforcement of denture base resin with glass fillers. J Prosthodont. 1999 ;8(1):18-26. https://doi.org/10.1111/j.1532-849X.1999.tb00004.x
Aguirre BC, Chen JH, Kontogiorgos ED, Murchison DF, Nagy WW. Flexural strength of denture base acrylic resins processed by conventional and CAD-CAM methods. J ProsthetDent. 2020; 123(4):641-646. https://doi.org/10.1016/j.prosdent.2019.03.010
Al-Diwari ZN, Tahboub KY, Baba NZ, Goodacre CJ. A Comparison of the Flexural and Impact Strengths and Flexural Modulus of CAD/CAM and Conventional Heat-Cured Polymethyl Methacrylate (PMMA). J Prosthodont 2020; 29(4):341-349.
Jaikumar RA, Karthigeyan S, Ali SA, Naidu NM, Kumar RP, Vijayalakshmi K. Comparison of flexural strength in three types of denture base resins: An in vitro study. J Pharm Bioallied Sci. 2015; 7(Suppl 2):S461-4.
Alhotan A, Yates J, Zidan S, Haider J, Silikas N. Assessing Fracture Toughness and Impact Strength of PMMA Reinforced with Nano-Particles and Fiber as Advanced Denture Base Materials. Materials (Basel).2021 24;14(15):4127. https://doi.org/10.3390/ma14154127
Beyli MS, von Fraunhofer JA. An analysis of causes of fracture of acrylic resin dentures. J Prosthet Dent. 1981; 46(3):238-4. https://doi.org/10.1016/0022-3913(81)90206-7
Komiyama O, Kawara M. Stress relaxation of heat-activated acrylic denture base resin in the mold after processing. J Prosthet Dent. 1998;79(2):175-81. https://doi.org/10.1016/S0022-3913(98)70213-6
Darbar UR, Huggett R, Harrison A. Stress analysis techniques in complete dentures. J Dent.1994; 22:259-64. https://doi.org/10.1016/0300-5712(94)90054-X
Ansari, Manoraj. Effects of injection-moulding parameters on impact strength of polypropylenehydroxyaptitebiocomposite.J.Mech.E ng.Sci.2017;11(2):2581-91. https://doi.org/10.15282/jmes.11.2.2017.2.0236
Da Silva Barboza A, Fang LK, Ribeiro JS, Cuevas-Suárez CE, Moraes RR, Lund
RG. Physiomechanical, optical, and antifungal properties of polymethyl methacrylate modified with metal methacrylate monomers. J Prosthet Dent. 2021; 125(4):706.e1-706.e6.
https://doi.org/10.1016/j.prosdent.2020.12.039
Faot F, Costa MA, Del Bel Cury AA, Rodrigues Garcia RC. Impact strength and fracture morphology of denture acrylic resins. J Prosthet Dent. 2006; 96(5):367-3.
https://doi.org/10.1016/j.prosdent.2006.08.001
Kirad et al. Evaluation of Flexural and Impact Strength of CAD- CAM and Two Different Conventional Denture Base Resins: An In Vitro study. Int J Prosthodont and Restorative Dentistry.2020;10(2):72-5. https://doi.org/10.5005/jp-journals-10019-1271
Dagar SR, Pakhan AJ, Thombare RU, Motwanibk. The evaluation of flexural strength and impact strength of heat-polymerized polymethyl methacrylate denture base resin reinforced with glass and nylon fibers: An in vitro study. J Indian Prosthodont Soc. 2008;8:98-104. https://doi.org/10.4103/0972-4052.43612
Gharechahi J, Asadzadeh N, Shahabian F, Gharechahi M. Flexural strength of acrylic resin denture bases processed by two different methods. J Dent Res Dent Clin Dent Prospects. 2014;8(3):148-152.
Goodacre BJ, Goodacre CJ, Baba NZ, Kattadiyil MT. Comparison of denture base adaptation between CAD-CAM and conventional fabrication techniques. J Prosthet Dent. 2016; 116(2):249-56.https://doi.org/10.1016/j.prosdent.2016.02.017
Morris JC, Khan Z, von Fraunhofer JA. Palatal shape and the flexural strength of maxillary denture bases. J Prosthet Dent.1985;53(5):670-3.
https://doi.org/10.1016/0022-3913(85)90018-6
Banerjee R, Banerjee S, Prabhudesai PS, Bhide SV. Influence of the processing technique on the flexural fatigue strength of denture base resins: An in vitro investigation. Indian J Dent Res. 2010; https://doi.org/10.4103/0970-9290.70810 21(3):391-5.
Clements JL, Tantbirojn D, Versluis A, Cagna DR. Do denture processing techniques affect the mechanical properties of denture teeth? J Prosthet Dent. 2018; 120(2):246-251.
https://doi.org/10.1016/j.prosdent.2017.10.025
Alghazzawi TF. Advancements in CAD/CAM technology: Options for practical implementation. J Prosthodont Res. 2016; 60(2):72-84. https://doi.org/10.1016/j.jpor.2016.01.003
ISSN: 2582-9904 Flexural and impact strength of denture base acrylic resin J Clin Prosth Impl 2023;5(1):4-10 10 https://doi.org/10.55995/j-cpi.2023001
Choudhary S. Complete denture fracture - A proposed classification system and its incidence in National Capital Region population: A survey. J Indian Prosthodont Soc.2019;19(4):307-312. https://doi.org/10.4103/jips.jips_312_18
Chander NG, Jayaraman V, Sriram V. Comparison of ISO and ASTM standards in determining the flexural strength of denture base resin. Eur Oral Res. 2019 ;53(3):137-140.
https://doi.org/10.26650/eor.20190072
Nguyen JF, Migonney V, Ruse ND, Sadoun M. Resin composite blocks via high-pressure hightemperature polymerization. Dent Mater. 2012;28(5):529-34.
https://doi.org/10.1016/j.dental.2011.12.003
Phoenix RD. Denture base materials. Dent Clin North Am.1996;40:113-20. https://doi.org/10.1016/S0011-8532(22)00166-5
Revised American Dental Association specification no. 12 for denture base polymers. J Am Dent Assoc.1975;90(2):451-8. https://doi.org/10.14219/jada.archive.1975.0069
Chhabra M, Nanditha Kumar M, RaghavendraSwamy K N, Thippeswamy H M. Flexural strength and impact strength of heat-cured acrylic and 3D printed denture base resins- A
comparative in vitro study. J Oral BiolCraniofac Res. 2022 ;12(1):1-3.
Polyzois GL, Lagouvardos PE, Frangou MJ. Flexural and bond strengths of relined denture polymers assessed by four-point bending tests and Weibull analysis. Gerdontology. 2012; 29(2):e543- 52. https://doi.org/10.1111/j.1741-2358.2011.00515.x
Pacquet W, Benoit A, Hatège-Kimana C, Wulfman C. Mechanical properties of CAD/CAMdenture base resins. Int J Prosthodont 2019;32:104-6. https://doi.org/10.11607/ijp.6025
Somani MV, Khandelwal M, Punia V, Sharma V. he effect of incorporating various reinforcement materials on flexural strength and impact strength of Polymethylmethacrylate: A meta-analysis. J Indian Prosthodont Soc. 2019 ;19(2):101-112. https://doi.org/10.4103/jips.jips_313_18
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