Volume 8, Issue 3 (8-2023)                   J Res Dent Maxillofac Sci 2023, 8(3): 171-178 | Back to browse issues page

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Mehraban Jahromi S, Alidad Naeeni M, Mostafa Pour R, Nahidi R, Kaboudanian Ardestani A. Effect of One- and Two-Step Processing Techniques on Flexural Strength of Denture Base Acrylic Resin in Dry and Wet Conditions. J Res Dent Maxillofac Sci 2023; 8 (3) :171-178
URL: http://jrdms.dentaliau.ac.ir/article-1-472-en.html
1- Department of Prosthodontics, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
2- Faculty of Dentistry, Tehran Medical Science, Islamic Azad University, Tehran, Iran
3- Department of Prosthodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4- Department of Prosthodontics, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran , r.naidi@iautmu.ac.ir
5- Department of Prosthodontics, Faculty of Dentistry, Tehran Medical Science Islamic Azad University, Tehran, Iran
Abstract:   (319 Views)
Background and Aim: This study compared the flexural strength (FS) of heat-cure acrylic resin following one- and two-step processing techniques in dry and wet conditions.  
Materials and Methods: In this in vitro study, 60 acrylic specimens (3×10×65 mm) were fabricated (ISO20795-1) and flasked using a type III dental stone. The specimens were heated to 70°C for one hour and baked for 30 minutes at 100°C. After cooling and polishing, 30 specimens were randomly selected; of which, 15 were stored in 37°C water, and 15 in dry condition for one month. The remaining 30 were flasked again, baked, and divided into two subgroups for storage in dry and wet conditions. The FS of specimens was measured by a universal testing machine. Data were analyzed by one-way ANOVA and Tukey's post-hoc test (α=0.05).
Results: The mean FS was 57.5±4.8 MPa and 61.7±4 MPa for specimens subjected to one-step processing and stored in wet and dry conditions, respectively. These values were 56.6±4 MPa and 64.7±2.9 MPa for specimens subjected to two-step processing and stored in wet and dry conditions, respectively (P<0.05). The difference in FS of specimens stored in dry and wet conditions was significant (P<0.05).
Conclusion: The two-step processing technique increased the FS while water storage decreased the FS of acrylic resin. FS of specimens subjected to one-step processing with water storage was slightly higher than that of specimens subjected to two-step processing with water storage. FS experienced a greater reduction following two-step processing in a wet environment compared with one-step processing.  
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Type of Study: Original article | Subject: Prosthodontics

1. Chhabra M, Nanditha Kumar M, RaghavendraSwamy KN, Thippeswamy HM. Flexural strength and impact strength of heat-cured acrylic and 3D printed denture base resins- A com-parative in vitro study. J Oral Biol Craniofac Res. 2022 Jan-Feb;12(1):1-3. [DOI:10.1016/j.jobcr.2021.09.018] [PMID] [PMCID]
2. AlQahtani M, Haralur SB. Influence of Different Repair Acrylic Resin and Thermocycling on the Flexural Strength of Denture Base Resin. Medicina (Kaunas). 2020 Jan 21; 56(2): 50. [DOI:10.3390/medicina56020050] [PMID] [PMCID]
3. Irelan JP. Mitigating distortion of light-polymerized composite trial bases [Thesis]. United States: Marquette Uni-versity; 2009. 347 p.
4. Browning JD. A permanent-base denture technique using fluid resin. J Prosthet Dent. 1973 Oct;30(4 Pt 1):468-71. [DOI:10.1016/0022-3913(73)90172-8] [PMID]
5. Aguirre BC, Chen JH, Kontogiorgos ED, Murchison DF,Nagy WW. Flexural strength of denture base acrylic resins pro-cessed by conventional and CAD-CAM methods. J Prosthet Dent. 2020 Apr;123(4):641-6. [DOI:10.1016/j.prosdent.2019.03.010] [PMID]
6. Gad MM, Rahoma A, Abualsaud R, Al-Thobity AM, Akhtar S, Helal MA, Al-Harbi FA. Impact of different surface treatments and repair material reinforcement on the flexural strength of repaired PMMA denture base material. Dent Mater J. 2020 Jun 5;39(3):471-82. [DOI:10.4012/dmj.2018-436] [PMID]
7. Elhadiry SS, Yunus N, Ariffin YT. Effect of cavity preparation on the flexural strengths of acrylic resin repairs. J Appl Oral Sci. 2010 Dec;18(6):546-50. [DOI:10.1590/S1678-77572010000600003] [PMID] [PMCID]
8. Galav A, Deogade SC, Mantri S, Sumathi K, Galav S. Effect of Water Storage on the Flexural Strength of Heat-cured Denture Base Resin Reinforced with Stick (s) Glass Fibers. Con-temp Clin Dent. 2017 Apr-Jun;8(2):264-71. [DOI:10.4103/ccd.ccd_157_17] [PMID] [PMCID]
9. Hemmati MA, Vafaee F, Allahbakhshi H. Water Sorption and Flexural Strength of Thermoplastic and Conventional Heat-Polymerized Acrylic Resins. J Dent (Tehran). 2015 Jul; 12(7):478-84.
10. Golbidi F, Mousavi T. Transverse strength of repaired den-ture base material with wire and two auto polymerized acrylic resin. Front Dent. 2007;4(4):183-7.
11. Zafar MS. Prosthodontic Applications of Polymethyl Meth-acrylate (PMMA): An Update. Polymers (Basel). 2020 Oct 8;12(10):2299. [DOI:10.3390/polym12102299] [PMID] [PMCID]
12. Raszewski Z, Nowakowska D, Wieckiewicz W, Nowakow-ska-Toporowska A. Release and Recharge of Fluoride Ions from Acrylic Resin Modified with Bioactive Glass. Polymers (Basel). 2021 Mar 27;13(7):1054. [DOI:10.3390/polym13071054] [PMID] [PMCID]
13. Al-Thobity AM. The Impact of Polymerization Technique and Glass-Fiber Reinforcement on the Flexural Properties of Denture Base Resin Material. Eur J Dent. 2020 Feb;14(1):92-99. [DOI:10.1055/s-0040-1701922] [PMID] [PMCID]
14. Hada T, Kanazawa M, Iwaki M, Katheng A, Minakuchi S. Com-parison of Mechanical Properties of PMMA Disks for Digitally Designed Dentures. Polymers (Basel). 2021 May 26;13(11):1745. [DOI:10.3390/polym13111745] [PMID] [PMCID]
15. Lee JH, Lee CJ, Lee HH. Adaptation accuracy and me-chanical properties of various denture base resins: a review. The Journal of the Korean dental asso-ciation. 2019;57(12):747-56.
16. Neshati A, Kouchak Dezfouli N, Sadafi M, Omidi S. Compressive Strength of Three Types of Heat-Cure Acrylic Resins:Acropars, Acrosun, and Meliodent. J Res Dent Maxiilofac Sci. 2021;6(4):14-17. [DOI:10.52547/jrdms.6.4.14]
17. Durkan R, Oyar P. Comparison of mechanical and dynamic mechanical behaviors of different dental resins pol-ymerized by different polymerization techniques. Niger J Clin Pract. 2018 Sep;21(9):1144-9. [DOI:10.4103/njcp.njcp_423_17] [PMID]
18. 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. Journal of Pharmacy & Bioallied Sciences. 2015; 7(Suppl 2): S461. [DOI:10.4103/0975-7406.163505] [PMID] [PMCID]
19. Bayraktar G, Guvener B, Bural C, Uresin Y. Influence of polymerization method, curing process, and length of time of storage in water on the residual methyl methacrylate content in dental acrylic resins. J Biomed Mater Res B Appl Bio-mater. 2006 Feb;76(2):340-5. [DOI:10.1002/jbm.b.30377] [PMID]
20. Choksi RH, Mody PV. Flexural properties and impact strength of denture base resins reinforced with micronized glass flakes. J Indian Prosthodont Soc. 2016 Jul-Sep; 16(3): 264-70. [DOI:10.4103/0972-4052.176532] [PMID] [PMCID]
21. Gad MM, Al-Thobity AM, Fouda SM, Näpänkangas R, Raustia A. Flexural and Surface Properties of PMMA Denture Base Mate-rial Modified with Thymoquinone as an Antifungal Agent. J Pros-thodont. 2020 Mar;29(3):243-50. [DOI:10.1111/jopr.12967] [PMID]
22. Somani MV, Khandelwal M, Punia V, Sharma V. The effect of incorporating various reinforcement materials on flexural strength and impact strength of polymethylmethacrylate: A meta-analysis. J Indian Prosthodont Soc. 2019 Apr-Jun; 19 (2):101-12. [DOI:10.4103/jips.jips_313_18] [PMID] [PMCID]
23. Sotto-Maior BS, Jóia FA, Meloto CB, Cury AA, Rizzatti-Barbosa CM. Effect of double flasking and investing methods on artificial teeth movement in complete dentures processing. Gerodontology. 2012 Jun;29(2):e435-9. [DOI:10.1111/j.1741-2358.2011.00494.x] [PMID]
24. Takahashi Y, Hamanaka I, Shimizu H. Flexural properties of denture base resins subjected to long-term water immersion. Acta Odontol Scand. 2013 May-Jul;71(3-4):716-20. [DOI:10.3109/00016357.2012.715196] [PMID]
25. Islam KZ, Moral MAA, Rahman MM. Effect of Curing Time on the Flexural Strength of Heat Cured Acrylic Resin. City Dental College Journal. 2012;9(2):15-8. [DOI:10.3329/cdcj.v9i2.12316]
26. Arikan A, Ozkan YK, Arda T, Akalin B. Effect of 180 days of water storage on the transverse strength of acetal resin denture base material. J Prosthodont. 2010 Jan;19(1):47-51. [DOI:10.1111/j.1532-849X.2009.00495.x] [PMID]
27. Khan AA, Fareed MA, Alshehri AH, Aldegheishem A, Alharthi R, Saadaldin SA, Zafar MS. Mechanical Properties of the Modified Denture Base Materials and Polymerization Meth-ods: A Systematic Review. Int J Mol Sci. 2022 May 20;23 (10):5737. [DOI:10.3390/ijms23105737] [PMID] [PMCID]
28. Agarwal B, Patel C, Kumar A, Singh B. Water Sorption and Solubility of Denture Base Resins-An Evaluation. Indian J Appl Res. 2015;5(8):41-4.
29. Lee HH, Lee JH, Yang TH, Kim YJ, Kim SC, Kim GR, Kim HR, Lee CJ, Okubo C. Evaluation of the flexural mechanical properties of various thermoplastic denture base polymers. Dent Mater J. 2018 Nov 30;37(6):950-6. [DOI:10.4012/dmj.2017-373] [PMID]
30. Silva AS, Carvalho A, Barreiros P, de Sá J, Aroso C, Mendes JM. Comparison of Fracture Resistance in Thermal and Self-Curing Acrylic Resins-An In Vitro Study. Polymers (Basel). 2021 Apr 11;13(8):1234. [DOI:10.3390/polym13081234] [PMID] [PMCID]
31. Fenlon MR, Juszczyk AS, Rodriguez JM, Curtis RV. Dimensional stability of complete denture permanent acrylic resin denture bases; A comparison of dimensions before and after a second curing cycle. Eur J Prosthodont Restor Dent. 2010 Mar;18(1):33-8. PMID: 20397501.
32. Silva-Concílio LR, Meloto CB, Neves AC, Cunha LG, Rizzatti-Barbosa CM. Influence of different flasking and polymerizing methods on the occlusal vertical dimension of complete dentures. Acta Odontol Latinoam. 2012;25(3):312-7.

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