Evaluation of the Effect of Brushing on Vickers Microhardness of Acrylic Denture Base Resins Polymerized by Different Techniques
Abstract
Objectives: In selecting a denture base material, different polymerization techniques might be considered to avoid adverse effects of brushing on the microhardness of the acrylic resin. The purpose of this study was to evaluate the brushing effect on Vickers microhardness of acrylic denture base resins polymerized by different techniques.
Material and Methods: One hundred disk-shaped specimens (15 mm in diameter and 2 mm thick) were fabricated from each acrylic resin (Integra and FuturaJet). Five different polymerization techniques were tested (n=20): conventional water-bath polymerization, short autoclave polymerization (60°C for 30 minutes, then 130°C for 10 minutes), long autoclave polymerization (60°C for 30 minutes, then 130°C for 20 minutes), injection-molding polymerization and auto-polymerization. Half of the specimens were subjected to simulated brushing in an automatic brushing machine using 54 000 brush strokes for each specimen. All specimens were then submitted to Vickers hardness test with a 300-g load for 15 s. Mann Whitney U test and Kruskal-Wallis test followed by Dunn’s post-hoc test were used for results analysis, which were statistically significant at p < 0.05.
Results: A statistically significant difference was observed between the control and brushing groups in all polymerization techniques (p < 0.05). Autopolymerized acrylic resin group showed significantly lower microhardness values than water bath, short and long autoclave polymerized resins in control and brushing groups (p < 0.05).
Conclusions: Autopolymerization technique might has some disadvantages on avoid adverse effects of brushing on the microhardness, therefore tehniques of polymerization should be considered as microhardness of acrylic denture base resins.
Keywords
References
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- 25. Bahrani F, Safari A, Vojdani M, Karampoor G, Patil SJWJD. Comparison of hardness and surface roughness of two denture bases polymerized by different methods. World Journal of Dentistry 2012;3:171-175.
- 26. Abdulwahhab SS. High‑impact strength acrylic denture base material processed by autoclave. J Prosthodont Res 2013;57:288‑293.
- 27. Gad MM, Rahoma A, Al-Thobity AM. Effect of polymerization technique and glass fiber addition on the surface roughness and hardness of PMMA denture base material. Dent Mater J 2018;37:746-753.
- 28. Axe AS, Varghese R, Bosma M, Kitson N, Bradshaw DJ. Dental health professional recommendation and consumer habits in denture cleansing. J Prosthet Dent 2016;115:183-188.
- 29. Jagger R. Lack of evidence about the effectiveness of the different denture cleaning methods. Evid Based Dent 2009;10:109.
- 30. Meng TR, Latta MA. Physical properties of four acrylic denture base resins. J Contemp Dent Pract 2005;6:93-100.
- 31. Freitas-Pontes KM, Silva-Lovato CH, Paranhos HF. Mass loss of four commercially available heat-polymerized acrylic resins after toothbrushing with three different dentifrices. J Appl Oral Sci 2009;17:116-121.
Abstract
References
- 1. Salles AE, Macedo LD, Fernandes RA, Silva-Lovato CH, Paranhos Hde F. Comparative analysis of biofilm levels in complete upper and lower dentures after brushing associated with specific denture paste and neutral soap. Gerodontology 2007;24:217-223.
- 2. Gornitsky M, Paradis I, Landaverde G, Mallo AM, Velly AM. A clinical and microbiological evaluation of denture cleansers for geriatric patients in long term care institutions. J Can Dent Assoc 2002;68:39-45.
- 3. Paranhos HFO, Silva-Lovato CH, Souza RF, Cruz PC, Freitas KM, Peracini A. Effects of mechanical and chemical methods on denture biofilm accumulation. J Oral Rehabil 2007;34:606-612.
- 4. Dhir G, Berzins DW, Dhuru VB, Periaathamby AR, Dentino A. Physical properties of denture base resins potentially resistant to Candida adhesion. J Prosthodont 2007;16:465-472.
- 5. Felton D, Cooper L, Duqum I, Minsley G, Guckes A, Haug S, et al. Evidence-based guidelines for the care and maintenance of complete dentures: a publication of the American College of Prosthodontists. J Prosthodont 2011;20:S1-S12.
- 6. de Souza RF, de Freitas Oliveira Paranhos H, Lovato da Silva CH, Abu-Naba'a L, Fedorowicz Z, Gurgan CA. Interventions for cleaning dentures in adults. Cochrane Database Syst Rev 2009;4:CD007395.
- 7. Panzeri H, Lara EH, Paranhos HFO, Silva-Lovato CH, Souza RF, de Souza Gugelmin MC, et al. In vitro and clinical evaluation of specific dentifrices for complete denture hygiene. Gerodontology 2009;26:26-33.
- 8. de Freitas Pontes KM, de Holanda JC, Fonteles CS, Pontes Cde B, Lovato da Silva CH, Paranhos Hde F. Effect of toothbrushes and denture brushes on heat-polymerized acrylic resins. Gen Dent 2016;64:49-53.
- 9. Richmond R, Macfarlane TV, McCord JF. An evaluation of the surface changes in PMMA biomaterial formulations as a result of toothbrush/dentifrice abrasion. Dent Mater 2004;20:124-132.
- 10. Farina AP, Cecchin D, Soares RG, Botelho AL, Takahashi JM, Mazzetto MO, Mesquita MF. Evaluation of Vickers hardness of different types of acrylic denture base resins with and without glass fibre reinforcement. Gerodontology 2012;29:155-160.
- 11. Khan AA, Fareed MA, Alshehri AH, Aldegheishem A, Alharthi R, Saadaldin SA, et al. Mechanical Properties of the Modified Denture Base Materials and Polymerization Methods: A Systematic Review. Int J Mol Sci 2022;23:5737.
- 12. Ayaz EA, Durkan R, Koroglu A, Bagis B. Comparative effect of different polymerization techniques on residual monomer and hardness properties of PMMA-based denture resins. J Appl Biomater Funct Mater 2014;12:228-233.
- 13. Gay WD, King GR. An evaluation of the cure of acrylic resins used in dental prosthesis. J Prosthet Dent 1979;42:437–440.
- 14. Gharechahi J, Asadzadeh N, Shahabian F, Gharechahi M. Dimensional changes of acrylic resin denture bases: conventional versus injection-molding technique. J Dent (Tehran) 2014;11:398-405.
- 15. Pinto LR, Acosta EJTR, Ta´vora FFF, Silva PMB, Carvalho V. Effect of repeated cycles of chemical disinfection on the roughness and hardness of hard reline acrylic resins. Gerodontology 2010;27:147-153.
- 16. Peutzfeldt A, Garcia-Godoy F, Asmussen E. Surface hardness and wear of glass ionomers and compomers. Am J Dent 1997;10:15-17.
- 17. Wojda SM, Sajewicz E. Influence of dental materials on hardness and Young's modulus of the surface layers of tooth enamel formed as a result of friction. Acta Bioeng Biomech 2019;21:129-139.
- 18. Anusavice KJ, Phillips RW. Phillip’s science of dental materials. 11th ed. St Louis: Elsevier; 2003. p.33-47.
- 19. Prakki A, Cilli R, de Araújo PA, Navarro MF, Mondelli J, Mondelli RF. Effect of toothbrushing abrasion on weight and surface roughness of pH-cycled resin cements and indirect restorative materials. Quintessence Int 2007;38:544-554.
- 20. Çakmak G, Donmez MB, Akay C, Abou-Ayash S, Schimmel M, Yilmaz B. Effect of Thermal Cycling on the Flexural Strength and Hardness of New-Generation Denture Base Materials. J Prosthodont 2023;32:81-86.
- 21. Ayaz EA, Bağış B, Turgut S. Effects of thermal cycling on surface roughness, hardness and flexural strength of polymethylmethacrylate and polyamide denture base resins. J Appl Biomater Funct Mater 2015;13:e280-286.
- 22. International Organization for Standardization. Technical Specification 14569-1. Dental Materials – Guidance on testing of wear resistance – Part 1: Wear by tooth brushing. Geneva, ISO;1999.
- 23. Batisse C, Nicolas E. Comparison of CAD/CAM and conventional denture base resins: A systematic review. Appl. Sci. 2021;11:5990.
- 24. Perea-Lowery L, Gibreel M, Vallittu PK, Lassila LV. 3D-Printed vs. Heat-Polymerizing and Autopolymerizing Denture Base Acrylic Resins. Materials 2021;14:5781.
- 25. Bahrani F, Safari A, Vojdani M, Karampoor G, Patil SJWJD. Comparison of hardness and surface roughness of two denture bases polymerized by different methods. World Journal of Dentistry 2012;3:171-175.
- 26. Abdulwahhab SS. High‑impact strength acrylic denture base material processed by autoclave. J Prosthodont Res 2013;57:288‑293.
- 27. Gad MM, Rahoma A, Al-Thobity AM. Effect of polymerization technique and glass fiber addition on the surface roughness and hardness of PMMA denture base material. Dent Mater J 2018;37:746-753.
- 28. Axe AS, Varghese R, Bosma M, Kitson N, Bradshaw DJ. Dental health professional recommendation and consumer habits in denture cleansing. J Prosthet Dent 2016;115:183-188.
- 29. Jagger R. Lack of evidence about the effectiveness of the different denture cleaning methods. Evid Based Dent 2009;10:109.
- 30. Meng TR, Latta MA. Physical properties of four acrylic denture base resins. J Contemp Dent Pract 2005;6:93-100.
- 31. Freitas-Pontes KM, Silva-Lovato CH, Paranhos HF. Mass loss of four commercially available heat-polymerized acrylic resins after toothbrushing with three different dentifrices. J Appl Oral Sci 2009;17:116-121.
Details
| Primary Language | English |
|---|---|
| Subjects | Health Care Administration |
| Journal Section | Original Research Articles |
| Authors | |
| Publication Date | September 29, 2023 |
| Submission Date | February 27, 2023 |
| Published in Issue | Year 2023 |
Cumhuriyet Dental Journal (Cumhuriyet Dent J, CDJ) is the official publication of Cumhuriyet University Faculty of Dentistry. CDJ is an international journal dedicated to the latest advancement of dentistry. The aim of this journal is to provide a platform for scientists and academicians all over the world to promote, share, and discuss various new issues and developments in different areas of dentistry. First issue of the Journal of Cumhuriyet University Faculty of Dentistry was published in 1998. In 2010, journal's name was changed as Cumhuriyet Dental Journal. Journal’s publication language is English.
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