Flexural strength of modified and unmodified acrylic denture base material after different processing techniques

Authors

  • Aisha Kiran Baqai Medical University
  • Faiza Amin Dow University of Health Sciences
  • Syed Junaid Mahmood Plastic and Polymer Section, PCSIR, Labs Complex, Karachi
  • Arif Ali Dow University of Health Sciences

Abstract

Objective: To determine and compare the effect of different processing techniques on flexural strength of modified and unmodified denture base acrylic resin. Air circulating oven is introduced for the first time in this study and its efficacy was also compared with other conventional processing techniques. Materials and Methods:  In this study total number of 114 rectangular specimens were fabricated by conventional heat cured acrylic (Stellon QC 20, Dentsply) for Group A (n=57), and rubber reinforced acrylic resin (High impact, Meadway) for Group B (n=57). Three equipments including water bath, dry oven and air circulating oven were utilized for processing specimens individually. Each sub-group of processing techniques (n=19), were tested for flexural strength through a three point bending test by a universal testing machine. The statistical analysis initiated with descriptive analysis followed by independent t test for mean comparison of flexural strength of all three processing techniques among both testing group.  1-way ANOVA and 2-way ANOVA followed by scheffe post hoc test were also applied. P-value of 0.05 or less was considered as significant. Results: Statically significant P-Value <0.001 was found in response of flexural strength in all processing techniques (water bath, dry oven, air circulating oven) of both testing groups. Water bath processing demonstrated highest flexural strength values in both denture base material used in this study. The unit used for flexural strength was MPa. Conclusion: This study manifested highest flexural strength in conventional and rubber reinforced heat cure samples when processed through water bath. Air circulating oven also presented acceptable flexural strength in conventional heat cure acrylic resin specimens when compared with other techniques.

Author Biographies

Aisha Kiran, Baqai Medical University

Senior Lecturer, Science of Dental Materials

Faiza Amin, Dow University of Health Sciences

Associate Professor, Supervisor MDS and M.Sc.

Syed Junaid Mahmood, Plastic and Polymer Section, PCSIR, Labs Complex, Karachi

Scientific Officer, Plastic and Polymer Section, PCSIR, Karachi

Arif Ali, Dow University of Health Sciences

Senior Lecturer, School of Public Health, DUHS, Karachi.

References

Khindria S, Mittal S, Sukhija U. Evolution of denture base materials. J Indian Prosthodont Soc 2009;9(2):64-69.

Kareem AE. Strength and Surface Roughness of Cross Linking Acrylic Resin Processed by Different Heat Curing Methods. Iraqi Dent J 2015;37(1):13-19.

Porwal A, Khandelwal M, Punia V, Sharma V. Effect of denture cleansers on color stability, surface roughness, and hardness of different denture base resins. J Indian Prosthodont Soc. 2017 Jan;17(1):61-67

Mohammed H et al., Comparison of the Flexural Strength and Surface Roughness of Conventional Heat Cure and High Impact Denture Base Resins on Microadditions of Carbon Nanotubes-An In Vitro Study. Int J Biomed Sci,2019,15(1):6-10.

Jagger, D et al., An investigation into the transverse and impact strength of high strength denture base acrylic resins. J Oral Rehabil, 2002. 29(3): p. 263-267.

Jaikumar, R.A et al., Comparison of flexural strength in three types of denture base resins: An in vitro study. J pharm Bioall Sci, 2015. 7(Suppl 2): p. 5461-5464.

Ahmed, M.A et al., Effect of titanium dioxide nano particles incorporation on mechanical and physical properties on two different types of acrylic resin denture base. WJNSE,2016. 6(03): p. 111-1119.

Arora SJ, Arora A, Upadhyaya V, Goyal A. Evaluation of the mechanical properties of high impact denture base resin with different polymer to monomer ratios: An In vitro study. Indian J Dent Sci, 2017;9(2):67-72.

Yazdanie, N. and M. Mahood, Carbon fiber acrylic resin composite: an investigation of transverse strength. J Pros Dent, 1985. 54(4): p. 543-547.

Yu, S.-H., et al., Reinforcing effects of different fibers on denture base resin based on the fiber type, concentration, and combination. Dental materials journal, 2012. 31(6): p. 1039-1046.

Banerjee, R., et al., Influence of the processing technique on the flexural fatigue strength of denture base resins: an in vitro investigation. Indian J Dent Resea,2010. 21(3): p. 391.

Mohamed, R., et al., A Comparitive Study on the Tensile Bond Strength of Conventional Denture Base Resin to Cross Linked Acrylic Tooth using two Different Curing Cycles–an invitro Study. Biomedical and Pharmacology Journal, 2017. 10(1): p. 447-454.

Ayaz, E.A., et al., Comparative effect of different polymerization techniques on residual monomer and hardness properties of PMMA-based denture resins. Journal of applied biomaterials & functional materials, 2014. 12(3): p. 228-233.

Fonseca, R.B., et al., The influence of polymerization type and reinforcement method on flexural strength of acrylic resin. The Scientific World Journal, 2015. 2015.

Seo, R.S., et al., Effect of a post-polymerization treatments on the

flexural strength and Vickers hardness of reline and acrylic denture base resins. Journal of Applied Oral Science, 2007. 15(6): p. 506-511.

Milena, K., et al., Effects of water boiling, microwave, and water bath post-polymerization on mechanical properties of acrylic denture resins. Hemijska Industrija, 2018. 72(3): p. 129.

Durkan, R., et al., In vitro comparison of autoclave polymerization on the transverse strength of denture base resins. Dental materials journal, 2008. 27(4): p. 640-642.

Nejatian, T., F. Sefat, and T. Johnson, Impact of Packing and Processing Technique on Mechanical Properties of Acrylic Denture Base Materials. Mater, 2015. 8(5): p. 2093-2109.

Urban, V.M., et al., Residual monomer of reline acrylic resins: Effect of water-bath and microwave post-polymerization treatments. dental materials, 2007. 23(3): p. 363-368.

Bonuso, J.L. and S.M. Swayne, Dual fan convection oven. 2012, Google Patents.

Anusavice, K.J., C. Shen, and H.R. Rawls, Phillips' science of dental materials. 2013: Elsevier Health Sciences.12th edition,pg59

Vallittu, P.K., V. Miettinen, and P. Alakuijala, Residual monomer content and its release into water from denture base materials. Dental Materials, 1995. 11(5-6): p. 338-342.

Rashid, A.A.-L., Temperature Effect on the Hardness of Different types of Resin Denture Base Materials. Mustansiriya Dental Journal, 2018. 10(1): p. 69-76.

Rodford, R., Further development and evaluation of high impact strength denture base materials. J Dent, 1990. 18(3): p. 151-157.

Naji, S.A., et al., Recent Advances and Future Perspectives for Reinforcement of Poly (methyl methacrylate) Denture Base Materials: A Literature Review. 2018. 5(1): p. 490-502.

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Published

2021-01-16