Comparative Evaluation of Flexural Strength of Two Newer Composite Resin Materials: An in Vitro Study

Akshata  Patil; Shashi Rashmi  Acharya; Kishore  Ginjupalli

Authors

Akshata Patil
Shashi Rashmi Acharya
Kishore Ginjupalli

Keywords:

Dental Materials, Composite Resins, Flexural Strength

Abstract

Objective: To evaluate in vitro the flexural strength of two newer composite resin materials. Material and Methods: Twenty-four samples were equally divided into two groups: G1 - Brilliant EverGlow and G2: Brilliant NG. The rectangular blocks of 25 mm in length, 2 mm in width and thickness were prepared from two composite materials. Blocks were created by applying composites to a customized split mold and formed between two parallel glass plates. Before light-curing, blocks were covered with Mylar strips and rinsed for 10 seconds in water. Subsequently, they were stored in distilled water for 24 hours at 37ºC and 100% humidity before testing. Each sample was placed within a suitable framework of aluminum. The length of gap between the support was 21 mm and the speed of crosshead at 1 mm/minute. The data were subjected to an independent t-test. The level of significance was set at p <0.05. Results: A less flexural strength was observed in G1 (77.43 Mpa) compared to G2 (118.70 Mpa) (p<0.001). Conclusion: Universal nanohybrid composite resin material was found to have greater flexural strength than universal submicron hybrid composite material.

References

Beun S, Glorieux T, Devaux J, Vreven J, Leloup G. Characterization of nanofilled compared to universal and microfilled composites. Dent Mater 2007; 23(1):51-9. https://doi.org/1016/j.dental.2005.12.003

Ikejima I, Nomoto R, McCabe JF. Shear punch strength and flexural strength of model composites with varying filler volume fraction, particle size and silanation. Dent Mater 2003; 19(3):206-11. https://doi.org/10.1016/s0109-5641(02)00031-3

George R. Nanocomposites: A review. J Dent Oral Biosc 2011; 2(3):38-40. https://doi.org/10.5368/JDOB/.2011.2.3.3.2

Fortin D, Vargas MA. The spectrum of composites: New techniques and materials. J Am Dent Assoc 2000; 131(Suppl):26S–30S. https://doi.org/10.14219/jada.archive.2000.0399

Chen MH, Chen CR, Hsu SH, Sun SP, Su WF. Low shrinkage light curable nanocomposite for dental restorative material. Dent Mater 2006; 22(2):138-45. https://doi.org/10.1016/j.dental.2005.02.012

Manhart J, Kunzelmann KH, Chen HY, Hickel R. Mechanical properties and wear behavior of light-cured packable composite resins. Dent Mater 2000; 16(1):33-40. https://doi.org/10.1016/s0109-5641(99)00082-2

Yap AU, Teoh SH. Comparison of flexural properties of composite restoratives using the ISO and mini-flexural tests. J Oral Rehabil 2003; 30(2):171-7. https://doi.org/10.1046/j.1365-2842.2003.01004.X

Eronat N, Candan U, Türkün M. Effects of glass fiber layering on the flexural strength of microfill and hybrid composites. J Esthet Restor Dent 2009; 21(3):171-8. https://doi.org/10.1111/j.1708-8240.2009.00259.x

Scribante A, Bollardi M, Chiesa M, Poggio C, Colombo M. Flexural properties and elastic modulus of different esthetic restorative materials: Evaluation after exposure to acidic drink. Biomed Res Int 2019; 2019:5109481. https://doi.org/10.1155/2019/109481

Scribante A, Massironi S, Pieraccini G, Vallittu P, Lassila L, Sfondrini MF, et al. Effects of nanofillers on mechanical properties of fiber-reinforced composites polymerized with light-curing and additional post curing. J Appl Biomater Funct Mater 2015; 13(3):e296-e299. https://doi.org/10.5301/jabfm.5000226

Sfondrini MF, Gandini P, Tessera P, Vallittu PK, Lassila L, Scribante A. Bending properties of fiber-reinforced composites retainers bonded with spot-composite coverage. Biomed Res Int 2017; 2017:8469090. https://doi.org/10.1155/2017/8469090

Rodrigues Junior SA, Zanchi CH, Carvalho RV, Demarco FF. Flexural strength and modulus of elasticity of different types of resin-based composites. Braz Oral Res 2007; 21(1):16-21. https://doi.org/10.1590/s1806-83242007000100003

Meenakumari C, Bhat KM, Bansal R, Singh N. Evaluation of mechanical properties of newer nanoposterior restorative resin composites: An In vitro study. Contemp Clin Dent 2018; 9(Suppl 1):S142-S146. https://doi.org/10.4103/ccd.ccd_160_18

Abouelleil H, Pradelle N, Villat C, Attik N, Colon P, Grosgogeat B, et al. Comparison of mechanical properties of a new fiber reinforced composite and bulk filling composites. Restor Dent Endod 2015; 40(4):262-70. https://doi.org/10.5395/rde.2015.40.4.262

Garoushi S, Säilynoja E, Vallittu PK, Lassila L. Physical properties and depth of cure of a new short fiber reinforced composite. Dent Mater 2013; 29(8):835-41. https://doi.org/10.1016/j.dental.2013.04.016

Finan L, Palin WM, Moskwa N, McGinley EL, Fleming GJ. The influence of irradiation potential on the degree of conversion and mechanical properties of two bulk-fill flowable RBC base materials. Dent Mater 2013; 29(8):906-12. https://doi.org/10.1016/j.dental.2013.05.008

International Organization for Standardization, Technical Committee. ISO 4049:2009. Dentistry — Polymer-Based Restorative Materials. 4th. ed. Geneva: ISO; 2009.

Goracci C, Cadenaro M, Fontanive L, Giangrosso G, Juloski J, Vichi A, et al. Polymerization efficiency and flexural strength of low-stress restorative composites. Dent Mater 2014; 30(6):688-94. https://doi.org/10.1016/j.dental.2014.03.006

Chung SM, Yap AU, Chandra SP, Lim CT. Flexural strength of dental composite restoratives: comparison of biaxial and three-point bending test. J Biomed Mater Res B Appl Biomater 2004; 71(2):278-83. https://doi.org/10.1002/jbm.b.30103

Hamouda I, Elkader HA. Evaluation the mechanical properties of nanofilled composite resin restorative material. J Biomater Nanobiotechnol 2012; 3:238-42. https://doi.org/10.4236/jbnb.2012.32029