World Journal of Dentistry

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VOLUME 9 , ISSUE 6 ( November-December, 2018 ) > List of Articles

ORIGINAL RESEARCH

Composite Diametral Tensile Strength

Ali AR Al-Shekhli, Isra'a Al Aubi

Keywords : Composite resin, Diametral tensile strength, Mechanical properties

Citation Information : Al-Shekhli AA, Aubi IA. Composite Diametral Tensile Strength. World J Dent 2018; 9 (6):457-461.

DOI: 10.5005/jp-journals-10015-1580

License: CC BY-NC 4.0

Published Online: 01-12-2018

Copyright Statement:  Copyright © 2018; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim: The aim of this study was to evaluate and compare the diametral tensile strength (DTS) of 4 types of composite materials including bulk fill type (tetric evo ceram) cured with two different curing intensities. Materials and methods: Four types of light-activated composite materials of A3 shade were selected for this study: Tetric Evo Ceram-Ivoclar Vivadent; Ceram X.mono- Dentsply; Nano Ceram-Bright-DMP; Estelite Sigma Quick-Tokuyama. Twenty specimens of each composite material were prepared: ten specimens were cured with high intensity 1200 mW/cm2 (n = 10) (high-intensity group) for 20 seconds and ten specimens were cured with low intensity 650 mW/cm2 (n = 10) (low intensity group) for 20 seconds. Specimens were prepared following the ISO 4049 and ADA/ANSI 27 Specifications in which cylindrical specimens (n = 20 of each material) of 4 mm in depth and 6 mm in diameter were prepared and stored in distilled water for 24 hours at 37°C. The DTS test was performed using the universal testing machine (Testometric/UK) with a crosshead speed of 1.0 mm/minute. The specimens were placed with their long axes perpendicular to the surface of the applied compressive load until failure. Values of the DTS in MPa were calculated and statistically analyzed by one way analysis of variance (ANOVA) and Tukey tests at 95% level of significance. Results: The mean of DTS in the high-intensity group ranged from 38.49 to 48.79 MPa, whereas the mean of DTS in the lowintensity group ranged from 24.58 to 38.15 MPa. The p values of statistical tests were all less than 0.05. One-way analysis of variance (ANOVA) tests for DTS values of all the four composite groups cured with high intensity at 1200 mW/cm2 and for DTS values of all the four composite groups cured with low intensity at 650 mW/cm2 revealed that there were statistically significant differences (p. 0.05). Conclusion: Within the limitations of the study we can conclude that high-intensity curing significantly resulted in higher DTS values in all the composites being tested in this study due to a better degree of conversion and composite composition also significantly influences its DTS values. Clinical significance: Diametral tensile strength (DTS) of any restorative material is an essential test that simulates the tensile behavior of the restorative material during function in the oral cavity which is an indicator for the general strength and durability of the restoration in oral service.


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  1. Casselli M, Worschech C, Paulillo L, Dias C. Diametral tensile strength of composite resins submitted to different activation techniques. Braz Oral Res 2006;20:214-218.
  2. Tolosa M, Paulillo L, Giannini M, Santos A, Dias C. Influence of composite restorative materials and light-curing units on diametrical tensile strength. Braz Oral Res 2005;19:123-126.
  3. Jacobs J, Lilly M, Coyte P. The fiscal impact of informal caregiving to home care recipients in Canada: how the intensity of care influences costs and benefits to government. Social Science & Medicine. 2013;81:102-109.
  4. Zimmerli B, Strub M, Jeger F, Stadler O, Lussi A. Composite materials: composition, properties and clinical applications. A literature review. SSO. 2010;120(11):972-986.
  5. Della A, Benetti P, Borba M, Cecchetti D. Flexural and diametral tensile strength of composite resins. Braz Oral Res. 2008; 22:84-89.
  6. Manhart J, Kunzelmann K, Chen H, Hickel R. Mechanical properties and wear behavior of light-cured packable composite resins. Dent Mater 2000;16(1):33-40.
  7. Koplin C, Rodriguez G, Jaeger R. Multiaxial strength and stress forming behavior of four light-curable dental composites. J. Res. Pract. Dent. 2014;396766.
  8. Takahashi H, Finger W, Endo T, Kanehira M, Koottathape N, Komatsu M, et al. Comparative evaluation of mechanical characteristics of nanofiller containing resin composites. American Journal of Dentistry. 2011;24(5):264-270.
  9. Moraes RR, Goncalves LD, Lancellotti AC, Consani S, Correr- Sobrinho L, Sinhoreti MA. Nanohybrid resin composites: nanofiller loaded materials or traditional microhybrid resins?. Operative dentistry. 2009;34(5):551-557..
  10. The future of composite technology: Scientific Documentation by Ivoclar Vivadent AG Research & Development Scientific Service Bendererstrasse 2 FL - 9494 Schaan Liechtenstein 2014:1-42.
  11. Burtscher P, Rheinberger V. Germanium based photoinitiator as an alternative to camphorquinone/amine. IADR Abstract 2008; 1611.
  12. Moszner N, Fischer U, Ganster B, Liska R, Rheinberger V. Benzoyl germanium derivatives as novel visible light photoinitiators for dental materials. Dent Mater. 2008;24(7): 901-907.
  13. Polydorou O, Manolakis A, Hellwig E, Hahn P. Evaluation of the curing depth of two translucent composite materials using a halogen and two LED curing units. Clin Oral Invest. 2008;12:45-51
  14. Rueggeberg F A, Caughman W F, Curtis J W. Effect of light intensity and exposure duration on cure of resin composites. Oper Dent 1994;19:26-32.
  15. Oberholzer T, Grobler S, Pameijer C, Hudson A. The effects of light intensity and method of exposure on the hardness of four light-cured dental restorative materials. International Dental Journal. 2003;53(4):211-215.
  16. Dennison J, Yaman P, Seir R, Hamilton J. Effect of variable light intensity on composite shrinkage. J Prosthet Dent 2000; 84(5):499-505.
  17. Asmussen E, Peutzfeldt A. Influence of UEDMA, BisGMA and TEGDMA on selected mechanical properties of experimental resin composites. Dent Mater. 1998;14(1):51-56.
  18. Bona AD, Benetti P, Borba M, Cecchett D. Flexural and diametral tensile strength of composite resins. Braz Oral Res 2008;22(1):84-89.
  19. Aguiar FH, Braceiro AT, Ambrosano GM, Lovadino JR. Hardness and diametral tensile strength of a hybrid composite resin polymerized with different modes and immersed in ethanol or distilled water media. Dent Mater. 2005; 21(12):1098-1103.
  20. Geirsson J, Bayne SC, Swift EJ Jr, Thompson JY. Mechanical property characterization of a novel directly-placed ceramic restorative material. Am J Dent. 2004;17(6):417-421
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