Keywords
Materials testing
Stress, mechanical
Flexural strength.
How to Cite
Abstract
Aim: This study evaluated the fracture load and pattern failure of different prefabricated glass fiber posts (GFPs) of the same diameter. Methods: Seventy-eight (n=13 for six groups) GFPs of 1.6 mm coronal diameter of different brands were evaluated— Exacto (Angelus), Power Post (BM4), White Post DC (FGM), HiRem (Overfibers), MAQ (Maquira), and SD (Supordont). The posts were subjected to fracture load testing (45° of inclination and 1 mm/min until fracture). Each factor (load (N) and shear stress (MPa)) was analyzed separately using one-way ANOVA followed by the Tukey test (α=0.05). Results: The type of failure was evaluated on a stereomicroscope (×10). The Power Post samples presented higher values of fracture load (p<0.001) followed by Maquira fiber post, White Post , HiRem, Superpost, and the Exacto posts. The failure pattern observed was intralaminar mode II in-plane shear, such as a failure occur parallel to fibers. Conclusion: Despite the same diameter of GFPs, the fracture load and shear resistance were brand-dependent.
References
Assif D, Gorfil C. Biomechanical considerations in restoring endodontically treated teeth. J Prosthet Dent. 1994;71:565-7. doi:10.1016/0022-3913(94)90438-3.
Baldissara P. Mechanical properties and in vitro studies. In: Ferrari M, Scotti R, editors. Fiber Posts: characteristic and clinical aplication. Milan: Masson; 2003. p. 39-51.
Newman MP, Yaman P, Dennison J, Rafter M, Billy E. Fracture resistance of endodontically treated teeth restored with composite posts. J Prosthet Dent. 2003 Apr;89(4):360-7. doi:10.1067/mpr.2003.75.
Vallittu PK. Curing of a silane coupling agent and its effect on the transverse strength of autopolymerizing polymethylmethacrylate-glass fibre composite. J Oral Rehabil. 1997 Feb;24(2):124-30.
Bergoli CD, Brondani LP, Wandscher VF, Pereira G, Cenci MS, Pereira-Cenci T, et al. A multicenter randomized double-blind controlled clinical trial of fiber post cementation strategies. Oper Dent. 2018 Mar/Apr;43(2):128-35. doi:10.2341/16-278-C.
Gómez-Polo M, Llidó B, Rivero A, Del Río J, Celemín A. A 10-year retrospective study of the survival rate of teeth restored with metal prefabricated posts versus cast metal posts and cores. J Dent. 2010;38:916-20. doi:10.1016/j.jdent.2010.08.006.
Sarkis-Onofre R, Fergusson D, Cenci MS, Moher D, Pereira-Cenci T. Performance of post-retained single crowns: a systematic review of related risk factors. J Endod. 2017;43:175-83. doi:10.1016/j.joen.2016.10.025.
Lassila LVJ, Tanner J, Le Bell A-M, Narva K, Vallittu PK. Flexural properties of fiber reinforced root canal posts. Dent Mater. 2004 Jan;20(1):29-36.
Vallittu PK. The effect of glass fiber reinforcement on the fracture resistance of a provisional fixed partial denture. J Prosthet Dent. 1998 Feb;79(2):125-30.
Seefeld F, Wenz H-J, Ludwig K, Kern M. Resistance to fracture and structural characteristics of different fiber reinforced post systems. Dent Mater. 2007 Mar;23(3):265-71. doi:10.1016/j.dental.2006.01.018.
Söderholm KJ, Shang SW. Molecular orientation of silane at the surface of colloidal silica. J Dent Res. 1993;72(6):1050–4. doi:10.1177/00220345930720061001.
Wandscher VF, Bergoli CD, de Oliveira AF, Kaizer OB, Souto Borges AL, Limberguer IF, et al. Fatigue surviving, fracture resistance, shear stress and finite element analysis of glass fiber posts with different diameters. J Mech Behav Biomed Mater. 2015 Mar;43:69-77. doi:10.1016/j.jmbbm.2014.11.016.
Wandscher V, Bergoli C, Limberger I, Cenci T, Baldissara P, Valandro L. Fractographical analysis and biomechanical considerations of a tooth restored with intracanal fiber post: report of the fracture and importance of the fiber arrangements. Oper Dent. 2016;41:E149-58. doi:10.2341/15-262-S.
Marchionatti AME, Wandscher VF, Broch J, Bergoli CD, Maier J, Valandro LF, et al. Influence of periodontal ligament simulation on bond strength and fracture resistance of roots restored with fiber posts. J Appl Oral Sci. 2014 Sep-Oct;22(5):450-8.
Pereira GKR, Lançanova M, Wandscher VF, Kaizer OB, Limberger I, Özcan M, et al. Fiber-matrix integrity, micromorphology and flexural strength of glass fiber posts: evaluation of the impact of rotary instruments. J Mech Behav Biomed Mater. 2015;48:192-9. doi:10.1016/j.jmbbm.2015.04.008.
Wandscher V, Bergoli C, Limberger I, Ardenghi T, Valandro L. Preliminary results of the survival and fracture load of roots restored with intracanal posts: weakened vs nonweakened roots. Oper Dent. 2014;39:541-55. doi:10.2341/12-465.
Asmussen E, Peutzfeldt A, Heitmann T. Stiffness, elastic limit, and strength of newer types of endodontic posts. J Dent. 1999;27(4):275-8.
Grandini S, Goracci C, Monticelli F, Tay FR, Ferrari M. Fatigue resistance and structural characteristics of fiber posts: three-point bending test and SEM evaluation. Dent Mater. 2005;21(2):75-82. doi:10.1016/j.dental.2004.02.012.
Monticelli F, Toledano M, Osorio R, Ferrari M. Effect of temperature on the silane coupling agents when bonding core resin to quartz fiber posts. Dent Mater. 2006;22:1024-8. doi:10.1016/j.dental.2005.11.024.
Obukuro M, Takahashi Y, Shimizu H. Effect of diameter of glass fibers on flexural properties of fiber-reinforced composites. Dent Mater J. 2008;27(4):541-8.
Cheleux N, Sharrock PJ. Mechanical properties of glass fiber-reinforced endodontic posts. Acta Biomater. 2009;5(8):3224-30. doi:10.1016/j.actbio.2009.04.008.
Cohen BI, Deutsch AS, Musikant BL. Cyclic fatigue testing of six endodontic post systems. J Prosthodont. 1993;2(1):28-32.
Wiskott HW, Nicholls JI, Belser UC. Stress fatigue: basic principles and prosthodontic implications. Int J Prosthodont. 1995;8(2):105-16.
The Brazilian Journal of Oral Sciences uses the Creative Commons license (CC), thus preserving the integrity of the articles in an open access environment.
Downloads
