Fracture Resistance and Toughening Mechanisms in Human Dentin: A Biomechanical Perspective

Petro  Mazur; Natalia  Markova; Iryna  Khodzinska; Anatolii  Savychuk

doi:10.32345/USMYJ.4(150).2024.30-35

Petro Mazur Department of Pediatric Dentistry, Shupyk National Healthcare University of Ukraine, Kyiv, Ukraine https://orcid.org/0009-0005-5012-5228
Natalia Markova Department of Pediatric Dentistry, Shupyk National Healthcare University of Ukraine, Kyiv, Ukraine https://orcid.org/0000-0002-1367-9580
Iryna Khodzinska Department of Pediatric Dentistry, Shupyk National Healthcare University of Ukraine, Kyiv, Ukraine https://orcid.org/0000-0003-3410-3043
Anatolii Savychuk Department of Pediatric Dentistry, Shupyk National Healthcare University of Ukraine, Kyiv, Ukraine https://orcid.org/0000-0002-0424-3590

DOI: https://doi.org/10.32345/USMYJ.4(150).2024.30-35

Keywords: Dentin; Biomechanical Phenomena; Physiology; Etiology; Treatment.

Abstract

fracture resistance in dentin is crucial for maintaining the structural integrity of a vital or endodontically treated tooth, particularly as aging and restorative interventions exacerbate mechanical vulnerabilities. This article explores the biomechanical properties of dentin, focusing on intrinsic toughening mechanisms such as crack deflection, bridging, and microcracking, which act to diminish crack propagation. The composite-like structure of dentin, comprising mineralized collagen fibrils within a heterogeneous matrix, facilitates a balance between stiffness and flexibility, resisting multiple cyclic loads under complex intraoral environments. The impact of dentin dehydration, age-related changes, and the formation of sclerotic dentin on fracture resistance in dentine is discussed. A thorough understanding of toughening mechanisms in dentin is essential for optimizing clinical approaches aiming to ensure the durable success of dental treatment.

References

Angker, L., Watson, P., Watson, J., Haake, S., & Miller, C. (2004). Correlating the mechanical properties to the mineral content of carious dentine—A comparative study using an ultra-micro indentation system (UMIS) and SEM-BSE signals. Archives of Oral Biology, 49(6), 369-378.

Arola, D., Gao, S., Zhang, H., & Masri, R. (2017). The tooth: Its structure and properties. Dental Clinics of North America, 61(4), 651-668. https://doi.org/10.1016/j.cden.2017.06.001

Bajaj, D. (2006). Age, dehydration, and fatigue crack growth in dentin. Biomaterials, 27(14), 2507-2517.

Berkovitz, B. K. B. (2002). Oral Anatomy, Histology, and Embryology (3rd ed.). Mosby.

Carter, J. M. (1983). Punch shear testing of extracted vital and endodontically treated teeth. Journal of Biomechanics, 16(10), 841-848.

Dietschi, D. (2007). Biomechanical considerations for the restoration of endodontically treated teeth: A systematic review of literature – Part 1. Quintessence International, 38(9), 735-747.

Dietschi, D. (2008). Biomechanical considerations for the restoration of endodontically treated teeth: A systematic review of literature – Part 2. Quintessence International, 39(2), 93-112.

Gao, H., Ji, B., Jager, I. L., Arzt, E., & Fratzl, P. (2003). Materials become insensitive to flaws at nanoscale: Lessons from nature. Proceedings of the National Academy of Sciences, 100(11), 5597-5600.

Gupta, H. S., Seto, J., Wagermaier, W., Zaslansky, P., Boesecke, P., & Fratzl, P. (2006). Cooperative deformation of mineral and collagen in bone at the nanoscale. Proceedings of the National Academy of Sciences, 103(47), 17741-17746. https://doi.org/10.1073/pnas.0604237103

Hayashi, M., Harada, A., & Tanaka, M. (2008). Static and fatigue fracture resistances of pulpless teeth restored with post–cores. Dental Materials, 24(12), 1178-1186.

Huang, T.-J. (1992). Effects of moisture content and endodontic treatment on some mechanical properties of human dentin. Journal of Endodontics, 18(5), 209-215.

Kahler, B. (2003). Fracture-toughening mechanisms responsible for differences in work to fracture of hydrated and dehydrated dentine. Journal of Biomechanics, 36(6), 229-237.

Kerekes, K., & Tronstad, L. (1979). Long-term results of endodontic treatment performed with a standard technique. Journal of Endodontics, 5(3), 83-86.

Kinney, J. H., Hauptfuehrer, J., Breunig, T. M., & Ritchie, R. O. (2004). Resonant ultrasound spectroscopy measurements of the elastic constants of human dentin. Journal of Biomechanics, 37(3), 437-441.

Kinney, J. H., Nalla, R. K., Pople, J. A., Breunig, T. M., & Ritchie, R. O. (2005). Age-related transparent root dentin: Mineral concentration, crystallite size, and mechanical properties. Biomaterials, 26(16), 3363-3376. https://doi.org/10.1016/j.biomaterials.2004.09.010

Kishen, A. (2006). Mechanisms and risk factors for fracture predilection in endodontically treated teeth. Endodontic Topics, 13, 57-83.

Kishen, A., & Asundi, A. (2001). Analysis on the nature of thermally induced deformation in human dentine by electronic speckle pattern interferometry (ESPI). Journal of Dentistry, 29(8), 531-537.

Kishen, A., & Vedantam, S. (2007). Hydromechanics in dentine: Role of dentinal tubules and hydrostatic pressure on mechanical stress–strain distribution. Dental Materials, 23(12), 1296-1306.

Koester, K. J. (2008). The effect of aging on crack-growth resistance and toughening mechanisms in human dentin. Biomaterials, 29(7), 1318-1328.

Kruzic, J. J., Nalla, R. K., Kinney, J. H., & Ritchie, R. O. (2003). Crack blunting, crack bridging and resistance-curve fracture mechanics in dentin: Effect of hydration. Biomaterials, 24(26), 5209-5221.

Nalla, R. K., & Kinney, J. H. (2003). Effect of orientation on the in vitro fracture toughness of dentin: The role of toughening mechanisms. Biomaterials, 24(24), 3955-3968.

Pathways of the Pulp. (2005). Mosby.

Pietrokovski, J., & Lantzman, E. (1973). Complicated crown fractures in adults. Journal of Prosthetic Dentistry, 30(4), 801-807.

Reeh, E. S. (1989). Reduction in tooth stiffness as a result of endodontic and restorative procedures. Journal of Endodontics, 15(11), 512-516.

Seltzer, S. (1999). Long-term radiographic and histological observations of endodontically treated teeth. Journal of Endodontics, 25(12), 820-828.

Tonami, K., & Takahashi, H. (1997). Effects of aging on tensile fatigue strength of bovine dentin. Dental Materials Journal, 16(2), 156-169.

United Nations. (2003). World population prospects: The 2002 revision. Volume II: Sex and age distribution of populations. New York: United Nations.

Van der Graaf, E. R., & Ten Bosch, J. J. (1990). The uptake of water by freeze-dried human dentine sections. Archives of Oral Biology, 35(9), 731-739.

Weber, D. F. (1974). Human dentine sclerosis: A microradiographic survey. Archives of Oral Biology, 19(2), 163-169.