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Structure-Property Relations and Crack Resistance at the Bovine Dentin-Enamel Junction
C.P. Lin
Minnesota Dental Research Center for Biomaterials and Biomechanics, Department of Oral Science, School of Dentistry, University of Minnesota, Minneapolis, Minnesota 55455
W.H. Douglas
Minnesota Dental Research Center for Biomaterials and Biomechanics, Department of Oral Science, School of Dentistry, University of Minnesota, Minneapolis, Minnesota 55455
The present report is a study of the fracture behavior of the dentin-enamel complex, involving enamel, dentin, and the dentin-enamel junction (DEJ), that combines experimental design, computational finite element analysis, and fractography. Seven chevron-notched short-bar bovine DEJ specimens were utilized in this study. The general plane of the DEJ was approximately perpendicular to the fracture plane. All specimens were stored at 37°C and 100% relative humidity for 24 h prior to being tested. A fracture test set-up was designed for application of tensile load on the DEJ specimens to initiate a crack at the vertex of the chevron in the enamel, across the DEJ zone and into the bulk dentin. During fracture testing, a water chamber was used to avoid dehydration of the specimen. The results showed that the lower boundary value of the fracture toughness of the DEJ perpendicular to its own plane was 3.38 ± 0.40 MN/m1.5 and 988.42 ± 231.39 J/m2, in terms of KIC and GIC, respectively. In addition, there was an extensive plastic deformation (83 ± 12%) collateral to the fracture process at the DEJ zone. The fractography revealed that the deviation of the crack path involved an area which was approximately 50-100 µm deep. The parallel-oriented coarse collagen bundles with diameters of 1-5 µm at the DEJ zone may play a significant role in resisting the enamel crack. This reflects the fact, that in the intact tooth, the multiple full thickness cracks commonly found in enamel do not typically cause total failure of the tooth by crack extension into the dentin.
Key Words: Collagen • Fractures • Dentin Enamel Junction • Interface.
REFERENCES
- Aquilino SA, Williams VD, Svare CW (1987). The effect of storage solutions and mounting media on the bond strengths of a dentinal adhesive to dentin. Dent Mater 3:131-135.[Medline]
[Order article via Infotrieve]
- Barker LM (1979). Theory for determining KIC from small, non-LEFM specimens, supported by experiments on aluminum. Int J Fracture 15:515-536.
- Bishop MA, Malhotra M., Yoshida S. (1991). Interodontoblastic collagen (von Korff fibers) and circumpulpal dentin formation: an ultrathin serial section study in the cat. Am J Anat 191:67-73.[Medline]
[Order article via Infotrieve]
- Boyde A. (1985). Anatomical considerations relating to tooth preparation. In: Posterior composite resin dental restorative materials. Vanherle G, Smith DC, editors. Utrecht, The Netherlands: Peter Szulc, pp. 377-403.
- Boyde A. (1989). Enamel. In: Teeth. Berkovitz BKB, Boyde A, Frank RM, Höhling HJ, Moxham BJ, Nalbandian J, et al., editors. New York: Springer-Verlag, pp. 309-473.
- Boyde A., Fortelius M., Lester KS, Martin LB (1988). Basis of the structure and development of mammalian enamel as seen by scanning electron microscopy. Scanning Microscopy 2:1479-1490.[Medline]
[Order article via Infotrieve]
- El Mowafy OM, Watts DC (1986). Fracture toughness of human dentin. J Dent Res 65:677-681.
- Frazier PD (1968). Adult human enamel: an electron microscopic study of crystallite size and morphology. J Ultrastruct Res 22:1-11.[Medline]
[Order article via Infotrieve]
- Gere JM, Timoshenko SP (1990). Mechanics of materials. 3rd rev. ed. Boston, MA: PWS-KENT, pp. 301-308.
- Hassan R., Caputo AA, Bunshah RF (1981). Fracture toughness of human enamel. J Dent Res 60:820-827.
- He MY, Evans AG (1992). Three-dimensional finite element analysis of chevron-notched, three-point and four-point bend specimens. In: Fracture mechanics: twenty-second symposium (volume I). Ernst HA, Saxena A, McDowell DL, editors. Philadelphia, PA: ASTM STP 1131, pp. 471-484.
- Jongebloed WL, Molenaar I., Arends J. (1975). Morphology and size distribution of sound and acid-treated enamel crystals. Calcif Tissue Res 19:109-123.[Medline]
[Order article via Infotrieve]
- Kinloch AJ (1990). Adhesion and adhesives: science and technology. New York: Chapman and Hall, pp. 264-338.
- Lester KS, Boyde A. (1968). The question of von Korff fibers in mammalian dentine. Calcif Tissue Res 1:273-287.[Medline]
[Order article via Infotrieve]
- Lin CP (1993). Structure-property-function relationships in the dentin-enamel complex and tooth-restoration interfaces (dissertation). Minneapolis, MN: Univ. of Minnesota.
- Lin CP, Douglas WH, Erlandsen SL (1993). Scanning electron microscopy of type I collagen at the dentin-enamel junction of human teeth. J Histochem Cytochem 41:381-388.[Abstract]
- Newman JC Jr (1984). A review of chevron-notched fracture specimens. In: Chevron-notched specimens: testing and stress analysis. Underwood JH, Freiman SW, Baratta FI, editors. Philadelphia, PA: ASTM STP 855, pp. 5-31.
- Ouchterlony F. (1985). Evaluation formulas for rock fracture toughness testing with standard core specimens. Stockholm, Sweden: Swedish Detonic Research Foundation; SveDeFo Report DS 1985:2.
- Raju IS, Newman JC Jr (1984). Three-dimensional finite-element analysis of chevron-notched fracture specimens. In: Chevron-notched specimens: testing and stress analysis. Underwood JH, Freiman SW, Baratta FI, editors. Philadelphia, PA: ASTM STP 855, pp. 32-48.
- Rasmussen ST (1984). Fracture properties of human teeth in proximity to the dentino-enamel junction. J Dent Res 63:1279-1283.
- Rasmussen ST, Patchin RE (1984). Fracture properties of human enamel and dentin in an aqueous environment. J Dent Res 63:1362-1368.
- Rasmussen ST, Patchin RE, Scott DB, Heuer AH (1976). Fracture properties of human enamel and dentin. J Dent Res 55:154-164.
- Ten Cate AR (1989). Oral histology: development, structure and function. 3rd ed. St. Louis, MO: Mosby, pp. 213-227.
- Whittaker DK (1978). The enamel-dentine junction of human and Macaca irus teeth: a light and electron microscopic study. J Anat 125:323-335.[Medline]
[Order article via Infotrieve]
- Whittaker DK, Adams D. (1972). Electron microscopic studies on von Korff fibers in the human developing tooth. Anat Rec 174:175-190.[Medline]
[Order article via Infotrieve]
Journal of Dental Research, Vol. 73, No. 5,
1072-1078 (1994)
DOI: 10.1177/00220345940730050901
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