Dentin shear strength: Effects of tubule orientation and intratooth location

Watanabe, Larry G.; Marshall, Grayson W.; Marshall, Sally J.

doi:10.1016/s0109-5641(96)80077-7

Cited by 141 publications

(96 citation statements)

References 12 publications

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“…Several testing configurations have been usedincluding loops, points, and knife edges -to apply shear force. However, a major problem with these methods lies in the difficulty of placing the shear loading device in close alignment with the bond interface 23) .…”

Section: Discussionmentioning

confidence: 99%

Effect of fiber-reinforced composite at the interface on bonding of resin core system to dentin

et al. 2008

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The aim of this study was to evaluate the effect of fiber-reinforced composite (FRC) at the interface on bonding of resin core systems to bovine dentin using different adhesive systems. To this end, the labial surfaces of 60 bovine incisors were ground to obtain flat dentin surfaces and then divided into two groups according to the adhesive system used: total-etching (Solobond Plus) versus self-etching (Clearfil SE Bond). Resin core systems were bonded to tooth structure either without or with a FRC layer (everStick Net, StickTech). For groups with FRC layer, a silicon forming aid was used to adapt the latter on the dentin surfaces. After resin core was polymerized with Optilux 501 for 40 seconds, the specimens were tested in a universal testing machine. ANOVA revealed that presence of FRC at the interface had a significantly positive effect on bond strength (p<0.001). However, differences between groups were not significant for either adhesive system (p = 0.076) or with the use of silicon forming aid (p = 0.348).

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Section: Discussionmentioning

confidence: 99%

Effect of fiber-reinforced composite at the interface on bonding of resin core system to dentin

et al. 2008

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“…35 The shear strength of dentin differs in the central and cusp areas and is dependent on dentinal tubule orientation in the central area. 36 However, tubule orientation has no appreciable effect on the elastic behavior of normal dentin, as intertubular dentin governs the elastic behavior of the dentin substrate. 37 Any increase in the elastic modulus is offset by the decrease in the volume fraction of the matrix phase.…”

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confidence: 99%

Bonding Efficacy of Single-step Self-etch Systems to Sound Primary and Permanent Tooth Dentin

Uekusa

Yamaguchi

Miyazaki

et al. 2006

Operative Dentistry

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Single-step self-etch systems are capable of producing a predictable bond to primary dentin, although the bond strength was found to be lower than permanent dentin. SUMMARYCurrently, there is little information regarding the bonding efficacy of single-step self-etch systems to primary tooth dentin. This study examined the microtensile bond strength of single-step self-etch systems (Clearfil tri-S Bond and One-Up Bond F Plus) to sound primary and permanent tooth dentin. Adhesives were applied to flat samples of primary and permanent tooth dentin, and resin composites were bonded according to the manufacturers' instructions. After 24 hours of storage in distilled water at 37°C, hour glass-shaped specimens were produced. They were subjected to microtensile testing at a crosshead speed of 1.0 mm/minute. The results were analyzed using 2-way analysis of variance (ANOVA) followed by the Tukey HSD post-hoc test (α α=0.05). Field-emission scanning electron microscopy (FE-SEM) observations of the adhesive-treated dentin surfaces and the resin/dentin interface were also conducted. The bond strengths of primary tooth dentin were significantly lower than that of permanent tooth dentin for both self-etch systems: 44.7 ± 10.4 versus 54.3 ± 9.0 MPa for Clearfil tri-S Bond and 40.6 ± 9.9 versus 50.0 ± 8.7 MPa for One-Up Bond F Plus (p<0.001). There was no statistically significant interaction between the type of adhesive system and the dentin substrate (p=0.957). Although there was no statistically significant difference in the mean values among the different adhesive systems (p=0.094), there was a statistically significant difference in mean values among the different dentin substrates (p<0.001), which were lower for primary tooth dentin than for permanent tooth Operative Dentistry dentin. The failure modes were also independent of the type of dentin but dependent on the adhesive systems, an equal distribution among the 3 types of failure for Clearfil tri-S Bond and cohesive failures in adhesives for One-Up Bond F Plus. FE-SEM observations of dentin to which adhesive had been applied revealed that the smear layer had been removed and the collagen fibers exposed. Though the bond strengths to primary tooth dentin were lower than to permanent tooth dentin, excellent adaptation of the single-step selfetch systems to both dentin substrates was observed by FE-SEM. Further studies are required to determine the long-term clinical performance of these adhesive systems when applied to primary tooth dentin.

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“…The largely longitudinally directed collagen fibers, found ubiquitously in the anterior zone of the loricariid flexible teeth, which is prone to tension during scraping, are interpreted here as an adaptation for increased tensile strength and crack prevention (Watanabe et al 1996). Ultimate tensile strength in human dentin has been found to be highest along the direction of collagen fibers (Miguez et al 2004).…”

Section: Discussionmentioning

confidence: 90%

“…Teeth are wonderfully adapted for this, as they contain hard, mineralized tissuesdentin, enamel, and enameloid-including the hardest biological materials nature has produced (Lund et al 1992;Currey 1999). The ordered microstructure of the hydroxyapatite crystals and the organic components of the enamel(oid) and the dentin contributes to the tooth strength by adding the minor but necessary degree of tensile and shear strength, directing forces and preventing cracks (Waters 1980;Watanabe et al 1996;Marshall et al 1997;Currey 1999;Kinney et al 2001;Mannocci et al 2004;Miguez et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Soft Dentin Results in Unique Flexible Teeth in Scraping Catfishes

Geerinckx¹,

Huysseune²,

Boone³

et al. 2012

Physiological and Biochemical Zoology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press ABSTRACTTeeth are generally used for actions in which they experience mainly compressive forces acting toward the base. The ordered tooth enamel(oid) and dentin structures contribute to the high compressive strength but also to the minor shear and tensile strengths. Some vertebrates, however, use their teeth for scraping, with teeth experiencing forces directed mostly normal to their long axis. Some scraping suckermouth catfishes (Loricariidae) even appear to have flexible teeth, which have not been found in any other vertebrate taxon. Considering the mineralized nature of tooth tissues, the notion of flexible teeth seems paradoxical. We studied teeth of five species, testing and measuring tooth flexibility, and investigating tooth (micro)structure using transmission electron microscopy, staining, computed tomography scanning, and scanning electron microscopy-energy-dispersive spectrometry. We quantified the extreme bending capacity of single teeth (up to 180Њ) and show that reorganizations of the tooth (micro)structure and extreme hypomineralization of the dentin are adaptations preventing breaking by allowing flexibility.Tooth shape and internal structure appear to be optimized for bending in one direction, which is expected to occur frequently when feeding (scraping) under natural conditions. Not all loricariid catfishes possess flexible teeth, with the trait potentially having evolved more than once. Flexible teeth surely rank among the most extreme evolutionary novelties in known mineralized biological materials and might yield a better understanding of the processes of dentin formation and (hypo)mineralization in vertebrates, including humans.

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Dentin shear strength: Effects of tubule orientation and intratooth location

Cited by 141 publications

References 12 publications

Effect of fiber-reinforced composite at the interface on bonding of resin core system to dentin

Effect of fiber-reinforced composite at the interface on bonding of resin core system to dentin

Bonding Efficacy of Single-step Self-etch Systems to Sound Primary and Permanent Tooth Dentin

Soft Dentin Results in Unique Flexible Teeth in Scraping Catfishes

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