Measurement at low strain rates of the elastic properties of dental polymeric materials

Chabrier, F; Lloyd, C.H.; Scrimgeour, S. N.

doi:10.1016/s0109-5641(99)00011-1

Cited by 40 publications

(32 citation statements)

References 10 publications

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“…In general, high loading rates eliminate the viscoelastic response of the polymeric adhesive to the applied load, inducing a stiff body response [6]. This inelastic response does not allow for absorption of the energy through elastic deformation, as occurs during slow loading [2].…”

Section: Diskussionmentioning

confidence: 99%

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Effect of Loading Rate on Bond Strength

et al. 2004

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The purpose of this study was to examine the effect of loading rate on the bond strength of brackets bonded to enamel. Forty premolars were used and brackets were bonded with a chemically cured or a light-cured adhesive, mounted on a testing machine, and debonded under shear stress at two loading velocities: a standard 1 mm/min, and a fast 200 mm/min which better approximates the actual jaw velocity during chewing. Bond strength results (N) were analyzed with two-way analysis of variance (loading rate, adhesive) (alpha = 0.05). An increased loading rate resulted in decreased bond strength, probably due to the induction of a stiff body response and elimination of the viscoelastic properties of the resin. The results indicated a similar effect on both chemically cured and light-cured adhesives, thus emphasizing the need for standardized test conditions in bond strength protocols. The implication of loads generated during chewing must be considered when estimating the long-term survival of the bond.

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Section: Diskussionmentioning

confidence: 99%

“…Generell eliminieren hohe Belastungsgrößen die viskoelastische Reaktion des polymeren Adhäsivs auf die angewandte Kraft und induzieren folglich eine Festkörperreaktion [6]. Diese unelastische Reaktion erlaubt keine Absorption der Energie durch elastische Deformation, wie sie bei langsamen Kräften stattfindet [2].…”

Section: Diskussionunclassified

Effect of Loading Rate on Bond Strength

et al. 2004

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“…35,36 The increase of 0.5 mm/min seems to be low to be related to the elimination of the viscoelastic response of the polymeric adhesive and a consequent induction of a stiff body response. 37 One suggestion is that, with 0.5 mm/ min speed, the chisel would be in contact with the body for a longer time, increasing the strains in the bond interface, whereas the contact period of the 1.0 mm/ min speed would be shorter, decreasing strain and thus increasing bond strength.…”

Section: Discussionmentioning

confidence: 99%

Orthodontic bracket bonding without previous adhesive priming: A meta-regression analysis

Altmann

Degrazia

Celeste

et al. 2015

The Angle Orthodontist

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Objective: To determine the consensus among studies that adhesive resin application improves the bond strength of orthodontic brackets and the association of methodological variables on the influence of bond strength outcome. Materials and Methods: In vitro studies were selected to answer whether adhesive resin application increases the immediate shear bond strength of metal orthodontic brackets bonded with a photo-cured orthodontic adhesive. Studies included were those comparing a group having adhesive resin to a group without adhesive resin with the primary outcome measurement shear bond strength in MPa. A systematic electronic search was performed in PubMed and Scopus databases. Results: Nine studies were included in the analysis. Based on the pooled data and due to a high heterogeneity among studies (I 2 5 93.3), a meta-regression analysis was conducted. The analysis demonstrated that five experimental conditions explained 86.1% of heterogeneity and four of them had significantly affected in vitro shear bond testing. The shear bond strength of metal brackets was not significantly affected when bonded with adhesive resin, when compared to those without adhesive resin. Conclusions: The adhesive resin application can be set aside during metal bracket bonding to enamel regardless of the type of orthodontic adhesive used. (Angle Orthod. 2016;86:391-398.)

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“…The elastic modulus can thus be determined from the slope of a stress/strain curve. Such relationship can be acquired by means of a uniaxial tensile test in the elastic regime (Chabrier et al, 1999). The modulus of elasticity is defined as:…”

Section: Methods For Obtaining Materials Properties Used In Feamentioning

confidence: 99%

“…The other mandatory property for a FEA, the Poisson's ratio, is the ratio of lateral contraction and longitudinal elongation of a material subjected to a uniaxial load (Chabrier et al, 1999). Among the static methods are tensile and compression tests, in which a uniaxial stress is applied to the material and the Poisson's ratio is calculated from the resulting axial and transverse strains.…”

Section: Methods For Obtaining Materials Properties Used In Feamentioning

confidence: 99%