Flexural properties of acrylic bone cements

Knēts, Ivars; Krilova, Valentīna; Cimdiņš, Rūdolfs; Bērziņa, Līga; Vītiņš, Visvaldis

doi:10.1016/s0021-9290(06)84003-0

Cited by 1 publication

(2 citation statements)

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“…The flexural strength obtained above of 19 MPa is even lower as might be expected as it is generally closer to tensile rather than compressive strength. Evaluation of the mechanical properties, particularly the flexural strength and modulus of bone cements is a required step toward the development of bone cement with ideal properties . The flexure strength of P7L4DMA composite is significantly lower than that of PMMA (64 MPa) and dimethacrylate composites (Cortoss or Comp06) (45–65 MPa) .…”

Section: Discussionmentioning

confidence: 99%

“…Heat and shrinkage during cement polymerization also inhibits bonding . Flexural and compressive strength of set polymethylmethacrylate (PMMA) is adequate (≈50 and 75–105 MPa, respectively) for many clinical situations but reduced upon radio‐pacifier addition . PMMA high flexure modulus (≈2 GPa) unfortunately reduces micro‐motion required for bone healing .…”

Section: Introductionmentioning

confidence: 99%

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Brushite and Self‐Healing Flexible Polymer‐Modified Brushite Bone Adhesives for Fibular Osteotomy Repair

Neel

Salih

Revell³

et al. 2013

Adv Eng Mater

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The study aim was to compare in vitro properties of two experimental bone adhesives (brushite cement and polymer-modified brushite composite) and then assess their in vivo suitability for fixation of a fibular osteotomy using a lapine model. The composite was produced by replacement of the aqueous phase of the brushite cement (800 Â 10 À3 M citric acid) by polypropylene glycol-co-lactide dimethacrylate. FTIR showed this modification enabled pre-mixing and better control of set through light activated polymer crosslinking instead of the acid-base brushite reaction. Raman confirmed the brushite component [equimolar monocalcium phosphate (MCPM) and b-tricalcium phosphate (b-TCP)] of the composite could react upon water-sorption to enable long-term "bulk composite selfhealing." SEM demonstrated precipitation of brushite crystals in cell culture medium on the composite surface ("surface self-healing") and improved cell attachment. The composite was considerably more flexible than the cement (33% strain before yield compared to 4.6% before sharp brittle fracture). This flexibility was used to explain the more complete union of the fibula osteotomy and high callus index observed with composite use. The presence of cartilage at the osteotomy site in one fibula treated with brushite cement, however, indicated the absence of complete bone healing in this case. Raman mapping also confirmed the composite enabled more rapid mineralization of the fracture site compared with the cement. Both materials provided immediate fixation in vivo. More surprisingly both brushite and adhesive composite showed complete degradation by 5 weeks in vivo enabling complete union particularly with the adhesive composite within this time.

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Section: Discussionmentioning

confidence: 99%