Related Experiment Video
Updated: Apr 30, 2026
11:51
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
14.8K
Material Mismatch Effect on the Fracture of a Bone-Composite Cement Interface
1Department of Engineering and Physics, University of Central Oklahoma, Edmond, Oklahoma.
Advances in Materials Science and Applications
|April 25, 2014
Summary
Bone orientation significantly impacts bone-cement bonding strength. Magnesium oxide (MgO) additives in polymethyl methacrylate (PMMA) bone cement did not affect this bonding strength, despite altering cement properties.
Area of Science:
- Biomaterials Science
- Orthopedic Engineering
- Materials Science
Background:
- Bone-implant interface mechanics are crucial for implant fixation and bone defect repair.
- Previous work indicated MgO particles enhance bone-cement fracture toughness.
- Material mismatch between bone and implants can affect bonding strength.
Purpose of the Study:
- To investigate the influence of bone orientation and MgO in PMMA bone cement on bone-cement interface strength.
- To evaluate the mechanical properties of PMMA bone cement with and without MgO additives.
- To determine the effect of material mismatch on interfacial mechanics.
Main Methods:
- Bovine cortical bone (longitudinal and transverse orientations) and PMMA bone cement with/without MgO were used.
- Bending strength and modulus of bone and cement specimens were measured.
- Interface strength between bone and PMMA specimens was assessed.
Main Results:
- Bone orientation significantly affected the bonding strength between bone and PMMA cement (P<0.05).
- MgO additives reduced the bending strength and modulus of PMMA bone cement.
- MgO inclusion in PMMA bone cement did not significantly alter the bonding strength with bone (P>0.05).
Conclusions:
- Bone orientation is a critical factor in bone-PMMA cement interfacial strength.
- While MgO alters PMMA properties, it does not significantly influence the bone-cement interface strength in this study.
- Further research may explore alternative MgO applications or other additives for improved bone-implant interfaces.
Related Concept Videos
01:20Microcracking in Concrete
614
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
614
01:23Behavior of Concrete Under Compressive Load
949
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
949
01:16Tensile Strength Considerations of Concrete
1.7K
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen...
The dimensions and shape of a concrete specimen...
1.7K
01:27Fractures: Bone Repair
5.8K
Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
5.8K
01:20Strength of Cement
910
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
910
01:24Stress-Strain Diagram - Brittle Materials
4.5K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
4.5K