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Which Bone Cement is Best?
Which Bone Cement is Best?
In order to properly attach spinal segments to our pot containers, bone cement must be used
There are many different kinds of bone cement on the market all with different material properties
We decided to evaluate 3 different materials to determine which material we should use for our prototype
Experimental Setup
Materials
3 materials were tested:
Smooth On 305
Smooth On 300
Bondo
Each material was relativley inexpensive, each cost less than $30
3 coupons of each material were made
What is a "coupon" and how are they made?
What is a "coupon" and how are they made?
A coupon is a small sample of material that will be tested in the Instron machine.
Coupons have a dog bone shape and are manufactured using a silicone mold (can be seen in the image on the right)
Uniaxial Tensile Testing
Mark-10 Instron machine was used to stretch materials samples while recording force.
2 dots were drawn on each coupon and the position of the dots were recorded throughout the test using a video
Each test ran until the coupon broke and they were pulled at a constant speed of 13mm/minute
Results
Nominal Stress and Strain were plotted
Smooth On 300 was determined to be the best material
Why Smooth on 300?
Why Smooth on 300?
The most desirable potting material would be strong without being brittle.
Bondo exhibited brittle behavior as it broke in its elatic region, and experienced no plastic deformation
Smooth On 305 is very ductile, undergoing the most elogation but the least amount of stress before failure
Smooth on 300 experienced some plastic deformation meaning that it is slightly ductile, and was able to withstand the most stress before failure
Smooth of 300 is the best material for potting because it can withstand the highest force before breaking but isn't brittle
Leader: Raphaelle Paracuellos
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