7-17. The PMMA of Company A is used to make bone cement A. powdered PMMA D. N,N-

Question

7-17. The PMMA of Company A is used to make bone cement A. powdered PMMA D. N,N-dimethyl-p-toluidine F. monomer liquid B. benzoyl peroxide C.TO, E. hydroquinone, a. Which material is used for the initiator of polymerization? b. Which material is used for the accelerator of polymerization? c. Which material is used for the inhibitor of polymerization? d. Which material is used for the radio-opacifier of bone cement? e. What chemicals (two) can be put together with liquid monomer? f. What is the powder: liquid ratio for ordinary bone cement? fomationf pors in the bone cement.

Explanation / Answer

Initiator, such as benzoyl peroxide (BPO)

Accelerator (N,N-Dimethyl para-toluidine) (DMPT)

Inhibitor hydroquinone

radiopaque TiO2

PMMA bone cements are usually supplied as two-component systems made up of a powder and a liquid

When the copolymer powder is mixed with the MMA monomer liquid, polymerization occurs and PMMA bone cement is created.. Ratio is 2 : 1

Copolymers is the substance polymethylmethacrylate (PMMA)

monomer is methylmethacrylate (MMA

Sources of porosity

1 Trapped air between the powder beads as the powder is wetted

2 Trapped air in the cement during mixing.

3 Trapped air in the cement during transfer from mixing container to application device.

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