The cross linking agent of polysulphide rubber base impression material is______________?
Correct answer: D. Lead dioxide
- A. Aromatic sulfonate esters
- B. Stannous octate
- C. Platinum salt catalyst
- D. Lead dioxide
Explanation
Lead dioxide oxidizes the terminal sulfhydryl groups of polysulfide, producing cross-linking and rubber formation. The other catalysts listed belong to silicone systems or are not the polysulfide cross-linker.
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