a.Composite
b.Zinc-free amalgam
c.Gutta-percha
d. Methyl methacrylate
Ans.b.Zinc-free amalgam
Explanation:A retrofilling (also called a reverse filling or retrograde amalgam filling) is placed to seal the apical
portion of the root canal. This procedure is used when an apicoectom y alone will not yield a good
result. Whenever there is any chance whatsoever that an apical seal may be faulty, a reverse filling
material must be placed.
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