root canal fillings

I am currently undergoing root canal therapy on 2 Teeth .One previous one already done earlier has silver amalgam filling .What is recommendation for the filling .
Should i  go for same type of filling or go for something else .

I also have chronic IBS

[StratRebel]

Removing the pulp tissue of a tooth dries it out and weakens it.  All posterior teeth that have been root canaled need a crown to prevent the tooth from splitting.  Anterior teeth should get a crown or composite filling to strengthen the tooth.  Silver fillings are not an option for a tooth that has a root canal.

[jaimasand]

What is filling normally used  .They normally do filling and then they put a cap .
What should the composite filling be (what material).I read and understood there seems a big debate between potential hazards of using Silver amalgam fillings .

[StratRebel]

The so called potential hazards you read about is a controversy that has been going on for decades, with almost no proof at all.  I would not worry about silver fillings from that perspective.

Normal depends on the office, some use more amalgam, some more composites.  When I say composite, thats what the filling is called.  There are only two main types of fillings, white composites and silver amalgams.  

You are correct, most crowns require a buildup, which is basically a filling under the crown.  What material does not matter much.  Amalgams are a little stronger, and under a crown would not pose any problem even according to the group that claims they are hazardous.  But newer composites are almost as good.