Andy Dunne joined Neil Treacy on the line from the Aviva Stadium after Ireland's bonus-point 26-14 Six Nations win over France in Joe Schmidt's last home game in charge.
Captain Rory Best, Johnny Sexton, Jack Conan and Keith Earls all went over for tries - an Irish victory against Grand Slam-chasing Wales in Cardiff on Saturday could yet sweep the title, though that would also require an England slip-up against Scotland at Twickenham.
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