Strikes from Ryan Williams and Tony Diagne extended struggling Bury's winless streak to seven matches as the Shrimps moved up to fourth in the League Two table.
Bentley said: "We knew this was going to be a tough game. Bury can mix it - they can go long, they can play football and they've got players who can hurt you.
"They put us under a lot of pressure so we had to weather the storm and, when called upon, Barry Roche was excellent.
"But we dug in, addressed a couple of things at half-time and in the second half we were very professional, nice and solid.
"It's a fine dividing line but if you can get someone who can score from 30 or 35 yards, direct from a free-kick, you're always in with a chance.
"We got our noses in front and you could see the momentum was building, then big Tony (Diagne) has gone through and smashed one into the bottom corner.
"Two-nil might flatter us but you take it because it's three points again and a clean sheet."