Turner scored 12 of his 21 points in the final period and had four during a 10-0 run early in the quarter that broke open the game. Atlanta suffered its second consecutive loss and dropped to 7-4 on the road.
The 76ers have defeated Atlanta in each of their last six meetings. Philadelphia's Jrue Holiday, who had missed four games with a sprained left foot, scored 11 points in his return.
Josh Smith led Atlanta with 17 points. Philadelphia had only a four-point lead with 9:30 to play when it went on its key run.
2014: NFL Cheerleaders [PHOTOS]
Michael Sam cut from the Dallas Cowboys