Lower the dumbbells in a controlled fashion to the shoulders (your hands should be just outside your shoulders at the bottom of the lift), inhaling as you lower the weight. (build-muscle-and-burn-fat.com)
Lower the weight in an arc, using a controlled motion, to the shoulders or slightly below (your hands should be just outside your shoulders at the bottom of the lift). (build-muscle-and-burn-fat.com)
How about stronger, more stable joints, better control in the bottom of your lifts, reduced incidence of injury, and bigger overall gains. (onnit.com)