What you need to do is get your form right on the bench. If that means you are having issues with scapula retraction or other shoulder problems because of how the stabilizers fire improperly then you might need physical therapy to get it right. I ended up with a shoulder impingement from doing primarily all dumbell crap. Once I got the shoulder fixed through therapy, and kept up with support exercises I started using barbells again, never should have not used them. You can build a massive chest with barbells. I don't even have dumbells, haven't used one in years, you can see my chest if you like, decently large.
