Based on my experience, people like to hear stories, if you make it interesting! You can use your design critique sessions as a starting point to use your personas, so in each design critique session you should start it with a story about a specific persona that is going to use that specific part of your web/app, speak a little bit about the persona at first, then encourage participants to check the wall or shared dropbox file later to know more about that persona (or in your design critique invitation email you can remind attendees to go over the personas before joining the critique session).
I believe that should be a great way to start. Then contentiously refer to those personas, and encourage your team to mention their ideas based on its related persona and not what they like. It's hard, but over the time people will understand the value of that by seeing a great level of customer/user satisfaction.