It is important to have a place in the classroom where students can go to regain control over themselves. First you must teach students that they have the ability to control themselves. I like to borrow from Stephen Covey by saying that between the stimulus and the response is a gap and in that gap is your ability to choose your response.
Once students understand the only person's whose behavior they can control is their own, then they can go about the process of doing do. Provide them with a place--an oversized comfortable chair--where they can elect to sit when they are feeling particularly challenged. This will greatly reduce incidents of classroom misbehavior and will keep the student in the classroom instead of constantly being sent to the office for correction or discipline.
If we keep sending children to the dean, principal or assistant principal for discipline, we are sending the message that they can't control themselves. Is this really the message you want them to learn?