Mac users are fiercely loyal. Unfortunately there have been few viable Mac options for dentistry. The current leader is MacPractice. Follow the link for details. They have a relatively small dental user base but also provide software in the medical industry so they have better stability than if they were dental only. If you are a die hard Mac user (and they all are) check it out.
MacPractice DDS is a best-of-class Mac dental software application, creating a new choice of practice management and clinical software for all dentists, and a Mac OS X migration path for DentalMac users.