Acoustic Ceiling Tiles - HOW DO I GET A CLEAN, PROFESSIONAL CUT (OTHER THAN UTILITY KNIFE)????

With everything on the web these days, I can't seem to get any good answers (via Google search) on how to get a really clean looking cut when cutting acoustic ceiling tiles. Had an ice maker leak and need to replace some tiles in a finished basement. I've replaced one tile prior to this and used a utility knife. It looks good (and although not noticeable) it just isn't as clean and sharp looking as the others. Any acoustic ceiling tile cutting tools that can achieve this look?