Best DVD quality export?

I have made about a 6 minute video on FCPX, and I need to export it to a dvd. I exported the Final Cut Pro file to Pro Res 422, and the quality looks great when played on my computer. To make a dvd, I just used share to DVD on Final Cut, and when I went to watch it, it did not look nearly as good and crisp as the Pro Res file. Any idea on how I can export a dvd with the absolute best quality possible? Also, my mac is new, so it did not come with iDVD. Any assitance would be very helpful! Thanks