Everything is going digital these days, and orthodontics is no exception. Align Technology (ALGN), the inventor of invisible teeth aligners, is bringing orthodontists' offices into the 21st century. The San Jose, Calif.-based firm acquired Cadent Holdings last year, and with it, 3D digital scanning technologies that dentists can use "chair-side" to get a digital impression or mold of a patient's teeth to use in various procedures. "About 70% of