Novocaine? Not necessarily. The widespread belief that dentists rely on Novocaine to make those office visits almost painless needs some updating, according to an article scheduled for the June 29 issue of Chemical & Engineering News, ACS" weekly newsmagazine. In fact, patients are more likely to get any of several other anesthetics than the century-old standby Novocaine, which once reigned as the archetypal dental anesthetic.