At the annual meeting of the #2 U.S. amalgam manufacturer, a broad-based coalition of community, faith-based, and environmental groups called on Dentsply International to cease making amalgam.    The speakers unveiled a letter from 23 organizations from Pennsylvania, around the nation, and from six continents — including several religious orders — calling for Dentsply to set a timetable to phase-out mercury amalgam, according to news reports. Shareholders also similarly weighed in.