Last week was busy for Accelmed, a U.S.- and Israel-based investment firm, as it acquired Burlington, Mass.-based Keystone Dental Inc. Specific terms of the agreement were not disclosed. In discussing the transaction with BioWorld MedTech, Uri Geiger, managing partner of Accelmed, could not elaborate on the size of the Keystone deal. However, he did provide some detail about why it represented an attractive target. "I can tell you . . . that Keystone sells in excess of $40 million," he said, adding that it "is the largest transaction in the history of Accelmed."