Isodam Polyisoprene Dental Dam is used to isolate specific areas of the mouth during procedures provide comfort to the patient. Polyisoprene (latex free) ISODAM material. Available in 150mm (6x6) size. Medium or heavy thickness. Isodam provides exceptional stretch, strength and tear resistance. Available in 5" x 5" Heavy and Medium and 6" x 6" Heavy and Medium.