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Trephine drills are used for bone harvesting, bone perforation, implant removal.Thin cutting blade for minimum bone loss.Dental trephine burs allow the preparation of bone cylinders with diameter of 3.0mm to 10.0mm for transplantation.The smaller diameter instruments are more suited for the preparation of a bone lid during an apicoectomy.Trephine burs remove the bone in a circular form during surgical procedures for bone grafting