When one intends to insert a new screw in the lodging of one of the extracted screws, rescue screws should be used. They have a larger spire, and facilitate the anchorage in the cervical screw's lodging. Rescue screw with a thicker thread core. Blunt point to assure that the posterior cortical is not perforated. Torque-limiting blocking system. Non profile-increasing blocking system (without covers) . Green colour code.
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