Making a radiograph when the impression coping/implant or impression coping/abutment is below the level of the mucosa to insure seating of the impression copings. A custom tray with access to the impression coping screws is required.
They require access to the retaining screw to allow release of the screw prior to removal of the impression coping - impression assembly, the analogues are attached to the impression copings while they are embedded in the impression tray. No custom tray is required for this type of impression.Ĭharacteristics of the pick up type impression coping are that they are removed from the mouth together with the set impression. The other type is incorporated in the impression and is removed from the mouth together with the set impression and is known as a pick up type impression coping.Ĭharacteristics or the transfer type impression coping are that they remain in the mouth on removal of the set impression, the analogue is attached to the impression coping after removal from the mouth and this assembly is replaced in the indentation left on the set impression. The impression coping takes two general forms, one type is retained in the mouth when the set impression is removed – this type of impression coping is known as the transfer type impression coping.
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