Management and Restoration of an Implant With Irreversibly Damaged Internal Threads: A Clinical Report
This report describes a method to restore an implant with irreversibly damaged internal threads. The remaining fractured post from the previous restoration was removed using a combination of an impression coping and an end-cutting bur. An elastomeric impression of the internal surface of the damaged implant, as well as the position of the adjacent implant, was made for fabrication of a new cast post and core and an implant supported 2-unit ceramometal splinted prosthesis.
Figure 1. Periapical radiograph showing measurement of fractured post inside implant. Figure 2. Calibration of end-cutting bur to depth shown in Figure 1. Figure 3. Impression coping in place. Figure 4. Clinical view of fractured post removal. Black mark on bur shank shows penetration limit. Figure 5. Radiographic view of fractured piece removal. Figure 6. Clinical view after post removal showing 2 adjacent implants.
Figure 7. Clinical view showing low-viscosity polyvinyl siloxane material inside impression coping. Figure 8. Completed impression. Figure 9. Periapical radiograph of completed prosthesis. Figure 10. Clinical view of completed prosthesis on right.
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