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Structure of implant 5. (a) Low magnification showing the gross features of the implant with bone attachment throughout the surface of the implant and cement surrounding the crown edges; (b) discoloration is also evident in this example; the smooth surface was covered by cement; (c) implant rough interface with evidence of crack development. The arrows highlight a large pit with crack nucleation inside; and (d) higher magnification of an exposed area of the abutment with scratching.
