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Structure of implant 2. (a) Low magnification showing the gross features of the implant; (b) discoloration is evident at a higher magnification. The violet and yellow discoloration indicates oxidation of Ti; (c) implant rough interface demonstrating severe cracking, which probably led to bulk exposure; and (d) higher magnification with removal of the top layers of the metal (arrows) in the top region of the implant.
