An Equinox implant (part of the Straumann Group) 3.3×11.5 was placed in 11 site. At second stage after 4 months, the abutment screw would not engage and could not be tightened. The same abutment can be fitted into the adjacent implant. We have tried with 3 different screws: one with the kit, one with the adjacent implant and third another one from Equinox only. Have taken IOPA. The abutment is not an issue. Have checked the seating of the abutment without the screw. There are no bony or soft tissue interferences seen. What may be the reason for the screw not engaging the fixture and what options do I have?
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