| http://www.w3.org/ns/prov#value | - There are host of variables in why this could happen not limited to, non-integration of the graft material, infection, peri-implantitis for no reason, oversized implant, not enough bone on the outer wall , abutments screw not completely seated or tightened, non-integration of implant parts, and about 30 more reasons including your health and habits such as smoking.
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