We did an internal sinus lift and placed an Osstem implant 4×8.5mm in site 25. The pre-op residual bone height was 3mm. I did a bone graft with Botiss Cerabone which appears on the post-op CBCT to be dislodged and penetrates into the sinus. I assumed this was caused by a perforation in the Schneiderian membrane. I prescribed amoxicilin 875mg + clavulonic acid 125mg. Any recommendations on how to proceed?