The Study on the Accuracy of Peri-implant Probing and Related Influencing Factors

"Before removal of the prosthetic reconstruction:~* Measurement of PPD-1: The PPDs at 6 site were measured as the distance from the mucosal margin to the base of the peri-implant pocket.~* Measurement of BOP-1：Bleeding sites after gentle probing within 15s were recorded as BOP scores. A positive score (1 point) was recorded if bleeding was observed during either of probing assessment by two researchers.~After removal of the prosthetic reconstruction, PPD-2 and BOP-2 were recorded following the same protocol."