Purpose: to determine the relationship between bone loss that occurs during the peri-implantitis
process and variations in implant stability using resonance frequency analysis measurement
methods. Material & methods: 40 self- tapping implants were placed in cow ribs. For each
group of 10 implants, a bone loss of 0 mm, 4 mm (simulating 1/3 of bone loss) and 8 mm
(simulating 2/3 of bone loss) was established. Osteotomy measurements were made with a
periodontal probe. For each implant, RFA was measured using the OSSTELL BEACON system
by the same operator. Results: The initial ISQ value of the 40 implants placed exceeded values of
70, reflecting an average of 73 in the VL direction and 74.8 in the MD direction. ISQ
measurements in the 10 implants in which bone dehiscence was performed on the vestibular
aspect reflected a decrease in ISQ values as bone loss deepens. When generating bone loss in two
opposite faces (V and L), a greater decrease in ISQ values was observed when 2/3 of the implant
were affected. The average value of the measurements in the VL direction was less than 70
when the loss is 2/3. Conclusions: when bone loss occurs on only one side of the implant, the ISQ values
decrease,but the implant maintains good stability. The same occurs when two opposite sides of the implant
are affected, the unaffected side has the least decrease in ISQ value.
Keywords: peri-implantitis; peri-implant defect; ISQ