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.