RESUMO
Background: Primary stability is an important key determinant of implant osseointegration. We investigated ap-proaches to improve primary implant stability using a new drilling technique termed osseodensification (OD),which was compared with the conventional under-drilling (UD) method utilized for low-density bones.Material and Methods: We placed 55 conical internal connection implants in each group, in 30 low-density sec-tions of pig tibia. The implants were placed using twist drill bits in both groups; groups Under Drilling (UD)and Osseodensification (OD) included bone sections subjected to conventional UD and OD drilling, respectively.Before placing the implants, we randomized the bone sections that were to receive these implants to avoid samplebias. We evaluated various primary stability parameters, such as implant insertion torque and resonance fre-quency analysis (RFA) measurements.Results: The results showed that compared with implants placed using the UD technique, those placed using theOD technique were associated with significantly higher primary stability. The mean insertion torque of the im-plants was 8.87±6.17 Ncm in group 1 (UD) and 21.72±17.14 Ncm in group 2 (OD). The mean RFA was 65.16±7.45ISQ in group 1 (UD) and 69.75±6.79 ISQ in group 2 (OD).Conclusions: The implant insertion torque and RFA values were significantly higher in OD group than in UD.Therefore, compared with UD, OD improves primary stability in low-density bones (based on torque and RFAmeasurements).(AU)
