Objectives: The aim of this prospective study was to evaluate the influence of insertion torque(IT), resonance frequency analysis(RFA) expressed as ISQ, and loading type, on implant survival. Methods: Patients requiring implant therapy were treated by tooth extractions, placement of 1-9 MIS® implants, bone augmentation as needed and fixed provisional restorations. We measured IT, ISQ and radiographic bone-crest to implant-shoulder distance for non-submerged loaded(NSL), non-submerged non loaded(NSNL) and submerged(S) implants at baseline and 6 months. Results: 19 patients (17F, 2M), Aged 34-79 yrs are included in this report. 74 implants were inserted (44 maxillary and 30 mandibular). 41 implants, 26 in fresh extraction sites, were immediately loaded. 12 implants (16%), ten maxillary, failed at/before 6 months, in 4 patients. Ten failed implants were NSL, 9 in fresh extraction sockets. 6(50%) failed implants were 4.2mm in diameter. 6 month survival rate was 78% in the Maxilla and 94% in the mandible. Mean IT was 40.23Ncm±1.44S.E., 36.32±1.66, 40.0±3.23 for the NSL, S and NSNL groups. ISQ at insertion(ISQimm) was 66.03±2.36S.E., 58.2±2.47, 67.22±1.89 for the NSL, S and NSNL groups, significantly different between groups NSL-S (p=0.0460). ISQ6months was 62.94±0.97, 56.05±2.18 and 61.46±4.96 respectively, similarly different between groups (p=0.0461). No significant differences were found for IT, ISQ and bone changes between extraction vs. non extraction groups. No differences for IT, ISQ and bone levels were found for failing vs. successful implants. We found a significant difference between maxillary and mandibular sites in IT (36.27±1.28S.E. vs. 42.31±1.55, p=0.0282). No significant differences were found in bone measurements or ISQ. Conclusion: Correlations were found between Implant diameter and both ISQ levels and survival rates; Higher insertion torques in mandible; Decrease in ISQ between 0-6 months; Higher failure rate in maxilla and extraction sites; No correlation between survival rates and implant length, insertion torque and ISQ levels.

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