PMID- 32879929 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Int J Oral Implantol (Berl) JT - International Journal of Oral Implantology IS - 2631-6439 (Electronic) IS - 2631-6420 (Print) IP - 3 VI - 13 PST - ppublish DP - 2020 PG - 241-252 LA - en TI - Bone modifications around porous trabecular implants inserted with or without primary stability 2 months after tooth extraction: A 3-year controlled trial FAU - Bianconi, Stefano AU - Bianconi S FAU - Wang, Hom-Lay AU - Wang H FAU - Testori, Tiziano AU - Testori T FAU - Fontanella, Fabrizio AU - Fontanella F FAU - Del Fabbro, Massimo AU - Del Fabbro M CN - OT - alveolar bone resorption OT - bone regeneration OT - dental implants OT - implant primary stability OT - osseoincorporation OT - osseointegration OT - osseous defects AB - Purpose: Implant primary stability has long been considered a prerequisite for successful osseointegration. However, achieving stability may be difficult when placing implants in wide postextractive bone defects. The purpose of this study was to conduct a clinical and radiographic investigation of bone modifications at porous-structured implants inserted with or without primary stability. Materials and methods: Fifty porous-structured implants were inserted in the posterior sockets of 50 consecutive patients 2 months after tooth extraction, combined with allogeneic bone and a resorbable membrane. The implants were divided into two groups according to insertion torque: spinner (spinning at 35 Ncm, n = 23) and stable (stable at 35 Ncm, n = 27). Implant stability was assessed by resonance frequency analysis from baseline to 6-month function. Follow-up took place 3 years after implant placement. Results: At baseline, the implant stability quotient was undetectable in the spinner group and averaged 75.07 ± 5.84 in the stable group. At uncovering, the implant stability quotient increased to 71.33 ± 4.42 and 77.97 ± 3.30 in the spinner and stable group, respectively (P < 0.001). After 6 months of loading, no between-group difference in implant stability quotient was found (P = 0.13). Marginal bone level changes were similar between groups at all follow-ups, averaging −0.41 ± 0.77 mm and −0.15 ± 0.53 mm at 36-month follow-up in the spinner and stable group, respectively (P = 0.35). No implant failed throughout the observation period. Neither biological nor mechanical complications occurred. Conclusion: Implants with a moderately rough surface and a porous-structured body may osseointegrate even without primary stability. AID - 856064