Download or read book Correlation of Insertion and Removal Torque in Polyurethane Foam Devices Simulating Bone Qualities D1 and D2 written by Vogl Susanne and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Background:Successful osseointegration of dental implants is determined by several factors including implant surface characteristics, bone morphology and metabolism as well as primary stability of dental implants. Lack of primary implant stability and other co-factors may result in loss of osseointegration, leading to implant failures. Precise presurgical site analysis, stringent case selection, comprehensive planning and accurate surgical approach are prerequisites for functional and esthetic success. Aim:The aim of the present in vitro study was to compare insertion and removal torque of implants in polyurethane foam devices simulating bone qualities 1 and 2. Material and Methods;Sixty-four dental implants (NobelReplace Conical Connection, Nobel Biocare Gu00f6teborg, Sweden) were inserted (calibrated Elcomed, W&H, Austria) by 2 different surgeons (ML & SV) in solid rigid polyurethane foam devices with density of pcf (pounds per cubic foot) 30 or 40, which were laminated with pcf 50, for simulating bone qualities D1 and D2, respectively, according to Misch Parameters evaluated were insertion and removal torque, differences between 2 diameters (3.5 mm/13 NP and 4.3 mm/13 RP) and differences between the bone qualities. Pearson correlation coefficient was evaluated for determining the correlation between insertion and removal torque in all groupsResults: Insertion torque reached a maximum of 800 Nmm in foam simulating bone quality D1 with diameter 3.5 and 4.3 mm implants (min: 140/638; mean 512.1/763.1; SD:192/50.1), and a maximum of 568 Nmm for bone quality D2 with 3.5 mm diameter implants (min: 221; mean: 466.8; SD: 78.6). RP Implants reached a maximum insertion torque of 800 Nmm in bone quality D2 (min:339; mean: 471.8, SD: 144.7).Removal torque amounted to a maximum of 800 Nmm in bone quality D1 (min:89; mean: 365.8; SD: 194.6) for 3.5 mm diameter implants and a maximum of 694 Nmm for 4.3 mm implants (min: 409; mean: 551.1; SD: 70.3). In quality D2 bone , the 3.5 mm implants reached 379 Nmm as a maximum (min:169; mean: 317.1; SD: 49.4), whereas 4.3 mm implants had a maximum removal torque of 637 Nmm (min: 238; mean:362.5; SD:96.2).The correlation of insertion and removal torque were significant (r = 0,747 to r=0,895 for the different groups).Conclusion and clinical implication:Evaluation of insertion torque is appropriate method to assess primary stability of dental implants. Further clinical studies are needed to verify a correlation between preoperative assessment of bone quality and insertion torque to implement appropriate loading protocols.