Correlation between Initial BIC and the Insertion Torque/Depth Integral Recorded with an Instantaneous Torque-Measuring Implant Motor: An in vivo Study

Paolo Capparé, Raffaele Vinci, Danilo Alessio Di Stefano, Tonino Traini, Giuseppe Pantaleo, Enrico Felice Gherlone, Giorgio Gastaldi

Research output: Contribution to journalArticlepeer-review


Background: Quantitative intraoperative evaluation of bone quality at implant placement site and postinsertion implant primary stability assessment are two key parameters to perform implant-supported rehabilitation properly. A novel micromotor has been recently introduced allowing to measure bone density at implant placement site and to record implant insertion-related parameters, such as the instantaneous, average and peak insertion torque values, and the insertion torque/depth integral. Purpose: The aim of this study was to investigate in vivo if any correlation existed between initial bone-to-implant contact (BIC) and bone density and integral values recorded with the instrument. Materials and Methods: Twenty-five patients seeking for implant-supported rehabilitation of edentulous areas were consecutively treated. Before implant placement, bone density at the insertion site was measured. For each patient, an undersized 3.3×8-mm implant was placed, recording the insertion torque/depth integral values. After 15 minutes, the undersized implant was retrieved with a 0.5mm-thick layer of bone surrounding it. Standard implants were consequently placed. Retrieved implants were analyzed for initial BIC quantification after fixation, dehydration, acrylic resin embedment, sections cutting and grinding, and toluidine-blue and acid fuchsine staining. Correlation between initial BIC values, bone density at the insertion site, and the torque/depth integral values was investigated by linear regression analysis. Results: A significant linear correlation was found to exist between initial BIC and (a) bone density at the insertion site (R=0.96, explained variance R2=0.92) and (b) torque/depth integral at placement (R=0.81, explained variance R2=0.66). Conclusions: The system provided quantitative, reliable data correlating significantly with immediate postinsertion initial BIC, and could therefore represent a valuable tool both for clinical research and for the oral implantologist in his/her daily clinical practice.

Original languageEnglish
Pages (from-to)e613-e620
JournalClinical Implant Dentistry and Related Research
Publication statusPublished - Oct 1 2015


  • Bone density
  • Bone to implant contact
  • Dental implant
  • Histomorphometry
  • Implant stability
  • Insertion torque
  • Primary stability

ASJC Scopus subject areas

  • Dentistry(all)
  • Oral Surgery


Dive into the research topics of 'Correlation between Initial BIC and the Insertion Torque/Depth Integral Recorded with an Instantaneous Torque-Measuring Implant Motor: An in vivo Study'. Together they form a unique fingerprint.

Cite this