Relation between insertion torque and bone-implant contact percentage: An artificial bone study

Cheng Liu, Ming Tzu Tsai, Heng Li Huang, Michael Yuan Chien Chen, Jui Ting Hsu, Kuo Chih Su, Chih Han Chang, Aaron Yu Jen Wu

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Objectives: The purpose of this study was to determine the correlation between the peak insertion torque value (ITV) of a dental implant and the bone-implant contact percentage (BIC%). Material and methods: Dental implants were inserted into specimens comprising a 2-mm-thick artificial cortical shell representing cortical bone and artificial foam bone representing cancellous bone with four densities (groups 1 to 4-0. 32, 0. 20, 0. 16, and 0. 12 g/cm3). Each specimen with an inserted implant was subjected to micro-computed tomography (micro-CT) scanning, from which the 3D BIC% values were calculated. Pearson's correlation coefficients (r) between the ITV and BIC% were calculated. Results: The ITVs in groups 1 to 4 were 56. 2 ± 4. 6 (mean±standard deviation), 45. 6 ± 0. 9, 43. 3 ± 4. 3, and 38. 5 ± 3. 4 N cm, respectively, and the corresponding BIC% values were 41. 5 ± 0. 5%, 39. 0 ± 1. 0%, 30. 8 ± 1. 1%, and 26. 2 ± 1. 6%. Pearson's correlation coefficient between the ITV and BIC% was r = 0. 797 (P < 0. 0001). Conclusion: The initial implant stability, quantified as the ITV, was strongly positively correlated with the 3D BIC% obtained from micro-CT images. Clinical relevance: The ITV of a dental implant can be used to predict the initial BIC%; this information may provide the clinician with important information on the optimal loading time.

Original languageEnglish
Pages (from-to)1679-1684
Number of pages6
JournalClinical Oral Investigations
Issue number6
Publication statusPublished - 2012 Dec

All Science Journal Classification (ASJC) codes

  • Dentistry(all)


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