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Relation between insertion torque and bone–implant contact percentage: an artificial bone study

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Abstract

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.

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Acknowledgments

This research was supported by China Medical University, Taiwan (grant number CMU 99-COL-43).

Conflict of interest

None of the authors of this study has any financial and personal relationships with other people or organizations that could have inappropriately influenced this study.

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Authors and Affiliations

  1. Institute of Biomedical Engineering, National Cheng Kung University, Tainan, 701, Taiwan

    Cheng Liu, Kuo-Chih Su & Chih-Han Chang

  2. Department of Biomedical Engineering, HungKuang University, Shalu, 433, Taiwan

    Ming-Tzu Tsai

  3. School of Dentistry, College of Medicine, China Medical University, 91 Hsueh-Shih Road, Taichung, 404, Taiwan

    Heng-Li Huang, Michael Yuan-Chien Chen & Jui-Ting Hsu

  4. Division of Oral & Maxillofacial Surgery, China Medical University Hospital, 2 Yuh-Der Road, Taichung, 404, Taiwan

    Michael Yuan-Chien Chen

  5. Department of Dentistry, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, 833, Taiwan

    Aaron Yu-Jen Wu

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  1. Cheng Liu
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Corresponding author

Correspondence to Jui-Ting Hsu.

Additional information

Cheng Liu and Michael Yuan-Chien Chen contributed equally to this work

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Liu, C., Tsai, MT., Huang, HL. et al. Relation between insertion torque and bone–implant contact percentage: an artificial bone study. Clin Oral Invest 16, 1679–1684 (2012). https://doi.org/10.1007/s00784-011-0658-0

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  • DOI: https://doi.org/10.1007/s00784-011-0658-0

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