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Implant Diameter, Length, and the Insertion Torque/Depth Integral: A Study Using Polyurethane Foam Blocks.

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|June 10, 2020
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Summary

The integral of the torque-depth curve (I) better detects primary stability changes from implant length or diameter variations than insertion torque (IT). This energy measure (I) offers improved sensitivity for assessing implant stability.

Keywords:
fixture diameterfixture lengthinsertion torqueprimary stabilitytorque-depth curve integralundersizing

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Area of Science:

  • Biomaterials Engineering
  • Dental Implantology
  • Biomechanics

Background:

  • Primary stability is crucial for dental implant success.
  • Insertion torque (IT) is a common, yet potentially limited, measure of primary stability.
  • The integral of the torque-depth curve (I) has emerged as a reliable indicator of primary stability.

Purpose of the Study:

  • To compare the efficacy of the integral of the torque-depth curve (I) versus insertion torque (IT) in detecting primary stability variations.
  • To evaluate how changes in implant diameter and length affect primary stability measurements.
  • To determine which metric, (I) or IT, is more sensitive to modifications in implant dimensions.

Main Methods:

  • Cylindrical dental implants with varying diameters and lengths were inserted into polyurethane foam blocks simulating human bone.
  • Measurements of insertion torque (IT) and the integral of the torque-depth curve (I) were recorded.
  • Correlation analyses were performed between stability metrics ((I), (I)*, IT, IT*) and implant dimensions (diameter, length), including size-corrected values ((I)*, IT*).

Main Results:

  • Both (I)* and IT* showed better correlation with implant diameter than (I) and IT.
  • (I), (I)*, IT, and IT* demonstrated equal correlation with implant length.
  • The integral of the torque-depth curve ((I) or (I)*) exhibited greater sensitivity (steeper slopes) in detecting changes related to implant diameter and length compared to insertion torque (IT or IT*).

Conclusions:

  • The integral of the torque-depth curve ((I) or (I)*) is a more effective measure than insertion torque (IT or IT*) for detecting variations in primary dental implant stability.
  • (I) or (I)* provide superior sensitivity to changes in implant diameter and length, enhancing assessment of primary stability.
  • This finding supports the use of (I) as a more refined metric for evaluating primary implant stability in diverse clinical scenarios.