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Thread Depth Effects on Stability and Positional Accuracy in Guided Immediate Implants: A Randomized Controlled

Na-Yoon Kwon1, Ji-Young Jung1, Kyung-A Ko1

  • 1Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry, Yonsei University, Seoul, South Korea.

Clinical Implant Dentistry and Related Research
|April 14, 2026
PubMed
Summary

Deeper implant threads increase insertion torque but may lead to greater angular deviation during guided immediate placement. Long-term stability and bone levels were unaffected, suggesting careful angulation control is key for deeper threads.

Keywords:
immediate implantimplant stabilitymacro‐designmarginal bone levelpositional accuracythread depth

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Area of Science:

  • Dentistry
  • Oral Implantology
  • Surgical Technology

Background:

  • Immediate implant placement using fully guided surgery is a common procedure.
  • Implant thread design is a critical factor influencing primary stability and surgical outcomes.
  • Understanding the impact of thread depth is essential for optimizing surgical predictability.

Purpose of the Study:

  • To investigate how varying implant thread depths affect implant stability and positional accuracy.
  • To compare the outcomes of reference tapered (BLT), standard-thread (MST), and deep-thread (MDT) implants in fully guided immediate placement.
  • To evaluate the 1-year follow-up results, including marginal bone levels.

Main Methods:

  • A prospective study involving 54 patients and 54 implants placed with fully guided surgery.
  • Comparison of three implant types: BLT, MST, and MDT.
  • Assessment of primary outcomes: insertion torque, implant stability quotient (ISQ), and implant stability value (ISV).
  • Evaluation of secondary outcomes: positional accuracy (angular deviation) and marginal bone level (MBL) at 12 months.

Main Results:

  • Insertion torque was significantly higher for deep-thread (MDT) implants compared to standard-thread (MST) and reference tapered (BLT) implants.
  • Angular deviation was greater for MDT implants, particularly in molar sites, compared to MST and BLT implants.
  • Implant stability (ISQ, ISV) and marginal bone levels at 12 months were comparable across all implant groups.

Conclusions:

  • Deeper implant threads enhance primary stability (insertion torque) in fully guided immediate placement.
  • Increased thread depth is associated with a higher risk of angular deviation, necessitating precise surgical angulation control.
  • Longitudinal implant stability and marginal bone preservation are not compromised by deeper thread designs, provided accurate placement is achieved.