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Updated: May 8, 2026

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model
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Ridge width gain with screw spreaders: a cadaver study.

Hsun-Liang Chan1, Jia-Hui Fu, Tapan Koticha

  • 1*Clinical Adjunct Assistant Professor, Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI. †Assistant Professor, Department of Preventive Dentistry (Periodontology) at the Faculty of Dentistry, National University of Singapore, Singapore. ‡Resident, Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI. §Clinical Assistant Professor, Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI. ‖Professor and Director, Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI.

Implant Dentistry
|September 10, 2013
PubMed
Summary

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This summary is machine-generated.

Screw spreaders offer modest ridge expansion for horizontal augmentation. However, they may require additional bone grafting for ridges narrower than 4.5 mm to prevent dehiscence.

Area of Science:

  • Dental implantology
  • Oral surgery
  • Bone augmentation techniques

Background:

  • Evaluating the efficacy of screw spreaders for alveolar ridge expansion in edentulous maxillae.
  • Assessing the impact of screw spreader use on ridge width and buccal plate integrity.

Purpose of the Study:

  • To quantify ridge expansion achieved with screw spreaders.
  • To determine the incidence of buccal dehiscence and measure buccal plate thickness post-expansion and implant placement.

Main Methods:

  • Cadaver study involving 11 edentulous maxillae (20 sites).
  • Expansion of ridges (3-6 mm initial width) using screw spreaders.
  • Measurement of ridge width, buccal plate thickness, and dehiscence incidence.

Main Results:

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  • Mean ridge width increased from 3.97 mm to 4.76 mm (0.79 mm expansion).
  • Buccal dehiscence occurred in 7/9 sites with initial width <4 mm.
  • Buccal plate thickness ≥1 mm was observed in sites with initial width ≥4.5 mm post-implantation.

Conclusions:

  • Screw spreaders provide limited horizontal ridge augmentation.
  • Additional bone augmentation may be necessary for ridges <4.5 mm to avoid dehiscence.
  • Use of this instrument kit for horizontal augmentation is indicated only in specific clinical scenarios.