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Related Experiment Video

Updated: Jun 16, 2026

Real-Time Dynamic Navigation System for the Precise Quad-Zygomatic Implant Placement in a Patient with a Severely Atrophic Maxilla
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Real-Time Dynamic Navigation System for the Precise Quad-Zygomatic Implant Placement in a Patient with a Severely Atrophic Maxilla

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Postorthodontic root approximation after opening space for maxillary lateral incisor implants.

Taylor M Olsen1, Vincent G Kokich

  • 1Department of Orthodontics, University of Washington, Seattle, WA, USA. TaylorOlsenDDS@gmail.com

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|February 16, 2010
PubMed
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American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics·2013

Root approximation after orthodontic space opening for missing lateral incisors can prevent implant placement in 11% of patients. Maintaining adequate space with retention aids is recommended for successful dental implant outcomes.

Area of Science:

  • Dentistry
  • Orthodontics
  • Implantology

Background:

  • Congenitally missing maxillary lateral incisors often require orthodontic space opening in adolescence.
  • A significant time gap between orthodontic treatment and implant placement can lead to root approximation.
  • This root movement can compromise space for subsequent dental implant placement.

Purpose of the Study:

  • To investigate the phenomenon of central incisor and canine root approximation after orthodontic space opening.
  • To determine the incidence of root approximation preventing implant placement.
  • To establish criteria for adequate space maintenance during retention.

Main Methods:

  • Retrospective analysis of 94 patient records with missing maxillary lateral incisors.

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  • Radiographic measurements (periapical and panoramic) of intercoronal and interradicular distances.
  • Evaluation of space changes before and after orthodontic treatment and at implant placement.

    • Main Results:

    • Root approximation between adjacent incisor and canine roots occurred in some patients during retention.
    • 11% of patients experienced root approximation severe enough to preclude implant placement.
    • Variability in root approximation suggests inconsistent relapse patterns.

    Conclusions:

    • Recommend maintaining at least 6.3 mm intercoronal and 5.7 mm interradicular space for implant placement.
    • Utilizing retention aids like bonded wires or resin-bonded bridges can mitigate root approximation.
    • Proactive space management is crucial for successful implant rehabilitation in cases of missing lateral incisors.