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The 'pistol spring' for correcting ectopic permanent molar.

Li Mei1

  • 1Discipline of Orthodontics, Department of Oral Sciences, Faculty of Dentistry, University of Otago, Dunedin, New Zealand.

Journal of Orthodontics
|November 1, 2025
PubMed
Summary
This summary is machine-generated.

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Ectopic eruption of the first permanent molar affects up to 6% of children. A new

Area of Science:

  • Pediatric Dentistry
  • Orthodontics
  • Biomaterials Engineering

Background:

  • Ectopic eruption of the first permanent molar is a common pediatric dental issue, affecting up to 6% of children.
  • Current treatment options for ectopic molars include observation or active correction using orthodontic appliances.
  • Existing methods often require frequent adjustments and can be time-consuming for both patients and clinicians.

Purpose of the Study:

  • To present a novel, step-by-step fabrication and application protocol for the 'pistol spring' system.
  • To evaluate the 'pistol spring' as an efficient orthodontic appliance for managing ectopic first permanent molars.
  • To assess the system's ease of use, patient tolerance, and impact on treatment efficiency.

Main Methods:

  • Detailed description of the 'pistol spring' system's construction.
Keywords:
coil springdistalisationectopic molaruprighting molar

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  • Application technique for delivering consistent, sustained force to correct molar ectopia.
  • Clinical evaluation focusing on fabrication simplicity, patient comfort, and chair-side time reduction.

    • Main Results:

    • The 'pistol spring' system provides consistent, sustained force, minimizing the need for frequent reactivation.
    • The appliance is easy to fabricate and demonstrates good patient tolerance.
    • Significant improvements in treatment efficiency, patient compliance, and reduced chair-side time were observed.

    Conclusions:

    • The 'pistol spring' is a cost-effective and time-efficient solution for managing ectopic first permanent molars in children.
    • This innovative system is particularly beneficial for pediatric patients with limited appointment availability.
    • The 'pistol spring' enhances treatment outcomes and patient experience in managing molar ectopia.