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Related Experiment Videos

Mandibular arch changes following nonextraction treatment.

David T Waring1, Neil Pender, Dan Counihan

  • 1Orthodontic Department, University Dental Hospital of Liverpool, United Kingdom. dtwaring@hotmail.com

Australian Orthodontic Journal
|January 25, 2006
PubMed
Summary
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Lip bumper and fixed appliance orthodontic treatment expanded the mandibular arch and uprighted lower molars without affecting lower incisor position. This nonextraction approach effectively managed crowding by utilizing leeway space.

Area of Science:

  • Orthodontics
  • Dentofacial Orthopedics

Background:

  • Mandibular incisor crowding is a common orthodontic concern.
  • Nonextraction treatments are preferred when possible to manage arch space.
  • Lip bumpers and fixed appliances are used to address arch discrepancies.

Purpose of the Study:

  • To evaluate changes in mandibular tooth position after lip bumper and fixed appliance treatment.
  • To determine how space was created for aligning crowded lower incisors.

Main Methods:

  • A cohort of 34 children (mean age 10.6 years) received lip bumper followed by fixed appliance therapy.
  • Lateral cephalometric radiographs and study models were analyzed pre- and post-treatment.
  • Measurements included mandibular arch depth, intermolar width, molar position/angulation, and incisor position/angulation.

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Main Results:

  • Mandibular arch depth decreased (1.2 mm), and intermolar width increased (1.73 mm) significantly (p < 0.01).
  • Mandibular molars moved mesially (2.14 mm) and tipped distally (4.36 degrees) (p < 0.01).
  • No significant changes were observed in mandibular incisor position or angulation compared to pretreatment or growth data.

Conclusions:

  • Lip bumper and fixed appliance treatment expands the mandibular arch and uprights lower molars.
  • This nonextraction method maintains leeway space and is effective for managing mandibular crowding.
  • The treatment protocol did not alter the position of the lower incisors.