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Second molar impaction associated with lip bumper therapy.

Helder Baldi Jacob1, Shawn LeMert1, Richard G Alexander2

  • 1Texas A&M University Baylor College of Dentistry.

Dental Press Journal of Orthodontics
|January 29, 2015
PubMed
Summary
This summary is machine-generated.

Lip bumpers (LBs) can increase mandibular arch length but may cause second molar impaction. However, most impacted molars were successfully treated with interventions like surgery or spacers.

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Area of Science:

  • Orthodontics
  • Pediatric Dentistry

Background:

  • Lip bumpers (LBs) are effective for increasing mandibular arch perimeter in mixed-dentition.
  • Orthodontists hesitate to use LBs due to concerns about permanent second molar eruption disturbances.

Purpose of the Study:

  • To evaluate the incidence of second molar impaction linked to lip bumper therapy.
  • To explore methods for resolving these impactions.

Main Methods:

  • Radiographic analysis (panoramic and lateral cephalometric) of 67 patients before and after LB treatment.
  • Assessment of mandibular second molar impaction and molar movements (tip and apex) over approximately 1.8 years.
  • Concurrent rapid palatal expansion (RPE) in the maxilla was noted.

Main Results:

  • Second molar impaction occurred in 11.9% of patients.
  • Most impactions were resolved with spacers (5 patients) or surgical correction (2 patients); one self-corrected.
  • Mandibular first molars showed significant forward migration of the tip and apex.

Conclusions:

  • Lip bumper therapy is associated with an increased risk of mandibular second molar impaction.
  • These impactions are generally manageable and resolvable with conservative or surgical interventions.