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E-space preservation.

Andrew Sonis¹, Marc Ackerman

¹Children's Hospital, Boston, MA 02115, USA. Andrew.Sonis@childrens.harvard.edu

The Angle Orthodontist

|May 27, 2011

Summary

This summary is machine-generated.

E-space preservation with lingual holding arches significantly increases the risk of mandibular second molar impaction. Pretreatment angulation between mandibular molars is a key predictor of this impaction risk.

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Area of Science:

Orthodontics
Dental Development

Background:

E-space preservation is a common orthodontic technique.
Mandibular permanent second molar impaction is a potential complication.

Purpose of the Study:

To investigate the relationship between E-space preservation using lingual holding arches and mandibular permanent second molar impaction.
To identify risk factors for this impaction.

Main Methods:

Study included 200 patients undergoing nonextraction treatment for incisor crowding.
E-space was preserved using passive lingual arches.
Panoramic and cephalometric radiographs were analyzed for impaction and related factors.

Main Results:

14.5% of patients (8.5% of molars) experienced second molar impaction.

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Impaction was significantly associated with mandibular first molar-second molar angulation (P < .001).

A pretreatment intermolar angulation of 24 degrees predicted impaction with a positive predictive value of 1.

Conclusions:

Mandibular second molar impaction is 10-20 times more prevalent with this treatment approach compared to the general population.
Pretreatment intermolar angulation is the strongest predictor of impaction risk.