Korean J Orthod.  2001 Feb;31(1):1-13.

Mandibular differential premolar extraction in growing patients

Affiliations
  • 1Department of Orthodontics, College of Medicine, Ulsan University, Korea. sdent25@hanmail.net

Abstract

The extraction for orthodontic treatment can be adopted for aligning crowded dentition, improving facial esthetics and solving a skeletal discrepancy as alternative for a surgical option. Mandibular second premolar extraction was often selected as treatment plan when there are very little or no space shortage in lower arch or limited retraction of the lower incisors was required. The primary object of this study was evaluate a pretreatment condition and examine the amount of tooth movement for a mandibular second premolar extraction in growing patients. Pretreatment and posttreatment lateral cephalograms of 14 cases that had their four first premolar extracted (4/4 group), 15 cases with upper first and lower second premolar extraction (4/5 group) were selected. Structural method superimposition was conducted to evaluate a difference of dental change between 4/4 and 4/5 group. The results were as follows, 1. Pretreatment factor for 4/4 extraction or 4/5 extraction choice included maxillary incisor axis to occlusal plane, Class II molar relationship, IMPA and interincisal angle. 2. The amount of molar anterior movement in 4/5 group was greater than that of 4/4 group(p<0.05). 3. There was no significant difference between 4/4 group and 4/5 group in aspects of maxillary tooth movement(p<0.05).

Keyword

differential premolar extraction; stable bone structure

MeSH Terms

Axis, Cervical Vertebra
Bicuspid*
Dental Occlusion
Dentition
Esthetics
Humans
Incisor
Molar
Tooth
Tooth Movement
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