Influence of first premolar extraction on second and third molar angulation - A clinical study.
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Date
2015-01
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Abstract
ABSTRACT
Background: In modern populations, the impaction rate is higher for
third molars than for any other tooth. Due to the speculation of third
molar role on late incisor crowding, many orthodontists prescribe
removal of third molars before, during or just after orthodontic
treatment.
Objectives: The aim of this study was to compare whether orthodontic
extraction of first premolar lead to any angular changes in second and
third molars.
Material and method: Orthopantograms of 20 patients undergoing
orthodontic treatment were collected pre and post treatment. The
patients were divided into two groups – nonextraction and extraction
group. Each group consisted of 10 patients. The angles were measured
between the long axis of 2nd molar and 3rd molar with horizontal
plane. Changes in 2nd and 3rd molar angulation from pre-treatment to
post treatment for two groups were compared by Mann- Whitney utest.
Results: Statistical analysis revealed that maxillary and mandibular 2nd
and 3rd molar showed an improvement in angulation but it was
statistically non-significant.
Conclusion: The findings of the present investigation suggest that
premolar extraction therapy has a favourable effect on maxillary
second & third molar angulation, while no changes in mandibular
second & third molar angulation during treatment were found in
patients treated with and without premolar extractions.
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Keywords
Extraction, 2nd molar, 3rd molar angulation, orthodontic treatment, 1st premolar
Citation
Tarvade SMT, Biday S. Influence of first premolar extraction on second and third molar angulation - A clinical study. International Journal of Medical and Dental Sciences. 2015 Jan; 4(1): 560-567.