Changes of the Mandible after Orthodontic Treatment with and without Extraction of Four Premolars
Abstract:
Objectives
This study was designed to assess the changes of the mandible of patients who underwent orthodontic treatment with or without extraction of four premolars.
Materials And Methods
Eighteen Class I bimaxillary protrusion patients treated with extraction of four first premolars and retraction of anterior teeth and 18 Class I non-extraction patients with a mean age of 16.38±0.4 years were selected. Cephalometric analysis was performed before and after treatment. Twenty-four variables for analyzing the hard and soft tissues of the mandible were compared between the two groups. Repeated measures ANOVA was used for the comparison of the two groups fallowed by paired t-test. The relationship between the soft and hard tissue variables was studied using the Pearson’s correlation coefficient.
Results
In both groups, the mean value of angular measurements related to B point and Pogonion (Pog) decreased with treatment (P
Conclusions
Points B and Pog showed backward movement after orthodontic treatments in both extraction and non-extraction patients. Changes in B’ and Pog’ were directly influenced by the changes in the corresponding points of the underlying hard tissue. Orthodontic treatments with and without extraction of premolars produced insignificant changes in vertical facial dimension.
Language:
English
Published:
Frontiers in Dentistry, Volume:13 Issue: 3, May 2016
Pages:
199 to 206
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