Evaluating Effectiveness Of Premolar Extraction On Mandibular Rotation
DOI:
https://doi.org/10.64252/g6sews91Keywords:
Premolar extraction, mandibular rotation, cephalometric analysis, vertical dimension, orthodontic treatment.Abstract
Background: Premolar extraction is a conventional orthodontic approach used to alleviate dental crowding and reduce protrusion. However, its impact on mandibular rotation remains a subject of clinical debate, particularly concerning changes in the vertical dimension and growth direction.
Aim:To evaluate the effects of premolar extraction on mandibular rotation patterns in orthodontic patients using cephalometric parameters.
Materials and Methods:A retrospective cephalometric study was conducted on 68 patients (42 females, 26 males; mean age 16.8 ± 2.4 years), including 34 patients treated with extraction of four first premolars and 34 non-extraction controls. Standardized lateral cephalograms were taken pre- and post-treatment. Cephalometric variables analyzed included SN-GoGn angle, FMA angle, Y-axis angle, Jarabak ratio, and lower anterior facial height (ANS-Me). Statistical analysis was performed using paired t-tests and intergroup comparisons.
Results:In the extraction group, changes in mandibular rotation parameters were minimal and statistically non-significant: SN-GoGn angle: +0.42 ± 1.8° (p = 0.186), FMA angle: +0.28 ± 1.4° (p = 0.243), Y-axis angle: +0.35 ± 1.2° (p = 0.164). The non-extraction group exhibited similarly negligible changes: ANS-Me increased by 1.2 ± 2.1 mm in extraction vs. 1.8 ± 2.3 mm in controls (p = 0.298), Jarabak ratio remained stable (62.4 ± 4.2% vs. 61.8 ± 3.9%, p = 0.542)
Conclusion:Premolar extraction does not significantly influence mandibular rotation patterns when appropriate orthodontic mechanics are utilized. These findings counter traditional concerns regarding vertical dimensional changes following extraction-based orthodontic therapy.
