AI Article Synopsis
- The study aimed to evaluate how the movement of mandibular first molars (MFM) relates to the angular changes of mandibular third molars (MTM) in orthodontic patients, comparing those who had teeth extracted versus those who did not.
- The research involved 100 patients aged 12-16, measuring changes using panoramic radiographs before and after treatment, with statistical analysis performed via STATA software.
- Results showed a significant correlation between MFM movement and MTM angular change in both extraction and non-extraction groups, with an average of 1mm of MFM movement leading to a 2.2-degree change in MTM, though no significant difference was found between the two patient groups.
Article Abstract
Objectives: The main objective of this study was to assess the relationship of the amount of mesial movement of mandibular first molar (MFM) and angular changes of the mandibular third molar (MTM) in orthodontic patients. The secondary objective of this study was to compare the obtained values in extraction and non-extraction orthodontic patients.
Material And Methods: In this cross-sectional retrospective study were enrolled all the eligible patients (12-16 years) with and without first premolar extraction that met the inclusion criteria. The angle between the longitudinal axis of MTM and horizontal reference plane (HRP) (to calculate the angular change of MTM), and the distance between the cementoenamel junction of the mesial surface of MFM and the bisector of the anterior nasal spine and nasal septum (to determine the amount of mesial movement of MFM) were measured on pre- and post-treatment panoramic radiographs. The correlation between the two variables was analysed and compared between extraction and non-extraction patients using STATA v. 14.2 software.
Results: A total of 100 fixed orthodontic patients with and without first premolar extraction (n=50) whose treatment had been accomplished were included in the study. In the non-extraction group, the mean amount of mesial movement of MFM was 1.45mm and the mean angular change of MTM was 4.28 degrees; this correlation was significant (P<0.05). These values were 2.98mm and 7.17 degrees in the first premolar extraction group, respectively, with a significant correlation (P<0.05). However, the difference in this respect was not significant between the two groups (P>0.05). According to the regression model, 1mm mesial movement of MFM would averagely cause 2.2-degree angular change in MTM, adjusting for the effect of extraction/non-extraction treatment plan.
Conclusion: The mesial movement of MFM was significantly correlated with the angular changes of MTM in extraction and non-extraction orthodontic patients, with no significant difference between them.
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| http://dx.doi.org/10.1016/j.ortho.2023.100779 | DOI Listing |
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