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Changes in Mandibular Third Molar Angulation in High-anchorage Extraction vs Non-extraction Orthodontic Treatment: A
Swati Singh1, Arun K Garg2, Deepak K Gupta2
1Department of Orthodontics and Dentofacial Orthopedics, Dr Harvansh Singh Judge Institute of Dental Sciences and Hospital, Panjab University, Chandigarh, India, Phone: +91 8872362240,
The Journal of Contemporary Dental Practice
|March 9, 2021
Summary
First premolar extraction in high anchorage orthodontic cases worsens mandibular third molar angulation. Patients undergoing this treatment should be aware that their third molar angulation may not improve and could worsen.
Area of Science:
- Orthodontics
- Dental Imaging
- Oral Surgery
Background:
- Assessing changes in mandibular third molar angulation is crucial in orthodontic treatment planning.
- High anchorage cases often involve complex tooth movements and potential impacts on third molars.
Purpose of the Study:
- To compare prospective changes in mandibular third molar angulation.
- To evaluate the effects of first premolar extraction versus non-extraction in high anchorage orthodontic cases.
Main Methods:
- 56 non-growing patients were divided into extraction (n=26) and non-extraction (n=30) groups.
- Panoramic radiographs were taken at multiple time points (pre-, mid-, and post-treatment).
- Measurements included angles between second molars (M2), third molars (M3), and a horizontal reference plane (HRP).
Main Results:
- Significant increases in M2-M3 angulation were observed bilaterally in the extraction group and on the right side in the non-extraction group.
- M3-HRP angulation showed a non-significant worsening trend in the extraction group.
- No statistically significant intergroup differences were found for M2-HRP, M3-HRP, or M2-M3 angulations.
Conclusions:
- Extraction therapy in high anchorage cases does not improve, and may worsen, mandibular third molar angulation.
- Prospective orthodontic patients should be informed about the potential negative impact on third molar angulation with premolar extraction in high anchorage cases.
