Changes in Mandibular Alveolar Bone Thickness Following All 4s and All 5s Premolar Extraction In Bimaxillary Protrusion Cases: A CBCT Study
Background: Bimaxillary protrusion is a common orthodontic condition characterized by excessive forward positioning of both the maxilla and mandible. The treatment often involves premolar and molar extractions to achieve optimal alignment and retraction. Cone-beam computed tomography (CBCT) offers a...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2025-06-01
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| Series: | Journal of Pharmacy and Bioallied Sciences |
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| Online Access: | https://journals.lww.com/10.4103/jpbs.jpbs_143_25 |
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| author | Neha Rathore Rashme Rashme P. M. Roveena N. Lingeshkumar Mariea Francis S. Vikram |
| author_facet | Neha Rathore Rashme Rashme P. M. Roveena N. Lingeshkumar Mariea Francis S. Vikram |
| author_sort | Neha Rathore |
| collection | DOAJ |
| description | Background:
Bimaxillary protrusion is a common orthodontic condition characterized by excessive forward positioning of both the maxilla and mandible. The treatment often involves premolar and molar extractions to achieve optimal alignment and retraction. Cone-beam computed tomography (CBCT) offers a precise method to evaluate changes in mandibular alveolar bone morphology following such extractions. This study aims to compare the morphological changes in the mandibular alveolar bone following 4-premolar and 5-premolar/molar extractions in patients with bimaxillary protrusion.
Materials and Methods:
A total of 40 patients with bimaxillary protrusion were selected for this study and divided into two groups: Group A (n = 20) underwent 4-premolar extractions, while Group B (n = 20) underwent 5th premolar/molar extractions. CBCT scans were taken pre-treatment and 12 months post-treatment. Key parameters assessed included alveolar bone height, thickness at different root levels (3 mm, 6 mm, and 9 mm from the cementoenamel junction), and cortical bone thickness. Statistical analysis was performed using paired t-tests and independent t-tests, with a significance level set at P < 0.05.
Results:
Group A showed a significant reduction in alveolar bone thickness at all root levels, with mean reductions of 1.2 mm (±0.3), 1.5 mm (±0.4), and 1.8 mm (±0.5) at 3 mm, 6 mm, and 9 mm, respectively. Group B demonstrated similar reductions but with slightly higher values: 1.4 mm (±0.4), 1.7 mm (±0.5), and 2.0 mm (±0.6). Alveolar bone height decreased significantly in both groups, with a greater reduction observed in Group B (mean decrease of 2.5 mm versus 1.9 mm in Group A). Cortical bone thickness changes were minimal and statistically insignificant in both groups.
Conclusion:
Both 4-premolar and 5-premolar/molar extractions lead to significant changes in mandibular alveolar bone morphology. However, 5th premolar/molar extractions result in slightly greater reductions in alveolar bone height and thickness. CBCT provides a reliable method for monitoring these changes, emphasizing the need for careful planning in extraction-based orthodontic treatment. |
| format | Article |
| id | doaj-art-7e2c8dedb01b48f3adf10f4f29c56185 |
| institution | Kabale University |
| issn | 0976-4879 0975-7406 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Pharmacy and Bioallied Sciences |
| spelling | doaj-art-7e2c8dedb01b48f3adf10f4f29c561852025-08-20T03:31:38ZengWolters Kluwer Medknow PublicationsJournal of Pharmacy and Bioallied Sciences0976-48790975-74062025-06-0117Suppl 2S1586S158810.4103/jpbs.jpbs_143_25Changes in Mandibular Alveolar Bone Thickness Following All 4s and All 5s Premolar Extraction In Bimaxillary Protrusion Cases: A CBCT StudyNeha RathoreRashme RashmeP. M. RoveenaN. LingeshkumarMariea FrancisS. VikramBackground: Bimaxillary protrusion is a common orthodontic condition characterized by excessive forward positioning of both the maxilla and mandible. The treatment often involves premolar and molar extractions to achieve optimal alignment and retraction. Cone-beam computed tomography (CBCT) offers a precise method to evaluate changes in mandibular alveolar bone morphology following such extractions. This study aims to compare the morphological changes in the mandibular alveolar bone following 4-premolar and 5-premolar/molar extractions in patients with bimaxillary protrusion. Materials and Methods: A total of 40 patients with bimaxillary protrusion were selected for this study and divided into two groups: Group A (n = 20) underwent 4-premolar extractions, while Group B (n = 20) underwent 5th premolar/molar extractions. CBCT scans were taken pre-treatment and 12 months post-treatment. Key parameters assessed included alveolar bone height, thickness at different root levels (3 mm, 6 mm, and 9 mm from the cementoenamel junction), and cortical bone thickness. Statistical analysis was performed using paired t-tests and independent t-tests, with a significance level set at P < 0.05. Results: Group A showed a significant reduction in alveolar bone thickness at all root levels, with mean reductions of 1.2 mm (±0.3), 1.5 mm (±0.4), and 1.8 mm (±0.5) at 3 mm, 6 mm, and 9 mm, respectively. Group B demonstrated similar reductions but with slightly higher values: 1.4 mm (±0.4), 1.7 mm (±0.5), and 2.0 mm (±0.6). Alveolar bone height decreased significantly in both groups, with a greater reduction observed in Group B (mean decrease of 2.5 mm versus 1.9 mm in Group A). Cortical bone thickness changes were minimal and statistically insignificant in both groups. Conclusion: Both 4-premolar and 5-premolar/molar extractions lead to significant changes in mandibular alveolar bone morphology. However, 5th premolar/molar extractions result in slightly greater reductions in alveolar bone height and thickness. CBCT provides a reliable method for monitoring these changes, emphasizing the need for careful planning in extraction-based orthodontic treatment.https://journals.lww.com/10.4103/jpbs.jpbs_143_25alveolar morphologybimaxillary protrusioncbctmandibular alveolar bonemolar extractionsorthodontic treatmentpremolar extractions |
| spellingShingle | Neha Rathore Rashme Rashme P. M. Roveena N. Lingeshkumar Mariea Francis S. Vikram Changes in Mandibular Alveolar Bone Thickness Following All 4s and All 5s Premolar Extraction In Bimaxillary Protrusion Cases: A CBCT Study Journal of Pharmacy and Bioallied Sciences alveolar morphology bimaxillary protrusion cbct mandibular alveolar bone molar extractions orthodontic treatment premolar extractions |
| title | Changes in Mandibular Alveolar Bone Thickness Following All 4s and All 5s Premolar Extraction In Bimaxillary Protrusion Cases: A CBCT Study |
| title_full | Changes in Mandibular Alveolar Bone Thickness Following All 4s and All 5s Premolar Extraction In Bimaxillary Protrusion Cases: A CBCT Study |
| title_fullStr | Changes in Mandibular Alveolar Bone Thickness Following All 4s and All 5s Premolar Extraction In Bimaxillary Protrusion Cases: A CBCT Study |
| title_full_unstemmed | Changes in Mandibular Alveolar Bone Thickness Following All 4s and All 5s Premolar Extraction In Bimaxillary Protrusion Cases: A CBCT Study |
| title_short | Changes in Mandibular Alveolar Bone Thickness Following All 4s and All 5s Premolar Extraction In Bimaxillary Protrusion Cases: A CBCT Study |
| title_sort | changes in mandibular alveolar bone thickness following all 4s and all 5s premolar extraction in bimaxillary protrusion cases a cbct study |
| topic | alveolar morphology bimaxillary protrusion cbct mandibular alveolar bone molar extractions orthodontic treatment premolar extractions |
| url | https://journals.lww.com/10.4103/jpbs.jpbs_143_25 |
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