IADR Abstract Archives
Mandibular Alveolar Bone Remodeling Following Maximum Incisor Retraction
Objectives: The objective of this study is to evaluate changes in mandibular alveolar bone width following maximum incisor retraction.
Methods: Thirty consecutive patients with bimaxillary dentoalveolar protrusion treated with premolar extractions and maximum incisor retraction using skeletal anchorage were selected. Pre-treatment (T1) and post-treatment (T2) Cone Beam Computed Tomography (CBCT) volumes were registered using voxel-based mandible regional superimpositions. Three-dimensional (3D) models of the registered mandibles were built, and T1 and T2 alveolar width were measured at the 1) inter-radicular space between the lower central incisors and the 2) mid-root of the mandibular right central incisor. ANOVA analysis was used to determine difference between T1 and T2 alveolar width.
Results: The mean lower incisor retraction was 7.33mm ± 1.52. The inter-radicular alveolus showed an average decrease of 1.43mm ± 1.00 (24% reduction) while the mid-root alveolus showed an average decrease of 0.90mm ± 0.48 (14% reduction) after incisor retraction. There was a statistically significant difference (p = 0.05) between the bone change at the inter-radicular regions compared to the mid-root regions.
Conclusions: There was a decrease in buccal/lingual width of the alveolus following maximum incisor retraction. The reduction of alveolar width was more significant in the inter-radicular region.
Methods: Thirty consecutive patients with bimaxillary dentoalveolar protrusion treated with premolar extractions and maximum incisor retraction using skeletal anchorage were selected. Pre-treatment (T1) and post-treatment (T2) Cone Beam Computed Tomography (CBCT) volumes were registered using voxel-based mandible regional superimpositions. Three-dimensional (3D) models of the registered mandibles were built, and T1 and T2 alveolar width were measured at the 1) inter-radicular space between the lower central incisors and the 2) mid-root of the mandibular right central incisor. ANOVA analysis was used to determine difference between T1 and T2 alveolar width.
Results: The mean lower incisor retraction was 7.33mm ± 1.52. The inter-radicular alveolus showed an average decrease of 1.43mm ± 1.00 (24% reduction) while the mid-root alveolus showed an average decrease of 0.90mm ± 0.48 (14% reduction) after incisor retraction. There was a statistically significant difference (p = 0.05) between the bone change at the inter-radicular regions compared to the mid-root regions.
Conclusions: There was a decrease in buccal/lingual width of the alveolus following maximum incisor retraction. The reduction of alveolar width was more significant in the inter-radicular region.
