IADR Abstract Archives
Measurement in Le Fort I Osteotomy Using CBCT
Objectives: The aims of this study were to evaluate surgical angles for tuberosity dysjunction and linear and angular measurements for all horizontal cuts in Le Fort I osteotomy to avoid potential damage to the descending palatine artery using cone-beam computed tomography (CBCT).
Methods: This study included 189 CBCT scans to assess six surgical angles on three different sites distal to maxillary second molars relative to the mid-sagittal plane (MSP) and the buccal cortical plane (BCP) for tuberosity dysjunction.
Results: The mean surgical angles for tuberosity dysjunction varied from 58.90° to 95.28° and 74.85° to 100.93° according to the MSP and the BCP, respectively. For horizontal cuts, mean lengths (angles) for posterior buccal and lateral nasal wall osteotomies were 27.44mm (13.62°) and 33.20mm (9.60°), respectively, and a mean length of 47.12mm was measured for nasal septum osteotomy. Additionally, the presence of impacted third molar resulted in significantly higher mean surgical angles than those with fully erupted or without third molars.
Conclusions: Overall, angles running through the buccal midpoint of third molars relative to the MSP (76.56°) or the BCP (92.31°) might be the most appropriate in clinical practice. Furthermore, some caution seems warranted when performing tuberosity dysjunction with impacted third molars.
Methods: This study included 189 CBCT scans to assess six surgical angles on three different sites distal to maxillary second molars relative to the mid-sagittal plane (MSP) and the buccal cortical plane (BCP) for tuberosity dysjunction.
Results: The mean surgical angles for tuberosity dysjunction varied from 58.90° to 95.28° and 74.85° to 100.93° according to the MSP and the BCP, respectively. For horizontal cuts, mean lengths (angles) for posterior buccal and lateral nasal wall osteotomies were 27.44mm (13.62°) and 33.20mm (9.60°), respectively, and a mean length of 47.12mm was measured for nasal septum osteotomy. Additionally, the presence of impacted third molar resulted in significantly higher mean surgical angles than those with fully erupted or without third molars.
Conclusions: Overall, angles running through the buccal midpoint of third molars relative to the MSP (76.56°) or the BCP (92.31°) might be the most appropriate in clinical practice. Furthermore, some caution seems warranted when performing tuberosity dysjunction with impacted third molars.