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AbstractBackground: The purpose of this study was to measure the time of the conventional surgical planning (CSP) andvirtual surgical planning (VSP) in orthognathic surgery and to compare them in terms of cost. Material and method: This is a retrospective study of the patients who underwent orthognathic surgery at thePusan National University Dental Hospital from December 2017 to August 2018. All the patients were analyzedthrough both CSP and VSP, and all the surgical stents were fabricated through manual and three-dimensional (3D)printing. The predictor variables were the planning method (CSP vs. VSP) and the surgery type (group I: Le Fort Iosteotomy + bilateral sagittal split osteotomy [LFI+BSSO] or group II: only bilateral sagittal split osteotomy [BSSO]),and the outcomes were the time and cost. The results were analyzed using the paired t test. Results: Thirty patients (12 females, 18 males) met the inclusion criteria, and 17 patients were excluded from thestudy due to missing or incomplete data. There were 20 group I patients (LFI+BSSO regardless of genioplasty) and10 group II patients (BSSO regardless of genioplasty). The average time of CSP for group I was 385 ± 7.8 min, andthat for group II was 195 ± 8.33 min. The time reduction rate of VSP compared with CSP was 62.8% in group I and41.5% in group II. On the other hand, there was no statistically significant cost reduction. Conclusions: The time investment in VSP in this study was significantly smaller than that in CSP, and the differencewas greater in group I than in group II.

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