METHODS: Totally 80 mandibular displacements were performed on 20 fresh cadavers, for each subject, four splints were produces to facilitate mandibular advancement as well as setbacks of 4 and 8 mm. Pre- and postoperative CBCT scans were performed to plan the surgical procedures and to analyze the expected and achieved BCA and ICD.
RESULTS: Regarding the maximum mandibular displacement, the expected BCA for HSSO/BSSO were 352.58 ± 96.55mm2 and 1164.00 ± 295.50mm2, respectively, after advancement and 349.11 ± 98.42mm2 and 1344.70 ± 287.23mm2, respectively, after setback. The achieved BCA for HSSO/BSSO were 229.37 ± 75.90mm2 and 391.38 ± 189.01mm2, respectively, after advancement and 278.03 ± 97.65mm2 and 413.52 ± 169.52 mm2, respectively after setback. The expected ICD for HSSO/BSSO were 4.51 ± 0.73 mm and 3.25 ± 1.17 mm after advancement and - 5.76 ± 1.07 mm and - 4.28 ± 1.58 mm after setback. The achieved ICD for HSSO/BSSO were 2.07 ± 2.9 mm and 1.7 ± 0.60 mm after advancement and - 2.57 ± 2.78 mm and - 1.28 ± 0.84 mm after setback. Significant differences between the BCA after HSSO and BSSO were at each displacement (p < 0.001), except for the achieved BCA after 8-mm setback and advancement (p ≥ 0.266). No significant differences were observed regarding ICD, except for the expected ICD after 8-mm setback and advancement (p ≤ 0.037).
CONCLUSIONS: Compared to the virtual planning, the predictability regarding BCA and ICD was limited. ICD showed smaller clinical changes, BCA decreased significantly in the BSSO group.
CONCLUSIONS: BCA and ICD might have been less important in choosing the suitable split technique. in orthognathic surgery.
方法:对20具新鲜尸体进行80次下颌移位,对于每个主题,生产四个夹板以促进下颌前移以及4和8毫米的挫折。术前和术后进行CBCT扫描以计划手术程序并分析预期和实现的BCA和ICD。
结果:关于下颌最大位移,HSSO/BSSO的预期BCA分别为352.58±96.55mm2和1164.00±295.50mm2,推进后,分别为349.11±98.42mm2和1344.70±287.23mm2,挫折后。HSSO/BSSO的BCA分别为229.37±75.90mm2和391.38±189.01mm2,推进后和挫折后分别为278.03±97.65mm2和413.52±169.52mm2。HSSO/BSSO的预期ICD在前进后为4.51±0.73mm和3.25±1.17mm,在后退后为-5.76±1.07mm和-4.28±1.58mm。HSSO/BSSO的ICD在前进后达到2.07±2.9mm和1.7±0.60mm,在后退后达到-2.57±2.78mm和-1.28±0.84mm。HSSO和BSSO后的BCA之间的显着差异在每个位移(p<0.001),除了在8毫米后退和前进后达到的BCA(p≥0.266)。关于ICD没有观察到显著差异,除了8-mm挫折和推进后的预期ICD(p≤0.037)。
结论:与虚拟规划相比,BCA和ICD的可预测性有限.ICD显示较小的临床变化,BSSO组BCA显著下降。
结论:BCA和ICD在选择合适的拆分技术方面可能不太重要。在正颌手术中。