PubMed · 15356493
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James Mah, David Hatcher. 2004. Three-dimensional craniofacial imaging.. https://doi.org/10.1016/j.ajodo.2004.06.024
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METHODS: We reviewed the cases of 11 children <12 years of age with complex medical conditions and respiratory failure requiring chronic positive pressure ventilation (CPPV). We conducted a within-group comparison of average head circumference (HC) percentiles with each child's age-expected 50th percentile value and a between-groups comparison with children with no history of ventilation. We examined the relationship between HC, peak levels of positive inspiratory pressure (PIP), and length of time on CPPV. RESULTS: We found that children on CPPV had an average HC value at the 71st percentile, significantly greater (p=0.009) than the age-expected 50th percentile; that children on CPPV had a greater (p=0.003) average HC percentile compared with children with complex medical conditions not on CPPV; and that peak levels of PIP had a moderately strong correlation to HC (r=0.689, p=0.019). CONCLUSION: We conclude that children on CPPV have larger than expected HC and HC appears related to the peak level of PIP. Research to further investigate the relationship between HC and CPPV in children appears to be warranted.
Seventy-three children with submucous cleft palate (34 girls and 39 boys) with a mean age of 6.2 years (range 5.5-7.5) were compared retrospectively from lateral cephalograms. Thirty of the patients were not operated on, while 43 had had either palatal closure (n = 13, mean age at operation: 1.7 years, range 0.8-3.9) or velopharyngeal flap (VPP) surgery (n = 30, mean age at operation 3.7 years, range 1-6.8). There were no significant differences in the pharyngeal dimensions between girls and boys or patients without surgery and with palatal repair. Patients who had had VPP had the largest sagittal depths of the nasopharyngeal airway and smallest sagittal depths of the oropharyngeal airway. VPP in childhood was associated with narrowing of the lower pharyngeal airway.
AIM: To simulate the surgery of dysgnathia, several forms of computer software allowing two-dimensional 'virtual' planning are frequently used. However, in many cases it is not possible to transfer the virtual plan accurately to the surgical site. It is the purpose of this study to find the errors likely to occur when transferring the data. METHODS: In 22 bimaxillary osteotomies for dysgnathia, the results of preoperative planning were compared with the surgical outcomes. The programme WinCeph 4.19 (Compudent) was used for cephalometric analyses and simulation of the operations. RESULTS: Six major skeletal parameters were evaluated when comparing both the planned and the actual outcome, and the following results were recorded: Delta-SNA 1.53 degrees (+/-1.20), Delta-SNB 1.67 degrees (+/-1.29), Delta-ANB 1.62 degrees (+/-1.47), Delta-NL-NSL 3.9 degrees (+/-2.30), Delta-ML-NSL 3.6 degrees (+/-3.7) and Delta-ArGoMe 6.1 degrees (+/-4.6). CONCLUSION: It was anticipated that the most important differences between planned and surgical outcomes were found to be in the vertical changes. Planning and data transfer was comparatively accurate with regard to sagittal data. Apart from several mechanical methods for data transfer, systems using navigation are therefore being discussed and used increasingly. They ensure accurate data transfer to the surgical site.