ABSTRACT
Aim: To evaluate the accuracy and the validity of orthodontic diagnostic measurements, as well as virtual tooth transformations using a generic open access 3D software compared to OrthoAnalyzer (3Shape) software; which was previously tested and proven for accuracy. Methods: 40 maxillary and mandibular single arch study models were duplicated and scanned using 3Shape laser scanner. The files were imported into the generic and OrthoAnalyzer software programs; where linear measurements were taken twice to investigate the accuracy of the program. To test the accuracy of the program format, they were printed, rescanned and imported into OrthAnalyzer. Finally, to investigate the accuracy of editing capabilities, linear and angular transformation procedures were performed, superimposed and printed to be rescanned and imported to OrthoAnalyzer for comparison. Results: There was no statistically significant difference between the two groups using the two software programs regarding the accuracy of the linear measurements (p>0.05). There was no statistically significant difference between the different formats among all the measurements, (p>0.05). The editing capabilities also showed no statistically significant difference (p>0.05). Conclusion: The generic 3D software (Meshmixer) was valid and accurate in cast measurements and linear and angular editing procedures. It can be used for orthodontic diagnosis and treatment planning without added costs
Subject(s)
Software , Casts, Surgical , Imaging, Three-Dimensional , Models, DentalABSTRACT
OBJECTIVE: The present study was designed to investigate the effect of hyperbaric oxygen therapy (HBO2T) on improving bony stability in LeFort I maxillofacial surgery. METHODS: Sixteen cases (n = 16) with severe skeletal anteroposterior discrepancies and who had ceased growing were used as subjects. The samples were categorized into two groups: Group A comprised one-piece LeFort I procedures with HBO2T administered seven days after surgery (n = 8), and Group B comprised the same surgical procedure without HBO2T (n = 8). Lateral cephalometric radiographs were taken for each subject to record the occurrence of bony relapse: prior to surgery (T1); seven days after surgery (T2); and a third (T3) taken 12 months after surgery. Each patient underwent preoperative and postoperative full-fixed orthodontic treatment. The first group was administered HBO2T for 60 minutes, at 2.5 ATA (atmospheres absolute) for five consecutive days after the T2 stage, and the second group served as a control, as they had not received HBO2T. For both groups the mean values of T1 stages were calculated and compared to those of T2 and T3 stages in the same group. RESULTS: Comparison between the two groups regarding the percentage of change in measurements at T2 and at T3 showed that there were significant differences between groups in all measurements at T3. In the HBO2T group, there was no statistical significant difference in all parameters between the mean values of T2 and T3, indicating minor or no relapse. Meanwhile in the group without HBO2T, there was a highly significant statistical difference in the mean values between T2 and T3 in all studied parameters, indicating significant relapse. CONCLUSIONS: It is suggested that administration of hyperbaric oxygen therapy may aid in the postoperative stability of orthognathic LeFort I surgical corrections of patients with severe dentofacial deformities.
