ABSTRACT
Objective:The purpose of the study was to evaluate and compare hand tracings on conventional lateral cephalograms with different calibration techniques available in dolphin imaging on digital lateral cephalogram. Materials and Methods:50 Conventional lateral cephalogram and 50 digital lateral cephalogram were taken in (NHP) at same period of timeon the same patient. Two angular measurements Facial Axis Angle and ANB angle two linear measurements Sella to Nasion and Sella to articulare have been taken. The digital images were traced by calibration 3 techniques Ruler, DPI and Land mark available in Dolphin Imaging Software Version 11.5.The conventional were traced on lead acetate paper and data has been collected.Results: In measurement of Facial Axis Angle conventional when compared with different calibration techniques Ruler Land Mark technique show <0.001significantvalue. In measurement of ANB angle shows no significant values. In measurement of S-N length Ruler compared with DPI has shown significant p value <0.001. DPI compared with conventional shows 0.001. S-AR length has shown significant value p value 0.006, DPI compared with Landmark shows 0.007,Landmark compared with conventional shows 0.003. Conclusion: According to our study conventional when compared with calibration techniques ruler has show only one significant value DPI and land mark has shown two significant values so our study conclude that using ruler is the better option for calibration of digital radiograph. As ruler is more accurate to conventional we compare DPI and Landmark techniques to ruler, landmark shows less variation with ruler so according to our study the second option for calibration of digital radiograph is landmark and last option comes DPI.
ABSTRACT
The purpose of this study was to compare the differences in measurements between cephalometric radiographs an digigraphs of Dolphin Imaging System. 26 Korean adult male and 24 adult female with normal occlusion were selected. For each subject lateral cephalogram was taken. Digitizing with Digigraph Work Station of Dolphin Imaging System was performed as well. 50 tracings and 50 digigraphs were analyzed with Yonsei, Ricketts, Burstone analyses. The comparable measurements between tracing group and digigraph group were statistically analyzed. The results were as follows: 1. 13 of 64 comparable measurements did not show any statistically significant difference (P>0.05) between tracing group and digigraph group. 2. Three of the measurements with FH plane as a reference plane did not show any statistically insignificant difference. All measurement with SN plane as a reference plane showed statistically significant difference(p<0.05) 3. The measurements which showed no statistically significant difference were mostly short distance linear measurements while most of the angular measurements showed statistically significant difference(p<0.05).