Master of Science (M.S.) in Dentistry
College of Dental Medicine
Publication Date / Copyright Date
Nova Southeastern University
Glenn Krieger. 2014. Cephalometric regional superimpositions -- digital vs. analog accuracy and precision : 1. the maxilla. Master's thesis. Nova Southeastern University. Retrieved from NSUWorks, College of Dental Medicine. (58)
Introduction: The purpose of this study was to measure the displacement of defined dental structures, as a result of superimposition of cephalometric images across paired time-points by both digital and analog methods. The magnitudes of such displacements across three methods of superimposition were compared to each other and to a reference method constructed by registering superimposed cephalometric images on tantalum markers implanted in the study participants' maxillae. The defined dental structures were: 1) First molar mesial contact point; 2) First molar apical root bisection; 3) Central incisor root apex; 4) Central incisor crown incisal edge. Methods: Lateral cephalograms of 22 patients containing tantalum implants from the Mathews acquisition group were digitized, traced and superimposed using analog (implant and structural) and digital (Dolphin and QuickCeph) methods. Superimpositions were exported to Adobe Photoshop where they were scaled and displacement of defined dental landmarks measured using a Cartesian coordinate system. A random-effects, generalized linear model with Bonferroni adjustment was used to compare the different methods. Results: The structural method (p < 0.01) showed statistically significant differences versus the implant method and demonstrated the smallest 95% confidence interval range compared to Quick Ceph and Dolphin (0.45mm, 0.75mm, and 0.95mm, respectively). The four structural method landmarks demonstrated statistically significant differences versus the implant method (p<0.05) and had smaller 95% confidence interval ranges compared to the corresponding landmarks for Dolphin and Quick Ceph. Conclusions: Our study demonstrated that there are differences in the accuracy of digital and analog methods of maxillary regional serial superimposition. Structural, Dolphin and Quick Ceph methods showed a mean overall displacement of defined dental structures within 0.5mm of the displacement measured against implant-registered superimposition (reference method). Only the structural method demonstrated a statistically significant difference compared to the implant method and also exhibited the smallest standard error relative to the mean for every measurement. The low power of this study (0.18) and large standard errors relative to the means for the digital methods suggests that a larger sample size may result in significant differences regarding Dolphin and Quick Ceph vs. implant methods.
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