Accuracy of different methods of radiographic superimposition on cranial base structures

Houston, W. J. B.; Lee, R. T.

doi:10.1093/ejo/7.2.127

Cited by 28 publications

(28 citation statements)

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“…[29][30][31][32][33] Some of them are inherent and unavoidable, but there are also error sources that can be overcome. These include the selection of stable reference landmarks to be used and standardization of calibration.…”

Section: Discussionmentioning

confidence: 99%

Longitudinal growth changes of the cranial base from puberty to adulthood

Arat¹,

Türkkahraman²,

English³

et al. 2010

The Angle Orthodontist

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Objective: To investigate the stability of cranial reference landmarks from puberty through adulthood and to compare the displacement of these landmarks among the superimposition methods of Bjö rk, Ricketts, Steiner, and the proposed tuberculum sella-wing (T-W) reference line. Materials and Methods: The sample consisted of serial lateral cephalometric radiographs of 30 Class II division 1 patients taken at the pretreatment (T1; mean age, 11.98 years), posttreatment (T2; mean age, 15.32 years) and postretention (T3; mean age, 32.12 years) periods. All cephalometric radiographs were superimposed at the cranial base according to the overall superimposition methods of Bjö rk, Ricketts, Steiner, and the T-W method. The horizontal and vertical displacements of cranial landmarks (nasion, wing, tuberculum sella, sella, basion, and pterygomaxillare) were assessed by paired t-test according to Bjö rk's structural method. One-way analysis of variance (ANOVA) was used for comparison of the displacement of cranial landmarks among the superimposition methods. Results: The tuberculum sella and wing were the most stable cranial landmarks of the cranial base. The stability of sella and pterygomaxillare points were somewhat questionable. Nasion and basion were highly variable. The displacements of all cranial landmarks were similar between the Bjö rk and T-W methods in all study periods. Most of the cranial landmarks displaced similarly in the horizontal direction among the methods. Vertically, the behaviors of the cranial landmarks were frequently different. Conclusions: T-W is the most similar superimposition method to Bjö rk's structural method; thus, it is a reliable method for examining overall facial changes. (Angle Orthod. 2010;80:725-732.)

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Section: Discussionmentioning

confidence: 99%

Longitudinal growth changes of the cranial base from puberty to adulthood

Arat¹,

Türkkahraman²,

English³

et al. 2010

The Angle Orthodontist

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“…However, it is difficult to quantitatively compare superimposition error studies because of the many different methods used to calculate and describe the errors. 27 Few studies have reported the accuracy of digitally produced superimpositions. Two other studies agree with the results of our study in finding that digital superimpositions produced by computer-based programs are similar to those produced by hand.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Hand-Traced and Computer-Based Cephalometric Superimpositions

Huja

Grubaugh

Rummel

et al. 2009

The Angle Orthodontist

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Objective: To determine the ability to produce comparable superimpositions using hand tracing and digital methods (Dolphin v10). In addition, if the two methods were comparable, we wanted to determine if a difference existed between the best-fit cranial base superimposition and S-N superimpositions using the digital method. Methods and Materials: Sixty-four initial (T 1 ) and final (T 2 ) cephalometric film radiographs were obtained. Cranial base and regional superimpositions were completed independently for each pair of radiographs by either hand tracing and digital methods. To quantitatively evaluate the differences between the two methods, the hand and digital superimpositions were digitized to obtain x-y coordinates of routine cephalometric landmarks at T 2 . Linear distance between multiple corresponding (hand and digital) T 2 cephalometric landmark locations (e.g., A point) were measured and defined as the T 2 landmark distance (T 2 LD). Additionally, 61 patient records were used to compare the digital method for best-fit cranial base superimpositions versus S-N superimpositions. A Friedman test was applied to examine for differences. Results: The upper 95% confidence limit for the mean of the T 2 LD for hand and digital superimposition methods was Ͻ1 mm for all landmarks except maxillary incisor tip and apex. The upper 95% confidence interval for best-fit vs S-N was Ͼ1 mm for most landmarks. Conclusion: This study validates the use of superimpositions produced by Dolphin Imaging version 10 and is a necessary step forward toward widespread acceptance of digital superimpositions. (Angle Orthod. 2009;79:428-435.)

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“…Commonly used ceph alometric analyses focus primarily on diagnosis and treatment planning. 7 Ideally, a degree of overcorrection of the excessive overjet may be produced during the functional phase to compensate for expected relapse. This complicates assessment of interrelationships bet ween skeletal and dental components that contribute to occlusal changes.…”

Section: Cephalometric Superimpositionmentioning

confidence: 99%

Transferring from functional to fixed appliances

2016

Orthodontic Functional Appliances

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Accuracy of different methods of radiographic superimposition on cranial base structures

Cited by 28 publications

References 0 publications

Longitudinal growth changes of the cranial base from puberty to adulthood

Longitudinal growth changes of the cranial base from puberty to adulthood

Comparison of Hand-Traced and Computer-Based Cephalometric Superimpositions

Transferring from functional to fixed appliances

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