Accuracy of linear and angular measurements on panoramic radiographs taken at various positions in vitro

Steve Stramotas, Joseph P. Geenty, Peter Petocz, M. Ali Darendeliler*

*Corresponding author for this work

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

The accuracy of measurement of tooth length and angulation on dental panoramic tomograms (DPTs) is thought to be highly dependent on head positioning technique. A model representing the dentition and the functional occlusal plane was designed using an acrylic framework and stainless steel wires. The aim was to investigate whether varying the position of the model affects the linear and angular measurements on DPTs. Four different positions were investigated: initial position representing natural head posture (NHP) (T1); lateral right cant of the occlusal plane (T2); lateral left cant of the occlusal plane (T3); and tilting the occlusal plane up anteriorly (T4). On each DPT, four sets of measurements were recorded: (1) Vertical linear measurements of the stainless steel pins and ratio calculations of the 'crown' and 'root' segments (represented by the wire above and below the occlusal plane, respectively); (2) angular measurements of the pins elative to the occlusal plane; (3) angular measurements of the pins relative to a constructed reference line; and (4) angular measurements of pins relative to each other in the same segment. The results showed a significant error (P < 0.05) in all measurements when the occlusal plane was tilted up anteriorly by 8 degrees. A lateral cant of the occlusal plane by less than 10 degrees without an upward anterior rotation showed no significant effect on the measurements. This would suggest that there is some tolerance of variation in head position.

Original languageEnglish
Pages (from-to)43-52
Number of pages10
JournalEuropean Journal of Orthodontics
Volume24
Issue number1
DOIs
Publication statusPublished - 2002
Externally publishedYes

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