Validity and reproducibility of cephalometric measurements performed in full and hemifacial reconstructions derived from cone beam computed tomography

Abstract

Objective: To test the reproducibility and validity of angular measurements from virtual lateral cephalometric radiography (LCR) reconstructions (full and hemifacial on both sides) derived from cone beam computed tomography (CBCT). Materials and Methods: Fifty-eight CBCT and LCR images were selected. CBCT volume data were imported into Nemotec software, and virtual LCR images and tomographic slices from CBCT images were assessed. Three observers digitized landmarks used for 12 angular measurements in CBCT images from all patients at two different times. The LCR were evaluated by two examiners, and the mean of the measurements was used as the gold standard. Results: The virtual hemifacial LCR of tomographic slices on the right side showed statistically different higher measures. The same modality on both sides showed less absolute differences for most measures except FMIA and interincisal angles. All modalities had excellent reproducibility. Conclusions: The angular measurements made on virtual LCR reconstructions derived from CBCT are reproducible and valid. Some advantage was found over virtual hemifacial LCR on both sides of the image, mainly in its handling facility. (Angle Orthod. 2012;82:827-832.)

Three-dimensional analysis of craniofacial bones and soft tissues in obstructive sleep apnea using cone beam computed tomography

“…With its simplicity of use and high image quality, CBCT has become increasingly popular in orthodontic clinics [8]. Craniofacial measurements derived from CBCT are reproducible and valid [9,10]. CBCT has been used to evaluate maxillary canine impactions and labio-palatal clefts.…”

“…Grâce à sa facilite d'emploi et à la grande qualite de ses images, le cone beam est de plus en plus utilise par les orthodontistes [8]. Les prises de mesure craniofaciales avec le cone beam sont valides et reproductibles [9,10]. Le cone beam a ete utilise pour evaluer les impactions de canines 3-dimensional analysis of the upper airway while being fast and easy to interpret [11].…”

Deviation of landmarks in accordance with methods of establishing reference planes in three-dimensional facial CT evaluation

“…The Op is one of the most reproducible landmarks in a 3DCT analysis. 15 , 16 , 17 When the Op was used for the MRP, as in M2 and M3, the P deviated by up to 3.80 mm. Meanwhile, when the P was used for the MRP, as in M1, the Op deviated by up to 9.33 mm, which results in considerable facial deviation( Table 4 , Fig.…”

Influence of magnification and superimposition of structures on cephalometric diagnosis

“… 9 Studies have shown that most measurements are reliable in different situations, such as comparison between CBCT-generated and conventional LC, 10,11 and comparison between CBCT-generated hemifacial and full-face LC to conventional LC. 12 In addition, with CBCT, it is possible to generate a LC of different structures of the head. With the tools that have been made available by computer software, it is possible to eliminate one of the drawbacks of traditional 2D cephalograms (head orientation) and understand how "errors of projection" can influence "errors of identification".…”