The impact of reorienting cone-beam computed tomographic images in varied head positions on the coordinates of anatomical landmarks

Kim, Jae‐Hun; Jeong, Ho Gul; Hwang, Jae Joon; Lee, Jun Young; Han, Sang-Sun

doi:10.5624/isd.2016.46.2.133

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…[18]. Still, most of the references used also relied on the Porion [18,[44][45][46]. Dos Santos et al varied the FHP setups in 3D and noticed that not only did different orientations result in differences in reliability but also that setups dependent on the Porion points and Orbitales were mostly affected [43].…”

Section: Discussionmentioning

confidence: 99%

Acta Plane—A New Reference for Virtual Orientation of Cone Beam Computed Tomography Scans: A Pilot Study

Sanders-Mello,

de Menezes,

Puetter

et al. 2023

Applied Sciences

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Introduction: Cone Beam Computed Tomography (CBCT) scans should be digitally oriented using a reference plane before being evaluated for patient growth and treatment outcome. Current orientation planes are usually dependent on the Porion points. Using more reliable landmarks than the Porion, we introduce the Acta plane and investigate its reliability as an alternative reference plane for cases in which the Porion point is inaccessible. Methods: To test its reliability, a dental student and an orthodontist located sixteen skeletal and dental landmarks in sixteen CBCT scans before and after reorientation. Also, four measurements were calculated based on these landmarks’ coordinates. The reorientation of these CBCT scans with the Acta plane was performed by another dental student. The Intraclass Correlation Coefficient (ICC) was calculated before and after orientation, as well as the intra and inter-examiner. The data were tested for significance through the Shapiro–Wilk test with a threshold set at 0.05. Through the ICC variation of the points’ coordinates, this article also evaluated the reliability of this plane with the t-paired and exact-sign tests. Results: The identification of landmarks was more reliable in the reoriented CBCT images than in the original images, with a significant increase of 0.012 in the median of the ICC. Linear and angular measures showed no significant differences between groups. Conclusion: This plane is a reliable alternative for the orientation of CBCT images. The design of the Acta plane might allow the use of a smaller field of view and, consequently, a reduction in the radiation dose.

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Section: Discussionmentioning

confidence: 99%

Acta Plane—A New Reference for Virtual Orientation of Cone Beam Computed Tomography Scans: A Pilot Study

Sanders-Mello,

de Menezes,

Puetter

et al. 2023

Applied Sciences

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“…Also, in this study, the radiographic measurements of the 3D images were closer to the physical measurements than the 2D slices and 2D projection images [ 22 ]. Kim et al [ 23 ] used coordinates of the anatomical landmarks on the cadaver and concluded that improper patient's head position might result in measurement errors at 5° tilted and rotated positions. The difference in this study as compared to our study could be explained by using 3D image modality and RayScan Symphony® apparatus CBCT machine as compared to panoramic reconstructed images and NewTom CBCT used in our study.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Mandibular Angulation on Preoperative Assessment of Dental Implant Insertion at Premolar Region: CBCT Study

Mahmoudinezhad

AryanKia

Shooshtari

et al. 2022

BioMed Research International

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Backgrounds. This study investigated the effect of mandibular angulation on the perioperative evaluation of the implant placement at the premolar region on panoramic reconstructed images using cone beam computed tomography (CBCT). Methods. A total of six dried anonymous human mandibles was included. Two implants were inserted in the left and right first premolar region. CBCT scans were obtained from each mandible at the standard position, +20° extension, and -20° flexion. The distance of the implant from the anterior loop of the inferior alveolar nerve and mental foramen was measured. Mean absolute error (MAE) of the distance of the implant from both anatomical landmarks was measured. The Wilcoxon matched-pair signed-rank test was used for the comparison of the measurements. All data were analyzed with the Stata program (version 15.1). Results. No statistically significant differences were found between the distance of the implant from the mental foramen and the anterior loop of the inferior alveolar nerve up to 20° extension and flexion at both sides of the mandible. (All p > 0.1 ) However, a variable range of MAE (SD) in the distance of the implant from different anatomical landmarks was found ( 0.9 ± 0.7 to 3.3 ± 2.1 ). Conclusions. We found no statistical difference in measurements of the distance of the implant from two anatomical landmarks at different head positions up to 20° extension and flexion. However, clinically, variable range in the distance of the implant from anatomical landmarks should be considered. Our findings could alert dentists of the possibility of error up to 20° extension and flexion on the perioperative evaluation of dental implant placement.

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“…While this may be true, it has some disadvantages such as superimposition of structures and low resolution [28]. In recent years, CBCT has become a diagnostic imaging tool in dentistry since it is a three-dimensional imaging modality with lower radiation exposure and with a higher definition, allowing a clearer view of anatomical areas without the superimposition of structures [29,30]. There is a limited number of studies with CBCT regarding cranial base morphology in CLP patients [9,24].…”

Section: Discussionmentioning

confidence: 99%

Timing of Spheno-Occipital Synchondrosis Ossification in Children and Adolescents with Cleft Lip and Palate: A Retrospective Case-Control Study

Vale

Francisco

Lucas

et al. 2020

IJERPH

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Background: Cleft lip and palate (CLP) can affect the development of the maxilla; which may create a midfacial deficiency as well as an interference of the facial growth pattern and dentofacial esthetics. Objective: This study aimed to estimate the chronological age of complete fusion of the spheno-occipital synchondrosis (SOS) in cleft lip and palate patients and a control group; using cone beam computed tomography (CBCT) images. Methods: In this retrospective study; 125 patients were enrolled (cleft lip and palate group (n = 91); control group (n = 34)). Age comparison was made with a chi-square test; and a Kaplan–Meier analysis determined the median time to reach complete fusion of the spheno-occipital synchondrosis (p < 0.05). Results: The experimental group showed statistically significant differences in the median time for complete ossification between males and females (p = 0.019). The median time for complete ossification of the spheno-occipital synchondrosis was; for males; 15.0 years in both groups; for females; it was 14.0 years and 13.0 years in the experimental group and in the control group; respectively. Both for males and females; there were no statistically significant differences between experimental and control groups (p = 0.104). Conclusions: The present study showed no differences in the ossification of the spheno-occipital synchondrosis between individuals with and without cleft lip and/or palate.

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The impact of reorienting cone-beam computed tomographic images in varied head positions on the coordinates of anatomical landmarks

Cited by 7 publications

References 22 publications

Acta Plane—A New Reference for Virtual Orientation of Cone Beam Computed Tomography Scans: A Pilot Study

Acta Plane—A New Reference for Virtual Orientation of Cone Beam Computed Tomography Scans: A Pilot Study

The Effect of Mandibular Angulation on Preoperative Assessment of Dental Implant Insertion at Premolar Region: CBCT Study

Timing of Spheno-Occipital Synchondrosis Ossification in Children and Adolescents with Cleft Lip and Palate: A Retrospective Case-Control Study

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