3D landmarks of Craniofacial Imaging and subsequent considerations on superimpositions in orthodontics—The Aarhus perspective

Cattaneo, Paolo M.; Yung, Augustine K C; Holm, Annemarie; Mashaly, Omar M; Cornelis, Marie A.

doi:10.1111/ocr.12299

Cited by 5 publications

(7 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Landmarks placed on curved structures, such as Gonion, can present greater levels of errors during placement and these errors can differ in the three spatial dimensions 31 . In a 3D evaluation, a higher reliability along the X direction was found for Gonion, whereas this landmark presented poor reliability along the Y and Z directions 32 . In the present study, the landmark placement accuracy was assessed using the root mean square error.…”

Section: Discussionmentioning

confidence: 86%

“…30 Previous studies in 2D and 3D have demonstrated that landmark placement can present different level of errors in the three spatial dimensions (x, y and z). 31,32 Landmarks placed on curved structures, such as Gonion, can present greater levels of errors during placement and these errors can differ in the three spatial dimensions. 31 In a 3D evaluation, a higher reliability along the X direction was found for Gonion, whereas this landmark presented poor reliability along the Y and Z directions.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies in 2D and 3D have demonstrated that landmark placement can present different level of errors in the three spatial dimensions (x, y and z) 31,32 . Landmarks placed on curved structures, such as Gonion, can present greater levels of errors during placement and these errors can differ in the three spatial dimensions 31 .…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Automatic landmark identification in cone‐beam computed tomography

Gillot

Miranda

Baquero

et al. 2023

Orthod Craniofacial Res

View full text Add to dashboard Cite

ObjectiveTo present and validate an open‐source fully automated landmark placement (ALICBCT) tool for cone‐beam computed tomography scans.Materials and MethodsOne hundred and forty‐three large and medium field of view cone‐beam computed tomography (CBCT) were used to train and test a novel approach, called ALICBCT that reformulates landmark detection as a classification problem through a virtual agent placed inside volumetric images. The landmark agents were trained to navigate in a multi‐scale volumetric space to reach the estimated landmark position. The agent movements decision relies on a combination of DenseNet feature network and fully connected layers. For each CBCT, 32 ground truth landmark positions were identified by 2 clinician experts. After validation of the 32 landmarks, new models were trained to identify a total of 119 landmarks that are commonly used in clinical studies for the quantification of changes in bone morphology and tooth position.ResultsOur method achieved a high accuracy with an average of 1.54 ± 0.87 mm error for the 32 landmark positions with rare failures, taking an average of 4.2 second computation time to identify each landmark in one large 3D‐CBCT scan using a conventional GPU.ConclusionThe ALICBCT algorithm is a robust automatic identification tool that has been deployed for clinical and research use as an extension in the 3D Slicer platform allowing continuous updates for increased precision.

show abstract

Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Automatic landmark identification in cone‐beam computed tomography

Gillot

Miranda

Baquero

et al. 2023

Orthod Craniofacial Res

View full text Add to dashboard Cite

show abstract

“…Since variations have been found due to the poor description of the reference points. 17 , 19 , 20 Here, the reference points were described three dimensionally on rigid structures to make their marking easier, modifying the way of locating the sella turcica.…”

Section: Discussionmentioning

confidence: 99%

Concordance and reproducibility in the location of reference points for a volumetric craniofacial analysis: Cross-sectional study

Romero-Tapiero,

Giraldo-Mejía,

Herrera-Rubio

et al. 2023

J Dent Res Dent Clin Dent Prospects

View full text Add to dashboard Cite

Background. Considering the limitations of visualization that occur even with the use of radiographs, the cone beam computed tomography (CBCT) becomes more attractive to diagnose and propose an assertive treatment plan. This study aimed to evaluate intra and interobserver reproducibility, and concordance of 31 reference points we described considering visualization tools and the three planes of space in a bimaxillary CBCT. Methods. Three observers located in triplicate the 31 reference points in the CBCT of six healthy patients. Friedman test was used to compare intraobserver paired samples, and interobserver concordance was determined by the intraclass correlation coefficient (ICC) with ranges>0.75 (excellent), between 0.60 and 0.74 (good), between 0.40 and 0.59 (sufficient) and<0.40 (poor). The P value was set at<0.05. Results. A high ICC (>0.75%) was obtained by comparing the x, y, and z values at the location of landmark points. Excellent ICC>0.75 was for 81.7% and poor<0.40 was 7.5% in the interobserver evaluation. Data showed that 25 points had excellent concordance on the x-plane, 25 on the y-plane, and 26 on the z-plane (0.75%). Conclusion. Intraobserver concordance analysis indicated that location of anatomical reference points on bimaxillary CBCT is performed with great reproducibility by interpreting their location with a clear description in the three planes of space. Complexity of achieving a good precision degree in the manual marking of reference points caused by convexities of the anatomical structures involved, might explain the variability found. The systematized location of the reference points would contribute to reduce such variability.

show abstract

“…This technique permits accurate 3D images with relatively high resolution and minimal distortion, with visualization of the craniofacial structures in a one-to-one ratio along all the three planes of space [ 28 ]. Therefore, it is possible to reliably identify landmarks and to clearly assess, in 3D, the skeletal and dental changes occurring as a result of treatment, without the inherent error of projections typical of lateral cephalograms and the uncertainty in landmarks selection related to the overlapping of bilateral structures [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

A Three-Dimensional Evaluation of Skeletal and Dentoalveolar Changes in Growing Class II Patients after Functional Appliance Therapy: A Retrospective Case-Control Study

Cattaneo,

Holm,

Yung

et al. 2024

JCM

Self Cite

View full text Add to dashboard Cite

Background: The aim was to assess three-dimensionally mandibular and maxillary changes in growing Class II patients treated with removable functional appliances followed by fixed appliances. Methods: Twenty-four Class II patients (age range: 9 to 14, mean: 12.1 ± 1.1 years) treated with removable functional appliances followed by fixed appliances (functional appliance group—FAG) were retrospectively selected and compared to an age-matched control group (CG) treated with fixed appliances only. To be included in the study, pre- and post-treatment CBCT scans had to be available. The CBCTs were used to analyze, in 3D, the changes following treatment and growth. Results: Before treatment, overjet (FAG: 9 mm ± 2.8 (mean ± standard deviation); CG: 4 mm ± 1.7), ANB (FAG: 5.7° ± 2.0; CG: 3.2° ± 1.4), and effective mandibular length (FAG: 113.0 mm ± 4.1; CG: 116.6 mm ± 5.9) were statistically significantly different between the two groups. After treatment, overjet (FAG: −6.8 mm ± 2.8; CG: −1.8 mm ± 1.8) and effective mandibular length (FAG: 6.3 mm ± 2.6; CG: 3.9 mm ± 2.6) statistically significantly changed. There was a significant difference in the treatment effect between the FAG and the CG in overjet, ANB, and effective mandibular length. Conclusions: The results indicate that functional appliances are effective in correcting Class II malocclusions. The growth modification in the FAG resulted in an increase in mandibular length. Yet, the final length of the mandible in the FAG was smaller when compared to the CG.

show abstract

3D landmarks of Craniofacial Imaging and subsequent considerations on superimpositions in orthodontics—The Aarhus perspective

Cited by 5 publications

References 35 publications

Automatic landmark identification in cone‐beam computed tomography

Automatic landmark identification in cone‐beam computed tomography

Concordance and reproducibility in the location of reference points for a volumetric craniofacial analysis: Cross-sectional study

A Three-Dimensional Evaluation of Skeletal and Dentoalveolar Changes in Growing Class II Patients after Functional Appliance Therapy: A Retrospective Case-Control Study

Contact Info

Product

Resources

About