Comparison of linear and angular changes assessed in digital dental models and cone‐beam computed tomography

Massaro, Camila; Losada, C Gonzalez; Cevidanes, Lucia; Yatabe, Marília; Garib, Daniela Gamba; Lauris, José Roberto Pereira; Ioshida, Marcos; Rey, Diego; Álvarez, María Antonia; Benavides, Erika; Ríos, Héctor F.; Aristizabal, Juan Fernando; Ruellas, Antônio Carlos de Oliveira

doi:10.1111/ocr.12352

Cited by 6 publications

(17 citation statements)

References 39 publications

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“…The Bland‐Altman plots for inter‐ and intra‐rater reliability testing had biases that were close to zero (Figure 3), with most points within upper and lower limits of agreement of 5 degrees, demonstrating that the mesiodistal angulation and buccolingual inclination measurements by the two operators were reproducible between and within them. Intra‐rater reliability (ICC range: 0.72‐0.98) and inter‐rater reliability (ICC range: 0.67‐0.88) were consistent with other studies 4,17 . For all tooth and movement types investigated, no significant differences were observed between measurements obtained from DDMs and CBCTs (Table 1).…”

Section: Discussionsupporting

confidence: 87%

“…The image processing procedures followed previously published methods, 4,22‐24 using 2 open‐source software (ITK‐SNAP, 25 version 2.4.0, http://www.itksnap.org, and 3D SlicerCMF, 26 version 4.0) for construction of 3D volumetric label maps, orientation of mandibular surface models, manual approximation, voxel‐based registration of CBCTs and landmark‐based registration of the DDMs to the registered CBCTs.…”

Section: Methodsmentioning

confidence: 99%

“…Proper placement of the entire tooth is crucial to treatment planning tooth movement, monitoring and maintaining periodontal health, 1 attaining stable treatment outcomes and occlusal function, 2 and satisfying Andrews’ six keys to normal occlusion 3 . An understanding of angular changes in tooth long axes due to orthodontic treatment and/or ageing yields clinical insights to the three‐dimensional positioning of the whole tooth 4 . In 1972, Dr Larry Andrews pioneered the assessment of dental long axes angulation using the clinical crown in dental casts 3,5 .…”

Section: Introductionmentioning

confidence: 99%

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Dental long axes using digital dental models compared to cone‐beam computed tomography

Cong

Massaro

Ruellas

et al. 2021

Orthod Craniofacial Res

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Objective Standard methods of evaluating tooth long axes are not comparable (digital dental models [DDMs], panoramic and cephalometric radiographs) or expose patients to more radiation (cone‐beam computed tomography [CBCT]). This study aimed to compare angular changes in tooth long axes using DDMs vs using CBCTs. Settings and sample population Secondary data analysis of DDMs and CBCTs, taken before and after orthodontic treatment with piezocision of 24 patients. Methods Angular changes in tooth long axes were evaluated using landmarks on first molars (centre of the occlusal surface and centre of the furcation), canines and incisors (cusp tip and centre of the root at the cementoenamel junction). Wilcoxon test, intraclass correlation coefficient (ICC) and Bland‐Altman plots were used to test intra‐ and inter‐rater agreement and compare DDM and CBCT measurements. Results The mesiodistal angulation and buccolingual inclination DDM measurements were reproducible. Overall mean differences between DDM and CBCT measurements of mesiodistal angulation, 1.9°±1.5°, and buccolingual inclination, 2.2 ± 2.2°, were not significant for all teeth. ICC between DDM and CBCT measurements ranged from good (0.85 molars) to excellent (0.94 canines; 0.96 incisors). The percentages of measurements outside the range of ±5 were 17.4% for molars, 13.8% for canines and 4.5% for incisors. Conclusions DDM assessment of changes in tooth long axes has good reproducibility and yields comparable measurements to those obtained from CBCT within a 5° range. These findings lay the groundwork for machine learning approaches that synthesize crown and root canal information towards planning tooth movement without the need for ionizing radiation scans.

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Section: Discussionsupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dental long axes using digital dental models compared to cone‐beam computed tomography

Cong

Massaro

Ruellas

et al. 2021

Orthod Craniofacial Res

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“…For example, scanning existing models, which large clinics might possess in great numbers, could be a slow and tedious process. 20 New and fast scanning tools and software introduced to the market should continue to be investigated to determine their clinical accuracy and reliability. 14 …”

Section: Discussionmentioning

confidence: 99%

Assessment of the accuracy of laser-scanned models and 3-dimensional rendered cone-beam computed tomographic images compared to digital caliper measurements on plaster casts

et al. 2021

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Purpose This study investigated the accuracy of laser-scanned models and 3-dimensional (3D) rendered cone-beam computed tomography (CBCT) compared to the gold standard (plaster casts) for linear measurements on dental arches. Materials and Methods CBCT scans and plaster models from 30 patients were retrieved. Plaster models were scanned by an Emerald laser scanner (Planmeca, Helsinki, Finland). Sixteen different measurements, encompassing the mesiodistal width of teeth and both arches’ length and width, were calculated using various landmarks. Linear measurements were made on laser-scanned models using Autodesk Meshmixer software v. 3.0 (Autodesk, Mill Valley, CA, USA), on 3D-rendered CBCT models using OnDemand 3D v. 1.0 (Cybermed, Seoul, Korea) and on plaster casts by a digital caliper. Descriptive statistics, the paired t-test, and intra- and inter-class correlation coefficients were used to analyze the data. Results There were statistically significant differences between some measurements on plaster casts and laser-scanned or 3D-rendered CBCT models ( P <0.05). Molar mesiodistal width and mandibular anterior arch width deviated significantly different from the gold standard in both methods. The largest mean differences of laser-scanned and 3D-rendered CBCT models compared to the gold standard were 0.12±0.23 mm and 0.42±0.53 mm, respectively. Most of the mean differences were not clinically significant. The intra- and inter-class correlation results were acceptable for all measurements (>0.830) and between observers (>0.801). Conclusion The 3D-rendered CBCT images and laser-scanned models were useful and accurate alternatives to conventional plaster models. They could be used for clinical purposes in orthodontics and prostheses.

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“…Transversal measurements of the maxilla showed a distance of 21.86 mm between primary canines and 29.04 mm between primary second molars. According to the study of McNamara and coauthors [4,24], a clinical value of inter-molar distances  31 mm should be considered as a cut-off parameter for diagnosis of narrowed maxillary requiring treatment by maxillary expansion. However, considering that the patient was only 6 years old and that she presented full primary dentition, this cut-off could be higher considering the potential growth of the patient [24].…”

Section: Diagnosis and Treatment Planmentioning

confidence: 99%

New Technologies in Orthodontics: A Digital Workflow to Enhance Treatment Plan and Photobiomodulation to Expedite Clinical Outcomes

et al. 2020

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Background: The transversal maxillary deficiency represents one of the most frequent skeletal discrepancies of the craniofacial region. The analysis of morphological characteristics of the maxilla can be detrimental for a correct diagnosis and treatment plan. Methods: This paper shows a user-friendly digital workflow involving mirroring, superimposition, and the deviation analysis of 3D models of the maxilla in order to identify the presence of symmetry/asymmetry of the palatal vault. Such information can be helpful to clinicians in order to design an appropriate orthodontic appliance for the treatment of transversal maxillary deficiency. We also describe a case report of a seven-year-old female affected by mild transversal maxillary deficiency associated with anterior openbite. The appliance is designed after a comprehensive evaluation of the morphology of the maxilla performed by using the presented diagnostic digital workflow. Additionally, the orthodontic treatment is assisted by photobiomodulation sessions that expedite the achievement of clinical outcomes.

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Comparison of linear and angular changes assessed in digital dental models and cone‐beam computed tomography

Cited by 6 publications

References 39 publications

Dental long axes using digital dental models compared to cone‐beam computed tomography

Dental long axes using digital dental models compared to cone‐beam computed tomography

Assessment of the accuracy of laser-scanned models and 3-dimensional rendered cone-beam computed tomographic images compared to digital caliper measurements on plaster casts

New Technologies in Orthodontics: A Digital Workflow to Enhance Treatment Plan and Photobiomodulation to Expedite Clinical Outcomes

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