David Silveira Alencar

Universidade Federal Fluminense

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Caroline Pelagio Maués Casagrande

Universidade do Estado do Rio de Janeiro

Felipe de Assis Ribeiro Carvalho

Universidade do Estado do Rio de Janeiro

Bruno Dias

Hospital Universitário Pedro Ernesto

Jonas Capelli

Universidade do Estado do Rio de Janeiro

Rhita Cristina Cunha Almeida

Universidade do Estado do Rio de Janeiro

José Augusto M. Miguel

Universidade do Estado do Rio de Janeiro

Taliane Lima BARBOSA

Universidade do Estado do Rio de Janeiro

Andressa Otranto de Britto Teixeira

Universidade do Estado do Rio de Janeiro

Diego Junior da Silva Santos

Universidade do Estado do Rio de Janeiro

Marcus Vinicius Sena Casagrande

Universidade Federal do Rio de Janeiro

Cooperative Institutions

Universidade do Estado do Rio de Janeiro

Universidade Federal do Rio de Janeiro

Universidade Federal Fluminense

Fundação Faculdade de Odontologia

Universidade de São Paulo

Fundação Ataulpho de Paiva

Universidade Federal de Juiz de Fora

Peking University

Government of Uttar Pradesh

Hasselt University

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Planejamento virtual utilizando software de livre acesso

Orthodontic Science and Practice (2021)

Carolina Pelágio Maués Casagrande David Silveira Alencar Diego Junior da Silva Santos José Augusto M. Miguel

The orthodontic setup is a tool used for tridimensional simulation for visual treatment planning. Its analysis allows to plan the mechanics to be used during the orthodontic treatment. For this purpose, it is necessary to duplicate the cast model, to cut the teeth and replace them in their respective cast bases. However, this process demands laboratory time and physical space for cast models storage. The traditional setup with cast models has been substituted by the 3D virtual version once it does not demand physical space for storage. Despite the learning curve, the 3D virtual computerized process has a reduced time when compared to the setup with cast models. But the software high cost is still the main point of disadvantage for its use. Thus, the aim of this study is to describe a step-by-step of 3D virtual orthodontic setup process, by using an open-source software.

3d model

Virtual model

10.24077/2021;1453-1421

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Virtual planning of premaxilla replacement surgery using free software: a method proposal

International Journal of Oral and Maxillofacial Surgery (2019)

Bruno Dias David Silveira Alencar F. Carvalho Renato Yassutaka Faria Yaedú

Premaxilla

Surgical Planning

10.1016/j.ijom.2019.03.023

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Citations (1)

Set-up ortodôntico virtual com visualização das raízes e limites ósseos: proposta de método com softwares gratuitos

David Silveira Alencar

Introduction: Orthodontic treatment simulations through set-up enables the visualization and understanding of benefits and limitations of the treatment plan. Digital models from CT could allow virtual set-up with root visualization, but present low quality coronary images, which could adversely affect the interpretation of dental contacts. Besides that, licensing cost of software used in 3D manipulation can make them less accessible. Objectives: The objective of this study was to develop a methodology to create a virtual set-up that allows evaluation of occlusal changes and visualization of root movements, mainly using free software. Material and Methods: A pretreatment file containing study plaster models and CBCT was selected. One operator used a white-light scanner to scan the models scanned and segmentation was performed on the CBCT using ITK-Snap software, resulting in two digital dental models of different origins and 3D models of the maxilla and mandible, exported to MeshLab. Dental crowns of the plaster models were isolated and, in sequence, aligned and fused with the roots of CBCT, creating a hybrid model for each tooth. Translations and rotations were executed for each teach, using the software’s specific 3D manipulation tool, in order to simulate two treatment options with extraction of four premolars. The jaw models were used as references for root positioning changes. Conclusion: The methodology proposed enabled three-dimensional orthodontic set-ups with high occlusion accuracy, while assessing changes in the root/bone relation.

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Effect of polyvinylsiloxane material and impression handling on the accuracy of digital models

American Journal of Orthodontics and Dentofacial Orthopedics (2016)

Leonardo Tavares Camardella David Silveira Alencar Hero Breuning Oswaldo de Vasconcellos Vilella

Impression

10.1016/j.ajodo.2015.10.027

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Citations (12)

Utilização de programa gratuito para visualização tridimensional de dente impactado a partir de TCFC

Orthodontic Science and Practice (2022)

David Silveira Alencar Caroline Pelágio Maués Casagrande Diego Junior da Silva Santos Jonas Capelli José Augusto M. Miguel

Há pouco tempo, imagens bidimensionais (2D) eram rotineiramente utilizadas para planejamento e diagnóstico ortodônticos. A utilização de tomografias computadorizadas de feixe cônico (TCFC) acrescentou maior nível de detalhamento das imagens e, assim, elevação da qualidade do diagnóstico das más oclusões. O diagnóstico através de imagens tridimensionais (3D) de caninos impactados apresenta vantagens em relação ao diagnóstico e planejamento embasados em imagens 2D de radiografias. É possível gerar modelos virtuais nos três planos do espaço através de imagens adquiridas por TCFC. Em casos de caninos impactados, essas imagens 3D são valiosas para o ortodontista avaliar a posição real do canino impactado e, principalmente avaliar se existe reabsorção de raízes adjacentes causadas pelo canino impactado. Assim, este presente trabalho tem como objetivo demonstrar o passo a passo da utilização de software de livre acesso para a aquisição de imagens tridimensionais, através da utilização de arquivos digitais gerados pelos exames de TCFC.

10.24077/2022;1557csf1902

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Orthodontic-surgical treatment for a patient with Class II malocclusion and inadequate maxillary incisor inclination

American Journal of Orthodontics and Dentofacial Orthopedics (2020)

David Silveira Alencar Rhita Cristina Cunha Almeida Caroline Pelagio Maués Casagrande Roberto Prado Alexandre Hermolin

Overjet

10.1016/j.ajodo.2019.01.030

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Accuracy and reproducibility of dental measurements on tomographic digital models: a systematic review and meta-analysis

Dentomaxillofacial Radiology (2017)

Jamille Barros Ferreira Ilana Oliveira Christovam David Silveira Alencar Andréa Fonseca Jardim da Motta Cláudia Trindade Mattos

Objectives: The aim of this systematic review with meta-analysis was to assess the accuracy and reproducibility of dental measurements obtained from digital study models generated from CBCT compared with those acquired from plaster models. Methods: The electronic databases Cochrane Library, Medline (via PubMed), Scopus, VHL, Web of Science, and System for Information on Grey Literature in Europe were screened to identify articles from 1998 until February 2016. The inclusion criteria were: prospective and retrospective clinical trials in humans; validation and/or comparison articles of dental study models obtained from CBCT and plaster models; and articles that used dental linear measurements as an assessment tool. The methodological quality of the studies was carried out by Quality Assessment of Diagnostic Accuracy Studies-2 (QUADAS-2) tool. A meta-analysis was performed to validate all comparative measurements. Results: The databases search identified a total of 3160 items and 554 duplicates were excluded. After reading titles and abstracts, 12 articles were selected. Five articles were included after reading in full. The methodological quality obtained through QUADAS-2 was poor to moderate. In the meta-analysis, there were statistical differences between the mesiodistal widths of mandibular incisors, maxillary canines and premolars, and overall Bolton analysis. Therefore, the measurements considered accurate were maxillary and mandibular crowding, intermolar width and mesiodistal width of maxillary incisors, mandibular canines and premolars, in both arches for molars. Conclusions: Digital models obtained from CBCT were not accurate for all measures assessed. The differences were clinically acceptable for all dental linear measurements, except for maxillary arch perimeter. Digital models are reproducible for all measurements when intraexaminer assessment is considered and need improvement in interexaminer evaluation.

Dental arch

10.1259/dmfr.20160455

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Citations (37)

Evaluation of two stereophotogrametry software for 3D reconstruction of virtual facial models

Figshare (2022)

Lorena Basilio CHAVES Taliane Lima BARBOSA Caroline Pelagio Maués Casagrande David Silveira Alencar Jonas Capelli

ABSTRACT Objective: The present study aimed to evaluate the accuracy of 3D facial soft tissue virtual models produced by two photogrammetry softwares (AgiSoft Photoscan and 3DF Zephyr Free), when compared to those created by cone beam computed tomography (CBCT). Methods: Ten patients were submitted to two sequences of photographs performed with a DSLR camera (with and without the aid of a ring flash) and CBCT scans. Each photo series for each patient was processed with the softwares, and at the end, five models of each patient were generated: 1) CBCT, 2) AAL (Agisoft Ambient Light), 3) AFL (Agisoft Flash Light), 4) ZAL (Zephyr Ambient Light), and 5) ZFL (Zephyr Flash Light). Color coded maps and root-mean-square (RMS) distances were used to compare the photogrammetry models to the CBCT ones. Results: One sample t-test showed significant differences between all methods versus CBCT. The worst results were seen in the ZAL group (discrepancies up to 5.17mm), while the best results were produced by AAL group (discrepancies up to 2.11mm). Conclusions: It can be concluded that this type of virtual facial models are reasonably accurate, although not perfect, and considering its lower biological and financial cost, they may play an important role in specific situations.

Facial reconstruction

3d model

10.6084/m9.figshare.20226507

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Cartesian three-dimensional method to quantify displacements between cone beam computed tomography models

Dental Press Journal of Orthodontics (2022)

Caroline Pelagio Maués Casagrande Marcus Vinicius Sena Casagrande Andressa Otranto de Britto Teixeira David Silveira Alencar Bruno Dias

ABSTRACT Introduction: Research in Orthodontics and Oral Surgery has been relying on three-dimensional (3D) models to evaluate treatment results with displacement color map techniques, even though it has important limitations. Objectives: This study proposed a method of tracking translational movements of 3D objects to evaluate displacements in surfaces with no shape modification. Methods: Cone Beam Computed Tomography (CBCT) data of ten patients were imported to the Dolphin software. A hypothetical virtual surgical plan (randomly defined) was developed in the software and afterwards verified using the proposed method. All the procedures were carried out by two evaluators, in two different time-points, with a 15-day interval. ITK-Snap software was used to generate high quality STL models. Centroid points were automatically generated and their coordinates were compared to confirm if they represented the known displacements simulated. The paired t-test and the Bland-Altman plots were used, as well as the intraclass correlation coefficient. Results: Interexaminers and intra-examiner tests showed excellent reliability of the method, with mean displacement measurement error values under 0.1mm. The paired t-test did not show any statistically significant differences. Conclusion: The method showed excellent reliability to track the simulated translational displacements of bone segments.

Centroid

Tracking (education)

10.1590/2177-6709.27.5.e222199.oar

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Cartesian three-dimensional method to quantify displacements between cone beam computed tomography models

Figshare (2023)

Caroline Pelagio Maués Casagrande Marcus Vinicius Sena Casagrande Andressa Otranto de Britto Teixeira David Silveira Alencar Bruno Dias

Cone (formal languages)

10.6084/m9.figshare.21835309

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