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1.
Braz. j. oral sci ; 21: e225924, jan.-dez. 2022. ilus
Article in English | LILACS, BBO | ID: biblio-1355003

ABSTRACT

Aim: To assess the reliability and validity of morphometric features on 3D digital models produced by scanning maxillary dental casts of Malaysian Malay subjects. Methods: Dental casts of 20 subjects were scanned using a 3D laser scanner (Next Engine Inc., Santa Monica, California, USA). The palatal rugae morphometric features were assessed on the resulting 3D models using 3-Matic Research 9.0 software (Materialise NV, Heverlee, Belgium). The assessments were repeated by the first and second authors to assess the intra- and interexaminer reliability, respectively. Rugae morphometric features were also evaluated on the conventional plaster models to assess the validity of the 3D method. Results: Kappa values of the validity ranged from 0.807 to 0.922 for rugae shape, size category and direction. The intraclass correlation coefficient (ICC) for rugae number validity was 0.979. For intra-examiner reliability, kappa values ranged from 0.716-1.000 for rugae shape, size category and direction. The ICC for rugae number intra-examiner reliability was 0.949. Kappa values of interexaminer reliability for rugae shape, size category and direction were 0.723-885, while the ICC of rugae number was 0.896. Conclusion: Palatal rugae analyses on 3D digital models scanned by the 3D Next Engine laser scanner using 3-Matic Research 9.0 software are valid and reliable


Subject(s)
Palate , Forensic Anthropology , Imaging, Three-Dimensional , Forensic Dentistry
2.
Braz. j. oral sci ; 21: e227903, jan.-dez. 2022. ilus
Article in English | LILACS, BBO | ID: biblio-1355005

ABSTRACT

Aim: To evaluate the accuracy and the validity of orthodontic diagnostic measurements, as well as virtual tooth transformations using a generic open access 3D software compared to OrthoAnalyzer (3Shape) software; which was previously tested and proven for accuracy. Methods: 40 maxillary and mandibular single arch study models were duplicated and scanned using 3Shape laser scanner. The files were imported into the generic and OrthoAnalyzer software programs; where linear measurements were taken twice to investigate the accuracy of the program. To test the accuracy of the program format, they were printed, rescanned and imported into OrthAnalyzer. Finally, to investigate the accuracy of editing capabilities, linear and angular transformation procedures were performed, superimposed and printed to be rescanned and imported to OrthoAnalyzer for comparison. Results: There was no statistically significant difference between the two groups using the two software programs regarding the accuracy of the linear measurements (p>0.05). There was no statistically significant difference between the different formats among all the measurements, (p>0.05). The editing capabilities also showed no statistically significant difference (p>0.05). Conclusion: The generic 3D software (Meshmixer) was valid and accurate in cast measurements and linear and angular editing procedures. It can be used for orthodontic diagnosis and treatment planning without added costs


Subject(s)
Software , Casts, Surgical , Imaging, Three-Dimensional , Models, Dental
3.
Int. j. morphol ; 40(3): 683-687, jun. 2022. ilus
Article in English | LILACS-Express | LILACS | ID: biblio-1385682

ABSTRACT

SUMMARY: From 1984 stereology was added to unbiased methods and procedures, i.e., counts became more reliable studying morphological images in a random and uniform isotropic way. Therefore, the orientation and sectioning methods adapted to stereological quantification are essential. A critical quantitative subject in practical pathology concerns diagnosing and classifying neoplasias. Pathologists evaluated different types of tumors by determining the nuclear roundness factor (NRF). NRF is calculated by the ratio between the nuclear radius obtained from the area and the perimeter. However, NRF is biased data because it depends on the sectioning orientation, nuclei shape, and section thickness. The stereology proposed an unbiased alternative to assess the nucleus from tumor cells, counteracting NRF quantitatively. Therefore, the volume-weighted mean nuclear volume has been used to prognostic tumors in several organs. In urology, this was used, for example, to study primary carcinoma of the bladder, renal and prostatic carcinomas.


RESUMEN: A partir de 1984 se agregó la estereología a los métodos y procedimientos sin distorción, es decir, los conteos se volvieron más confiables al estudiar imágenes morfológicas de forma aleatoria e isotrópica uniforme. Por tanto, los métodos de orientación y seccionamiento adaptados a la cuantificación estereológica son fundamentales. Un tema cuantitativo crítico en la patología práctica se refiere al diagnóstico y clasificación de las neoplasias. Los patólogos evaluaron diferentes tipos de tumores determinando el factor de redondez nuclear (NRF). NRF se calcula por la relación entre el radio nuclear obtenido del área y el perímetro. Sin embargo, NRF son datos distorsionados debido a que dependen de la orientación de la sección, la forma de los núcleos y el grosor de la sección. La estereología propuso una alternativa imparcial para evaluar el núcleo de las células tumorales, contrarrestando cuantitativamente el NRF. Por lo tanto, el volumen nuclear medio ponderado se ha utilizado para pronosticar tumores en varios órganos. En urología, esto se utilizó, por ejemplo, para estudiar el carcinoma primario de vejiga, carcinomas renales y prostáticos.


Subject(s)
Humans , Cell Nucleus/pathology , Imaging, Three-Dimensional , Neoplasms/pathology
4.
J. oral res. (Impresa) ; S1: 1-7, abr. 30, 2022. ilus
Article in English | LILACS | ID: biblio-1398325

ABSTRACT

Objective: To recognize the usefulness of incorporating Three-Dimensional models of standardized humans in electronic health records, in the context of the development of a teledentistry web platform designed for the attention of the elderly population in COVID-19 pandemic context. Material and Methods: A teledentistry web platform designed with different modules for clinical records. Through a new user-computer interface with a standardized virtual 3D phantom, an extraoral physical examination, an intraoral examination section was modeled. A label-associated marker is allowed to record descriptive aspects of the findings. A 3D odontogram represents multiple patient's conditions for each of the 32 dental positions. Results: From a total of 135 patients registered on the platform, 51 markers and 33 photographs associated with the surface of the virtual 3D phantoms were recorded. For the Location parameter: Hard palate 27.6%, inserted gingiva 15.7%, tongue 15.6%. For the Type of lesion parameter (according to the information entered in the pathology selector): unidentified 35.3%, sub-prosthetic stomatitis 23.5%, irritative fibroma 9.8%. Through the registration of the exact location of the finding in the virtual phantom by a 3D marker, the 3D modeling of the oral pathologies contributed to a better diagnosis, improving the remote communication between the attending dentist and specialists. Conclusion: The combination of the 3D modeling and anatomical-referencing in a teledentistry platform can become a powerful tool for the dental practice, due to their utility and specificity.


Objetivo: Reconocer la utilidad de incorporar modelos tridimensionales de humanos estandarizados en registros electrónicos de salud, en el contexto del desarrollo de una plataforma web de teleodontología diseñada para la atención de la población adulta mayor en contexto de pandemia por COVID-19. Material y Métodos: Una plataforma web de teleodontología diseñada con diferentes módulos para historias clínicas. A través de una nueva interfaz usuario-computadora con un fantoma 3D virtual estandarizado, se modeló un examen físico extraoral, una sección de examen intraoral. Se permite un marcador asociado a la etiqueta para registrar aspectos descriptivos de los hallazgos. Un odontograma 3D representa múltiples condiciones del paciente para cada una de las 32 posiciones dentales.Resultados: De un total de 135 pacientes registrados en la plataforma, se registraron 51 marcadores y 33 fotografías asociadas a la superficie de los fantomas virtuales 3D. Para el parámetro Ubicación: Paladar duro 27,6%, encía insertada 15,7%, lengua 15,6%. Para el parámetro Tipo de lesión (según la información ingresada en el selector de patología): no identificado 35,3%, estomatitis subprotésica 23,5%, fibroma irritativo 9,8%. A través del registro de la ubicación exacta del hallazgo en el fantoma virtual mediante un marcador 3D, el modelado 3D de las patologías orales contribuyó a un mejor diagnóstico, mejorando la comunicación remota entre el odontólogo tratante y los especialistas. Conclusión: La combinación del modelado 3D y la referenciación anatómica en una plataforma de teleodontología puede convertirse en una poderosa herramienta para la práctica odontológica, debido a su utilidad y especificidad.


Subject(s)
Humans , Telemedicine/methods , Imaging, Three-Dimensional/instrumentation , Pandemics , Teledentistry , COVID-19 , Phantoms, Imaging , Electronic Health Records
5.
J. oral res. (Impresa) ; S1: 1-8, abr. 30, 2022. ilus
Article in English | LILACS | ID: biblio-1398528

ABSTRACT

Objective: To contribute to early diagnosis of lesions in older patients, including potentially malignant lesions or those suspected of oral cancer by support of a web-based teledentistry platform. Material and Methods:This report contains information from 27 patients with oral lesions out of a total of 135 who received mobile dental care. Specialists who participated in the study involved professionals from the disciplines of periodontics, temporomandibular disorders, oral implantology, oral radiology, oral pathology and geriatrics. Referral consultations were carried out synchronously or asynchronously. Clinical information sent to oral pathology specialists involved a medical history and a traditional description of the lesion which considered size, color, limits, symptomatology, type of surface, consistency, location, and evolution. This information was complemented with a three-dimensional representation of the lesion, simulating an extra/intra oral clinical examination including a marker tool that allows to perform the anatomical-referencing of oral lesions. Results:27 consultations from 26 patients were evaluated for oral pathology lesions. 12 lesions were diagnosed as reactive, 5 were infectious lesions, 4 of vascular etiology, 3 pigmented lesions (amalgam tattoo and smoking-related melanosis) and 3 potentially malignant lesions. The most frequent location was the tongue with 8 cases, followed by the gingiva and jugal mucosa, each with 5 cases. Four lesions required biopsy and histopathological report. Conclusion: A teledentistry platform including digital representations of oral lesions using different digital markers, also associated with a mobile system to provide dental care, constitutes an excellent tool to treat patients that present oral lesions with potential cancer risk.


Objetivo: Contribuir al diagnóstico precoz de lesiones en pacientes mayores, incluyendo lesiones potencialmente malignas o con sospecha de cáncer oral mediante el apoyo de una plataforma de teleodontología basada en la web.Material y Métodos: Este informe contiene información de 27 pacientes con lesiones orales de un total de 135 que recibieron atención odontológica móvil. Los especialistas que participaron en el estudio incluyeron profesionales de las disciplinas de periodoncia, trastornos temporomandibulares, implantología oral, radiología oral, patología oral y geriatría. Las interconsultas se realizaron de forma sincrónica o asincrónica. La información clínica enviada a los especialistas en patología oral involucró una historia clínica y una descripción tradicional de la lesión que consideró tamaño, color, límites, sintomatología, tipo de superficie, consistencia, localización y evolución. Esta información se complementó con una representación tridimensional de la lesión, simu-lando un examen clínico extra/intraoral incluyendo una herramienta marcadora que permite realizar la referenciación anatómica de las lesiones orales. Resultados: Se evaluaron 27 consultas de 26 pacientes por lesiones de patología bucal. Se diagnosticaron 12 lesiones como reactivas, 5 lesiones infecciosas, 4 de etiología vascular, 3 lesiones pigmentadas (tatuaje de amalgama y melanosis por tabaquismo) y 3 lesiones potencialmente malignas. La localización más frecuente fue lengua con 8 casos, seguida de encía y mucosa yugal con 5 casos cada una. Cuatro lesiones requirieron biopsia e informe histopatológico. Conclusión: Una plataforma de teleodontología que incluye representaciones digitales de lesiones orales utilizando diferentes marcadores digitales, también asociada a un sistema móvil para brindar atención odontológica, constituye una excelente herramienta para tratar pacientes que presentan lesiones orales con riesgo potencial de cáncer.


Subject(s)
Humans , Male , Female , Mouth Neoplasms/diagnosis , Dental Care/methods , Teledentistry , Periodontics , Imaging, Three-Dimensional , Geriatric Dentistry/methods
6.
Rev. Bras. Saúde Mater. Infant. (Online) ; 22(1): 147-155, Jan.-Mar. 2022. tab, graf
Article in English | LILACS | ID: biblio-1376210

ABSTRACT

Abstract Objectives: to verify the agreement among adolescents' perception of their own body image and the health professionals' analysis based on three-dimensional body image and the inter-rater agreement. Methods: a cross-sectional study was carried out with 1,662 adolescents, aged 18 to 19 years old, from the 1997/98 birth cohort in São Luís, Maranhão. Self-perception of body image was assessed using the Stunkard's body image scale. Three nutritionists evaluated the three-dimensional body image obtained by the Photonic Scanner (3D Body Scanner) and classified according to the Stunkard's scale. The agreement between raters was verified by using weighted Kappa. Results: the analysis of agreement between raters in the general group and when stratified by sexwas considered moderate to good by Kappa. Regarding the intraclass correlation (ICC), good and excellent correlation values were observed both in the general group, males and females. There was a greater perception of overweight by all raters, when compared with the adolescents' self-assessments. When stratified by sex, examiner 1 had the same perception as male self-assessments, as for females the perception of overweight was more frequent, as well as raters 2 and 3, for both sexes. Conclusion: agreement between raters and self-assessments was considered weak/moderate in Kappa and good/excellent in ICC.


Resumo Objetivos: verificar a concordância da autopercepção da imagem corporal de adolescentes com a análise de profissionais da saúde a partir de imagem corporal tridimensional e a concordância inter-avaliadores. Métodos: estudo transversal, com 1662 adolescentes, de 18-19 anos, da coorte de nascimento de 1997/98 de São Luís, Maranhão. A autopercepção da imagem corporal foi avaliada pela escala de imagem corporal de Stunkard. Três nutricionistas avaliaram a imagem corporal tridimensional e classificaram conforme Stunkard. A concordância foi verificada utilizando Kappa ponderado. Resultados: a análise de concordância entre os avaliadores no grupo geral e quando estratificada por sexo foi considerada moderada a boa pelo Kappa. Em relação a correlação intraclasse (ICC), observou-se valores de correlação bons e excelentes tanto no grupo geral, quanto no sexo masculino e no feminino. Notou-se maior percepção de excesso de peso por todos os avaliadores, quando comparado às autoavaliações dos adolescentes. Quando estratificado por sexo, o avaliador 1 teve a mesma percepção que as autoavaliações do sexo masculino, enquanto para o sexo feminino a percepção de excesso de peso foi mais frequente, assim como os avaliadores 2 e 3, para ambos os sexos. Conclusão: a concordância entre avaliadores e as autoavaliações foram consideradas fracas/moderadas no Kappa e bons/excelente pela ICC.


Subject(s)
Humans , Male , Female , Adolescent , Adult , Self Concept , Body Image , Health Personnel , Imaging, Three-Dimensional , Overweight , Body Dissatisfaction , Brazil , Cross-Sectional Studies
7.
Rev. ADM ; 79(1): 12-19, ene.-feb. 2022. ilus, graf
Article in Spanish | LILACS | ID: biblio-1361307

ABSTRACT

El objetivo del presente estudio fue medir la curvatura vestíbulo-lingual de los conductos de las raíces mesiales de primeros molares inferiores en personas adultas del estado de Chihuahua, por medio de la técnica de tomografía computarizada de haz cónico (CBCT, por sus siglas en inglés) y usando el software de análisis 3D EndoTM (Dentsply/Sirona USA). Se llevó a cabo la medición por dos observadoras, empleando dos métodos diferentes, Schneider y 3D EndoTM (Dentsply/Sirona USA). Los resultados obtenidos tuvieron valores mayores a los 100 grados con la técnica 3D EndoTM y a los 20 grados con la técnica de Schneider. No se detectó una diferencia estadística significativa al comparar los diferentes conductos entre sí (AU)


The objective of the present study was to measure the vestibule-lingual curvature of the ducts of the mesial roots of lower first molars, of adults from the state of Chihuahua. Using the cone beam computed tomography (CBCT) technique and using the 3D analysis software EndoTM (Dentsply/Sirona USA). The measurement was carried out by two observers using two different methods, Schneider and 3D EndoTM (Dentsply/Sirona USA). The results obtained had values greater than 100 degrees with the 3D EndoTM technique and at 20 degrees with the Schneider technique. No statistically significant difference was detected when comparing the different ducts with each other (AU)


Subject(s)
Humans , Dental Pulp Cavity , Cone-Beam Computed Tomography , Molar , Software , Data Interpretation, Statistical , Imaging, Three-Dimensional , Mexico
8.
Rev. cir. (Impr.) ; 74(1): 112-119, feb. 2022. ilus
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1388911

ABSTRACT

Resumen El trasplante hepático con donante vivo (THDV) es un procedimiento complejo y desafiante para el cirujano, ya que exige garantizar tanto la máxima seguridad para el donante, así como también, la mejor calidad del injerto para el receptor. Debido a lo anterior, la implementación de la cirugía mini-invasiva ha sido lenta en esta área. Sin embargo, en los últimos 10 años, gracias a los avances que ha experimentado la cirugía hepática laparoscópica, ha aumentado el interés de algunos grupos altamente especializados por incorporar la cirugía mini-invasiva a la cirugía del donante, principalmente en trasplante hepático donante vivo adulto-pediátrico (THDVA-P). Los favorables resultados obtenidos en esta área incluso han llevado a los expertos en el tema, a categorizar el abordaje laparoscópico para la cirugía del donante como el procedimiento estándar en THDVA-P. Contrario a lo anterior, la implementación de la laparoscopía para trasplante hepático donante vivo adulto-adulto (THDVA-A), es más compleja y requiere en su mayoría, una hepatectomía de lóbulo derecho o izquierdo para cumplir con las necesidades volumétricas del receptor. Esta cirugía es de mayor dificultad y riesgo para el donante, por lo que su indicación por vía mini-invasiva está limitada a centros de alto volumen y preparación, tanto en laparoscopía, como en trasplante hepático. En este trabajo, se busca dar a conocer la técnica quirúrgica y nuestra experiencia inicial con la primera hepatectomía derecha totalmente laparoscópica (HDTL) para THDVA-A realizada en Chile.


Living donor liver transplantation is a complex and challenging procedure. The surgeon needs to guarantee maximum safety for the donor, as well as the best quality of the graft for the recipient. For this reason, the implementation of mini-invasive surgery has been slow in this area. However, in the last 10 years, due to the advances in laparoscopic liver surgery, the interest of some highly specialized groups has increased in incorporating mini-invasive surgery into donor surgery, mainly in pediatric living donor liver transplantation. The favorable results obtained in this field, have even led to turn this procedure, into the technique of choice for pediatric living donor liver transplantation. Nevertheless, this procedure is even more challenging for adult-to-adult living donor transplantation. To meet the volumetric criteria of an adult, a complete hepatectomy of right or left lobe is mostly required. This surgery is of greater complexity and risk for the donor, so its indication by minimally invasive approach is limited to high-volume centers with preparation, both in laparoscopy and liver transplants. In this report we seek to present our surgical technique and initial experience with the first pure laparoscopic right hepatectomy for adult-to-adult living donor liver transplantation carried out in Chile.


Subject(s)
Humans , Female , Adult , Laparoscopy , Living Donors , Liver Neoplasms/surgery , Tomography, X-Ray Computed/methods , Chile , Liver Transplantation/methods , Imaging, Three-Dimensional , Abdomen/diagnostic imaging , Hepatectomy
9.
Rev. bras. oftalmol ; 81: e0042, 2022. graf
Article in English | LILACS | ID: biblio-1387970

ABSTRACT

ABSTRACT Introduction: The use of tridimensional (3D) printing in healthcare has contributed to the development of instruments and implants. The 3D printing has also been used for teaching future professionals. In order to have a good 3D printed piece, it is necessary to have high quality images, such as the ones from Computerized Tomography (CT scan) exam, which shows the anatomy from different cuts and allows for a good image reconstruction. Purpose: To propose a protocol for creating digital files from computerized tomography images to be printed in 3D and used as didactic material in the ophthalmology field, using open-source software, InVesalius®, Blender® and Repetier-Host©. Methods: Two orbit CT scan exam images in the DICOM format were used to create the virtual file to be printed in 3D. To edit the images, the software InVesalius® (Version 3.1.1) was used to delimit and clean the structure of interest, and also to convert to STL format. The software Blender® (Version 2.80) was used to refine the image. The STL image was then sent to the Repetier-Host© (Version 2.1.3) software, which splits the image in layers and generates the instructions to print the piece in the 3D printer using the polymer polylactic acid (PLA). Results: The printed anatomical pieces printed reproduced most structures, both bone and soft structures, satisfactorily. However, there were some problems during printing, such as the loss of small bone structures, that are naturally surrounded by muscles due to the lack of support. Conclusion: Despite the difficulties faced during the production of the pieces, it was also possible to reproduce the anatomical structures adequately, which indicates that this protocol of 3D printing from medical images is viable.


RESUMO Introdução: O uso de impressão em 3-D na área da saúde tem contribuído para o desenvolvimento de instrumentos e próteses. A impressão 3-D tem sido usada para o ensino de futuros profissionais. Para se alcançar uma boa peça em 3-D, é necessário ter imagens de alta qualidade, como aquelas geradas pelo exame de Tomografia Computadorizada (TC), que mostra a anatomia sob diferentes cortes e permite uma boa reconstrução de imagem. Objetivo: Propor um protocolo para a criação de arquivos digitais a partir de imagens de tomografia computadorizada a serem impressas em 3-D e usadas como modelo de material didático oftalmológico usando software de código aberto, InVesalius®, Bender® e Repetier-Host©. Métodos: Foram utilizadas imagens em formato DICOM provenientes de dois exames de tomografia computadorizada de órbitas para a impressão tridimensional. Para manuseio das imagens, foram utilizados o InVesalius®, versão 3.1.1, para delimitar e limpar a estrutura de interesse e também para converter em formato STL. O Blender®, versão 2.80 foi usado para refinamento. A imagem em STL foi então enviada para o programa Repetier-Host, versão 2.1.3, que divide a imagem em camadas e gera as instruções para impressão da peça em ácido polilático na impressora tridimensional. Resultados: As peças anatômicas impressas reproduziram de forma satisfatória a maioria das estruturas ósseas e musculares. No entanto, houve dificuldade durante a impressão das estruturas ósseas menores, como perda de estrutura óssea pequena, que não possuíam sustentação, por serem envoltas pelo músculo. Conclusão: Apesar das dificuldades encontradas na produção dessas peças de estudo, foi possível reproduzir estruturas com fidelidade, indicando que o protocolo proposto viabiliza a impressão de imagens oriundas da tomografia computadorizada para impressão tridimensional.


Subject(s)
Humans , Ophthalmology/education , Orbit/anatomy & histology , Orbit/diagnostic imaging , Tomography, X-Ray Computed/methods , Imaging, Three-Dimensional/instrumentation , Printing, Three-Dimensional/instrumentation , Students, Medical , Teaching , Software , Education, Medical/methods , Anatomy/education , Models, Anatomic
10.
Rev. bras. oftalmol ; 81: e0052, 2022.
Article in Portuguese | LILACS | ID: biblio-1387965

ABSTRACT

RESUMO A manufatura aditiva, mais popularmente conhecida como impressão tridimensional, baseia-se no desenvolvimento de um objeto com a ajuda de um software de desenho assistido por computador seguido de sua impressão por meio da deposição de uma matéria-prima, camada por camada, para a construção do produto desejado. Existem vários tipos de técnicas de impressão tridimensional, e o tipo de processo de impressão escolhido depende da aplicação específica do objeto a ser desenvolvido, dos materiais a serem utilizados e da resolução necessária à impressão do produto final. A impressão tridimensional abriu perspectivas na pesquisa e revolucionou o campo das ciências da saúde, com a possibilidade de criação e de desenvolvimento de produtos personalizados de maneira rápida, econômica e de forma mais centralizada do que no processo de manufatura tradicional. As tecnologias de manufatura aditiva remodelaram os diagnósticos médicos; as medidas preventivas e pré-operatórias; o tratamento e a reabilitação, assim como os processos de engenharia de tecidos nos últimos anos. Na oftalmologia, as aplicações da impressão tridimensional são extensas. Modelos anatômicos para aplicação na área da educação e planejamentos cirúrgicos, desenvolvimento de implantes, lentes, equipamentos para diagnósticos, novas aplicações terapêuticas e desenvolvimento de tecidos oculares já estão em desenvolvimento. Por possuir um campo amplo e ser alvo de pesquisa constante, a área oftalmológica permite que a manufatura aditiva ainda seja amplamente utilizada a favor dos médicos e dos pacientes.


ABSTRACT Additive manufacturing, more popularly known as three-dimensional (3D) printing, is based on the development of an object with the help of computer-aided design software followed by its printing through the deposition of a material, layer by layer, to create the desired product. There are several types of 3D printing techniques and the type of printing process chosen depends on the specific application of the object to be developed, the materials to be used, and the resolution required to print the final product. 3D printing has brought new perspectives to research and revolutionized the field of health sciences, with the possibility of creating and developing customized products in a faster, more economical, and more centralized way than in the traditional manufacturing process. Additive manufacturing technologies have reformulated medical diagnostics, preventive, preoperative, treatment, and rehabilitation, as well as tissue engineering processes in recent years. In ophthalmology, the applications of 3D printing are extensive. Anatomical models for application in education and surgical planning, development of implants, lenses, diagnostic equipment, new therapeutic applications, and development of ocular tissues (3D bioprinting) are already under development. As it has a wide field and is the subject of constant research, the ophthalmic area allows additive manufacturing to still be widely used in favor of doctors and patients.


Subject(s)
Humans , Ophthalmology , Imaging, Three-Dimensional , Printing, Three-Dimensional , Polymers , Prostheses and Implants , Biosensing Techniques , Computer-Aided Design , Recycling , Bioprinting , Stereolithography , Models, Anatomic
11.
Braz. dent. sci ; 25(3): 1-7, 2022. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1391021

ABSTRACT

Objective: Compare the palatal volume in children with unilateral cleft lip and palate before and after two surgical protocols. Material and Methods: Retrospective data collection was performed in a specialized hospital. The sample comprised 120 digitized dental models divided into, Group 1 (G1) ­ participants submitted to cheiloplasty at 3 months (Millard technique) and one-step palatoplasty at 12 months (von Langenbeck technique); Group 2 (G2) ­ participants submitted to cheiloplasty (Millard technique) and hard palate closure (Hans Pichler technique) at 3 months and soft palate closure at 12 months (Sommerlad technique). The dental models were evaluated at Time 1 (T1): before primary plastic surgeries, Time 2 (T2): 1st post-surgical phase, and Time 3 (T3): 2nd post-surgical phase. The volume was measured through stereophotogrammetry system software. Parametric and non-parametric statistical tests were applied (α=5%). Results: The intragroup analysis revealed that G1 had a statistically significant increase in volume at T2 followed by a reduction at T3 (p=0.003); G2 showed a statistically significant increase of dental arch volume between T1 and T2 (p=0.001). There was no statistically significant difference in the intergroup and gender analyses (p>0.05). Conclusion: The surgical protocol influenced the palatal volume of children with unilateral cleft lip and palate. This study suggested that two-step palatoplasty protocol has a tendency to be more appropriate.(AU)


Objetivo: Comparar o volume palatino em crianças com fissura unilateral de lábio e palato antes e após dois protocolos cirúrgicos. Material e Métodos: A coleta de dados retrospectiva foi efetuada em um hospital especializado. A amostra foi composta por 120 modelos dentários digitalizados divididos em, Grupo 1 (G1) ­ participantes submetidos a queiloplastia aos 3 meses de vida (técnida de Millard) e a palatoplastia em única etapa aos 12 meses (técnica de von Langenbeck); Grupo 2 (G2) ­ participantes submetidos a queiloplastia (técnica de Millard) e fechamento do palato duro (técnica de Hans Pichler) aos 3 meses de vida e fechamento do palate mole aos 12 meses (técnica de Sommerlad). Os modelos dentários foram avaliados em Tempo 1 (T1): antes das cirurgias plásticas primárias, Tempo 2 (T2):1ª fase pós-cirúrgica e Tempo 3 (T3): 2ª fase pós-cirúrgico. O volume foi mensurado por meio do software do sistema de estereofotogrametria. Testes estatísticos paramétricos e não-paramétricos foram utilizados (α=5%). Resultados: As análises intragrupos indicaram que G1 apresentou aumento estatisticamente significante em T2 seguido de redução em T3 (p=0.003). G2 apresentou crescimento estatisticamente significativo do volume palatino entre T1 e T2 (p=0.001). Não houve diferença estatisticamente significante nas análises intergrupos e entre gêneros (p>0.05). Conclusão: O protocolo cirúrgico influenciou o volume palatino das crianças com fissura unilateral de lábio e palato. Este estudo sugeriu que o protocolo da palatoplastia em duas etapas possui uma tendência de ser mais apropriado.(AU)


Subject(s)
Cleft Lip , Cleft Palate , Oral Surgical Procedures , Imaging, Three-Dimensional , Dental Arch
12.
Article in Chinese | WPRIM | ID: wpr-936374

ABSTRACT

OBJECTIVE@#To explore the clinical value of three-dimensional (3D) visualization technique in laparoscopic D3 radical resection of right colon cancer.@*METHODS@#We retrospectively analyzed the clinical data of 73 patients with right colon cancer undergoing laparoscopic D3 radical operation in our hospital between May, 2019 and March, 2021. Among these patients, 41 underwent enhanced CT examination with 3D visualization reconstruction to guide the actual operation, and 32 underwent enhanced CT examination only before the operation (control group). In 3D visualization group, we examined the coincidence rate between the 3D visualization model and the findings in surgical exploration of the anatomy and variations of the main blood vessels, supplying vessels of the tumor, and the tumor location, and the coincidence rate between the actual surgical plan for D3 radical resection of right colon cancer and the plan formulated based on the 3D model. The operative time, estimated blood loss, unexpected injury of blood vessels, number of harvested lymph nodes, mean time of the first flatus, complications, postoperative hospital stay and postoperative drainage volume were compared between the two groups.@*RESULTS@#The operative time was significantly shorter in 3D visualization group than in the control group (P < 0.05). The volume of blood loss, proportion of unexpected injury of blood vessel, the number of harvested lymph nodes, time of the first flatus, proportion of complications, postoperative hospital stay and postoperative drainage volume did not differ significantly between the two groups (P > 0.05). In the 3D visualization group, the 3D visualization model clearly displayed the shape and direction of the colon, the location of the tumor, the anatomy and variation of the main blood vessels and the blood vessels supplying the cancer, and showed a coincidence rate of 100% with the findings by surgical exploration. The surgical plan for D3 radical resection of right colon cancer was formulated based on the 3D model also showed a coincidence rate of 100% with the actual surgical plan.@*CONCLUSION@#The 3D visualization reconstruction technique allows clear visualization the supplying arteries of the tumor and their variations to improve the efficiency, safety and accuracy of laparoscopic D3 radical resection of right colon cancer.


Subject(s)
Colonic Neoplasms/surgery , Flatulence/surgery , Humans , Imaging, Three-Dimensional , Laparoscopy/methods , Lymph Node Excision/methods , Postoperative Complications , Retrospective Studies , Treatment Outcome
13.
Article in Chinese | WPRIM | ID: wpr-936259

ABSTRACT

Objective: The characteristics of 3D-FLAIR MRI images of the inner ear of patients with vestibular neuritis were preliminarily studied to explore the possible pathogenesis of vestibular neuritis, and the correlation analysis was conducted in combination with vestibular function to provide a basis for accurate diagnosis of vestibular neuritis. Methods: A total of 36 patients with vestibular neuritis (VN) from December 2019 to October 2020 were collected from the Vertigo Department of Shandong Provincial ENT Hospital, Cheeloo College of Medicine, Shandong University. There were 36 cases (18 females, 18 males) with unilateral acute vestibular neuritis, 17 cases of left ear and 19 cases of right ear. According to the results of 3D-FLAIR MRI in the inner ears, the patients were divided into the enhanced group and the non-enhanced group (the health side served as the normal control group). The results of vestibular function examination in the two groups were compared. SPSS19.0 software was used for statistical processing to analyze the relationship between the vestibular function and the characteristics of 3D-FLAIR imaging in the inner ears. Results: Abnormal enhancement of 3D-FLAIR was found in 31 cases (86.1%) of the 36 cases, including 14 cases of both vestibular nerve and vestibular terminal organ enhancement, eight cases of superior vestibular nerve enhancement alone, seven cases of vestibular terminal organ enhancement alone, and two cases of cochlear enhancement alone. Observation of abnormal reinforcement of vestibular nerve showed: twenty-one cases of superior vestibular nerve reinforcement, one case of superior and inferior vestibular nerve reinforcement. No abnormalities were found in 3D-FLAIR of inner ear in 5 cases. According to the analysis of vestibular function results, there were 19 cases (52.8%) with total vestibular involvement, sixteen cases (44.4%) with superior vestibular involvement alone, and one case (2.8%) with inferior vestibular involvement alone. Comparison of vestibular function between the five cases (non-enhancement group) and the 31 cases (enhanced group) in the 3D-FLAIR group of the inner ears showed that the CP values of caloric tests in the enhanced group were higher (60.81±3.49 vs 34.12±7.37), with statistically significant difference (t=-2.898, P<0.01). Conclusion: In patients with vestibular neuritis, 3D-FLAIR MRI scan of the inner ear provides visual imaging evidence for clinical practice, considering that the lesion site of vestibular neuritis is not only in the vestibular nerve, but also in the vestibular end organ. Patients with 3D-FLAIR enhanced in the inner ear may have more significant vestibular function damage.


Subject(s)
Caloric Tests , Female , Humans , Imaging, Three-Dimensional/methods , Magnetic Resonance Imaging/methods , Male , Vestibular Neuronitis/diagnosis , Vestibule, Labyrinth
14.
Article in Chinese | WPRIM | ID: wpr-928848

ABSTRACT

The glasses-free three dimensional(3D) endoscopic display system provides the surgeon with the depth information of the minimally invasive surgery scene obtained from the binocular perspective, which can effectively relieve the surgeon's posture fatigue and visual fatigue during the long-term surgery, and assist in the operation of surgical instruments more accurately to reduce the damage to the surrounding tissues of the operation area. However, the glasses-free 3D display device currently has the problem of a narrow optimal viewing zone and easy crosstalk, especially in the surgical teaching application scenario, which performs poorly. In order to overcome the limitation of the narrower field of view, we introduce deep learning algorithms to detect and locate multiple faces, fine-tune the 3D display grating of the endoscope, rearrange pixels, and change the best view area, so that more people can get the best view. The experimental results show that the face detection accuracy of the method is 97.88%, and the detection time is 135 frames/ms, which achieves high accuracy while maintaining real-time performance.


Subject(s)
Endoscopes , Endoscopy , Humans , Imaging, Three-Dimensional , Minimally Invasive Surgical Procedures , Surgical Instruments
15.
Chinese Journal of Stomatology ; (12): 358-365, 2022.
Article in Chinese | WPRIM | ID: wpr-935875

ABSTRACT

Objective: To explore the establishment of an efficient and automatic method to determine anatomical landmarks in three-dimensional (3D) facial data, and to evaluate the effectiveness of this method in determining landmarks. Methods: A total of 30 male patients with tooth defect or dentition defect (with good facial symmetry) who visited the Department of Prosthodontics, Peking University School and Hospital of Stomatology from June to August 2021 were selected, and these participants' age was between 18-45 years. 3D facial data of patients was collected and the size normalization and overlap alignment were performed based on the Procrustes analysis algorithm. A 3D face average model was built in Geomagic Studio 2013 software, and a 3D face template was built through parametric processing. MeshLab 2020 software was used to determine the serial number information of 32 facial anatomical landmarks (10 midline landmarks and 22 bilateral landmarks). Five male patients with no mandibular deviation and 5 with mild mandibular deviation were selected from the Department of Orthodontics or Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology from June to August 2021. 3D facial data of patients was collected as test data. Based on the 3D face template and the serial number information of the facial anatomical landmarks, the coordinates of 32 facial anatomical landmarks on the test data were automatically determined with the help of the MeshMonk non-rigid registration algorithm program, as the data for the template method to determine the landmarks. The positions of 32 facial anatomical landmarks on the test data were manually determined by the same attending physician, and the coordinates of the landmarks were recorded as the data for determining landmarks by the expert method. Calculated the distance value of the coordinates of facial anatomical landmarks between the template method and the expert method, as the landmark localization error, and evaluated the effect of the template method in determining the landmarks. Results: For 5 patients with no mandibular deviation, the landmark localization error of all facial anatomical landmarks by template method was (1.65±1.19) mm, the landmark localization error of the midline facial anatomical landmarks was (1.19±0.45) mm, the landmark localization error of bilateral facial anatomical landmarks was (1.85±1.33) mm. For 5 patients with mild mandibular deviation, the landmark localization error of all facial anatomical landmarks by template method was (2.55±2.22) mm, the landmark localization error of the midline facial anatomical landmarks was (1.85±1.13) mm, the landmark localization error of bilateral facial anatomical landmarks was (2.87±2.45) mm. Conclusions: The automatic determination method of facial anatomical landmarks proposed in this study has certain feasibility, and the determination effect of midline facial anatomical landmarks is better than that of bilateral facial anatomical landmarks. The effect of determining facial anatomical landmarks in patients without mandibular deviation is better than that in patients with mild mandibular deviation.


Subject(s)
Adolescent , Adult , Algorithms , Anatomic Landmarks , Cephalometry/methods , Face/anatomy & histology , Female , Humans , Imaging, Three-Dimensional/methods , Male , Malocclusion , Middle Aged , Orthodontics , Software , Young Adult
16.
Chinese Journal of Stomatology ; (12): 162-167, 2022.
Article in Chinese | WPRIM | ID: wpr-935843

ABSTRACT

Objective: To evaluate the effect of adding a geometric feature on the accuracy of digital impressions obtained by intraoral scanners for implant restoration of edentulous jaw quantitatively. Methods: A dentiform model of the maxilla of completely edentulous arch with 6 implant analogs+scan bodies (No. 1-6) was selected as the reference model. Without geometric feature, the dentiform model was scanned by dental model scanner and repeated for 5 times as true value group. Before and after adding the geometric feature, the same operator used intraoral scanner A (Trios 3) and B (Aoralscan 2) to scan the dentiform model with the same scanning path. Each type of intraoral scanner scanned 10 times and ".stl " datas were obtained. The results were imported into reverse engineering software (Geomagic Studio 2015). The linear distances of center point of upper plane between sacn body 1 to 6 was calculated, denoted as D12, D13, D14, D15 and D16. Trueness was the absolute value subtracted from the measured value of the intraoral scanner groups and true value; precision was the absolute value of pairwise subtraction of the measured values in the intraoral scanner groups.The smaller the value, the better the accuracy or precision.With or without the feature, all scan data were statistically analyzed, and the effect of adding geometric feature on the trueness and precision of the two intraoral scanners were evaluated. Results: As for intraoral scanner A, with the feature in place, significant differences were found in D14, D15, D16 for tureness(t=2.66, 2.75, 2.95, P<0.05); the trueness for D16 decreased from (101.9±47.1) μm to (49.6±30.3) μm. On the other hand, with features on the edentulous area, the precision was significantly increased in D15 and D16 (U=378.00, 672.00, P<0.05); the precision for D15 decreased from 40.8 (45.1) μm to 13.1 (17.0) μm. As for intraoral scanner B, the trueness of D12, D13 and D14 after adding geometric features was significantly better than before (t=3.02, 2.66, U=22.00, P<0.05). With feature on the edentulous area, the trueness for D13 decreased from (116.6±41.2) μm to (70.8±35.5) μm. There was no statistical significance in the trueness of D15 and D16 with or without geometric feature (P>0.05), however, the precision of D15 and D16 after adding geometric feature was significantly better than before (U=702.00, 489.00,P<0.05). The precision of D16 decreased from 112.5 (124.7) μm to 35.9 (85.8) μm. Conclusions: The use of geometric feature in edentulous space improves the trueness and precision of the different principle intraoral scanners tested.


Subject(s)
Computer-Aided Design , Dental Implants , Dental Impression Technique , Imaging, Three-Dimensional , Models, Dental
17.
Chinese Journal of Surgery ; (12): 249-256, 2022.
Article in Chinese | WPRIM | ID: wpr-935608

ABSTRACT

Objective: To investigate the application effect of augmented reality and mixed reality navigation technology in three-dimensional(3D) laparoscopic narrow right hepatectomy(LRH). Methods: A retrospective analysis was performed on the clinical data of 5 patients with hepatic malignancy admitted to the First Department of Hepatobiliary Surgery,Zhujiang Hospital,Southern Medical University from September 2020 to June 2021,all of whom were males,aged from 42 to 74 years.Preoperative evaluation was performed using the self-developed 3D abdominal medical image visualization system; if all the 5 patients were to receive right hemihepatectomy,the remnant liver volume would be insufficient,so LRH were planned.During the operation,the independently developed 3D laparoscopic augmented reality and mixed reality surgical navigation system was used to perform real-time multi-modal image fusion and interaction between the preoperative 3D model and 3D laparoscopic scene.Meanwhile,intraoperative ultrasound assisted indocyanine green fluorescence was used to determine the surgical path.In this way,the LRH under the guidance of augmented reality and mixed reality navigation was completed.The predicted liver resection volume was evaluated before surgery,actual resected liver volume,surgical indicators and postoperative complications were analyzed. Results: All the 5 patients completed LRH under the guidance of augmented reality and mixed reality navigation technology,with no conversion to laparotomy.The median operative time was 300 minutes(range:270 to 360 minutes),no intraoperative blood transfusion was performed,and the median postoperative hospital stay was 8 days(range:7 to 9 days).There were no perioperative deaths,or postoperative complications such as liver failure,bleeding,or biliary fistula. Conclusion: For patients who need to undergo LRH,the use of augmented and mixed reality navigation technology can safely and effectively guide the implementation of surgery,retain more functional liver volume,improve surgical safety,and reduce postoperative complications.


Subject(s)
Adult , Aged , Augmented Reality , Hepatectomy/methods , Humans , Imaging, Three-Dimensional , Laparoscopy/methods , Liver Neoplasms/surgery , Male , Middle Aged , Retrospective Studies , Technology
18.
Chinese Journal of Surgery ; (12): 17-21, 2022.
Article in Chinese | WPRIM | ID: wpr-935573

ABSTRACT

Mixed reality is a new three-dimensional presentation technology that combines the virtual digital world with the real world, which has been initially applied in the field of hepatobiliary surgery. Compared with virtual reality, augmented reality and three-dimensional visualization technology, mixed reality technology has unique advantages in preoperative evaluation and formulation of surgical plan, real-time accurate navigation during operation and three-dimensional virtual teaching. And it is a new generation of auxiliary tool for precision hepatobiliary surgery. This paper describes the application and research progress of mixed reality technology in the field of hepatobiliary surgery, and discusses its application potential and current limitations.


Subject(s)
Augmented Reality , Humans , Imaging, Three-Dimensional , Surgery, Computer-Assisted , Technology , Virtual Reality
19.
Neuroscience Bulletin ; (6): 303-317, 2022.
Article in English | WPRIM | ID: wpr-929085

ABSTRACT

Understanding the connection between brain and behavior in animals requires precise monitoring of their behaviors in three-dimensional (3-D) space. However, there is no available three-dimensional behavior capture system that focuses on rodents. Here, we present MouseVenue3D, an automated and low-cost system for the efficient capture of 3-D skeleton trajectories in markerless rodents. We improved the most time-consuming step in 3-D behavior capturing by developing an automatic calibration module. Then, we validated this process in behavior recognition tasks, and showed that 3-D behavioral data achieved higher accuracy than 2-D data. Subsequently, MouseVenue3D was combined with fast high-resolution miniature two-photon microscopy for synchronous neural recording and behavioral tracking in the freely-moving mouse. Finally, we successfully decoded spontaneous neuronal activity from the 3-D behavior of mice. Our findings reveal that subtle, spontaneous behavior modules are strongly correlated with spontaneous neuronal activity patterns.


Subject(s)
Animals , Behavior, Animal , Brain/diagnostic imaging , Imaging, Three-Dimensional/methods , Mice , Neuroimaging , Rodentia
20.
Article in Chinese | WPRIM | ID: wpr-928315

ABSTRACT

OBJECTIVE@#To investigate the effect of internal external fixator assisted O-arm navigation imaging in the treatment of unstable pelvic fractures.@*METHODS@#From May 2019 to November 2019, 15 patients with unstable pelvic fractures were treated by intraoperative O-arm navigation imaging using INFIX technology. There were 6 males and 9 females. The age ranged from 24 to 66 years old. The course of disease ranged from 2 to 14 days. According to Tile classification, there were 1 case of B1 type, 8 cases of B2 type, 3 cases of C1 type, and 3 cases of C2 type. According to Young-Burgess classification, there were 8 cases of LC, 1 case of APC, 4 cases of VS, 2 cases of CM. Preoperative routine pelvic anteroposterior film, entrance position, exit position and pelvic CT three-dimensional reconstruction were performed. Intraoperative O-arm navigation system three-dimensional reconstruction and triplane scanning imaging were used to evaluate the effect of intraoperative reduction. The anterior pelvic ring was fixed with internal external fixator, and the posterior ring was fixed with sacroiliac screw, plate screw or lumbar iliac screw. The operation time, intraoperative bleeding and nail placement were observed and recorded. The quality of fracture reduction was evaluated by Matta standard, and the postoperative function was evaluated by Majeed function score.@*RESULTS@#Wound healing was good in all patients without vascular, nerve and local irritation complications. All the 15 patients were followed up for 10 to 16 months. The fracture reduction was evaluated according to the Matta scoring standard, 9 cases were excellent results, 5 cases were good, and 1 case was medium. The Majeed functional score was 0 to 95 points.@*CONCLUSION@#The built-in external fixator assisted O-arm navigation imaging system in the treatment of unstable pelvic fractures. The reduction effect is evaluated in advance, the operation time is shortened, and the accuracy of internal fixation is improved. The operation is simple, safe and less bleeding. The operation is in line with the principles of minimally invasive medical treatment and precision medical treatment in orthopedics, which is conducive to the recovery of patients' postoperative function and rapid recovery.


Subject(s)
Adult , Aged , Bone Plates , Female , Fracture Fixation, Internal/methods , Fractures, Bone/surgery , Humans , Imaging, Three-Dimensional , Male , Middle Aged , Surgery, Computer-Assisted , Tomography, X-Ray Computed , Young Adult
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