RESUMEN
OBJECTIVES: This study evaluated the agreement of computed tomography (CT) imaging using 3D reformations (3DR) with shaded surface display (SSD) and maximum intensity projection (MIP) in the diagnosis of bone changes in mandibular condyles of patients with rheumatoid arthritis (RA), and compared findings with multiplanar reformation (MPR) images, used as the criterion standard. MATERIAL AND METHODS: Axial CT images of 44 temporomandibular joints (TMJs) of 22 patients with RA were used. Images were recorded in DICOM format and assessed using free software (ImageJ). Each sample had its 3DR-SSD and 3DR-MIP results compared in pairs with the MPR results. RESULTS: Slight agreement (k = 0.0374) was found in almost all comparisons. The level of agreement showed that 3DR-SSD and 3DR-MIP yielded a number of false-negative results that was statistically significant when compared with MPR. CONCLUSIONS: 3DR-SSD or 3DR-MIP should only be used as adjuvant techniques to MPR in the diagnosis of bone changes in mandibular condyles.
Asunto(s)
Artritis Reumatoide/diagnóstico por imagen , Cóndilo Mandibular/diagnóstico por imagen , Interpretación de Imagen Radiográfica Asistida por Computador/métodos , Trastornos de la Articulación Temporomandibular/diagnóstico por imagen , Articulación Temporomandibular/diagnóstico por imagen , Adulto , Anciano , Artritis Reumatoide/patología , Reacciones Falso Negativas , Femenino , Humanos , Imagenología Tridimensional/métodos , Masculino , Cóndilo Mandibular/patología , Persona de Mediana Edad , Valor Predictivo de las Pruebas , Sistemas de Información Radiológica , Reproducibilidad de los Resultados , Programas Informáticos , Articulación Temporomandibular/patología , Trastornos de la Articulación Temporomandibular/patología , Tomografía Computarizada EspiralRESUMEN
BACKGROUND: Selective laser sintering (SLS), three-dimensional printing (3DP) and PolyJet are rapid prototyping (RP) techniques to fabricate prototypes from virtual biomedical images. To be used in maxillofacial surgery, these models must accurately reproduce the craniofacial skeleton. PURPOSE: To analyze the capacity of SLS, 3DP and PolyJet models to reproduce mandibular anatomy and their dimensional error. MATERIAL: Dry mandible, helical CT images, SLS, 3DP and PolyJet prototypes, and digital electronic caliper. METHODS: Helical CT images were acquired from a dry mandible (criterion standard) and manipulated with the InVesalius software. Prototypes were produced using SLS, 3DP and PolyJet techniques. Thirteen linear measurements of each prototype were made and compared with the dry mandible measurements. RESULTS: The results showed a dimensional error of 1.79%, 3.14% and 2.14% for SLS, 3DP and PolyJet models, respectively. The models satisfactorily reproduced anatomic details and the SLS and PolyJet prototypes showed greater dimensional precision and reproduced mandibular anatomy more accurately than the 3DP model. CONCLUSIONS: The SLS prototype had a greater dimensional accuracy than the PolyJet and 3DP models. The PolyJet technique reproduced anatomic details of the mandible more accurately.
Asunto(s)
Anatomía Transversal/métodos , Cefalometría/métodos , Imagenología Tridimensional/métodos , Mandíbula/anatomía & histología , Modelos Anatómicos , Anatomía Transversal/instrumentación , Cefalometría/instrumentación , Simulación por Computador , Diseño Asistido por Computadora , Humanos , Rayos Láser , Procedimientos Quirúrgicos Orales/métodos , Planificación de Atención al Paciente , Diseño de Prótesis/instrumentación , Diseño de Prótesis/métodos , Estadísticas no Paramétricas , Tomografía Computarizada EspiralRESUMEN
Conventional radiographs provide bi-dimensional images of three-dimensional structures limiting optimal treatment planning. To overcome this deficiency, Computed Tomography (CT) has been used as a diagnostic method in Medicine and Dentistry. CT allows for supernumerary teeth location, the establishment of positional relations with other teeth, and the assessment of surrounding bone thickness; thus, facilitating surgical access and technique choice while reducing the procedure time, of great importance in pediatric dental care. The aim of this study was to present the possibility of applying CT for supernumerary teeth location, through the case report of a five-year-old female patient presenting two supernumerary teeth in the anterior palatal area. In conclusion, CT appears to be an excellent image diagnostic method for locating unerupted supernumerary teeth, providing precise information for planning and performing the surgical approach, while reducing operatory time and post-operatory complications; factors of extreme importance when treating young children.