ABSTRACT
Los septos del seno maxilar son variantes anatómicas que se forman como resultado de los residuos de la hipoplasia en diferentes áreas del proceso alveolar siendo de forma, tamaño y número variable. Su hallazgo se puede realizar mediante radiografÃas panorámicas de rutina. La importancia de un septo en el seno maxilar es que puede generar modificaciones para las cirugÃas, pudiendo ser necesario abrir dos o más ventanas quirúrgicas para su remoción. Objetivo: La finalidad de este estudio fue analizar los rasgos tomográficos de los septos del seno maxilar en pacientes que asistieron entre los años 2014 - 2016 a la clÃnica dental docente de la Universidad Peruana Cayetano Heredia. Materiales y métodos: Esta investigación fue de tipo transversal y descriptivo, para ello se examinaron 813 tomografÃas computarizadas volumétricas. La prueba de chi cuadrado y la estadÃstica descriptiva se usaron para el análisis, con un intervalo de confianza al 95%, con un valor p < 0,05. Resultados: 298 pacientes presentaron septos, presentando mayor porcentaje los septos congénitos (69.2%) y fueron más comunes en pacientes de sexo femenino con un 36%.Conclusiones: prevalecieron los septos de tipo congénito, lo que indica que se formaron a partir del desarrollo radicular.
The septa of the maxillary sinus are anatomical variants that are formed as a result of the residues of hypoplasia in different areas of the alveolar process, being of variable shape, size and number.Your finding can be made using routine panoramic radiographs. The importance of a septum in the maxillary sinus is that it can generate modifications for maxillary sinus surgeries, and it may be necessary to open two or more surgical windows for its removal. Objective: The purpose of this study was to analyze the tomographic features of the maxillary sinus septa in patients who attended the teaching dental clinic of the Universidad Peruana Cayetano Heredia between 2014- 2016. Materials and methods: This research was cross-sectional and descriptive, for which 813 cone beam CT scans were examined. Chi square test and descriptive statistics were used for the analysis, with a 95% confidence interval, with a value p < 0.05. Results: 298 patients presented septa, with a higher percentage of congenital septa (69.2%) and were more common in female patients with 36%. Conclusions: the congenital type septa prevailed, which indicates that they were formed from root development.
ABSTRACT
BACKGROUND/AIMS: Computed tomography (CT) hepatic volumetry is currently accepted as the most reliable method for preoperative estimation of graft weight in living donor liver transplantation (LDLT). However, several factors can cause inaccuracies in CT volumetry compared to real graft weight. The purpose of this study was to determine the frequency and degree of resection plane-dependent error in CT volumetry of the right hepatic lobe in LDLT. METHODS: Forty-six living liver donors underwent CT before donor surgery and on postoperative day 7. Prospective CT volumetry (VP) was measured via the assumptive hepatectomy plane. Retrospective liver volume (VR) was measured using the actual plane by comparing preoperative and postoperative CT. Compared with intraoperatively measured weight (W), errors in percentage (%) VP and VR were evaluated. Plane-dependent error in VP was defined as the absolute difference between VP and VR. % plane-dependent error was defined as follows: |VP–VR|/W∙100. RESULTS: Mean VP, VR, and W were 761.9 mL, 755.0 mL, and 696.9 g. Mean and % errors in VP were 73.3 mL and 10.7%. Mean error and % error in VR were 64.4 mL and 9.3%. Mean plane-dependent error in VP was 32.4 mL. Mean % plane-dependent error was 4.7%. Plane-dependent error in VP exceeded 10% of W in approximately 10% of the subjects in our study. CONCLUSIONS: There was approximately 5% plane-dependent error in liver VP on CT volumetry. Plane-dependent error in VP exceeded 10% of W in approximately 10% of LDLT donors in our study. This error should be considered, especially when CT volumetry is performed by a less experienced operator who is not well acquainted with the donor hepatectomy plane.
Subject(s)
Humans , Cone-Beam Computed Tomography , Hepatectomy , Liver Transplantation , Liver , Living Donors , Methods , Organ Size , Prospective Studies , Retrospective Studies , Tissue Donors , TransplantsABSTRACT
PURPOSE: We investigated the relationship between various parameters, including volumetric parameters, and tumor invasiveness according to the International Association for the Study of Lung Cancer (IASLC)/American Thoracic Society (ATS)/European Respiratory Society (ERS) classification. MATERIALS AND METHODS: We retrospectively reviewed 99 patients with completely resected stage IA lung adenocarcinoma. The correlation between several parameters [one-dimensional ground glass opacity (1D GGO) ratio, two-dimensional (2D) GGO ratio, three-dimensional (3D) GGO ratio, 1D solid size, 2D solid size, and 3D solid size] and tumor invasiveness according to IASLC/ATS/ERS classification was investigated using receiver operating characteristic (ROC) analysis. Adenocarcinoma in situ and minimally invasive adenocarcinoma were referred to as noninvasive adenocarcinoma. RESULTS: The areas under the curve (AUC) to predict invasive adenocarcinoma for the 1D, 2D, and 3D GGO ratios were 0.962, 0.967, and 0.971, respectively. The optimal cut-off values for the 1D, 2D, and 3D GGO ratios were 38%, 62%, and 74%, respectively. The AUC values for 1D, 2D, and 3D solid sizes to predict invasive adenocarcinoma were 0.933, 0.944, and 0.903, respectively. The optimal cut-off values for 1D, 2D, and 3D solid sizes were 1.2 cm, 1.5 cm2, and 0.7 cm3, respectively. The difference in the ROC curves for 3D GGO ratio and 3D solid size was significant (p=0.01). CONCLUSION: Computed tomography image-related parameters based on GGO were well correlated with and predictive of invasiveness according to IASLC/ATS/ERS classification. 3D GGO ratio was more strongly correlated with pathologic invasiveness than 3D solid size.
Subject(s)
Adult , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Adenocarcinoma/diagnostic imaging , Area Under Curve , Imaging, Three-Dimensional , Lung Neoplasms/diagnostic imaging , Neoplasm Invasiveness , Neoplasm Staging , Predictive Value of Tests , ROC Curve , Retrospective Studies , Tomography, X-Ray Computed , Tumor BurdenABSTRACT
O presente estudo in vivo propôs avaliar a precisão de instalação de 23 implantes sem retalhos empregando guias cirúrgicos obtidos por estereolitografia em quatro pacientes com maxilas totalmente desdentadas. Após duplo escaneamento com tomografia computadorizada tipo cone-beam, o planejamento pré-cirúrgico foi realizado com o programa Procera. Depois da cirurgia, realizou-se a comparação entre as posições dos implantes planejados e executados através de tomografia computadorizada pós-operatória. Para comparação da posição e dos longos eixos das imagens dos implantes foram eleitos três pontos em cada implante planejado e executado: no centro do limite coronário (D1), no centro da porção central (D2), no centro do limite apical (D3). Assim, as distâncias e o ângulo (A1) formado entre os longos eixos dos implantes planejados e executados foram numericamente calculados. De acordo com a análise tomográfica, os implantes executados em relação aos implantes planejados apresentaram desvios médios de 0,72 mm para a posição D1; 0,98 mm para a posição D2; 1,45 mm para a posição D3; 1,92 graus para o ângulo A1. Concluiu-se que houve desempenho adequado para a utilização de protocolos de cirurgia guiada baseados no método empregado em associação com guias cirúrgicos produzidos pelo processo de estereolitografia. A transferência do planejamento protético-cirúrgico para o campo operatório foi considerada satisfatória, visto que viabilizou a instalação de implantes dentários nas situações propostas...
The aim of this in vivo study was to evaluate the placement accuracy of 23 dental implants with fl apless surgery using stereolithographic guides in four completely edentulous maxillary patients. After double scanning with cone beam computerized tomography (CBCT), the presurgical planning was performed using appropriate software (Procera). After surgery, executed and planned implant positions were compared using CBCT superimposing. Measurements were made at the center of three pre-selected points: coronal (D1), central (D2), and apical (D3) portions. Thus, the distances among points and the angle (A1) formed between the long axes of the planned/executed implants were calculated. Mean deviations were as the following: 0.72 mm at D1, 0.98 mm at D2, and 1.45 mm at D3 positions. The mean angular deviaton (A1) was 1.92 degrees. It was concluded that there was adequate performance with surgical guides produced by stereolithographic process. The transfer of prosthetic-surgical planning for the surgical area was considered satisfactory, since it allowed for implant placement in proposed situations...
Subject(s)
Humans , Cone-Beam Computed Tomography , Dental Implants , Stereotyping , Surgery, Computer-AssistedABSTRACT
Introducción: los procedimientos quirúrgicos que se realizan en la mandíbula requieren conocimiento detallado de la posición y trayectoria del conducto alveolar inferior (CAI) que contiene en su interior al nervio alveolar inferior (NAI). La tomografía volumétrica computarizada (TCCB) es un medio diagnóstico subutilizado en nuestro medio principalmente por los costos, sin embargo es un medio sensible y preciso para la evaluación del CAI por encima de otros medios diagnósticos. Métodos: se evaluaron 50 tomografías volumétricas computarizadas de última generación con tecnología Cone Beam (TCCB) de las mandíbulas de pacientes mayores de dieciocho años, con premolares y molares mandibulares en boca, sin anomalías evidentes de los maxilares, patologías mandibulares y patologías que comprometieran la calidad ósea, se realizaron cortes transeccionales e imágenes panorámicas. Resultados: el promedio de distancia del CAI a la cresta alveolar fue 17,9 mm en mujeres y 19,8 en hombres, hacia la tabla vestibular el promedio fue 3,8 mm para ambos sexos; hacia la tabla lingual de 3,2 mm en mujeres y en hombres de 2,8; el promedio del CAI al borde basilar fue 6,5 mm para mujeres y 6,2 en hombres y del borde anterior de rama al foramen mandibular el promedio fue 12,3 mm para mujeres y 13,2 en hombres. Conclusiones: la TCCB es una ayuda diagnóstica altamente sensible para la ubicación de la posición y trayectoria del CAI, no hubo diferencias significativas en cuanto a edad y lados, de las medidas tomadas en los tres sectores del cuerpo mandibular.
Introduction: surgical procedures involving the mandible require a deep understanding of the position and course of the inferior alveolar conduct (IAC) that encloses the inferior alveolar nerve. Computerized volumetric tomography (CVT) is an under used diagnostic tool in our context, mostly because of the costs it compels, nevertheless its a sensitive and precise method for the evaluation of IAC above other diagnostic current tools. Method: 50 last generation computerized volumetric tomographies, using Cone Beam technology, were evaluated in 18 years old patients or older, with premolars and molars present, without any evident maxillary anomalies, mandibular pathology or alteration that decrease bone quality. Panoramic and transectional cuts were performed. Results: the average distance from IAC to alveolar crest was 17.9 mm for women and 19.8 mm for men. The average distance from IAC to the vestibular plate was 3.8 mm for both genders towards the lingual plate, the distances from IAC was 3,2mm for women and 2.8 mm for men. The average distance from basilar border to IAC was 6.5 mm for women and 6.2 mmfor men. From the mandibular foramen to anterior border of mandibular ramus, the average distance for men was 13.2 mm and 12.3 mm for women. Conclusion: CVT is a highly sensitive diagnostic tool for the assessment of IAC position and course. Therewere no differences regarding age or between both sides of the mandible among the three measured points on the mandibular body.
Subject(s)
Humans , Cone-Beam Computed Tomography , TomographyABSTRACT
BACKGROUND/AIMS: Invasive coronary angiography remains the gold standard in the diagnosis of coronary artery disease. However, multidetector CT (MDCT) coronary angiography is an emerging technique that is available for the non-invasive detection of coronary artery stenoses. While the diagnostic accuracy of first generation MDCT is limited, recently released 64-slice MDCT has yielded promising results due to increased temporal and spatial resolution. The objective of this study was to investigate the diagnostic accuracy of non-invasive 64-slice MDCT for coronary artery disease. METHODS: One hundred one patients (63 males and 38 females; mean age, 63.7+/-10.5 years) undergoing conventional coronary angiography were included in this study. All coronary arteries, including the distal segments and side branches, were analyzed for the presence of significant stenosis (> or =50% diameter stenosis) and compared with of the quantitative coronary angiographic findings. RESULTS: Of the 1,440 coronary artery segments studied, 1,348 segments were assessed quantitatively by both MDCT and conventional coronary angiography (94%). Two hundred nine significant stenoses were detected by conventional coronary angiography. On a segment-based analysis, the senisitivity, specificity, and positive and negative predictive values of 64-slice MDCT were 96, 97, 85, and 99%, respectively. On a vessel-based analysis, the sensitivity, specificity, and positive and negative predictive values of 64-slice MDCT were 96, 97, 85, and 99%, respectively. The corresponding values obtained on a patient-based analysis were 100, 94, 97, and 100%, respectively. Coronary calcification was the major cause of false-positive findings. CONCLUSIONS: This study demonstrated that 64-slice MDCT coronary angiography is of similar accuracy as conventional coronary angiography for the detection of coronary artery disease. In selected groups of patients, 64-slice MDCT may replace the more invasive coronary angiography.