La reproducibilidad de la alineación dental en medidas digitales y manuales

Introducción: La incorporación de modelos digitales ofrece al ortodoncista una alternativa a los modelos de estudio de yeso que se utilizan habitualmente. Estos son un componente estándar de los registros de ortodoncia y son fundamentales para el diagnóstico y la planificación del tratamiento. No obstante, es importante indagar sobre la confiabilidad de las nuevas tecnologías. Objetivo: Evaluar la reproducibilidad de las medidas digitales y manuales de alineación dental en modelos iniciales de pacientes de ortodoncia. Métodos: Se realizó un estudio de evaluación de tecnología diagnóstica, con 80 modelos de yeso, que fueron digitalizados con el escáner Ineos X5. Una vez obtenidos los modelos en yeso y sus imágenes digitales, el investigador que obtuvo el mejor resultado en la calibración inter e intra examinador realizó la medición de la alineación dental. Las medidas manuales se tomaron con un calibrador digital, y las digitales fueron tomadas en el software Nemocast. El análisis incluyó el cálculo del coeficiente de correlación intraclase (CCI) y los límites de acuerdo de Bland y Altman. Un valor de p < 0,05 fue considerado como estadísticamente significativo. Resultados: Los valores de CCI oscilaron entre 0,643 y 0,874. Más de la mitad de las mediciones obtuvieron valores de CCI superiores a 0,81, lo que se consideró una reproducibilidad "casi perfecta", según la interpretación sugerida por Landis y Koch. Se obtuvo un promedio de las diferencias entre -0,2 a -0,4, con límites de acuerdo estrechos. Conclusiones: Se encontró una reproducibilidad "casi perfecta" y un promedio de las diferencias cercano a cero entre las medidas manuales y digitales(AU)

Introduction: The incorporation of digital models offers the orthodontist an alternative to the plaster study models that are commonly used. These are a standard component of orthodontic records and are critical to diagnosis and treatment planning. It is important to inquire about the reliability of new technologies. Objective: To evaluate the reproducibility of digital and manual measurements of dental alignment in initial models of orthodontic patients. Methods: A diagnostic technology evaluation study was carried out with 80 plaster models that were digitized with the Ineos X5 Scanner. Once the plaster models and digital images of them were obtained, the researcher who obtained the best result in the inter and intra examiner calibration performed the dental alignment measurement. Manual measurements were taken with a digital caliper, and digital ones were taken in the Nemocast software. The analysis included the calculation of the Intraclass Correlation Coefficient (ICC) and the Bland and Altman limits of agreement. A value of p <0.05 was considered statistically significant. Results: ICC values ​​ranged between 0.643 and 0.874, more than half of the measurements obtained ICC values ​​higher than 0.81, which was considered "almost perfect" reproducibility according to the interpretation suggested by Landis and Koch. Differences between -0.2 to -0.4 were averaged with narrow limits of agreement. Conclusions: An "almost perfect" reproducibility was found and an average of the differences close to zero between manual and digital measurements.

A novel method for isolation and culture of primary swine gastric epithelial cells.

BACKGROUND: Culturing primary epithelial cells has a major advantage over tumor-derived or immortalized cell lines as long as their functional phenotype and genetic makeup are mainly maintained. The swine model has shown to be helpful and reliable when used as a surrogate model for human diseases. Several porcine cell lines have been established based on a variety of tissues, which have shown to extensively contribute to the current understanding of several pathologies, especially cancer. However, protocols for the isolation and culture of swine gastric epithelial cells that preserve cell phenotype are rather limited. We aimed to develop a new method for establishing a primary epithelial cell culture from the fundic gland region of the pig stomach. RESULTS: Mechanical and enzymatic dissociation of gastric tissue was possible by combining collagenase type I and dispase II, protease inhibitors and antioxidants, which allowed the isolation of epithelial cells from the porcine fundic glands showing cell viability > 90% during the incubation period. Gastric epithelial cells cultured in RPMI 1640, DMEM-HG and DMEM/F12 media did not contribute enough to cell adhesion, cluster formation and cell proliferation. By contrast, William's E medium supplemented with growth factors supports confluency and proliferation of a pure epithelial cell monolayer after 10 days of incubation at 37 °C, 5% CO2. Mucin-producing cell phenotype of primary isolates was confirmed by PAS staining, MUC1 by immunohistochemistry, as well as the expression of MUC1 and MUC20 genes by RT-PCR and cDNA sequencing. Swine gastric epithelial cells also showed origin-specific markers such as cytokeratin cocktail (AE1/AE3) and cytokeratin 18 (CK-18) using immunohistochemical and immunofluorescence methods, respectively. CONCLUSIONS: A new method was successfully established for the isolation of primary gastric epithelial cells from the fundic gland zone through a swine model based on a combination of tissue-specific proteases, protease inhibitors and antioxidants after mechanical cell dissociation. The formulation of William's E medium with growth factors for epithelial cells contributes to cell adhesion and preserves functional primary cells phenotype, which is confirmed by mucin production and expression of typical epithelial markers over time.

The effect of orthodontic forces on calcitonin gene-related peptide expression in human dental pulp.

INTRODUCTION: The purpose of this study was to quantify the effect of moderate and severe orthodontic forces on calcitonin gene-related peptide (CGRP) expression in healthy human dental pulp. METHODS: Thirty human dental pulp samples were obtained from healthy premolars in which extraction was indicated for orthodontic reasons. Before extraction, teeth were divided into 3 groups of 10 premolars each: (1) the control group: healthy premolars without application of orthodontic forces; (2) the moderate force group: a 56-g force was applied to the premolars for 24 hours; and (3) the severe force group: a 224-g force was applied to the premolars for 24 hours. All dental pulp samples were processed, and CGRP was measured by radioimmunoassay. RESULTS: Greater CGRP expression was found in the severe force group followed by the moderate force group. The lower CGRP values were for the control group. The Kruskal-Wallis test showed statistically significant differences between groups (P < .0001). Least significant difference (LSD) post hoc tests showed statistically significant differences in CGRP expression between the control group and the severe force group (P < .0001) but not with the moderate force group (P = .06). Differences between the moderate and severe force groups were statistically significant (P < .0001). CONCLUSIONS: CGRP expression in human dental pulp increases when teeth are submitted to severe orthodontic forces.