ABSTRACT
OBJECTIVE: The purpose of this in vitro study was to compare the marginal and internal fit of pressed lithium disilicate veneers fabricated from a 3D printed castable wax resin versus a manual waxing technique. MATERIALS AND METHODS: A typodont model central incisor was prepared for a porcelain veneer. Following stone model fabrication from a polyvinyl siloxane impression, the model was digitized using a laboratory scanner. Group 1 veneers were designed digitally and 3D printed with a castable wax resin, then pressed. Group 2 veneers were fabricated using a manual wax and press approach. Veneers from both groups were bonded to printed dies. Following measurements of marginal adaptation under a stereo microscope, the dies were sectioned and measurements were made for internal adaption. Statistical analysis included a Kolmogorov test and a Mann-Whitney U test. RESULTS: Average marginal gap (µm) for Group 1 was 40.37 ± 11.75 and 50.63 ± 16.99 for Group 2 (p = 0.51). Average internal gap (µm) for Group 1 was 61.21 ± 18.20 and 68.03 ± 14.07 for Group 2 (p = 0.178). CONCLUSION: There was no difference in marginal fit or internal fit between pressed lithium disilicate veneers fabricated with a 3D printed castable resin and those fabricated with a manual waxing technique. The use of digital technologies and 3D printing provide significant advantages in the fabrication of pressed glass ceramic veneers, with marginal and internal adaptation comparable to manual wax and press techniques.
Subject(s)
Dental Marginal Adaptation , Dental Porcelain , Ceramics , Computer-Aided Design , Crowns , Dental Impression Technique , Dental Prosthesis Design/methods , Printing, Three-DimensionalABSTRACT
Objetivo Construir y analizar las propiedades psicométricas de un cuestionario que evalúa las conductas de salud que hacen parte del estilo de vida de los universitarios. Métodos Se realizó un estudio de validación con dos fases. La primera con 1485 estudiantes (63,2 por ciento mujeres), de cuatro universidades de Colombia, cuya edad media fue de 20,7 años (DT=2,5). La segunda con 1811 estudiantes (55,8 por ciento mujeres) de seis universidades del paÃs, con una edad media de 19,7 (DT=2,0). Se hicieron análisis para la validez de contenido, análisis de discriminación de Ãtems, análisis factoriales y de consistencia interna. Resultados La versión final del "Cuestionario de estilos de vida de jóvenes universitarios" [CEVJU-R] quedó constituida por 40 Ãtems que evalúan conductas en ocho dimensiones del estilo de vida: Actividad fÃsica, Tiempo de ocio, Alimentación, Consumo de alcohol, cigarrillo y drogas ilegales, Sueño, Habilidades interpersonales, Afrontamiento y Estado emocional percibido. Adicionalmente, incluyó 28 Ãtems que evalúan, en siete de las ocho dimensiones, las motivaciones para llevar a cabo o no las prácticas y para cambiarlas, asà como los recursos que facilitan o dificultan su realización. El nivel de fiabilidad de las dimensiones fue de aceptable a moderado (entre 0,6 y 0,7). Conclusiones El CEVJU-R presenta propiedades psicométricas adecuadas y constituye un avance en la medición de los estilos de vida de los universitarios. PodrÃa utilizarse para la identificación de las necesidades de los jóvenes y para la definición de las acciones de promoción y prevención dentro de las universidades.
Objective Constructing a questionnaire for assessing university students' behaviour regarding health forming part of their life-styles and evaluating its psychometric properties. Methods A two-phases validation study was conducted; the first covered 1,485 students (63.2 percent female) from four Colombian universities having a mean age of 20.65 years (SD=2.5) and the second covered 1,811 students (55.8 percent female) from six universities having a mean age of 19.65 years (SD=2.0). A content validity analysis, an item discrimination analysis, a factorial analysis and reliability assessment were done. Results The final version of the university students' life-style questionnaire [CEVJU-R, by its Spanish's abbreviations] finally consisted of 40 items related to health and life-style regarding eight factors: physical activity, leisure time, eating habits, alcohol, cigarette and drug use, sleep, interpersonal abilities, coping and perceived emotional state. It also included 28 items evaluating motivation (whether to engage in certain practices regarding health and whether to change them) and the availability of resources facilitating or interfering with such behaviour in seven out of the eight dimensions. Factor reliability level was acceptable (ranging from 0.6 to 0.7). Conclusions The CEVJU-R had suitable psychometric properties and constituted an advance in measuring university students' life-styles and could help identify health need and focus health promotion and prevention strategies in this population.
Subject(s)
Adult , Humans , Young Adult , Health Behavior , Surveys and Questionnaires , Students/psychology , Universities , Alcohol Drinking/epidemiology , Emotions , Habits , Interpersonal Relations , Life Style , Motivation , Motor Activity , Reproducibility of Results , Smoking/epidemiologyABSTRACT
OBJECTIVE: Constructing a questionnaire for assessing university students' behaviour regarding health forming part of their life-styles and evaluating its psychometric properties. METHODS: A two-phases validation study was conducted; the first covered 1,485 students (63.2 % female) from four Colombian universities having a mean age of 20.65 years (SD=2.5) and the second covered 1,811 students (55.8 % female) from six universities having a mean age of 19.65 years (SD=2.0). A content validity analysis, an item discrimination analysis, a factorial analysis and reliability assessment were done. RESULTS: The final version of the university students' life-style questionnaire [CEVJU-R, by its Spanish's abbreviations] finally consisted of 40 items related to health and life-style regarding eight factors: physical activity, leisure time, eating habits, alcohol, cigarette and drug use, sleep, interpersonal abilities, coping and perceived emotional state. It also included 28 items evaluating motivation (whether to engage in certain practices regarding health and whether to change them) and the availability of resources facilitating or interfering with such behaviour in seven out of the eight dimensions. Factor reliability level was acceptable (ranging from 0.6 to 0.7). CONCLUSIONS: The CEVJU-R had suitable psychometric properties and constituted an advance in measuring university students' life-styles and could help identify health need and focus health promotion and prevention strategies in this population.
