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Comparative color stability assessment of orthodontic clear aligners: an in vitro study.
Sci Rep
January 2025
Dental Students, College of Medicine and Dentistry, Riyadh Elm University, Riyadh, KSA, Saudi Arabia.
Objective To evaluate the stain resistance and color stability of four Clear aligners (CA) brands against various beverages at different intervals, along with assessing the elaboration of cleaning agents. Methods In a strictly controlled lab environment, 48 CAs from four different companies (Invisalign, EON, Clear Cap, and K clear) were immersed for seven days in six different beverages based on their pH (Pepsi, orange juice, milk, coffee, and black tea), as well as a control solution (distilled water). The VITA Easy-Shade compact colorimeter used the Commission International lightening L*a*b* color scheme to evaluate the color change of the aligners at four intervals.
View Article and Find Full Text PDFGuided-VCTE: An Enhanced FibroScan Examination With Improved Guidance and Applicability.
Ultrasound Med Biol
January 2025
Echosens, Paris, France.
Objective: Although FibroScan (FS), based on Vibration-Controlled Transient Elastography (VCTE), is a widely used non-invasive device for assessing liver fibrosis and steatosis, its current standard-VCTE examination remains timely and difficult on patients with obesity. The Guided-VCTE examination uses continuous shear waves to locate the liver by providing a real-time predictive indicator for shear wave propagation and uses shear wave maps averaging to increase the signal-to-noise ratio in difficult to assess patients. We aimed to evaluate the effectiveness of the new indicator, as well as compare examination times and success rates with both standard-VCTE and Guided-VCTE examinations.
View Article and Find Full Text PDFPulmonary hypertension in patients with chronic obstructive pulmonary disease: Impact of lung hyperinflation on the response to pulmonary hypertension treatment.
Respir Med Res
December 2024
Département de Pneumologie, CHRU Nancy, Vandoeuvre-Lès Nancy, France; INSERM U1254 IADI, Université de Lorraine, Nancy, France. Electronic address:
Background: Pulmonary hypertension (PH) is common during chronic obstructive pulmonary disease (COPD), particularly in patients with severe COPD. These patients can be classified into different PH groups due to frequent comorbidities. Emphysema is often associated with COPD and is responsible for lung hyperinflation, which may contribute to the development of PH.
View Article and Find Full Text PDFThe effect of tumor downsizing on surgical complexity during nephrectomy after immune checkpoint inhibitors for metastatic renal cell carcinoma.
World J Urol
January 2025
Department of Medical Oncology, Institut de Cancérologie Strasbourg Europe (ICANS), Strasbourg, France.
Purpose: Immune Checkpoints Inhibitors (ICI) have changed the therapeutic landscape of metastatic renal cell carcinoma first-line treatment with complete response (CR) at metastatic sites observed in 10 to 15% of cases. Delayed nephrectomy could be discussed for patients having a clinical benefit from immunotherapy-based treatment. However, it is unclear whether prior immunotherapy exposure adversely influences the complexity of surgery.
View Article and Find Full Text PDFEffects of aging on the tensile strength and surface condition of orthodontic aligners: a comparative study of five models.
Eur J Orthod
December 2024
Department of Orthodontics, University of Lorraine, Nancy, France.
Background/objective: The objective of this study is to determine the effect of aging on tensile strength and surface condition of orthodontic aligners on days 0, 1, 5, 7, 10, and 14.
Materials/methods: The total sample of 80 aligners included five brands (Accusmile®, Angel®, GRAPHY®, Invisalign® and Suresmile®) were placed in a thermocycler to imitate the temperature variations of the oral cavity and accelerate aging for 50, 250, 350, 500, and 700 cycles. The mechanical tensile properties (Young's modulus E, yield strength YS, maximum elastic stress MES, Ultimate Tensile Strength UTS, and maximum stress MS) were measured by Universal Testing Machine at a rate of 5 mm of deformation per minute for 4 minutes.
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