J Prosthet Dent
School of Dental and Oral Surgery, Columbia University, New York, NY, USA.
Published: January 2001
Statement Of Problem: Casting relief is required for proper seating of castings to allow for luting agent thickness. The application of die spacer to the die is the most common method of obtaining casting relief. Die spacer film thicknesses that are outside the ideal range of 25 to 40 microm can cause clinical problems. Thickness can be affected by the separation of die spacer constituents, which may not be reconstituted by mixing, in the bottle and by the evaporation of volatile components while the bottle is open.
Purpose: The purpose of this study was to determine the effects of component evaporation and die spacer mixing technique on applied die spacer thickness.
Material And Methods: Bottles of Gold Tru-fit die spacer were left open for 0, 1, 4, 8, and 24 hours at 22 degrees C. Spacer solutions were shaken either by hand per the manufacturer's directions or on a dental vibrator for 1 minute. One even brush stroke of spacer was applied to clean glass slides. Three die spacer films were made for each combination of time and mixing technique. Eighteen thickness measurements per sample at various sites were recorded with profilometer tracings. Statistical differences were determined with a 2-way ANOVA.
Results: Handshaking provided greater die spacer thickness, which increased with the time that the bottle was open. Vibration provided lower thickness with no statistical increase with time.
Conclusion: Insufficient agitation caused lower film thickness. Excessive evaporation caused higher film thickness.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1067/mpr.2001.113028 | DOI Listing |
Ecohealth
January 2025
Guangxi Key Laboratory for Forest Ecology and Conservation, College of Forestry, Guangxi University, Nanning, Guangxi, 530000, People's Republic of China.
Chytridiomycosis is a wildlife disease that has caused significant declines in amphibian populations and species extinctions worldwide. Asia, where the causal pathogens Batrachochytrium dendrobatidis (Bd) and B. salamndrivorans (Bsal) originated, has not witnessed mass die-offs.
View Article and Find Full Text PDFACS Nano
January 2025
Department of Physics of Information in Matter and Center for Nanophotonics, NWO-I Institute AMOLF, Science Park 104, NL 1098XG Amsterdam, The Netherlands.
Phosphor-converted micro-light emitting diodes (micro-LEDs) are a crucial technology for display applications but face significant challenges in light extraction because of the high refractive index of the blue pump die chip. In this study, we design and experimentally demonstrate a nanophotonic approach that overcomes this issue, achieving up to a 3-fold increase in light extraction efficiency. Our approach involves engineering the local density of optical states (LDOS) to generate quasi-guided modes within the phosphor layer by strategically inserting a thin low-index spacer in combination with a metasurface for mode extraction.
View Article and Find Full Text PDFJ Arthroplasty
October 2024
Department of Orthopaedic Surgery, Keck Medical Center of the University of Southern California, Los Angeles, California.
Background: Privatized Medicare Advantage (MA) plans are an alternative to traditional Medicare (TM). We sought to identify differences in 90-day postoperative mortality and nonfatal adverse events between TM and MA patients undergoing stage 1 antibiotic spacer placement for periprosthetic joint infection (PJI) of the hip or knee.
Methods: A nationally representative database was queried from 2015 to 2021 for adult patients undergoing stage 1 antibiotic spacer placement for PJI.
Plant Dis
August 2024
Agricultural Environment and Resource Research Institute, Yunnan Academy of Agricultural Sciences, Kunming,Yunnan, Kunming, China, 650205;
Plant Dis
July 2024
Central Agricultural University, College of Horticulture and Forestry, Pasighat, Arunachal Pradesh, India;
Khasi mandarin (Citrus reticulata Blanco) is the most economically important crop among the citrus growing region in the north-eastern India (Singh et al. 2016). An extensive survey was conducted to identify the causal agent of citrus root rot and gummosis in north eastern states (Meghalaya, Tripura, Manipur, Arunachal Pradesh, Sikkim, Nagaland and Assam) of India during October 2021-23.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!
© LitMetric 2025. All rights reserved.