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Literature review of tactics to enhance impression management
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Impression formation theory
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Group 2 (Filippini JL, Floumanhaft MJ, Fluger KR, Fuller AD, Gilbert MK, Gliwa CL): What is the effect of the disinfection materials on PVS and polyether impression materials? Poly (vinyl siloxane) (PVS), also known as addition silicone, has the greatest dimensional stability of any of the impression materials, but is hydrophobic. Some PVS formulations that contain surfactants to give them hydrophilic properties will result in enhanced wettability causing them to expand when in contact with moisture. Polyether (PE) has the second best dimensional stability of all of the impression materials and is inherently hydrophilic.6 In an article from 1988, Johnson et al warns that PE is particularly sensitive to immersion disinfection.4 More recent studies conducted by Adabo et al. (1999) and Melilli et al. (2008) indicate that PVS and PE have intrinsically different reproduction accuracy and that differences in dimension caused by immersion disinfection procedures are not clinically relevant.1,5 In a study of current impression materials including Aquasil Ultra Monophase® and Impregum Penta...
Fire and thermal properties of PA 66 resin treated with poly-N- aniline- phenyl phosphamide as a flame retardant
In this work, the mechanical and barrier properties were examined for Polypropylene (PP) film in which the surface of the film was modified by Oxygen plasma treatment. The PP film was treated in various intervals of time of 60 s, 120 s, 180 s, 240 s and 300 s with three various RF power settings of 7.2 W, 10.2 W, 29.6 W. The contact angle was measured to characterize the wettability. The oxygen functional groups were generated on the surface of oxygen modified PP which was observed by Fourier transform infrared spectroscope and it was resulted in the improvement of wettability. The surface morphology and roughness of the PP films before and after the oxygen plasma treatment was analyzed by Atomic Force Microscopy (AFM). It was found that the roughness of
Because of its ability to break down self-associative tendency of water , it may also reduce the number of water molecules entrapped between the polymeric chains, increasing the degree of postoperative polymerization In addition to post-curing increase in bond strength, the relative decrease in free water would eliminate or decrease the hydrolytic degradation of adhesive in or above the hybrid layer
Today, polyvinyl chloride (PVC) is used in many different products across the world. According to the APHA (2011), the material can be found in toys, medical supplies, floors, and even food wrapping. (p. 1) I believe that this material has made it possible for a lot of products to be made that have benefited the human population, but I believe there are many drawbacks to using this material.
Dental sealants are a thin film that is used to coat the pits and fissures on your teeth. These areas are more susceptible to cavities because food can easily get stuck in these grooves. The film is not typically applied to smooth surfaces on your teeth. Dental sealants are ideal for children because they help to protect your child’s teeth from tooth decay at a young age. However, dental sealants do not last forever. They need to be taken care of in order to prevent premature chipping and breaking. Luckily, there are a few tips that you can use to prevent your child’s dental sealant from chipping.
Dental composites, also known as "white fillings", are a group of restorative materials composed of a mixture of powdered glass and plastic resin regularly used in modern dentistry to resemble the appearance of the natural tooth. Acrylic resin was first introduced to the dental profession in the mid 1950s. Since their introduction, acrylic based materials have continued to play a pivotal role in restorative and prosthetic dentistry. After the introduction of the bisphenol A glycidyl methacrylate, or BIS-GMA, by Bowen in the early 1960s the potential application of resins has emerged. This composition and formulation possessed a higher molecular weight and therefore better mechanical properties and reduced polymerization shrinkage, the newer polymer offered potential for much greater applications that included anterior and posterior composite resin restorations, indirect inlays/onlays, pit and fissure sealants and more wear resistant denture teeth.
Feces, viruses, staph, Salmonella and hand-foot-mouth disease. These are just a few of the things that can be on our hands from normal daily living. With compromised immune systems, open wounds and other issues, these are very harmful. That is why it is so important to keep proper hand hygiene in mind at all times. Hospital infections affect almost two million people in the United States every year, 100,000 of whom die. Up to 70 percent of infections could be prevented if the health care workers follow recommended protocol (Michigan Health Lab, May 26, 2016). Nobody wants to know that when your food has
National Center for Manufacturing Sciences. (2004, August 11). Environmental Roadmapping Initiative. Retrieved October 14, 2011, from Plastics Impacts, Risks and Regulations: http://ecm.ncms.org/ERI/new/IRRPlastics.htm
Denture teeth can be made of acrylic poly(methyl methacrylate) (PMMA) or composite resins. PMMA is a polymer - a material made the from joining of methyl methacrylate monomers. Properties of PMMA include resistance to abrasion, chemical stability and a high boiling point. (Jun Shen et al. 2011). However, weak flexure and impact strength of PMMA are of concern as they account for denture failure. (Bolayir G, Boztug A and Soygun K. 2013). Composite denture teeth are made of a three distinct phases - filler, matrix and coupling agents. Out of the types of composite teeth available, nano-filled composite teeth are preferred. Composite teeth have a PMMA coating around the tooth and a high content of filler particles. This gives them strength, higher resistance to forces than acrylic teeth and provides compete polymerization due to the PMMA coating. (Anusavice, K. J., Phillips, R. W., Shen, C., & Rawls, H. R, 2012). If the interface between the PMMA denture base and PMMA or composite teeth was weak, the denture will not be able to sustain occlusal forces, making the base-teeth interface, an entity of significance.
Polyethylene (PE) is one of the most commonly used polymers which can be identified into two plastic identification codes: 2 for high-density polyethylene (HDPE) and 4 for low density polyethylene (LDPE). Polyethylene is sometimes called polyethene or polythene and is produced by an addition polymerisation reaction. The chemical formula for polyethylene is –(CH2-CH2)n– for both HDPE and LDPE. The formation of the polyethylene chain is created with the monomer ethylene (CH2=CH2).
"The History of Plant Incidents at Formosa Plastics and Past Safety Violations." Industrial Injury Attorneys. http://www.industrialinjuryattorney.com/Industrial-Accident-Blog/2013/May/The-History-of-Plant-Incidents-at-Formosa-Plasti.aspx (accessed April 3, 2014).
Molinari, J., & Hart, J. (2010). How to Choose and Use Environmental Surface Disinfectants. Cottone's Practical Infection Control in Dentistry (Third Edition ed., pp. 185- 193). Philadelphia: Wolters Kumar Lippincott Williams & Wilkins.
I chose to do the effects of different disinfectants on bacteria because I have always wondered if disinfectants such as Clorox, Lysol, and hand sanitizer actually kill 99.9 percent of germs. Also, I know that there are harsh chemicals that can be damaging to us over time. Do these harsh chemicals get the job done? Maybe taking a green, organic way could be the solution in the future. My main question is which is the better disinfectant, Clorox Disinfecting Wipes or Lysol Disinfecting Wipes. I want to uncover the truth about each product and show the reality of both. Are they really getting the job done?
There are numerous factors which can affect dimensions of subsequent casts on repetitive pouring. These include the process of polymerization (7), temperature (1), and material used to fabricate the replica or working cast (1). Although, PVS impression materials have demonstrated superior dimensional stability when compared with other elastomeric materials due to no releasing any by-products (8), it had been reported that the dimensional accuracy of a material is time dependent. A material may be highly dimensionally accurate soon after its initial polymerization but less accurate after the storage for a period of time (9). On the other hand, PVS impression materials have chosen as the impression material in many clinical situations because they possess excellent physical properties and handling characteristics
9. Siso HS, Kustarci A, Göktolga EG. Microleakage in Resin Composite Restorations After Antimicrobial Pre-treatments: Effect of KTP Laser, Chlorhexidine Gluconate and Clearfil Protect Bond. Oper Dent. 2009; 34(3): 321-327.