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Fast Setting Dental Impression Putty

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This cookie is set by the provider SnapEngage for the live chat functionality. This cookie is used for sending alias to chat agent and update the chat case. Monophase materials are limited in their clinical application. An ideal material must be resilient enough to be withdrawn from the mouth easily, particularly when mobile teeth or prepared teeth are thin. The material must also be flexible enough to be removed from the model without breaking off a thin preparation. This has ledto the development of the “soft” formulas of polyethers. However, any material when used in a sideless, dual-arch tray must be firm enough to support the weight of the gypsum when the model is poured, without sagging under the weight of the stone. It appears that one viscosity of material would not be able to ideally fulfill all of these parameters simultaneously.

This article will attempt to clarify some of the areas of confusion regarding impression materials and techniques.

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Brosky ME, Pesun IJ, Lowder PD, et al. Laser digitization of casts to determine the effect of tray selection and cast formation technique on accuracy. J Prosthet Dent. 2002;87:204-209. Certain materials require more reduction than others. This is due to physical or optical properties.Use a putty matrix of the ideal tooth shape and position (ideally from a wax-up) as a guide to keep you aware of what you are aiming for. Prepare from crown down Profeta AC, Prucher GM. Bioactive-glass in periodontal surgery and implant dentistry. Dent Mater J. 2015;34(5):559-571. doi: 10.4012/dmj.2014-233 Comparative evaluation of bioactive synthetic novabone putty and calcified algae-derived porous hydroxyapatite bone grafts for the treatment of intrabony defects. Bembi NN, Bembi, S, Mago J, Baweja GK, Baweja PS. Int. J of Clin Pediatric Dent Oct-Dec 2016; 9(4):285-290. Hung S H et al. Accuracy of one-step versus two-step putty wash addition silicone impression technique. J Prosthet Dent 1992; 67: 583–589. A-type silicones – also known as VPS impression materials – are hydrophobic (i.e. water-resistant). By the addition of surfactants (wetting agents), it is possible to increase the material’s hydrophilicity even in the unset state. In addition, there are great variations of the flow behavior during the working time offered by different materials with a flow reduction seen especially towards the end of the working time. General advantages of VPS are their superior elastic recovery, high dimensional stability over time, and neutral taste.

A simplified approach to the minimally invasive antral membrane elevation technique utilizing a viscoelastic medium for hydraulic sinus floor elevation. Kotsakis GA, Mazor Z. Oral Maxillofac Surg. 2015; 19(1): 97-101. Dentists can use a number of different techniques that employ a variety of different materials and viscosities to take impressions. Traditionally, a heavy-body tray material is utilized with a lighter body wash material that is syringed around the tooth just before the tray is seated. Since the 1980s, with the introduction of vinyl putties, several putty/wash techniques have been advocated. Various innovations of these techniques have emerged, further confusing the clinician. Although it is possible to get many different techniques to work, the final choice as to technique should center on which is least problematic and most likely to produce consistent results. In the process of impression preparation, the surgeon should fully reflect the love-intention consciousness, try to eliminate the patient's nervousness, gentle movement, correct posture, avoid irritating the pharynx and cause nausea, avoid tray compression, damage the oral tissue, and ensure patient comfort and impression quality. Over the past 10 years I have worked hard to become comfortable with preparing teeth for crowns. In this month’s column I will share with you some of my prosthodontips to get the perfect crown preparation every time Effect of Addition of platelet-rich plasma to calcium phosphosilicate putty on healing at 9 months in periodontal intrabony defects. Shukla S, Chug, A, Mahesh L, Grover, HS, The J of Contemp Dent Prac Mar 2016; 17(3):230-234.Impression materials are introduced into the mouth as viscous pastes with precisely adjusted flow properties. The viscosity and flow behavior of the unmixed components are also important in regard to the ease of mixing, air entrapment during mixing, and the tendency for the trapped air to escape before the impression is made. A clinical and radiographic case series of implants placed with the simplified minimally invasive antral membrane elevation technique in the posterior maxilla. Kher U, Ioannou AL, Kumar T, Siormpas K, Mitsias ME, Mazor Z, Kotsakis GA. J Craniomaxillofac Surg. Dec 2014; 42(8): 1942-7. Ideally, the impression material should flow freely and wet the tissue as it is being injected to achieve adaptation, and then resist flow away from the intended surface areas. The same procedure will facilitate spreading of heavy-body material on the impression tray and retain it in the tray. This phenomenon is called shear thinning ( Chapter 3). Essentially, a stress-thinning material becomes less viscous when stressed as during injection and then recovers its viscosity when it rests on the tissue or or in the tray. All elastomeric impression materials exhibit shear-thinning characteristics before setting. Generally, there aren’t any major risks associated with dental impressions. But some people have a gag reflex that’s triggered by the dental impression procedure. In these cases, your dentist can work with you to minimize discomfort. Figure 7. Two-dimensional representation of polymerization shrinkage that occurs toward a rigid wall and to the center of its mass when no rigid wall is present.

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