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Dental Silicone
With Dental Impression Material, Every Impression – Not Just The First Impression – Is Important
How important is the choice of dental impression material to the success of a procedure? The best answer is actually three-fold. The quality of the finished dental prosthesis depends in great part upon how well it integrates with the features inside the patient's mouth, including the shape of the exposed periodontal surfaces and the remaining teeth. That integration, in turn, is completely dependent upon the quality of the impression itself, which is determined by both the skill of the technician making the impression and the dental impression materials being used. Where once dental impression materials included such things as plaster of Paris and agar-agar (the gooey gelatinous material used for growing cultures), these materials had some serious drawbacks. Plaster, for example, not only tasted terrible, it required that the patient's mouth be immobilized for an extended time while the plaster hardened, and the heat generated during the curing process was less than comfortable. Furthermore, it wasn't the best choice for flowing into minute crevasses in the patient's mouth, and had a tendency to adhere to any surface – tooth or gum – that wasn't thoroughly coated with a release agent such as oil or petroleum jelly. And while agar might be a wonderful nutrient, it simply isn't a pleasant material to have in one's mouth, and like plaster, tended to stick to the tooth surfaces.
The most common dental impression material in use nowadays is polyvinyl siloxane, or PVS. In addition to offering a quick curing time (which patients really appreciate), PVS exhibits very good "flowability" and dimensional stability once set, making for a very accurate and durable impression. It is also unaffected by most commonly-used disinfectant chemicals, which is reassuring to both clinician and patient, and certainly cannot be said about previously used materials like agar-agar and plaster of Paris.
There are some instances – and some clinicians' preferences – that dictate the use of other dental impression materials, such as condensation and addition-cured silicones, with the former best suited for casting epoxies and other low-temperature molding agents, and the latter exhibiting virtually no shrinking or distortion during the curing process, and being better suited for casting low-melting-point metals. While not quite as convenient as the PVS impression materials, silicone materials do have advantages that render them desirable in some cases. Most dental practices will maintain a stock of several types of impression materials in order to best respond to any patient's dental impression needs.
About the Author
While dental impression material might not be very high on most people's list of concerns, it is an unfortunate fact of life that most people will suffer from tooth decay at some point in their lives, often to the extent that one or more teeth are severely damaged or lost. When that happens, prosthetic replacement or reconstruction of the tooth (or teeth) is typically indicated. And patients aren't expected to think about the materials used to correct their problem; that is the job of the dentist and the technician responsible for purchasing dental supply. The experienced professionals at Med101Dental.com are here to make that job easier.
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