18 However, the ability of impression materials to make duplicate dies with successive accuracy has not been investigated widely. 10, 16, 17 It seems that the best approach to make a duplicate cast is to make a second impression. If an impression material characterizes printing an accurate and precise details of the surface, all provided duplicated dies could have well marginal adaptation with the master die. In some circumstances, such as fracture or crack in margins of a die, clinicians are obligated to provide repetitive impressions and duplicated dies to improve marginal adaptation. Some other studies about these impression materials have been done recently 13- 15, but debates about the accuracy of these impressions still remain. They stated that dimensional accuracy of new PE was comparable to conventional PE impression material after short-term storage. surveyed the dimensional accuracy of stone dies provided from standardized impressions with polyvinylsiloxanes (PVS), new PE (P2), and conventional PE (Impergum) impression materials. They found greater accuracy and stability with AS materials. They used three types of alginates, five commercial silicones, and two experimental silicones impression materials. evaluated the effective factors on impressions accuracy during different storage times and proportion of inorganic fillers. Their results showed low dimensional changes during pouring and repetition for all of the impression materials. conducted a study to evaluate four types of impression materials (CS, AS, PS, and PE), based on different model location, repetition, and time of pouring. They can maintain their accuracy even 1-week or later, however, they are technique sensitive for instance PE should be stored in <50% humidity. PE and silicones are accurate with high stability. Several elastic impression material silicones are available for dental use: Synthetic elastomeric materials (polysulfide, additional silicone and condensational silicone, and polyether ) and hydrocolloids. There are several factors which can affect the accuracy of definitive impression like: Quality of preparation (undercuts and tapering), impression technique, soft tissue management, and quality of wax pattern and casting. Marginal adaptation of a cast restoration can influence its durability due to: Lower accumulation of plaques in margins, enhancing structural properties (stability, resistance, low thickness of cement, and etc.), and higher esthetics. Furthermore, temporary restorations are essential for preservation of the tooth structure in the meantime of preparing cast models. Please remember it can take some time for your bank or credit card company to process and post the refund too.Achieving optimum function and esthetic of restorations is very important, especially in replacing a missing tooth. If approved, you’ll be automatically refunded on your original payment method. We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item. Unfortunately, we cannot accept returns on sale items or gift cards. Please get in touch if you have questions or concerns about your specific item. We also do not accept returns for hazardous materials, flammable liquids, or gases. Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.Ĭertain types of items cannot be returned, like perishable goods (such as food, flowers, or plants), custom products (such as special orders or personalized items), and personal care goods (such as beauty products). You can always contact us for any return question at and issues Items sent back to us without first requesting a return will not be accepted. To start a return, you can contact us at If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Special orders and non-stock merchandise not held within our regular inventory but ordered at your request are not returnable. It is the customer's responsibility for shipping costs or returned items. 20% re-stocking fee applies for items returned. All returned product items must be in good re-saleable condition. All damaged or shortage items must be reported and authorized for return within 48 hours of receipt.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |