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Dental Materials

What is the preferred technique for taking an impression for a cast post & core?

In this short video (2:36), Dr. Bob Loney, Professor and Chair of the Dental Clinical Sciences Department at the Faculty of Dentistry, Dalhousie University, demonstrates a technique that provides a bubble-free impression that won’t distort. Paint the impression tray with adhesive. Pack and remove retraction cord. Inject light-body polyvinyl siloxane impression material all around the completed crown preparation. ensuring to capture the crown margins. Squeeze some light-body material on to a pad and coat it over the length of a lentulo spiral filler on a contra-angle slow speed handpiece. Place the coated lentulo spiral filler down the canal where its ...

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Light Curing: So Easy, So Dangerous!

In these videos, Dr. Richard Price, Professor and Head of Fixed Prosthodontics in the Department of Dental Clinical Sciences at Dalhousie University’s Faculty of Dentistry, shares excellent clinical information related to light curing. The video has been divided into short theme section as follows:  Light curing so easy, so dangerous! Complete video (27 minutes) The perfect storm The success of 122+ million restorations and 16+ million sealants placed annually depends on the curing lights and how it is used. Do we have any evidence that resin restorations are not lasting as long as they could and should?  Various curing modes and irradience We ...

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Are there any tooth-coloured materials that are free of BPA and estrogen-mimicking agents?

This question was submitted by a general dentist: My patient requests that her tooth-coloured restorations be free of BPA and estrogen-mimicking agents. Can you suggest any tooth-coloured materials and cements that meet those criteria? Dr. Omar El-Mowafy, Professor and Head of the Restorative Dentistry at the University of Toronto, provided this quick initial response: Bisphenol A (BPA) is an organic compound with the chemical formula (CH3)2C(C6H4OH)2.  It is widely used in the industry when making plastic products. Tooth-colored restorations that are Bisphenol-A-free would automatically exclude almost all resin composite restoratives and their corresponding bonding agents. Therefore, in this case the ...

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