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Dental Materials

Opening the Conversation: What are the advantages and disadvantages of full-contour zirconia vs. cast gold for a full crown on a second molar?

This question was submitted by a general dentist: What are the advantages and disadvantages of full-contour zirconia vs. cast gold for a full crown on a second molar? The following are “discussion-opener” responses by:  Dr. Karen Black I have been using full-coverage zirconia crowns in low-aesthetic-need zones for patients who want a tooth-colored restoration. I like the fact that I can do my basic gold crown prep and keep it more conservative than a PFM or (e.g.) Emax crown. However, other than the fact that it is tooth-colored, the only additional advantage is price. The lab fee is far lower than ...

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What is the latest thinking on composite resin materials & adhesion?

A JCDA editorial consultant sent me a link yesterday to an article in the latest edition of the Inside Dentistry publication, titled Current Thinking on Composites and Adhesion. My respected colleague advised me to read this article and consider sharing it with you. Clinicians, researchers and industry-based scientists provide responses to the following questions. Is the new generation of bonding systems significantly better or just easier to use? What are the clinical indications for the use of glass ionomers, and what liners, if any, should be used with composites? Do low-stress composite materials provide a true clinical benefit? Prior to ...

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How safe, clinically effective, and cost-effective are composite resin and amalgam dental filling materials?

We are very pleased to present the first Canadian Armed Forces Dental Corps’ post, by Lieutenant-Colonel Dr. Dwayne Lemon, Senior Clinical Practice Leader  Last year, as part of its continuous quality improvement program, the Canadian Armed Forces Dental Corps initiated an evaluation of its restorative practice, particularly its choice of direct restorative materials for treating caries. The Dental Corps asked the Canadian Agency for Drugs and Technologies in Health (CADTH) to critically appraise the existing literature on the suitability of amalgam- and resin-based composite as restorative materials. The resulting report Composite Resin and Amalgam Dental Filling Materials: A Review of ...

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What are the effects of chlorhexidine in self-etching adhesive?

This summary is adapted from the article published in the Dental Materials Journal: Effects of chlorhexidine in self-etching adhesive: 24 hours results Full-text Article (PDF) Purpose of the study Compare the micro-tensile bond strengths (MTBS) and the FT-IR (Fourier Transform Infrared Spectroscopy) percent conversion of an all-in-one self-etching adhesives contained varying concentration of CHX. Results The addition of up to 1% CHX in AQ Bond Plus adhesive produced good MTBS and PC. Chlorhexidine treatment of dentin has been shown to reduce the collagenolytic activity of dentin. It seems that applying CHX during the bonding procedure is effective at reducing the degradation of ...

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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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