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Dental Materials

Is there clinical evidence for successful bonding of dental oxide ceramic restorations?

This summary is based on the article published in Dental Materials: Bonding to oxide ceramics—Laboratory testing versus clinical outcome (January 2015) Matthias Kern Context A large number of articles dealing with bonding to zirconia and other oxide ceramics suggests that bonding to these ceramics would be an unsolved problem in dentistry. Most original laboratory research reports on bonding to zirconia ceramics start in their introduction with a statement pointing more or less out that achieving a reliable and predictable bond to this ceramic would be a major problem in dentistry or at least a limitation when restorations with limited or no ...

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Can a patient react against composite resin fillings when diagnosed with a contact allergy to epoxy?

This post is based on a Q&A published on the Nordic Institute of Dental Materials website Can a patient react against composite resin fillings when he or she has been diagnosed with a contact allergy to epoxy? Should existing composite fillings be removed, and placement of new fillings avoided? Could resin-based luting cements pose a risk of allergy?   The potential cross-reaction between BIS-GMA − a commonly used constituent of many composite resins − has been a matter of concern. However, an association has not been established. BIS-GMA has chemical similarities with epoxy, but contains an acrylic moiety, which is ...

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Which technique(s) should we use to fill a Class II proximal box? Is there a difference in the long term margin integrity?

This question was submitted by a general dentist: I always worry that the cavosurface margins of class II preps are not fully filled when using composite resin. Is there a difference in the long-term margin integrity using the following 3 methods? Pack composite resin into the proximal box using an amalgam condenser. Place flowable resin along all cavosurface margins of the proximal box and cure it prior to packing composite. Place flowable resin on the cavosurface margins and then insert composite on top of the uncured flowable. Dr. John Burgess and Dr Suham Alexander provided this initial response.  Dr. John ...

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What is the impact of the Minamata Convention on Mercury on dentistry?

Context In February 2009, the Governing Council of the United Nations Environmental Programme (UNEP) agreed on the need to develop a global legally binding instrument, or treaty, on mercury. It tasked governments to negotiate through an Intergovernmental Negotiating Committee (INC) on Mercury, which met five times beginning in June 2010 and concluding in January 2013. The resulting international instrument is called the Minamata Convention on Mercury. Opened for signature in October 2013, it provides controls and reductions across a range of products, processes and industries where mercury is used, released or emitted. The Convention’s provisions for dental amalgam—a mercury-added product containing 50% mercury—make ...

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FACT OR FOLLY? All light curing units are created equally. Summary of the Dalhousie University’s First Conference on Light Curing

The conferences on Light Sources in Dentistry held at Dalhousie University, Halifax, NS bring world experts from academia and industry together to discuss ideas, advances and issues related to resin-based composite materials and light sources used in dentistry.  The 2nd Halifax Conference took place this past spring and information from this meeting has now been published. (Consensus statement from May Light Sources Meeting published in Journal of Adhesive Dentistry Vol. 16, No 4, 2014: Light Curing – Guidelines for Practitioners)  Short summaries of the topics covered at the 1st Halifax Conference (held in October 2012) along with links to the YouTube ...

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Exploring bonding effectiveness to zirconia ceramics

This summary is based on the article published in the Journal of Dental Research: Meta-analysis of Bonding Effectiveness to Zirconia Ceramics (April 2014) M. Inokoshi, J. De Munck, S. Minakuchi, and B. Van Meerbeek       Context Dental zirconia can no longer be considered unbondable to tooth tissue. Different mechanical and chemical surface pre-treatments have been recommended to improve the bonding of composite cement to zirconia. In today’s literature, multiple papers can be found reporting on bond strength measurements to zirconia; a large range of different pre-treatment methods has been tried out to ameliorate the bonding effectiveness to zirconia ...

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Which methods for polishing glass ceramics show better performance? A literature review

This summary is based on the article published in the Journal of Prosthodontic Research: Polishing for glass ceramics: Which protocol? (July 2014)           Taˆ nia Mara da Silva DDS, MD student Ana Carolina Rodrigues Danzi Salvia DDS, MD Rodrigo Furtado de Carvalho DDS, MD Clovis Pagani DDS, MD, PhD Daniel Maranha da Rocha DDS, MD, PhD Eduardo Galera da Silva DDS, MD, PhD Context By working with ceramic restorations, the dentist often needs to perform clinical adjustments through wear by diamond burs, consequently removing the superficial glazing layer. These adjustments are needed when the restoration exhibits ...

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What is the role of glass-ionomer cements in the preservation of tooth structures against caries?

This summary is based on the article published in the British Dental Journal: Minimal intervention dentistry II: part 7. Minimal intervention in cariology: the role of glass-ionomer cements in the preservation of tooth structures against caries (May 2014) H. Ngo and S. Opsahl-Vital     Context Glass-ionomer cements (GICs) are essential materials in clinical practice because of their versatility, self-adhesion to enamel and dentine, and good biocompatibility. In addition, being chemically cured, with no shrinkage stress, makes them well suited for minimally invasive restorative techniques. Purpose of the Article This article looks at some of the clinical situations where the ...

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