This question was submitted by a general dentist: What is the best approach to prevent secondary caries from spreading under composite restorations? Dr. Jacinta Santos, Assistant Professor of Restorative Dentistry, Schulich School of Dentistry at Western University, has provided this quick initial response. Drafted by Alexandra Rabalski, JCDA Oasis Intern Resin-modified glass-ionomer (RMGI) can be used as a liner or as a restorative material. RMGI releases fluoride, thus protecting the tooth against possible secondary caries. In addition, polymerization shrinkage is much lower for RMGI than for resin composite, generating less stress on the walls of the tooth. I always teach my students ...Read More »
What kind of restoration material is best recommended for root caries, especially where isolation is a problem?
This question was submitted to us by a general dentist: What kind of restoration material is best recommended for root caries, especially where isolation is a problem? Dr. Jacinta Santos, Assistant Professor of Restorative Dentistry, Schulich School of Dentistry at Western University, has provided this quick initial response. Drafted by Alexandra Rabalski, JCDA Oasis Intern In a root caries procedure, lack of dentin and poor isolation may present restoration challenges. Resin-modified glass-ionomer (RMGI) is a restorative material that can be used effectively in this situation. Clinical studies have demonstrated that RMGIs: Have very good retention over time (due it’s chemical and mechanical ...Read More »
This summary is based on two critical appraisals published in the Journal of Esthetic and Restorative Dentistry: Dental Amalgam Update—Part I: Clinical Efﬁcacy (October 2013) Dental Amalgam Update—Par t II: Biological Effects (December 2013) Context Dental amalgam use has been controversial ever since the Crawcour brothers of France introduced amalgam to the United States in 1833. It has been criticized for its alleged clinical shortcomings and biologic effects. Dental Amalgam Update—Part I: Clinical Efﬁcacy Studies Reviewed Bonded amalgam sealants and adhesive resin sealants: five-year clinical results. Quintessence Int. 2004 May;35(5):351-7. Cross-sectional radiographic survey of amalgam and resin-based composite posterior restorations. Quintessence Int. 2007 ...Read More »
This summary is based on the article published in the International Endodontic Journal: Effect of several bleaching agents on teeth stained with a resin-based sealer (January 2014) Context Remnants of root ﬁlling materials and sealers in root ﬁlled teeth have been shown to cause tooth discoloration. Various bleaching agents are available to reverse tooth discoloration, including hydrogen peroxide and sodium perborate. Several investigations have assessed the discoloration potential of sealers and their effects on the teeth. However, there appears to be no documented research on efficacy of different bleaching agents for reversing discoloration caused by endodontic sealers. Purpose of the Study The study was designed to evaluate the effects of ...Read More »
What is the best method to prepare enamel on teeth surface to improve the bonding of fixed orthodontic braces?
This summary is based on the Cochrane systematic review: Preparing tooth surfaces in preparation for the bonding of fixed orthodontic braces Context Acid etching of tooth surfaces to promote the bonding of orthodontic attachments to the enamel has been a routine procedure in orthodontic treatment since the 1960s. Various types of orthodontic etchants and etching techniques have been introduced in the past five decades. Although a large amount of information on this topic has been published, there is a significant lack of consensus regarding the clinical effects of different dental etchants and etching techniques. Purpose of the Review To compare the ...Read More »
This summary is based on the article published in Advances in Dental Research: What constitutes an ideal dental restorative material? (November 2013) Key Messages Intense environmental concerns recently have prompted dentistry to evaluate the performance and environmental impact of existing restoration materials. Doing so entices us to explore the ‘what if?’ innovation in materials science to create more ideal restorative materials. Articulating a specification for the design and evaluation methods is proving to be more complicated than originally anticipated. Challenges exist not only in specifying how the material should be manipulated and perform clinically, but also in understanding and incorporating implications of the skill of the operator placing the ...Read More »
This summary is based on the ADA Professional Product Review: A Laboratory Evaluation of Bulk-Fill Versus Traditional Multi-Increment-Fill Resin-Based Composites The Review can be accessed through the ADA website Access the full-text article (PDF) Context Unlike traditional composites, which typically are placed in maximum increments of 2 millimeters (mm), bulk-fill composites are designed to be placed in 4 mm, or sometimes greater, increments. Manufacturers claim that bulk-fill materials have greater depth of cure and lower polymerization induced shrinkage stress thanks to technology like “polymerization modulators,” which they say allow a certain amount of flexibility and optimized network structure during polymerization. Studies have demonstrated some comparable physical and mechanical properties among a handful of bulk-fill and traditional composites. ...Read More »
This question was submitted by a general dentist: Does warming composite prior to placing in preparation result in better depth curing? Dr. Jacinta Santos, Assistant Professor of Restorative Dentistry, Schulich School of Dentistry at Western University, provided a quick initial response Studies have demonstrated that pre-heating resin composite produces many benefits for the restoration process: Reduced pre-cured viscosity Enhanced adaptation Increased post-cured surface hardness Increased degree of polymerization Research shows that pre-heating composite in a heating device to a temperature of approximately 68°C (± 50 – 55 °C in the composite material) can provide advantages during the restoration process. However, once ...Read More »