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 ...Read More »
In this short video (1:56), Dr. Bob Loney, Professor and Chair of the Dental Clinical Sciences Department at the Faculty of Dentistry, Dalhousie University, demonstrates how to remove gutta percha from a root canal in order to prepare an adequate post space to support a restoration on an endodontically treated tooth. Use non-end cutting drills to prepare the post space. Always start with the smallest size of Gates Glidden drill or Peeso reamer and work up to the size required to accommodate the desired size of a post. Size the instrument, referring to a radiograph of the tooth ...Read More »
How is the “Dahl appliance” used in the treatment of severely worn maxillary anterior teeth prior to reconstruction?
This question was submitted by a general dental practitioner: Does anyone have experience with the “Dahl appliance” used in the treatment of a severely worn maxillary anterior teeth prior to reconstruction? Dr. Effrat Habsha, Prosthodontist at Prosthodontic Associates offered this quick initial response: The Dahl Concept and the Dahl Appliance The Dahl Concept refers to the relative axial tooth movement that is observed when a localized appliance or localized restorations are placed in supra-occlusion and the occlusion re-establishes full arch contacts over a period of time. This concept can be achieved with a Dahl appliance, which refers to any interim restoration or prosthesis ...Read More »
All-ceramic dental crowns VS. metal-ceramic dental crowns: what is the clinical and cost effectiveness?
This Rapid Response is produced by the Canadian Agency for Drugs and Technologies in Health (www.cadth.ca) Report in Brief (PDF) Full Report (PDF) Key Findings The short term (< 5 years) survival of all-ceramic crowns when used for anterior teeth is comparable to porcelain fused to metal crowns. Summary of Findings Dental Crown Survival Posterior all-ceramic crowns fabricated from alumina, reinforced glass-ceramic, zirconia, or lithium disilicate had comparable survival rates to posterior PFM crowns (< 5 years analysis). InCeram and glass-ceramic, ...Read More »
From Dr. Berge Wazirian, Prosthodontist, Clinique de Prosthodontie & McGill University With the advancement of dental technology, dentists today are confronted with many different options when it comes to choosing a material for fixed partial dentures (FPDs). The wide array of materials range from multilayered systems to monolithic systems. Monolithic methods include: 1. Full contour metal restorations 2. Full contour zirconia restorations 3. Full contour lithium disilicate restorations (i.e. E.max) 4. Full contour Lucite reinforced restorations (i.e. Empress) Multilayered methods include: 1. Ceramo-metal restorations 2. Ceramo-zirconia restorations 3. Layered lithium disilicate restorations (i.e. E.max) 4. Alumina based restorations (i.e. In ...Read More »