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Written by George Freedman, DDS Thursday, 20 September 2012 15:20
In First Impressions George Freedman, DDS, gives readers a brief summary of products that have recently been introduced to dentistry, based on his clinical experience.
Scotchbond Universal Adhesive
The profusion of adhesive materials can boggle the clinical mind. There are more than 200 adhesive products available to practitioners today, leading to many questions: Which one to use? Under what conditions? For which indications? Is it better to stock a different bonding agent for every major indication and procedure? 3M ESPE has introduced Scotchbond Universal Adhesive, a single-bottle solution for all dental surfaces that can be used predictably in total-etch, self-etch, or selective-etch procedures. It offers the clinician the confidence to adhere methacrylate-based restoratives, cements, and sealants to dentin, enamel, indirect restorative materials, and glass ionomers without requiring an additional primer. Its primary indication is for use with light-cured materials. With the addition of the 3M ESPE Dual Cure Activator, it adheres to self-cure and dual-cure composites, including cements. It forms a strong bond that seals the dentinal surface for self-etch and total-etch procedures, protecting the dentin by eliminating open tubules that can cause sensitivity. It can also be used as a desensitizer for patients who do not require a restoration. There is virtually no postoperative sensitivity. Scotchbond Universal Adhesive’s high-moisture tolerance permits adhesion to both moist and dry dentin. The dispensing bottle has an innovative flip-top cap design permitting the operator to open and dispense with one hand. The material is also available in unit dose. With a 2-year shelf life and no refrigeration required, the orange Scotchbond vial protects the photo initiators inside from ambient light and—when held up to a bright light—indicates the remaining level of the adhesive fluid. Scotchbond Universal Adhesive is an adhesive for all procedures.
PermaShade LC (Light Cure Veneer Luting Resin)
The lab technician has returned the indirect veneers. In the chair, the patient is eagerly anticipating his/her new smile. What do you use for cementation? In the past, veneer-specific techniques required stocking 3 or 4 different cementation systems, depending on the fabrication process and material restoration. The veneers could also be greatly impacted by the shade of the resin cement; try-in pastes were of little help due to their high variability from the coloration of the final resin-luting agent. Ultradent Products’ PermaShade LC is an aesthetic, high-bond strength, versatile answer to common clinical concerns. The material is indicated for all indirect veneers, including porcelain, zirconia, composite, and other materials. Low shrinkage during curing prevents stress on the veneer, minimizing cementation fracture lines and cracks. The 6-mm depth of cure guarantees polymerization at the tooth-resin interface even through ceramic ve-neers. PermaShade LC is a strictly light-cured material; there is no detectable shade shift as the veneer and the underlying resin cement age. The shade of the resin cement is based on Ultradent Products’ VITA system that includes Opaque White, A2, B1, and the most popular, Translucent, simplifying the color matching to existing teeth and the masking of discolorations. Conveniently, the material is best handled at room temperature and is delivered in an ergonomic, 0.95-g contra-angle syringe for precise loading. The recommended technique includes phosphoric acid cleansing of the enamel surface and the use of Teflon tape to isolate the teeth during adhesion, preventing in-advertent resin on adjacent teeth. The radiopacity of PermaShade LC is equal to 2-mm aluminum, making it readily visible on radiographs.