32 | DENTAL PRODUCT SHOPPER www.dentalproductshopper.com JAMES CHAE, DDS Dr. James Chae graduated from the University of California San Francisco School of Dentistry in 2000. He currently owns a private practice in Diamond Bar, CA, called Diamond Bar Dental Group, where he practices general and cosmetic dentistry. A member of the American Academy of Cosmetic Dentistry, California Dental Association, and American Dental Association, Dr. Chae has published cases in various dental publications. He shares his work and answers questions on Facebook and Instagram using the handle @diamondbar dentalgroup. NEW PRODUCTS | PRODUCT SPOTLIGHT | TRIED & TRUE CLINICAL PRACTICE PRODUCT focus A 28-year-old woman presented with an old, failing amalgam restoration on the occlusal surface and a missing filling on the buccal sur- face of tooth No. 19 (Figure 1). Bitewing and periapi- cal x-rays were taken to ensure that no interproximal caries or periapical lesions were present (SuniRay, Suni). Then, an intraoral photo was taken to present and confirm the caries (CS 1200, Carestream). After distributing 2% Lidocaine with 1:100,000 epinephrine on the inferior alveolar block, a rubber dam was placed (Figure 2). The existing amalgam was then removed using an inverted cone diamond bur (Figure 3) and all soft caries were removed using carbide round burs with a slow-speed handpiece (Midwest Shorty, Dentsply Sirona). To ensure a clean, neat cavity preparation, the superficial caries and stains were removed conservatively with a small round diamond bur. Intraoral photos were taken to confirm no caries were left behind (Figures 4-5). To ensure absolute isolation, a liquid dam was placed around the tooth (Figure 6). Creating a Durable Restoration TheraCal LC (BISCO) was placed on the cavity surface to decrease sensitivity and mask the dark amalgam stain that could potentially show through the planned translucent composite restoration (Figure 7). TheraCal LC is a resin-based calcium silicate containing material that is ideal to use as a protective liner in deep cavity preparations; it can be easily placed through its syringe delivery system. It also is highly durable and allows for immediate placement. In this case, I placed TheraCal LC on the deep cavity surface and light-cured it for 20 seconds. A wide bevel was placed on the occlusal and buccal surfaces and a selective enamel etching technique was performed using 37% phosphoric acid (Figure 8). The area was rinsed and dried and a bonding agent was placed and then lightly air dried. Using a condenser, composite shades A2 and A3 (Estelite Sigma Quick, Tokuyama Dental) were placed on the occlusal and buccal surfaces, respectively. Before light curing, some occlusal anatomy was created using several hand instruments (21B Burnisher, Hu-Friedy; Blue Titanium CIB3, Pioneer Solution; CEEX3A, Nordent). Then, occlusal adjustments were made and more detailed anatomy was created using football- and needle-shaped diamond burs (Brasseler USA). Polishing and Final Outcome Polishing was completed using a large coarse polishing disc (Sof-Lex, 3M), a fine needle-shaped diamond bur, and a White Arkansas Stone (Dedeco). The final restoration blended nicely to the tooth after occlusal adjustments and polishing (Figures 9-10). My patients never leave the office without a clear view of the final outcome, and this patient was completely relieved and happy to see such a healthy, natural-looking restoration before she left the chair. CASE PRESENTATION Protecting the Deep Cavity Surface Figure 1—Preoperative view of failing amalgam restoration and missing filling on the buccal surface of tooth No. 19