Laboratory work by LeBeau Precision Aesthetics, Kent, Wash.
A 69-year-old female presented with three broken teeth and seven missing teeth. The clinical examination found existing crowns with poor marginal integrity on teeth Nos. 2, 14, 19 and 31, and confirmed the need for a full mouth rehabilitation (Fig. 1). The treatment plan included removal of the hopeless teeth and replacement with dental implants, as well as new crowns to replace the failing restorations. This excerpt demonstrates the procedure used for restoring the lower anterior restorations. 3M™ ESPE™ Lava™ Zirconia was selected as the restorative material, due to its esthetics and strength, as well as the clinician's prior positive experience with the material's quality and accuracy of fit.
The 3M™ ESPE™ Lava™ Chairside Oral Scanner C.O.S. was used to capture impressions for the case. For the scanning of teeth Nos. 22-27, the provisionals were removed, and preparations were cleaned with a prophy cup and hydrated flour of pumice. An initial retraction cord was placed circumferentially around all teeth and the preps were refined. A second retraction cord was then placed for final isolation of the prepared teeth. All teeth were then powdered lightly (Fig. 2), and the Lava C.O.S. wand was used to capture a digital impression of both arches. The image was displayed on the chairside monitor during the scanning process, and reviewed for completion at the end of the scan (Fig. 3). An online prescription was then completed on the monitor and sent to the dental laboratory.
The crowns were returned to the office with a resin SLA model and tried in the patient's mouth (Fig. 4). Minor adjustments were made to the interproximal contact areas of teeth Nos. 24 and 25 only. No other adjustments were necessary. The crowns were then permanently seated with 3M™ ESPE™ RelyX™ Luting Cement. The total time to cement the restorations was approximately 30 minutes.
The patient was very pleased with the appearance of her crowns, and the clinician was pleased with the smooth process enabled by the Lava C.O.S. (Fig. 5).
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