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Dental Lab Products | January 2009
Inlay/onlay esthetics
Whether the restorations are being placed in the anterior or posterior segments of the oral cavity, IPS e.max provides solutions for conventional cementation or adhesive bonding that demonstrate the esthetics and physical properties necessary for successful dental treatment. For example, if a patient presents with failing restorations (e.g., gold inlays/onlays demonstrating microleakage or recurrent decay) that require replacement, the IPS e.max Press material may be used to satisfy the strength and functional requirements (Fig. A). IPS e.max Press also offers simplicity and versatility when fabricating high-strength, esthetic, metal-free restorations, because the same lost-wax pressing techniques that ceramists are accustomed to can be used. This article outlines the laboratory procedures for using IPS e.max Press to complete fabrication of inlay/onlay restorations that were seated to replace failing posterior restorations. Facilitating the shade match was the material’s high translucency, while its inherent strength at 400 MPa was well suited for use in the posterior segment. Refer to slideshow for figures.
Twelve failing gold inlay/onlay restorations were replaced with 12 IPS e.max Press HT inlays and onlays. This required standard impression taking (Fig. B). Due to the deep subginigival margins, tooth #14 required individual separate dies to ensure optimal marginal integrity. Standard provisionalization protocols were also followed. At the laboratory, a model was made from the impressions that were received from the dentist. 01 Perform a full-contour wax-up of the restorations (Fig. C), similar to one completed for any pressed restoration. 02 Sprue the wax-up onto the ring former (Fig. D). 03 Invest the wax-up, burn it out, and press the appropriately colored IPS e.max Press ingot onto the wax-up (Fig. E). Note: In this case, the HT (High Translucency) B1 ingot was used. 04 Verify the occlusion using an articulator with the pressed restorations on the die (Fig. F). 05 Fire the restorations according to the manufacturer’s instructions and verify the fit of the restoration on the model. 06 Stain and glaze the restoration using the IPS e.max Shade Pastes, Essence materials, and glazes (Fig. G). Then fire to impart a natural luster in the restoration.
This article demonstrates using IPS e.max Press HT lithium disilicate material with a lost-wax technique to create esthetic posterior inlay/onlay restorations that blend seamlessly with natural tooth structure (Fig. H). The ability to provide an adhesively bondable restoration that demonstrates exceptional esthetics and physical properties (Fig. I) represents another opportunity for clinical success in modern dentistry.
Benefits of lithium disilicate Today, dentists and laboratories require materials that offer outstanding esthetics, high strength, and efficient productivity. IPS e.max lithium disilicate material maximizes these benefits and offers new options for improved patient care. This esthetic, high-strength material can be conventionally cemented or adhesively bonded. For fabricating a posterior crown in full contour, it offers 400 MPa of strength through the entire restoration, giving it a “monolithic” strength. If minimal tooth prep is desired, IPS e.max lithium disilicate provides the laboratory with the option to press restorations as thin as 0.3 mm. The versatility and clinical performance of this material allow both the dentist and laboratory to optimize productivity and achieve exceptional esthetics.
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