All-Metal (e.g. Gold Alloy) Advantages • Metal occlusal surfaces protect weak cusps and cause minimal wear of opposing dentition • Excellent clinical longevity Considerations • Contraindicated for patients with metal allergies or concerns about metal (ref. 11) • Esthetics may be unacceptable for some patients • Conservative tooth preparation Porcelain Fused to Metal (PFM) Advantages • Excellent esthetics possible • Predictable service and clinical longevity • Versatility (single units to long span bridges) (ref. 12) Considerations • The possibility for metal exposed margins. Restorations may appear chalky, opaque or gray with time • Contraindicated for patients with metal allergies or concerns about metal (ref. 13) • May wear opposing dentition All-Ceramic and Composite Resin Indirect Restorative Materials Advantages • High esthetic possibilities. No metal exposed margins. No chalky, opaque or gray appearance • Non-metal for patients with metal allergies or for those who do not want metal in their mouth (ref. 15) Considerations • Long-term clinical trial results are not available (ref. 16) • Cementation is more technique-sensitive and time consuming than for conventional crowns (ref. 16) • Occlusal adjustments are made after cementation. If the cemented restoration does not fit, removal from the tooth may be extremely difficult (ref. 16) • Gingival irritation is possible given inadequately finished margins (ref. 16) • The potential for higher fracture rates in posterior teeth (ref. 12) • May wear the opposing dentition (ref. 17) • Contraindicated for: - Preparations with short clinical crown height - Placement in posterior, stress bearing areas - For bruxers, clenchers, or patients with no canine guidance (ref. 16) Copyright © 1999 3M. All rights reserved.