在後牙窩洞的復形選擇時，當面臨較大的齒質缺損，和不易建立鄰牙接觸區及牙體外形的區域時，使用直接復形物常常會有其一定的困難限制和不佳的預後。隨著嵌體材料及黏合劑強度的發展，嵌體治療不僅能避免樹脂填補所產生聚合收縮的併發症，也能提供患者牙齒更佳的功能外形及咬合穩定。嵌體的使用上主要有金屬嵌體及陶瓷嵌體。貴金屬嵌體在口中的應用已有長期使用的成功追蹤報告佐證。現今，由於瓷塊強度及電腦製備技術的進步，以及患者和醫師對美觀的要求提高，電腦輔助設計製造陶瓷嵌體的使用不僅能達到良好的功能及外形，更可達到令患者滿意的色澤及美觀。在此從比較兩種嵌體的優缺點，窩洞修形方式到操作和黏著上的不同，並以病例的分享，讓操作者在選擇使用嵌體治療時有更明確的考量及更佳的預後。

There are several treatment options for restoring posterior teeth. When a large defect or superior control of contours and contacts are desired, indirect procedures not only can prevent the shrinkage of the composite resin filling, but also can offer greater control over complex tooth form and occlusion stability. The most used materials of indirect inlay restoration are high-gold alloy and ceramic. Gold inlay provides a strong, biocompatible, long-lasting option with a long history of outstanding service in dentistry. During recent years, increased demands for aesthetics in dentistry resulted in the development of restorative materials and CAD/CAM technology for the fabrication of ceramic restoration. This report discusses these two kinds of inlay system, and presents the clinical cases for helping practitioners in making the most appropriate selection.