[Advantages and disadvantages of endocrown restorations of endodontically treated teeth with large coronal destruction].

The strength of endodontically treated teeth were reduced apparently because of structural damage, therefore further reduction of healthy tissue should be avoided as much as possible in restoration. Endocrown made by chair-side CAD/CAM is some kind of minimal invasive restoration, and the retention of restoration is achieved by reliable bonding and macromechanial retention forces. Without post preparation, the root structure could be resevered. Following the indications and use of biomechanical dentin-like CAD/CAM materials could reduce the adverse effect of tensile stress on cervical part.根管治疗牙因牙齿结构完整性被破坏而抗力下降，冠方修复时应尽量多地保存健康牙体组织。嵌体冠利用粘接和髓腔机械固位形获得固位，具有微创、技术敏感性低等优势。椅旁计算机辅助设计与辅助制作（computer aided design and computer aided manufacture，CAD/CAM）技术的发展使嵌体冠应用得越来越多，但临床上也应注意把握适应证，保证有效粘接，选择生物力学性能类似于牙体组织的材料以减少嵌入性修复体的侧向应力。.