To ensure long-term success of metal-ceramic FPDs, the minimal critical dimensions recommended for the connectors are an occlusogingival height of 2.5 mm and a buccolingual width of 2.5 mm, which provide for a connector surface area of 6.25 mm2.46,47 These dimensions may be achieved both in the anterior and in the posterior segments. However, this is not the case for all-ceramic FPDs. Owing to the primary mode of failure and the brittleness of ceramics, the required connector dimensions for all-ceramic FPDs are larger than those recommended for metal-ceramic FPDs. This may be a major contributing factor in restricting the versatility of their use. Therefore, appropriate diagnosis, patient selection, and conception of the requirements of proper ceramic framework design are all crucial for the success of these restorations. As previously mentioned, the lack of required space for desired connector dimensions may contraindicate the fabrication of an all-ceramic FPD