To fabricate a partial veneer as a retainer for a long span FDP is considered?

In the context of prosthetic dentistry, the fabrication of a partial veneer for a retainer in a long span fixed dental prosthesis (FDP) is generally viewed as a contraindication. This is primarily because a partial veneer does not provide enough retention and support for a long span FDP. When planning such prostheses, it is important to ensure that the retainers have the necessary strength and stability to withstand the occlusal forces they will encounter once the FDP is in function.

Long span FDPs typically require full crowns or similar restorations that can adequately manage the additional stresses that come with a larger unit. Partial veneers may not cover enough of the tooth structure and can lead to issues like fracture of the restoration or failure of the prosthesis itself due to insufficient support.

Therefore, for retainers in long-span FDPs, it is crucial to utilize full coverage designs that enhance retention, strength, and durability of the restoration, making the idea of using a partial veneer a contraindicated approach in this specific scenario.