When creating a metallic porcelain crown for a lower premolar, how should the tooth be covered?

In the context of creating a metallic porcelain crown for a lower premolar, covering just the buccal cusp with porcelain is appropriate because it allows for an adequate balance between aesthetics and function. The buccal surface is typically more visible than the occlusal surface, making it important to ensure that this area provides a pleasing appearance, particularly in patients who value aesthetics in their smile.

The technique of applying porcelain only to the buccal cusp can also help preserve the strength and integrity of the crown. Premolars are subjected to significant occlusal forces during chewing, and maintaining a solid metallic foundation beneath the occlusal surface helps the crown withstand these pressures without compromising its structural stability.

In contrast, covering the entire tooth with metal or avoiding coverage of the buccal surface could lead to compromises in aesthetics or functionality. A full metal coverage may not provide the desired look for patients seeking a more natural appearance, while insufficient porcelain coverage could lead to a crown that is marked less attractive aesthetically, especially when viewed from the side or in a smile.