What is a common indication for using metal inlays over porcelain inlays?

Metal inlays are often chosen over porcelain inlays primarily due to their higher strength and durability. Metal materials, such as gold or other alloys, possess superior mechanical properties compared to porcelain. This makes them particularly suitable for areas in the mouth that experience significant stress and force during chewing, such as molars.

Metal inlays can withstand heavy occlusal forces better than porcelain inlays, which can be more prone to chipping or fracture under pressure. This characteristic is especially important in patients with strong bite forces or those who grind their teeth. By utilizing metal inlays, dental professionals can provide a restoration that is more likely to last a long time without failure, thereby enhancing the longevity and functionality of the restoration.

While aesthetics, preparation requirements, and cost are relevant factors in treatment planning, they are not the primary reasons for selecting metal over porcelain inlays in practice. The strength and durability of metal inlays make them an excellent choice in more demanding dental situations.