It is difficult to determine which crown material lasts the longest, as the lifespan of a crown can depend on various factors such as the location of the crown in the mouth, the oral hygiene habits of the patient, and the skill of the dentist in placing the crown. Some of the most commonly used crown materials include porcelain-fused-to-metal, all-ceramic, and gold, and all of these materials have their own advantages and disadvantages. Porcelain-fused-to-metal crowns are strong and durable, but they may show a dark line at the gum line due to the metal base. All-ceramic crowns are natural-looking and can be matched to the color of the surrounding teeth, but they may not be as strong as other materials and are not recommended for use in certain locations in the mouth. Gold crowns are strong and long-lasting, but they may not be as aesthetically pleasing as other materials. Ultimately, the best crown material for a particular patient will depend on their individual needs and preferences, as well as the recommendation of their dentist.