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In the context of porcelain-fused-to-metal (PFM) crowns, the typical composition of noble metals in the copings usually falls within the range of 50-60%. This percentage is significant because noble metals, such as gold and platinum, provide not only biocompatibility and corrosion resistance but also the strength needed to support the ceramic material that is bonded to it. The specific content ensures that the restoration has adequate durability while also being aesthetically pleasing, which is essential for a successful outcome in dental procedures.

Higher percentages of noble metals, such as those found in options suggesting 70-80% or even 90-95%, are usually reserved for specific high-end restorations or particular clinical situations. Such compositions would increase cost without significant benefits in typical PFM cases. Lower percentages, on the other hand, might compromise the strength and longevity of the coping, thereby affecting the overall effectiveness of the restoration in clinical use.