Shade selection can, at times, be a real mystery. The relationship between Vita and other shade systems can add unnecessary complexity to cases that are complex enough. Factor in differences in dentine hydration levels, ambient lighting, and product opacity and what appears like an A2 in the lab might look entirely different in the mouth.
Local clients are encouraged to book an in-lab custom shade selection, free of charge, in any case where perfectly accurate matching is complex. Using digital photography or digital shade meters can also aid in making sure the shade you see in the mouth is accurately applied to the finished product. Refer to the digital camera shade checklist to make sure we're able to see the same thing your camera sees if you choose to submit digital images.