Final answer:
Stainless steel crowns on primary teeth are indeed designed to stay in place until the permanent tooth comes in, acting as a durable temporary restoration.
Step-by-step explanation:
The statement that stainless steel crowns placed on primary teeth stay in place until the permanent tooth erupts is true. Stainless steel crowns are commonly used in pediatric dentistry to preserve a tooth that has been compromised by decay, damage, or developmental anomalies. These crowns are designed to fit over the entire tooth, to restore its shape, size, and function, while providing a high level of durability. They act as a temporary measure and naturally fall out with the primary tooth when it is time for the permanent tooth to erupt.