What device is typically used for the finishing touches on dental appliances after they've been shaped?

The device that is most commonly used for the finishing touches on dental appliances after they've been shaped is a lathe. A lathe allows for precise control over the finishing process, ensuring that the surfaces of dental appliances are smooth and shaped to the required specifications. This tool can rotate the appliance at high speeds, enabling the technician to polish and refine the shapes effectively, leading to a high-quality finish that is crucial for the comfort and functionality of dental devices.

While other devices mentioned in the options may play roles in smoothing or finishing, the lathe is preferred due to its versatility and the level of detail it can achieve, which is essential in dental applications where precision is key. A finishing polisher, for example, might also be used for adding a final shine, but it typically works in conjunction with the lathe for optimal results. Similarly, while a detailing machine may suggest a focus on creating fine details, it does not replace the fundamental capabilities of a lathe in achieving the overall finishing of dental appliances.