Precision attachments are not advisable for which of the following patients?

Precision attachments are designed to enhance the retention of removable dental prostheses while allowing for a certain degree of manipulation. For patients with low dexterity, using precision attachments can pose significant challenges. These patients may struggle with the fine motor skills required to properly align and secure the prostheses, leading to issues with comfort, retention, and overall function.

In contrast, patients with high dexterity are likely to handle these attachments more effectively. Individuals with good oral hygiene are also typically more capable of managing precision attachments since they maintain their prostheses better and reduce the risk of complications. Finally, those needing extensive restorative work may benefit from precision attachments for improved stability, although this is more contingent on their overall dexterity and ability to manage such devices than on the complexity of their dental needs.

In summary, the complexity of managing precision attachments aligns poorly with patients who have low dexterity, making these attachments inadvisable for that specific patient group.