system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In a class 1 cavity prepared for silver amalgam is extended to half the distance between the contact area and the fissures and the cusp tip, the direction of the buccal and lingual walls is:
assistant
The correct answer is  None