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
A 45 year old female patient returns to your clinic with complaint of food lodgement in interproximal area of 47. On intraoral examination, 47 is restored with mesio-disto-occlusal amalgam restoration. Which type of matrix is used for this preparation?
assistant
The correct answer is  When little tooth structure remains and deep gingival margins are present, the Tofflemire matrix may not function successfully, and the Automatrix system is beneficial.