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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
Optimal enamel bevel features for a class 3 or 4 composite is:
assistant
The correct answer is  Enamel margins are beveled with a FLAME SHAPED OR ROUND DIAMOND INSTRUMENT.
Bevel is prepared by creating a 45 degree angle to the internal surface and width of 0.5-2 mm depending on the size of the preparation, location of margin and esthetic requirement.