INBDE (Integrated National Board Dental Examination) Practice Exam

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What is the specified FL width for a cingulum rest?

1mm
1.5mm
2mm
2.5mm

The correct answer is: 2mm

When determining the specified FL (facial-lingual) width for a cingulum rest, the general rule of thumb is to use a width that is approximately 1/3 of the cingulum length. Based on this rule, 2mm would be the most appropriate choice. Option A and B (1mm and 1.5mm respectively) would be too narrow and might not provide enough stability for the restoration. Option D (2.5mm) would be too wide and could potentially interfere with the occlusion. Therefore, option C (2mm) is the best choice for the specified FL width for a cingulum rest.