INBDE (Integrated National Board Dental Examination) Practice Exam

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How much MD width should an incisal rest be?

2mm
2.5mm
3mm
3.5mm

The correct answer is: 2.5mm

An incisal rest is a type of rest used in dental prosthetics to provide support and stabilization for a denture or partial denture. It is placed on the lingual surface of the anterior teeth and is usually in the form of a metal or resin cap. The incisal rest should be approximately 2.5mm in mesial-distal (MD) width. This is because it needs to be wide enough to provide adequate support and distribute pressure on the underlying teeth, but not too wide as to interfere with the patient's occlusion or cause discomfort. Option A (2mm) may be too narrow and unstable, while option C (3mm) and D (3.5mm) may be too wide and uncomfortable for the patient. It is important to note that the exact MD width may vary depending on the specific case and patient's individual needs. However, 2.5mm is generally considered the optimal width for an incisal rest.