INBDE (Integrated National Board Dental Examination) Practice Exam

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What is the most common osseous defect?

  1. Three-wall intrabony defect

  2. Hemi-septal defect

  3. Two-wall intrabony defects

  4. One-wall intrabony defect

The correct answer is: Two-wall intrabony defects

The most common osseous defect is the two-wall intrabony defect. These types of defects occur when the bone around the tooth is damaged and there are two bony walls left. This leaves a space for bacteria to accumulate and cause further damage to the tooth and surrounding bone. This type of defect is more common because it is often caused by periodontal disease, which is a common oral health issue. The other options (A, B, and D) are not as common because they involve a different number of bony walls being affected, and may occur due to different causes or conditions.

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