INBDE (Integrated National Board Dental Examination) Practice Exam

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What is the risk of pulpal necrosis in extrusion with a closed apex?

The correct answer is: 65%

Pulpal necrosis is a condition where the pulp tissue inside a tooth dies or becomes severely damaged. In an extrusion injury, the tooth has been partially forced out of its socket. Based on studies, the risk of pulpal necrosis in a tooth with a closed apex that has been extruded is around 65%. This means that there is a higher likelihood of this condition occurring compared to the other options given. Option A with a 6% risk is significantly lower and may not present a serious concern for pulpal necrosis. Option C with an 80% risk and Option D with a 96% risk are both much higher than the actual risk. It is important to note that the specific risk may vary depending on various factors such as the severity of the extrusion injury and the age of the patient. However, option B is the most accurate option provided for the risk of pulpal necrosis in extrusion with a closed apex.