National Dental Examining Board of Canada (NDEB) Practice Exam

Question: 1 / 400

When does the Periodontal Ligament (PDL) achieve its final structural form?

At birth

During puberty

Until tooth reaches a functional occlusion

The PDL is a bundle of collagen fibers that run from the cementum of the tooth to the alveolar bone of the jaw. It is responsible for anchoring the tooth to the bone, providing support and nutrition to the teeth. The PDL achieves its final structural form until the tooth reaches a functional occlusion, which is when it meets the opposite tooth in a way that allows for proper chewing and grinding. At birth, the PDL is not fully developed and continues to mature and evolve until functional occlusion is reached, typically during puberty. After the first tooth erupts, the PDL is already forming but it is not fully developed until functional occlusion is achieved. Therefore, the correct answer is C.

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After the first tooth erupts

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