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Blog By:
Claire J

(A). Primary dentin
(B). Secondary dentin
(C). Tertiary dentin

Keyword: injury

Dentin comprises the main portion of the tooth. It is softer than enamel but harder than bone. There are different types of dentin:

• The dentin that forms when a tooth erupts is called primary dentin.
• The dentin that forms inside the primary dentin is called secondary dentin. This secondary dentin will continue to grow throughout the life of the tooth and can result in the narrowing of the pulp canal.
• Tertiary dentin, also known as reparative or reactive dentin, forms as a response to irritation and trauma such as erosion and dental caries.

Answer: (C). Tertiary dentin

The image illustrates the three different types of dentin we just reviewed so take one more look at it! While we are discussing this topic, let’s review a little more about the dentin for the dental hygiene board exam (NBDHE, NDHCE).

• Dentin is calcified tissue composed of 70% minerals around the pulp under the enamel.
• The bulk of the crown is composed of dentin present in the crown and root portion.
• The root dentin is covered by cementum (approximately 50% mineralized).

We have covered some information related to the dentin today but make sure to review the enamel and cementum as well! If you have a subscription to StudentRDH Dental hygiene board exam review, you can open the chapter of Dental Anatomy and find the section called “General function and structure of the tooth.” You will see bullet points that summarize only what you really need to know.

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