Practice Quiz

ADA NBDHE Dental Hygienist

Category - Provision of Clinical Dental Hygiene Services

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What are the four types of tooth wear?
  1. Attrition, abrasion, crowning, and ridging
  2. Attrition, abrasion, erosion, and abfraction
  3. Attribution, erosion, crowning, and abfraction
  4. Erosion, abrasion, abfraction, and protrusion
Explanation
Answer: B - The four types of tooth wear are attrition, abrasion, erosion, and abfraction. Attrition is the normal wear and tear of the occlusal and incisal surfaces. Abrasion is abnormal wear due to items such as toothbrushes or toothpicks. Erosion is by chemical means, such as acidic foods or drinks and stomach acid from constant self-induced vomiting. Abfraction is the pathological loss of tooth enamel and dentin by biomechanical loading forces, such as abnormal tongue activity or bruxism.
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