Abfraction lesions are areas of tooth structure loss that occur near the gumline due to mechanical stress rather than decay or direct abrasion. These stresses are typically caused by biting forces, clenching, or grinding, which create repeated flexing of the tooth at its cervical area. Over time, this flexing can lead to microscopic fractures in the enamel and dentin. As these stresses continue, small portions of tooth structure may break away, forming wedge-shaped defects near the gumline. These lesions are often deeper and more sharply defined than those caused by abrasion. The affected area may expose dentin, which can increase sensitivity. If this process continues, the lesion may enlarge and contribute to further weakening of the tooth structure. Abfraction lesions can occur alone or alongside other types of tooth wear, such as abrasion or erosion, making diagnosis and management more complex.
Understanding
Abfraction Lesion
Clinical Significance
Can lead to tooth sensitivity, structural weakening, progression of tooth loss at the gumline, increased risk of fracture, and aesthetic concerns.
Common Causes
Teeth grinding or clenching (bruxism), excessive bite forces, misaligned bite, stress concentration on teeth, occlusal imbalance
Signs & Symptoms
Possibly none, or wedge-shaped defects near gumline, tooth sensitivity (especially to cold), sharp or V-shaped notches, localized wear on specific teeth
How It's Detected
Clinical exam, visual inspection of characteristic lesions, patient history of grinding or clenching, bite analysis
Treatment Options
Monitoring, occlusal adjustment, night guards, desensitizing agents, restorative treatment (bonding or fillings), no treatment in mild stable cases
Benefits to Treatment
Reduces sensitivity, prevents progression, protects tooth structure, improves comfort and appearance, addresses underlying bite forces
Prevention
Use of night guards, management of grinding or clenching, regular dental visits, early identification of bite issues, stress management
Frequently Asked Questions
What is the difference between abfraction and abrasion?
Abfraction is caused by stress and flexing forces on the tooth, while abrasion is caused by external mechanical wear, such as aggressive brushing. In many cases, abfraction lesions appear as sharp, wedge-shaped defects, whereas abrasion lesions are typically smoother and more rounded. Both can occur near the gumline but have different underlying causes.
Are abfraction lesions cavities?
No, abfraction lesions are not cavities. Cavities are caused by bacterial activity and acid that break down tooth structure. Abfraction lesions result from mechanical stress and do not involve bacterial decay. However, areas affected by abfraction may become more sensitive and require monitoring.
Can abfraction lesions be reversed?
No, abfraction lesions cannot be reversed because lost tooth structure does not regenerate. However, treatment can help manage symptoms and prevent further damage. In many cases, addressing the underlying stress on the teeth is important to slow progression.
How are abfraction lesions treated?
Treatment depends on severity and symptoms. In many cases, managing bite forces with a night guard or occlusal adjustment is recommended. For sensitivity, desensitizing products may help. If the lesion is more advanced, restorative materials such as bonding or fillings may be used to protect the area and restore structure.
Do all abfraction lesions need treatment?
Not all abfraction lesions require treatment. In many cases, mild lesions that are not progressing or causing symptoms may be monitored. However, if sensitivity, progression, or structural concerns are present, treatment may be recommended. A dental evaluation helps determine the appropriate approach.