Occlusal Effect Caries (OEC) - The Hybrid Layer

Summary – What is Occlusal Effect Caries (OEC)?

Occlusal Effect Caries (OEC) forms as a result of biofilm formation inside cracks. These cracks are commonly a result of Peripheral Rim Fractures (PRF), which can form due to structural compromise. Bacteria enters through the crack which is located on the occlusal aspect of the tooth, causing caries.

Structurally compromised tooth with a mesial peripheral rim fracture — **Fig 1.** Structurally compromised tooth with a mesial PRF.
*Photo credit: Dr Ashley Chung*

**Fig 2.** Clinical example of Occlusal Effect Caries.
*Photo credit: Dr Ashley Chung*

Occlusal Effect Caries starting at the DEJ — **Fig 3.** OEC starting at the DEJ.
*Photo credit: Dr Ashley Chung*

Learn More…

To learn more about Occlusal Effect Caries and how this occurs as a result of structural compromises, see Lesson 2 of the Six Lessons Approach to Biomimetic Dentistry below.

Lesson 2 – Diagnosis And Treatment Of Structural Compromises