Australian Dental Council (ADC) Practice Test 2026 - Free ADC Practice Questions and Study Guide

The correct answer reflects a common expectation in the field of endodontics regarding the healing process following a root canal treatment. Significant reduction in radiolucency, which often indicates healing of periapical lesions, typically occurs around six months after the completion of a root filling.

This timeframe is significant because it aligns with cellular healing processes and bone remodeling that follow the removal of infection and inflammation associated with necrotic pulp tissues. During the first few months, it is normal for healing to be gradual, as the body begins to respond to the treatment and starts repairing the surrounding bone.

By the six-month mark, many patients will show substantial signs of healing as the body continues to adapt and regenerate. This is often assessed through follow-up radiographs that reveal a decrease in the size of the radiolucent area at the apex of the tooth, indicating successful treatment and resolution of the previously infected or inflamed tissue.

Longer durations, such as 12 months or more, can indeed lead to further changes in the radiolucency, but most clinicians will expect to see a significant reduction within the six-month timeframe, making it an appropriate benchmark for assessing treatment outcomes.