Internal resorption is a process where the dentin, the inner hard tissue of the tooth, is gradually broken down from the inside. This occurs due to inflammation within the pulp, the soft tissue that contains nerves and blood vessels. The process is driven by specialized cells that begin to resorb, or dissolve, the internal tooth structure. This condition is often triggered by factors such as trauma, deep decay, or chronic irritation to the pulp. As the resorption progresses, the inner portion of the tooth becomes enlarged or hollowed out. In some cases, the outer enamel may remain intact initially, making the condition difficult to detect without imaging. If this process continues, the structural integrity of the tooth may weaken, increasing the risk of fracture or perforation. In advanced cases, the resorption can extend through the tooth and affect surrounding tissues. Early detection is important to limit progression and preserve the tooth.
Understanding
Internal Resorption
Clinical Significance
Can lead to weakening of tooth structure, perforation, infection, discoloration, or tooth loss if untreated.
Common Causes
Dental trauma, deep decay, chronic pulp inflammation, previous dental procedures, unknown (idiopathic) factors
Signs & Symptoms
Possibly none, or pinkish discoloration of tooth (pink tooth), sensitivity, internal structural changes, rarely pain unless advanced
How It's Detected
Dental X-rays, CBCT imaging, clinical exam, visual discoloration, pulp testing
Treatment Options
Root canal therapy, monitoring in early or inactive cases, extraction if severe or perforated, no treatment not recommended if active
Benefits to Treatment
Stops progression, preserves remaining tooth structure, prevents perforation, reduces risk of infection, supports long-term tooth retention
Prevention
Prompt treatment of dental trauma, early management of decay, regular dental checkups, monitoring previously injured teeth
Frequently Asked Questions
What is the "pink tooth" associated with internal resorption?
The "pink tooth" is a classic sign of internal resorption. It occurs when the inner part of the tooth becomes enlarged and the underlying blood supply shows through the remaining enamel, giving the tooth a pinkish appearance. In many cases, this change is subtle and may go unnoticed. It is an important clinical sign that requires evaluation.
Is internal resorption painful?
Internal resorption is often not painful, especially in its early stages. In many cases, it is discovered during routine dental X-rays rather than from symptoms. Pain may develop if the condition progresses to involve surrounding tissues or leads to infection. This means absence of pain does not necessarily indicate that the tooth is healthy.
What is the most common treatment for internal resorption?
The most common treatment is root canal therapy. This procedure removes the inflamed or damaged pulp tissue that is driving the resorption process. By eliminating the source of inflammation, the progression of resorption can be stopped. In many cases, this helps preserve the remaining tooth structure.
Can internal resorption stop on its own?
In some cases, internal resorption may become inactive, but active resorption typically does not stop on its own without treatment. The process is driven by inflammation within the pulp, and as long as this inflammation persists, the breakdown of tooth structure may continue. Professional evaluation is needed to determine whether the process is active.
How serious is internal resorption?
Internal resorption can range from mild to severe. In early stages, it may be manageable with timely treatment. However, if it progresses, it can weaken the tooth and lead to complications such as perforation or fracture. Early detection plays an important role in preserving the tooth and reducing the risk of more complex treatment.