Question: What is a vertical root fracture and why is the outlook so poor?
Explanation: A vertical root fracture is a longitudinal crack running along the long axis of the root, usually from the inside outwards. It most commonly affects root-filled teeth, particularly those with posts or heavy restorations. Symptoms are vague and often chronic. Patients report a dull ache, discomfort on biting, and a persistent sinus tract near the gum margin. A deep, narrow, isolated periodontal pocket is a classic sign. Because bacteria colonise the fracture line and it cannot be sealed, the prognosis is poor. Extraction is the usual outcome, though root resection is occasionally possible in multi-rooted teeth.
Related Questions:
Can a vertical root fracture be repaired?
Very rarely, and only in specific circumstances. In molars, the affected root can sometimes be surgically amputated, leaving the remaining roots functional. In single-rooted teeth, no predictable repair exists. Bonding agents placed in the fracture line do not survive long term.
Why do root-filled teeth get vertical root fractures?
Root canal treatment removes internal tissue and dentine, and posts create wedging stresses. Over-preparation of the canal and excessive lateral condensation forces during obturation contribute. Teeth that have lost significant structure to decay are inherently weakened before treatment even begins.
How is a vertical root fracture diagnosed?
Often by exclusion and by clinical signs. A deep isolated probing defect, a sinus tract, and a J-shaped radiolucency on the radiograph are suggestive. CBCT imaging improves detection. Definitive confirmation frequently only comes when a surgical flap is raised.
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