D2921 — Reattachment of tooth fragment (incisal edge or cusp)

What D2921 specifies

Tooth — a front tooth — thinner enamel, a single root, and a result that is judged cosmetically rather than just functionally.

What reattachment of tooth fragment involves

When a front tooth fractures and the broken piece survives intact, it can sometimes be bonded straight back on. The fragment is the perfect shade match, the perfect shape and the perfect surface texture, because it is the tooth. Nothing a dentist can build will look as good as the original. The technique is adhesive: the fracture surfaces are cleaned and etched, bonding agent and a thin layer of composite are applied, the fragment is seated precisely and cured, and the join line is finished and polished. It takes a similar amount of time to a composite build-up and produces a distinctly better aesthetic result.

When this treatment is used

Applies mainly to trauma in children and young adults — a fall, a sporting injury, a bicycle accident — where an incisal corner or a larger fragment of a front tooth has broken off cleanly and has been kept. Success depends on the fragment being found, being reasonably clean and not being dried out for too long.

What to do in the first hour

Find the fragment and keep it wet. Milk, saline, or the patient's own saliva are all acceptable; water is a distant last resort because it damages the tissue. A dried-out fragment becomes brittle and opaque and bonds less well, so putting it in liquid matters more than getting to the surgery in the next ten minutes. The tooth itself needs assessment even if the fragment is reattached successfully. A fracture large enough to break a corner off usually delivered enough force to traumatise the pulp, so the tooth needs vitality testing at the time and follow-up over the following months. A proportion of traumatised front teeth die months or years later and need root canal treatment.

How long reattachment lasts

A bonded fragment is not as strong as an intact tooth — the bond line is a weak plane, and re-fracture at the same place is the common mode of failure, especially in someone who broke it playing sport and is going straight back to playing sport. A mouthguard is a sensible condition of the treatment. Even a reattachment that fails after two years has usually been worth doing: it buys time, looks excellent in the interim, and can be redone or converted to a composite build-up without having cost the patient any tooth structure.