After root canals: filling, inlay or crown

The canals are treated, the pain is gone, there is a filling on top — the story seems finished. In fact it has only moved into a quiet phase. A tooth without a nerve no longer signals overload, so people chew on it as usual for years until one day it splits in half. The galling part is that by then there is often nothing to save: the crack runs below the gum, and the tooth has to come out after expensive treatment that was carried out impeccably.

Why a tooth without a nerve breaks

Three reasons, and they work together.

The tooth is now hollow. To reach the canals an access is cut and the pulp chamber is removed. The walls remain, but the internal framework is gone. Mechanically it is the difference between a whole nut and its shell.

It cannot feel overload. A vital tooth under excessive pressure hurts, and you instinctively chew more carefully. A root-treated tooth stays silent, and the load on it grows unnoticed.

The tissue becomes more brittle. Not as dramatically as often described — the tooth does not fully “dry out” — but it loses elasticity, and microcracks accumulate faster.

Back teeth are the most vulnerable. Molars take the heaviest load, and that is where root-treated teeth split most often. Front teeth, which cut rather than grind, live far more comfortably with a filling.

How the decision is made: counting walls

This is not a matter of the dentist's taste — the logic is fairly simple.

We look at how many of the tooth's own walls remain intact and how thick they are.

Four walls intact, a small cavity. A good filling is enough. Such a tooth has lost little and its framework is largely preserved.

Three walls. A borderline case. On a front tooth — a filling or a composite restoration. On a back tooth — better an inlay or a crown.

Two walls or fewer. A crown only. A filling here acts as a wedge: when you chew it pushes the walls apart from inside, and the tooth splits because of it rather than despite it.

Almost no walls left. The core is rebuilt first — a build-up from UAH 2,450, sometimes with a post — and the crown goes on that.

Also taken into account: whether there is a crack visible under the microscope; whether you have bruxism; whether this tooth will support a bridge; and how visible it is when you smile.

The three options in substance

A filling (composite restoration). The material is placed in layers directly in the mouth in one visit. Cheap and quick. Downsides: composite shrinks as it cures, darkens at the margin over the years and handles heavy load less well. A justified choice when the tooth has lost little.

Caries treatment with a restoration — UAH 2,350–3,900; composite restoration of front teeth — UAH 6,800–9,000.

An inlay. Essentially a filling made in a laboratory from a digital impression and bonded in as a single piece. No shrinkage, a precise contact with the neighbouring tooth, a ceramic surface that does not darken. It preserves more living tissue than a crown, since the tooth is barely prepared. A sensible compromise on a back tooth with three walls.

A crown. It covers the tooth completely and binds the walls from outside — which is why it is the only option that genuinely protects against splitting. The price of that is preparation all around. Zirconia from UAH 7,200, eMax from UAH 12,200. On lifespan there is a separate article.

Our approach is simple: take the least invasive option that will genuinely withstand the load. Not the most expensive and not the cheapest.

How long a temporary filling can stay

This is the second most common source of teeth lost after root canal treatment.

A temporary filling is placed for weeks, not months. It is porous and lets saliva with bacteria into the tooth. Within two or three months the canals you paid for are reinfected, and retreatment is needed.

Realistic limits: a temporary filling — two to four weeks; a permanent filling on a back tooth that needs a crown — two to three months, and that already carries risk.

If you are postponing the crown for financial reasons, say so plainly. That is a normal situation and it has intermediate solutions: a durable permanent restoration, reduced load, an agreed date. The worse option is to leave quietly and come back a year later with a split tooth.

Signs the tooth is overloaded: discomfort when biting on that particular tooth; a feeling that it sits “higher” than its neighbours; a hairline crack in the enamel; a chipped edge. With any of these, do not wait for a routine appointment.

What it costs in the end

Let us count honestly, because this is exactly the stage where people decide to economise.

Scenario “do it now”: root canal treatment from UAH 7,100 (pulpitis) + build-up UAH 2,450 + zirconia crown from UAH 7,200. The tooth works for 15–20 years.

Scenario “a filling for now”: root canal treatment + a filling at UAH 2,350–3,900. The immediate saving is around 7–9 thousand. Two or three years later the tooth splits, and then it is either retreatment plus a crown (the same money again, with treatment on top) or extraction and an implant — a different order of figures altogether.

So “let's put a filling for now and do the crown later” only makes sense with a specific date attached. Without a date it usually means never.

A consultation with a specialist costs UAH 690. At it the dentist looks at the X-ray, counts the walls and gives the options with figures — including the cheapest, if it is justified in your case.

Frequently asked questions

Oleksii Sydorenko

Prosthodontist

Prosthetics on a digital protocol: crowns, veneers, restorations on implants. A “do no harm” approach — preserving as much living tooth tissue as possible.

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