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Deep decay between teeth treated with fibre-reinforced resin in Seogwipo

X-rays revealed deeper decay between molars than the surface suggested. Treatment preserved sound tooth and used polyethylene fibre with resin.

Published August 24, 2026·Dr. Soohyun Ko
Deep decay between teeth treated with fibre-reinforced resin in Seogwipo

Treatment at a glance

Initial findings
X-rays showed decay progressing into the tooth between the molars.
Treatment plan
We removed infected tissue while retaining as much preservable tooth structure as possible.
Treatment
Polyethylene fibre and resin were used to restore the teeth under rubber-dam isolation.
After treatment
We checked contacts between the teeth, chewing-surface shape and the bite.

Small surface changes can conceal deeper decay

Only a small discoloured area was visible on the chewing surface, but the X-ray showed decay extending inward between the teeth. Examination and imaging were assessed together.

X-ray showing decay extending inward between the molars.
X-ray showing decay extending inward between the molars.

Isolating the treatment area

The tooth was isolated with a rubber dam before treatment.

View before treatment with the rubber dam in place.
View before treatment with the rubber dam in place.

Revealing the actual extent

Access to the lesion revealed damage extending inward from the contact area. The internal decay was wider than the small surface change suggested.

The extent of decay seen after accessing the area between the teeth.
The extent of decay seen after accessing the area between the teeth.

Removing decay while preserving sound tooth

Decayed areas were removed while preservable sound tooth was retained. The remaining shape and restoration extent were then reassessed.

Part of the wall between the teeth had been lost, so reinforcement of the wider restoration was considered.

Remaining tooth after decay removal.
Remaining tooth after decay removal.

Polyethylene fibre reinforcement

Polyethylene fibre was placed within the resin according to the remaining tooth and restoration extent. It can help reinforce a wider restoration and distribute forces.

Fibre is selected according to decay, remaining tooth and the bite; it is not used in every resin treatment.

Polyethylene fibre positioned to reinforce the restoration.
Polyethylene fibre positioned to reinforce the restoration.

Recreating contacts and the chewing surface

Resin was built up in stages after fibre placement to restore contact between the teeth and the chewing surface.

Tooth form restored with fibre and resin while the rubber dam remained in place.
Tooth form restored with fibre and resin while the rubber dam remained in place.

Final contact and bite checks

Restoring the contact helps limit recurrent food trapping, while the chewing surface should transfer forces appropriately.

After removing the rubber dam, restoration shape, contacts and the bite were checked.

Final view after rubber dam removal and contact and bite checks.
Final view after rubber dam removal and contact and bite checks.

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This clinical journal describes an actual treatment case with identifying information excluded.

Treatment methods, duration, and outcomes may vary according to general health, oral condition, bone, bite, and maintenance needs.

This page provides general medical information and does not replace an individual examination or diagnosis.

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