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Smoking may weaken dental fillings, new study suggests

NCT ID NCT04807465

Knowledge-focused Sponsor: Hacettepe University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looks at whether smoking changes how well a universal dental adhesive works when repairing tooth cavities near the gum line. Researchers tested three different ways of applying the adhesive in 47 adults who smoke at least 10 cigarettes a day. The goal is to see if smoking affects how long the filling lasts, its color, and sensitivity.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
G-Premio Bond dental adhesive
What this could lead to
If successful, this study could help dentists choose the best adhesive application method for smokers, improving dental restoration longevity.
What could go wrong
This is a small, early-stage study with only 47 participants, so results may not apply to all smokers or dental situations. It does not test a new treatment or cure.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

47 people

The number who actually took part.

Started

Sep 2018

Expected to finish

Jan 2028

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 75 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients were 18 years of age or older, * good general health, * acceptable oral hygiene level, * no possible health problems (such as allergies) related to resin-based restorations, * at least three non-carious cervical lesions with at least 20 teeth in the occlusion. * The depth of the lesions should be at least 1 mm, without carious, not previously restored, having teeth with vital, enamel and dentin tissue. * Patients who smoke at least 10 cigarettes per day, however patients in non-smokers have never smoked before. Exclusion Criteria: * Participant had fewer than 20 teeth, * having poor oral hygiene, * uncontrolled periodontal disease, * xerostomia, * diagnosis of bruxism, * pregnancy or breastfeeding possible health problems (such as allergy) related to resin-based restorations * having severe systemic disease, * having bleaching treatment or orthodontic treatment.

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Conditions

The condition(s) this trial relates to.

Smoking

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Healthy participant

Contacts and locations

Locations

  • Hacettepe University Faculty of Dentistry

    Ankara, 06100, Turkey (Türkiye)

More trials for these conditions

Other studies related to the condition(s) this trial covers.