Which dental onlay lasts longest after root canal? a Head-to-Head test
NCT ID NCT07753941
First seen Aug 10, 2026 · Last updated Aug 11, 2026 · Updated 1 time
Summary
This trial tests three types of tooth-colored onlays—zirconia, lithium disilicate, and zirconia-reinforced lithium disilicate—placed on molars that have had root canal treatment. It aims to see which material survives best and how they fail over time. Adults aged 17 to 60 with a treated molar and enough healthy tooth structure may join. The study tracks each restoration's success using standard dental criteria.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Dental onlays made of monolithic zirconia, lithium disilicate, or zirconia-reinforced lithium disilicate, placed with adhesive resin cement.
- What this could lead to
- If successful, this could identify the most durable onlay material for saving root-canal-treated molars, reducing the need for crowns or extractions.
- What could go wrong
- This is a small, early-stage study with 39 participants, so results may not apply broadly. Onlays can fail due to fracture, wear, or cement failure, and long-term outcomes are unknown.
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
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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
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39 people
The number who actually took part.
- Started
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Sep 2025
- Expected to finish
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Jun 2027
An estimate. End dates often move.
- Lead sponsor
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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
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17 to 60 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide 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: 1. Patients must have good general health. 2. Patients must be 17 to 60 years old. 3. Exclusively permanent molar teeth (first or second molars) needing restoration after endodontic therapy. 4. The tooth needs adequate residual structure to support an Onlay repair, with minimum of 50% of the coronal structure maintained. 5. Absence of Active Caries: The tooth and surrounding teeth ought to be free of illnesses or other agents compromising the restoration. 6. Endodontic Status: Radiographic evidence of adequate obturation and the lack of periapical pathology justify the excellent root canal treatment the tooth underwent. 7. The tooth and surrounding tissues must show periodontal stability free of evidence of active periodontal disease (probing depth \< 4 mm, lack of movement, and no bleeding following probing). 8. The tooth must be in functional occlusion or have a specified occlusal contact with the opposite dentition. 9. Patients must have good dental hygiene (plaque index than 20% and gingival index less than 1). 10. Participants must show that they are ready to follow the study plan, which calls for maintaining oral hygiene standards and showing attendance to follow-up visits. 11. Patients must provide written informed consent to be part in the study. Exclusion Criteria: 1. The tooth had past treatment with a crown or onlay. 2. Patients have any known allergies to the components utilized in the Onlay restoration-that is, composite resin, ceramic, or adhesive compounds. 3. Pregnant female participants 4. Patients have active periodontal disease 5. Teeth with vital pulp therapy
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Dental Teaching Clinics at Jordan University of Science and Technology
Irbid, 22110, Jordan