Dental showdown: onlays vs crowns for saving decayed teeth
NCT ID NCT07259265
First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This completed study looked at 120 adults with decayed premolars or molars to compare how long onlays and single crowns last, and how well they work. Participants received either a crown or an onlay made from different ceramic materials. The goal was to see which restoration type and material leads to fewer fractures, maintains tooth vitality, and avoids further decay over time.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- What this could lead to
- If successful, this study could help dentists choose the best type of dental restoration (onlay or crown) for decayed back teeth, improving long-term tooth survival.
- What could go wrong
- This is a completed observational study, so results are already in. However, findings may not apply to all patients or dental practices, and no new treatment is being tested.
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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120 people
The number who actually took part.
- Started
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Mar 2019
- Finished
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Feb 2024
- 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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18 to 80 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: * • Subjects with the need for a fixed reconstruction in premolar and molar region with indication for either crown or onlay. * min. 18 years of age and ≤ 80 years * Patient with physical status PS1 and PS2 (according to Physical Status Classification System of the American Society of Anesthesiologists; Attachment 5) * Capable of providing written informed consent * Absence of any active periodontal and pulpal disease Exclusion Criteria: * Presence of conditions requiring chronic routine prophylactic use of antibiotics or prolonged use of steroids e.g. history of rheumatic heart disease, bacterial endocarditis, cardiac vascular anomalies, prosthetic joint replacements, etc. * Patients with history of renal failure, bleeding disorders, metabolic bone disorder, uncontrolled endocrine disorders, HIV infection, Hepatitis * History of neoplastic disease requiring the use of radiation or chemotherapy * Inability to perform adequate oral hygiene * Significant reduced saliva flow rate * Unable or unwilling to cooperate for the trial period * Allergy to any components of the reconstruction materials and cements * Alcohol or drug abuse * Pregnant or lactating women Specific criteria: * Root caries / root canal caries * Extreme short dental arch (eSDA) * Severe bruxism or clenching habits
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Conditions
The condition(s) this trial relates to.
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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University of Geneva
Geneva, Canton of Geneva, 1204, Switzerland