Can your crowns survive khat chewing? a dental showdown
NCT ID NCT07786272
First seen Aug 25, 2026 · Last updated Aug 26, 2026 · Updated 1 time
Summary
This trial compares two types of zirconia dental crowns—multilayer and feldspathic veneered—to see how well they resist color changes from khat chewing. Ten adults who chew khat and need crowns on their back teeth will receive one type of crown on one side of the mouth and the other type on the opposite side. Researchers will measure color changes with a spectrophotometer and ask participants about their satisfaction with the appearance. The goal is to determine which crown material maintains its color better under the staining effects of khat.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Multilayer zirconia crowns and feldspathic veneered zirconia crowns
- What this could lead to
- If successful, this could help dentists choose more stain-resistant crown materials for people who chew khat, improving long-term aesthetics and satisfaction.
- What could go wrong
- This is a very small early-stage study (10 participants), so results may not apply broadly. Color changes and satisfaction can vary widely between individuals, and the follow-up period may be too short to predict long-term staining.
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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About 10 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Jan 2026
- Expected to finish
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Mar 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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18 to 60 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
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. Age \> 18 years old. 2. Participants required crowns with proper endodontic treatment. 3. Participants with stable normal occlusion. 4. Khat chewer. 5. Participants required crowns for posterior teeth (premolar and molar) in the side of khat chewing. 6. Participants with extensive decay, cracks, or large restorations that necessitate a crown. 7. Participants wishing to improve the appearance of discolored or damaged teeth may be suitable candidates for crowns. 8. Good oral hygiene. 9. Availability for follow-up Exclusion Criteria: 1. Participants with high caries index. 2. Participants with parafunctional habits as clenching/bruxism. 3. Severe periodontal disease. 4. Participants not indicated for crowns. 5. Allergy to materials.
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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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Thamar University , Faculty of Dentistry
Dhamar, Yemen