An interventional study of Multilayer Zirconia Crowns and Feldspathic Veneered Zirconia Crowns in Color Stability of Dental Ceramics, Zirconia Restorations and Khat Chewing Effects, sponsored by Thamar University. Active, not recruiting at 1 site in Yemen. Open to participants aged 18 Years to 60 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-08-25.
Sponsored by Thamar University · Not applicable, Interventional, and Treatment
This study aims to evaluate and compare the impact of khat chewing on the color stability and patient satisfaction of multilayer zirconia and feldspathic veneered zirconia restorations. A split-mouth clinical trial design is utilized to assess color changes using a spectrophotometer and patient satisfaction via a structured questionnaire over the follow-up period.
877 studies on the registry are indexed under Patient Satisfaction; 202 are open to participants now.
This study's planned enrollment of 10 is below the median of 96 across 624 interventional studies indexed under Patient Satisfaction.
Browse Patient Satisfaction studies →Thamar University is the lead sponsor of 3 studies on the registry; 1 is open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Restorations fabricated using multilayer zirconia in one arch.
Device: Multilayer Zirconia Crowns
Restorations fabricated using feldspathic veneered zirconia in the opposing arch.
Device: Feldspathic Veneered Zirconia Crowns
Multilayered zirconia restorations placed in one arch.
Feldspathic veneered zirconia Restorations Placed in the opposing arch.
Color stability
Assessment of color change (delta E) of the restorations measured using a spectrophotometer.
Time frame: Baseline, 3 months, and 6 months
Patient Satisfaction
Evaluation of patient satisfaction with aesthetic appearance and overall restoration outcome measured using a standardized questionnaire or Visual Analog Scale (VAS).
Time frame: 6 months
Plan to share: No — Individual participant data will not be shared to protect participant privacy and maintain confidentiality.
No publications or documents are linked to this record.
This study is active, not recruiting, as verified in Aug 2026. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Thamar University