Impact of Khat Chewing on Color Stability and Patient Satisfaction of Multilayer Zirconia and Feldspathic Veneer Zirconia.

NCT07786272 | Active Not Recruiting

• 1 other identifier: EC/FD/2025/005
• Study Type: interventional
• Target: 10
• Locations: 1 country
• Sites: 1

Brief Summary

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.

Conditions

Color Stability of Dental Ceramics; Zirconia Restorations; Khat Chewing Effects; Dental Restoration Staining

Keywords

Multilayer Zirconia; Feldspathic Veneered Zirconia; Split-Mouth Study; Spectrophotometer; Patient Satisfaction

Outcome Measures

Primary Outcomes (1)

• Color stability

  Assessment of color change (delta E) of the restorations measured using a spectrophotometer.

  Baseline, 3 months, and 6 months

Secondary Outcomes (1)

• Patient Satisfaction

  6 months

Study Arms (2)

Multilayer Zirconia Group

EXPERIMENTAL

Restorations fabricated using multilayer zirconia in one arch.

Device: Multilayer Zirconia Crowns

Feldspathic Veneered Zirconia Group

ACTIVE COMPARATOR

Restorations fabricated using feldspathic veneered zirconia in the opposing arch.

Device: Feldspathic Veneered Zirconia Crowns

Interventions

Multilayer Zirconia Crowns DEVICE

Multilayered zirconia restorations placed in one arch.

Multilayer Zirconia Group

Feldspathic Veneered Zirconia Crowns DEVICE

Feldspathic veneered zirconia Restorations Placed in the opposing arch.

Feldspathic Veneered Zirconia Group

Eligibility Criteria

• Age: 18 Years - 60 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Age \> 18 years old.
• Participants required crowns with proper endodontic treatment.
• Participants with stable normal occlusion.
• Khat chewer.
• Participants required crowns for posterior teeth (premolar and molar) in the side of khat chewing.
• Participants with extensive decay, cracks, or large restorations that necessitate a crown.
• Participants wishing to improve the appearance of discolored or damaged teeth may be suitable candidates for crowns.
• Good oral hygiene.
• Availability for follow-up

You may not qualify if:

• Participants with high caries index.
• Participants with parafunctional habits as clenching/bruxism.
• Severe periodontal disease.
• Participants not indicated for crowns.
• Allergy to materials.

Sponsors & Collaborators

• Thamar University: lead

Study Sites (1)

Thamar University , Faculty of Dentistry

Dhamar, Yemen

Location

MeSH Terms

Conditions

Patient Satisfaction

Condition Hierarchy (Ancestors)

Treatment Adherence and Compliance; Health Behavior; Behavior

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: PARTICIPANT, OUTCOMES ASSESSOR
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Master candidate , Department of Prosthodontics , Faculty of Dentistry

Model Details: This is a split-mouth clinical trial. Each participant receives both restoration types simultaneously on the same side: multilayer zirconia in one arch (maxillary or mandibular) and feldspathic veneered zirconia in the opposing arch, assigned randomly.

Study Record Dates

• First Submitted: August 21, 2026
• First Posted: August 25, 2026
• Study Start: January 1, 2026
• Primary Completion (Estimated): February 1, 2027
• Study Completion (Estimated): March 12, 2027
• Last Updated: August 25, 2026

Record last verified: 2026-08

Data Sharing

• IPD Sharing: Will not share

Locations

YE (1)