Clinical Behavior and Patient Satisfaction of Zirconia-reinforced Glass-ceramic Crowns and Ultra-translucent-multilayered Monolithic Zirconia Crowns With a Conservative Marginal Design

April 8, 2026 updated by: Hanan Almudahka, Cairo University

Clinical Behavior and Patient Satisfaction of Zirconia-reinforced Glass-ceramic Crowns and Ultra-translucent-multilayered Monolithic Zirconia Crowns With a Conservative Marginal Design (A Randomized Controlled Clinical Trial)

The aim of the present study is to evaluate clinical behavior and patient satisfaction of Zirconia-reinforced lithium disilicate press ceramic crowns when used in a conservative marginal design(0.6mm chamfer finish line). Comparison with Ultratranslucent multilayered monolithic zirconiacrowns will also be carried out in terms of marginal integrity, fracture, color stability and gingival health for 12 month

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

  • Select and examine patients based on inclusion/exclusion criteria, then obtain consent.
  • Diagnose chief complaint, assess teeth in the esthetic zone, and perform scaling/polishing.
  • Take primary impressions for study casts.
  • Instruct patients to brush three times daily for good oral hygiene.
  • Capture pre-op photos and radiographs.
  • Choose the appropriate shade.

  • Tooth Preparation:

    • Group 1: Ultra-translucent zirconia crown (CAD/CAM, 0.6mm chamfer).
    • Group 2: Zirconia-reinforced lithium disilicate crown (press, 0.6mm chamfer).
  • Perform tissue retraction and take impressions with IOS.
  • Create provisional crowns.
  • Fabricate crowns (AMBRIA or KATANA zirconia) per manufacturer guidelines.
  • Conduct try-in.
  • Cement using light-cured resin adhesive.
  • Assess restoration at 3, 6, 9 and 12 months for clinical behavior and patient satisfaction

Study Type

Interventional

Enrollment (Estimated)

20

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. The age range of the patients from 21- 50 years old; able to read and sign the informed consent document; illiterate patients will be avoided.
  2. Patients who can physically and psychologically tolerate conventional restorative procedures.
  3. Patients with endodontically treated teeth indicated for ceramic crowns in the esthetic Zone (all axial walls existing).
  4. Patients with no active periodontal or pulpal diseases.
  5. Patients with teeth problems indicated for full coverage restoration in the esthetic zone (e.g.

moderate to severe discoloration, coronal chipping where partial coverage would lack retention, malposed or malformed teeth). 6. Patients willing to return for follow-up examinations and evaluation. 7. Patients that care for good oral hygiene Maintenance.

Exclusion Criteria:

1 Patients with poor oral hygiene and motivation. 2. high caries rate. 3. Patients with psychiatric problems or unrealistic expectations (patient that has phobia from dental treatments or needle bunch). 4. Patients suffering from parafunctional habits or temporomandibular disorders.

7. Patients with teeth have extensive tooth structure loss, even if one wall is missing.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: UTML (KATANA) crowns arm
Patients will receive ultra-translucent multilayered monolithic zirconia crowns ( KATANA UTML) fabricated using CAD/CAM with conservative marginal design (0.6 mm).
Device: UTML (KATANA) crowns with conservative marginal design
Monolithic zirconia (KATANA UTML) crown fabricated with CAD/CAM and a conservative 0.6 mm marginal design.
Experimental: ZLS crowns arm
Patients will receive zirconia-reinforced lithium silicate press ceramic crowns ( VITA Ambria) with conservative marginal design (0.6 mm).
Device: ZLS (AMBRIA) crowns with conservative marginal design
Zirconia-reinforced lithium silicate press ceramic (Ambria) crown with conservative 0.6 mm marginal design.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
clinical behavior
Time Frame: 12 months follow-up interval

Marginal integrity:

Measuring device: Modified USPHS criteria. Measuring unit: Discrete (scores).
12 months follow-up interval
Fracture:
Time Frame: Time Frame: 12 months follow-up interval.
Description: Measuring device: Modified USPHS criteria Measuring unit: Discrete (scores).
Time Frame: 12 months follow-up interval.
Color stability:
Time Frame: Time Frame: 12 months follow-up interval
Description: Measuring device: Spectrophotometer Measuring unit: ΔE.
Time Frame: 12 months follow-up interval
Gingival health:
Time Frame: 12 months follow-up interval
Measuring device: Gingival index & Bleeding on probing (BOP) Measuring unit: (scores).
12 months follow-up interval

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
patient satisfaction by Visual analogue Scale (VAS)
Time Frame: 12 months follow-up interval
Numerical (0) unsatisfied (10) satisfied
12 months follow-up interval

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Cairo University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

June 1, 2026

Primary Completion (Estimated)

July 1, 2027

Study Completion (Estimated)

July 1, 2027

Study Registration Dates

First Submitted

March 5, 2026

First Submitted That Met QC Criteria

April 8, 2026

First Posted (Actual)

April 13, 2026

Study Record Updates

Last Update Posted (Actual)

April 13, 2026

Last Update Submitted That Met QC Criteria

April 8, 2026

Last Verified

September 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 10 7 25

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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