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

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)

Status

Not yet recruiting

Phases

Unknown

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT07521501

Enrollment

Registered

2026-04-13

Start date

2026-06-01

Completion date

2027-07-01

Last updated

2026-04-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Clinical Behavior of ZLS and UTML

Keywords

KATANA (UTML zirconia), AMBRIA (zirconia reinforced glass ceramic), clinical behavior, patient satisfaction, conservative marginal design

Brief summary

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

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

Interventions

DEVICEUTML (KATANA) crowns with conservative marginal design

Monolithic zirconia (KATANA UTML) crown fabricated with CAD/CAM and a conservative 0.6 mm marginal design.

DEVICEZLS (AMBRIA) crowns with conservative marginal design

Zirconia-reinforced lithium silicate press ceramic (Ambria) crown with conservative 0.6 mm marginal design.

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

DOUBLE (Subject, Outcomes Assessor)

Eligibility

Sex/Gender

ALL

Age

21 Years to 50 Years

Healthy volunteers

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.

Design outcomes

Primary

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

Secondary

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

Contacts

CONTACTHanan Ibrahim AL-Mudahka

hanan.almudahka@dentistry.cu.edu.eg00201044511118/ 0097455466442

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Apr 14, 2026