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Outcome Measures

Primary Outcomes (1)

Number and Proportion of Successful Onlay Restorations in Posterior Endodontically Treated Teeth Assessed by the Modified United States Public Health Service (USPHS) Criteria
Posterior endodontically treated teeth restored with zirconia, lithium disilicate, or zirconia-reinforced lithium disilicate onlays are evaluated by two independent examiners using modified USPHS criteria across 8 parameters: marginal discoloration, secondary caries, marginal integrity, surface texture, restoration fracture, occlusal wear, color match, and aesthetic anatomic form. Each parameter rated Alpha (clinically ideal), Bravo (minor complication, clinically acceptable), or Charlie (major complication requiring renewal). Failure if Charlie on any single parameter. Data will be analyzed using Kaplan-Meier survival estimation. Outcome reported as absolute count and percentage (%) of successful restorations, stratified by material group. Higher percentage indicates better outcome.
6 months and 12 months post-cementation

Secondary Outcomes (1)

Frequency and Distribution of Individual Modified USPHS Parameter Ratings (Failure Mode Analysis) Stratified by Onlay Material
6 months and 1 year post-cementation

Study Arms (3)

Monolithic Zirconia Onlays

EXPERIMENTAL

13 endodontically treated molars restored with monolithic zirconia partial-coverage onlays (Zolid Bion Multilayer). Tooth preparation: rounded shoulder finish line located supragingivally, minimum 1 mm axial reduction, 1.5-2 mm occlusal reduction.Finishing was completed with Al2O3 stones or rubber cups. Impressions were taken using digital scanning technology. Temporary fabrication: The abutment teeth were temporarily restored using Acrytemp (Zhermack, Italy) and temporarily cemented with 3MTM RelyXTM Temp NE Zinc Oxide Non-Eugenol Temporary Cement (3M, Germany).

Device: Monolithic zirconia partial coverage onlays

Lithium Disilicate Onlays

ACTIVE COMPARATOR

13 endodontically treated molars restored with lithium disilicate glass-ceramic onlays (IPS e.max Press). Tooth preparation: rounded shoulder finish line located above the cemento-enamel junction (CEJ), 1.5 mm axial reduction, 2 mm occlusal reduction, rounded internal line angles, 90° cavosurface angles. Finishing was completed with Al2O3 stones or rubber cups. Impressions were taken using digital scanning technology. Temporary fabrication: The abutment teeth were temporarily restored using Acrytemp (Zhermack, Italy) and temporarily cemented with 3MTM RelyXTM Temp NE Zinc Oxide Non-Eugenol Temporary Cement (3M, Germany).

Interventions

Monolithic zirconia partial coverage onlaysDevice

Endodontically treated molars restored with adhesive onlays. For the monolithic zirconia, material-specific intaglio surface treatments are applied prior to cementation: zirconia onlays receive tribochemical silica-coating with 30µm alumina-coated silica particles (CoJet Sand) at 2.5 bar for 20 seconds, followed by Z-Prime Plus and Ceramic Primer Plus (Clearfil™). Teeth were isolated using rubber dam and Tooth Primer were applied for dentin/enamel. All restorations are definitively cemented with MDP-based dual-cure resin cement (Panavia V5, Kuraray Dental). Restorations are seated, tack-cured, and isolated for 3 minutes.

Also known as: Adhesive resin cement; USPHS criteria; Clinical performance.

Monolithic Zirconia Onlays

Lithium disilicate partial coverage onlays

Study Design

Study Type

interventional

Phase

not applicable

Allocation

RANDOMIZED

Masking

DOUBLE

Who Masked

PARTICIPANT, OUTCOMES ASSESSOR

Purpose

TREATMENT

Intervention Model

PARALLEL

Model Details: This was a three-arm, parallel-group, randomized controlled trial. The individual molar tooth served as the unit of randomization. The two evaluating examiners were blinded to the material assignment and were not present during cementation or occlusal adjustments; only the treating prosthodontist was unblinded to the intervention. Clinical outcomes were assessed prospectively at 6 months and 1 year using modified USPHS criteria."

Sponsor Type

OTHER

Responsible Party

SPONSOR INVESTIGATOR

PI Title

Assistant professor

An In-vivo Survival Rate of Different Onlay Materials Placed Over Endodontically Treated Molar Teeth

Brief Summary

Registry Overview

Trial Relationships

Study Timeline

Study Start

Primary Completion

First Submitted

First Posted

Study Completion

Conditions

Keywords

Outcome Measures

Primary Outcomes (1)

Secondary Outcomes (1)

Study Arms (3)

Monolithic Zirconia Onlays

Lithium Disilicate Onlays

Interventions

Eligibility Criteria

You may qualify if:

Sponsors & Collaborators

Study Sites (1)

Study Officials

Enrollment

Study Design

Study Record Dates

Zirconia-Reinforced Lithium disilicate Onlays

You may not qualify if:

Data Sharing

Source record

Locations

Brief Summary

Registry Overview

Trial Relationships

Related Scientific Literature

Study Timeline

Study Start

Primary Completion

First Submitted

First Posted

Study Completion

Conditions

Keywords

Outcome Measures

Primary Outcomes (1)

Secondary Outcomes (1)

Study Arms (3)

Monolithic Zirconia Onlays

Lithium Disilicate Onlays

Interventions

Eligibility Criteria

You may qualify if:

Sponsors & Collaborators

Study Sites (1)

Study Officials

Enrollment

Study Design

Study Record Dates

Zirconia-Reinforced Lithium disilicate Onlays

You may not qualify if:

Data Sharing

Source record

Locations