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

NCT07753941 · Status: ACTIVE_NOT_RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 39

Last updated 2026-08-10

No results posted yet for this study

Summary

This study aims to evaluate the survival rates of onlays placed over posterior endodontically treated teeth restored with zirconia, lithium disilicate and lithium disilicate reinforced with zirconia. Additionally, it seeks to identify and assess the failure modes associated with these types of restorations.

Conditions

  • Dental Restoration Failures

Interventions

DEVICE

Monolithic zirconia partial coverage onlays

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.

DEVICE

Lithium disilicate partial coverage onlays

Endodontically treated molars restored with adhesive onlays. For the Lithium disilicate (IPS e.max Press), material-specific intaglio surface treatments are applied prior to cementation: Onlays receive 9% hydrofluoric acid etching, washing, drying, and application of 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 (or light-cured for translucent onlays).

DEVICE

zirconia-reinforced lithium disilicate partial coverage onlays

Endodontically treated molars restored with adhesive onlays. For the zirconia-reinforced lithium disilicate onlays (Vita Ambria), material-specific intaglio surface treatments are applied prior to cementation: Onlays receive 9% hydrofluoric acid etching, washing, drying, and application of 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 (or light-cured for translucent onlays).

Sponsors & Collaborators

  • Yousef Mahmoud Salem

    lead OTHER

Principal Investigators

  • Yousef Salem · Jordan University of Science and Technology

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Model
PARALLEL

Eligibility

Min Age
17 Years
Max Age
60 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2025-09-01
Primary Completion
2026-06-01
Completion
2027-06-01

Countries

  • Jordan

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07753941 on ClinicalTrials.gov