NCT07456995

Evaluation of Mandibular Posterior Zirconia Crowns With Different Ti-Base Surface Treatments.

Clinical Evaluation of Mandibular Posterior Screw-retained Zirconia Crown With Various Ti-Base Abutment Surface Treatments: Randomized Controlled Clinical Trial

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 27 (actual)
• Sponsor: October University for Modern Sciences and Arts · Academic / Other
• Sex: All
• Age: 18 Years – 55 Years
• Healthy volunteers: Accepted

Summary

This clinical trial evaluates how different surface treatments on a metal base (Ti-Base) affect the success of dental crowns on implants. Patients receiving a zirconia crown for a missing lower back tooth are divided into three groups: one group receives no special treatment on the metal base, one group receives a silica coating, and the third receives both a silica coating and a chemical primer. The study monitors these crowns for one year to see which treatment best prevents the crown from coming loose or breaking, while also checking the health of the surrounding gums.

Detailed description

This is a three-arm, parallel-group, superiority randomized controlled trial. The research question addresses the impact of silica coating (CoJet Sand) and primer (Z-Prime Plus) on the survival of mandibular posterior screw-retained zirconia crowns.+3The primary intervention involves treating the titanium base (Ti-Base) abutment surface using 30-mm $SiO\_2-Al\_2O\_3$ particles at 2.0 bar pressure. The three groups are:Group I (Control): No surface treatment.Group II: Tribochemical silica coating alone.Group III: Tribochemical silica coating followed by Z-Prime Plus application.Survival is evaluated using modified United States Public Health Service (USPHS) criteria at baseline, 6 months, and 12 months. Biological health is assessed via the modified plaque index (mPI) and modified Sulcus Bleeding Index (mSBI).

Conditions

• Jaw, Edentulous, Partially
• Tooth Loss
• Molar Teeth
• Dental Implant

Interventions

Type	Name	Description
DEVICE	Tribochemical silica coating.	Surface treatment of titanium base implant abutment using 30 um SiO2 - Al2O3 particles at 2.0 bar pressure.
DEVICE	Tribochemical silica coating and Z-Prime Plus.	Surface treatment of titanium base implant abutment using 30 um SiO2 - Al2O3 particles at 2.0 bar pressure, followed by the application of Z-Prime Plus primer.

Timeline

• Start date: 2025-01-08
• Primary completion: 2026-01-12
• Completion: 2026-02-12
• First posted: 2026-03-09
• Last updated: 2026-03-09

Locations

1 site across 1 country: Egypt