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Prosthetic Complications in Full-arch Screw-retained Implant Restorations Using Monolithic Zirconia Versus Titanium Frameworks: A Randomized Clinical Trial

14. juni 2026 opdateret af: Ahmad Diab Ahmad ElSayed, Cairo University
The goal of this clinical trial is to to compare the prosthetic complication rate and Oral Health-Related Quality of Life (OHRQoL) between screw-retained monolithic zirconia frameworks and CNC-milled titanium frameworks with zirconia superstructures in completely edentulous patients restored with full-arch implant-supported prostheses over a follow-up period of 12 months.

Studieoversigt

Status

Rekruttering

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Anslået)

12

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Egypten
      • Cairo, Egypten, 11553
        • Rekruttering
        • Faculty of Dentistry - Cairo University
        • Kontakt:

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ingen

Beskrivelse

Inclusion Criteria:

  1. Aged 18 years or older.
  2. Able to understand the study procedures and provide written informed consent.
  3. In good general health, classified as American Society of Anesthesiologists (ASA) Physical Status Class I or II.
  4. Completely edentulous in the arch to be treated (maxilla and/or mandible).
  5. A candidate for a full-arch, screw-retained implant-supported prosthesis, requiring 4 to 6 implants in the treatment arch.
  6. Sufficient bone volume at planned implant sites to place implants of at least 3.5mm in diameter and 8mm in length.
  7. Adequate crown height space (15-22 mm) for a fixed prosthesis.
  8. A zone of keratinized mucosa at the crest of the ridge measuring at least 2 mm in width.
  9. Opposing arch is fixed full-arch implant-supported prosthesis.
  10. Demonstrates acceptable oral hygiene and the motivation to maintain it.

Exclusion Criteria:

  1. Medical contraindications:

    • Uncontrolled diabetes (HbA1c > 7.0%).
    • History of radiotherapy in the head and neck region.
    • History of intravenous bisphosphonate therapy.
    • Immunosuppressed or immunocompromised status.
    • Any other uncontrolled systemic disease that constitutes a contraindication for oral surgery.

  2. Behavioral Factors:

    • Heavy smoking, defined as consumption of more than 10 cigarettes per day.
    • Presence of parafunctional habits (e.g., bruxism, clenching) as diagnosed by clinical examination.

  3. Local Oral Factors:

    • Active, untreated periodontal disease in any remaining dentition.
    • Presence of acute oral infection or pathology at the intended surgical site.
    • Crown height space less than 15 mm or more than 22 mm.
    • Insufficient keratinized mucosa (< 2 mm width) that cannot be corrected with a simple surgical procedure prior to implant placement.

  4. General:

    • Pregnancy or lactation.
    • Participation in another interventional clinical trial.
    • Perceived inability to comply with the study protocol and follow-up schedule.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Monolithic zirconia framework
The prosthesis is a one-piece, full-arch framework milled from a single, monolithic zirconia blank. It includes the infrastructure, prosthetic teeth, and gingival contours. The prosthesis is screw-retained directly to multi-unit abutments.
Andet: Monolithic Zirconia Prosthesis

Intervention: Screw-Retained Monolithic Zirconia Prosthesis

  • Components: The prosthesis is a one-piece, full-arch framework milled from a single, monolithic zirconia blank. It includes the infrastructure, prosthetic teeth, and gingival contours. The prosthesis is screw-retained directly to multi-unit abutments. The prosthesis is delivered on the day of final insertion and is intended to be a definitive, long-term restoration.

  • Procedure for Tailoring: The prosthesis is fully customized for each participant using a digital workflow:

    1. Digital Impression: An intraoral scan (Medit i700 scanner ) of the multi-unit abutment scan bodies will be performed.
    2. Prosthesis Design: The prosthesis will be digitally designed in the CAD software BlenderforDental .
    3. Fabrication: The design file will be processed in Millbox CAM software and milled from a zirconia blank using a 5-axis milling machine.
Andre navne:
  • Screw-Retained Monolithic Zirconia Prosthesis
Aktiv komparator: CNC-milled titanium framework and zirconia superstructure

The prosthesis consists of two parts: A CNC-milled titanium framework, and a CNC-milled zirconia superstructure that is cemented onto the framework.

The titanium framework is screw-retained directly to multi-unit abutments. The zirconia superstructure is permanently cemented to the framework with resin cement.
Andet: CNC-milled titanium framework and zirconia superstructure
The prosthesis consists of two parts: A CNC-milled titanium framework, and a CNC-milled zirconia superstructure that is cemented onto the framework. The titanium framework is screw-retained directly to multi-unit abutments. The zirconia superstructure is permanently cemented to the framework with resin cement.
Andre navne:
  • CNC-milled titanium framework

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Prosthetic complications
Tidsramme: 1 year
The primary outcome of this study is the incidence of prosthetic complications over 12-month follow-up period. A prosthetic complication is defined as any mechanical or technical issue affecting the prosthesis that requires clinical intervention. This will be assessed through a standardized clinical examination conducted by a calibrated examiner. The outcome for each participant will be recorded as a binary variable (Yes/No).
1 year

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Oral Health-Related Quality of Life (OHRQoL)
Tidsramme: 1 year
The secondary outcome of this study is the change in Oral Health-Related Quality of Life (OHRQoL) over the 12-month follow-up period. This will be measured using the validated Arabic version of the 5-item Oral Health Impact Profile (OHIP5-Ar) questionnaire (Alhajj et al., 2019). The questionnaire consists of 5 questions, each rated on a Likert scale (e.g., 0 = Never, 1 = Hardly ever, 2 = Occasionally, 3 = Fairly often, 4 = Very often). The total score ranges from 0 to 20, with a higher score indicating a greater negative impact on OHRQoL. The change from baseline to 3, 6 and 12 months will be analyzed.
1 year

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Cairo University

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

12. april 2026

Primær færdiggørelse (Anslået)

1. maj 2027

Studieafslutning (Anslået)

1. maj 2027

Datoer for studieregistrering

Først indsendt

14. juni 2026

Først indsendt, der opfyldte QC-kriterier

14. juni 2026

Først opslået (Faktiske)

18. juni 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

18. juni 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

14. juni 2026

Sidst verificeret

1. april 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 09062026

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

Kliniske forsøg med Monolithic Zirconia Prosthesis

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Sponsorer og samarbejdspartnere

Medicinske tilstande

Narkotikainterventioner

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Betingelser

Sjældne sygdomme

Narkotikainterventioner

Kosttilskud

Sponsor / samarbejdspartnere

Placeringer

Abonner