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Clinical Evaluation of Two Post Systems for Single Crown Restoration of Anterior Teeth: A Randomized Controlled Clinical Trial

14. september 2026 oppdatert av: Mohamed el sayed bekhiet, Cairo University
This randomized controlled trial evaluates two post systems used to restore endodontically treated (root canal treated) maxillary anterior teeth with 1-2 missing coronal walls. Participants will be randomly assigned to receive either a custom-adapted polyethylene fibers post (Ribbond-type, individually formed) or a prefabricated fiber post, followed by a composite core and crown restoration. The primary outcome is the distance between the post and the remaining root canal filling (gutta-percha), measured radiographically, which reflects how well the post adapts within the canal. The secondary outcome is post and restoration retention, assessed clinically using USPHS criteria. Participants will be followed for 6 months. The study aims to determine whether a custom-fitted fiber post provides better adaptation and retention compared to a standard prefabricated fiber post in teeth with significant structural loss.

Studieoversikt

Status

Har ikke rekruttert ennå

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

Endodontically treated maxillary anterior teeth frequently present with significant loss of coronal tooth structure, compromising their resistance to fracture and complicating restoration. prefabricated fiber posts are widely used to retain a composite core prior to crown placement, but the degree to which a post adapts to the internal canal wall - leaving minimal or no gap between the post and the remaining gutta-percha - may influence long-term clinical performance and resistance to microleakage.

This study is a randomized controlled trial comparing a custom-adapted ultra-high-molecular-weight polyethylene (UHMWPE) fibers post (Ribbond-type), individually formed to the canal anatomy, against a prefabricated fiber post. Eligible teeth are endodontically treated maxillary anterior teeth with 1-2 missing coronal axial walls (mesial, distal, labial, and/or palatal), assessed at the cementoenamel junction, where any remaining sound walls meet a minimum height of 1.5-2 mm and a circumferential thickness of approximately 1 mm, in line with established ferrule criteria.

Participants will be randomly allocated to receive either the Ribbond post or the prefabricated fiber post, followed by a standardized composite core build-up and definitive crown restoration. Post space preparation, dentin conditioning, and cementation will follow a standardized step-by-step clinical protocol for each group.

The primary outcome is the post-gutta-percha gap distance, measured radiographically and expressed continuously in millimeters, with cases additionally classified as showing no gap versus any measurable gap. This dichotomization and its expected baseline distribution are informed by prior clinical data reporting outcomes in maxillary anterior teeth. The secondary outcome is post and restoration retention, evaluated clinically at follow-up using USPHS criteria.

Studietype

Intervensjonell

Registrering (Antatt)

84

Fase

  • Ikke aktuelt

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Studiesteder

  • Egypt
    • Manial
      • Cairo, Manial, Egypt, 11553

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

  • Voksen

Tar imot friske frivillige

Nei

Beskrivelse

Inclusion Criteria:

  • Endodontically treated maxillary anterior teeth (incisors and/or canines)
  • Presence of 1-2 missing coronal axial walls (mesial, distal, labial, and/or palatal), assessed at the cementoenamel junction (CEJ)
  • Remaining sound tooth structure meeting minimum ferrule criteria: wall height ≥1.5-2 mm and circumferential thickness ≈1 mm
  • Adequate root canal filling with no radiographic signs of periapical pathology
  • Root length and canal morphology suitable for post space preparation
  • Patients aged 20-40 years
  • Willing and able to provide informed consent and attend follow-up visits

Exclusion Criteria:

  • Teeth with 3 or more missing coronal axial walls (insufficient ferrule)
  • Evidence of active periapical pathology, root fracture, or root resorption
  • Insufficient remaining root length for adequate post retention
  • Signs of periodontal disease affecting tooth prognosis (e.g., mobility, inadequate periodontal support)
  • Systemic conditions contraindicating routine dental treatment
  • Pregnancy (if radiographic follow-up is required)
  • Inability to attend scheduled follow-up visits

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Behandling
  • Tildeling: Randomisert
  • Intervensjonsmodell: Parallell tildeling
  • Masking: Enkelt

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Aktiv komparator: Prefabricated Fiber Post with Composite Core
Participants receive a prefabricated fiber post, followed by a composite core build-up and definitive crown restoration.
Annen: Custom-Fit UHMWPE Fiber Post with Composite Core
Participants receive a custom-fit UHMWPE fiber post, individually adapted to the canal at chairside, followed by a composite core build-up and definitive crown restoration.
Eksperimentell: Custom-Fit UHMWPE Fiber Post with Composite Core
Participants receive a custom-fit UHMWPE fiber post, individually adapted to the canal at chairside, followed by a composite core build-up and definitive crown restoration.
Annen: Custom-Fit UHMWPE Fiber Post with Composite Core
Participants receive a custom-fit UHMWPE fiber post, individually adapted to the canal at chairside, followed by a composite core build-up and definitive crown restoration.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Post-Gutta-Percha Gap Distance
Tidsramme: Immediately post-cementation (baseline)
Distance between the outer surface of the cemented post and the residual root canal filling (gutta-percha), measured radiographically at the coronal, middle, and apical thirds of the post space. Reported both as a continuous measurement (mm) and dichotomized as no gap versus any measurable gap.
Immediately post-cementation (baseline)

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Post and Restoration Retention
Tidsramme: 6 months post-cementation
Clinical retention of the post-core-crown restoration, assessed using United States Public Health Service (USPHS) criteria.
6 months post-cementation

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Cairo University

Etterforskere

  • Studieleder: Mohamed labib zamzam, PHD, Fixed Prosthodontics Faculty of Oral and dental medicine Cairo University
  • Studiestol: omnia nabil, PHD, Fixed Prosthodontics Faculty of Oral and dental medicine Cairo University

Publikasjoner og nyttige lenker

Den som er ansvarlig for å legge inn informasjon om studien leverer frivillig disse publikasjonene. Disse kan handle om alt relatert til studiet.

Generelle publikasjoner

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Antatt)

2. oktober 2026

Primær fullføring (Antatt)

1. februar 2027

Studiet fullført (Antatt)

1. mars 2027

Datoer for studieregistrering

Først innsendt

14. september 2026

Først innsendt som oppfylte QC-kriteriene

14. september 2026

Først lagt ut (Faktiske)

18. september 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

18. september 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

14. september 2026

Sist bekreftet

1. september 2026

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Andre studie-ID-numre

  • CEBD-CU-2025-07-29

Plan for individuelle deltakerdata (IPD)

Planlegger du å dele individuelle deltakerdata (IPD)?

NEI

Legemiddel- og utstyrsinformasjon, studiedokumenter

Studerer et amerikansk FDA-regulert medikamentprodukt

Nei

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

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