An interventional study of Custom-Fit UHMWPE Fiber Post with Composite Core in Cairo University and Nonvital Tooth, sponsored by Cairo University. Not yet recruiting at 1 site in Egypt. Open to participants aged 20 Years to 40 Years. Per ClinicalTrials.gov, last updated 2026-10-20.
Sponsored by Cairo University · Not applicable, Interventional, and Treatment
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.
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.
111 studies on the registry are indexed under Tooth, Nonvital; 18 are open to participants now.
This study's planned enrollment of 84 is above the median of 50 across 101 interventional studies indexed under Tooth, Nonvital.
Browse Tooth, Nonvital studies →Cairo University is the lead sponsor of 4,941 studies on the registry; 1,458 are open to participants now.
Of its 37 completed or terminated interventional studies of FDA-regulated products, 5 (14%) have results posted.
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
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You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants receive a prefabricated fiber post, followed by a composite core build-up and definitive crown restoration.
Other: 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.
Other: 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.
Post-Gutta-Percha Gap Distance
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.
Time frame: Immediately post-cementation (baseline)
Post and Restoration Retention
Clinical retention of the post-core-crown restoration, assessed using United States Public Health Service (USPHS) criteria.
Time frame: 6 months post-cementation
Plan to share: No
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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