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RECRUITING Not applicable ClinicalTrials.gov

Passive Fit of Implant-Supported Frameworks: Digital vs Conventional Impressions

Sponsor: Mansoura University • ClinicalTrials.gov ID: NCT07778199

Registry updated: 2026-08-21
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Description

This randomized crossover clinical trial compares the passivity of fit of complete-arch mandibular implant-supported frameworks fabricated using three impression techniques: a non-calibrated splinted digital scan body system (IO-Connect), a Reverse Scan Body (RSB) digital impression technique, and a conventional splinted open-tray impression technique. Eight completely edentulous patients each receiving four mandibular implants will be included. Passivity of fit will be evaluated clinically using the Sheffield one-screw test and radiographically using intraoral periapical radiographs obtained with the parallel technique.

Interventions

  • IO-Connect Digital Impression (Procedure)
    Digital impression of the mandibular arch obtained using IO-Connect non-calibrated splinted scan bodies to fabricate the implant-supported framework for Group I.
  • Reverse Scan Body Digital Impression (Procedure)
    Digital impression obtained using the Reverse Scan Body (RSB) technique, involving extraoral scanning of scan bodies and superimposition with intraoral tissue scans, to fabricate the implant-supported framework for Group II.
  • Conventional Splinted Impression (Procedure)
    Conventional splinted open-tray impression using polyvinyl siloxane material and Type IV dental stone to fabricate the implant-supported framework for Group III.

Eligibility criteria

Inclusion Criteria: * Completely edentulous patients requiring full-arch implant-supported fixed prosthesis * Age 35-70 years * Adequate mandibular bone to place at least four implants without major grafting * Ability to undergo digital scanning and radiographic evaluation * Signed informed consent Exclusion Criteria: * Systemic conditions affecting healing (uncontrolled diabetes, immunosuppression) * History of head/neck radiotherapy or bisphosphonate therapy * Active oral infection or severe bruxism * Strong gag reflex preventing accurate scanning * Poor compliance or unwillingness to attend follow-up visits

Conditions

Dental Implants Edentulous Jaw Passive Fit

Locations

  • Faculty of Dentistry, Mansoura University — Al Mansurah, Dakahlia Governorate, Egypt
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Official Source

Data sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

View Official Record