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OpenTrials
Completed

NCT Number: NCT07489027

Comparison of Prosthetic Complications and Framework Misfit Among Different Cobalt-Chromium Framework Fabrication Techniques

This randomized clinical study aimed to compare prosthetic complications and framework misfit associated with three different fabrication techniques of cobalt-chromium frameworks-conventional casting, CAD/CAM milling, and selective laser melting (SLM)-used in maxillary and mandibular full-arch implant-supported acrylic screw-retained restorations.

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Key information

Conditions

Prosthesis (Internal) Complications

Age range

45 year–70 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Mansoura University , Faculty Of Dentistry

Al Mansurah, Dakahlia Governorate, P.O.Box:35516, Egypt

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • • Six osseointegrated maxillary and six mandibular implants
  • No clinical or radiographic signs of implant failure
  • Good systemic health
  • Normal maxillomandibular relationship and acceptable oral hygiene

Exclusion criteria

  • • Implant failure
  • Unfavorable occlusal relationships
  • Poor compliance or inability to attend follow-up

Treatment and study plan

Implant supported prosthesis

Device

All patients received maxillary and mandibular six implants to support a metal acrylic screw retained full-arch prosthesis

Primary outcomes

  1. the number of occurance of Prosthetic complications

    Time frame: after a year

    The prosthetic complications were evaluated for the three different types of Co-Cr frameworks

    The following prosthetic complications were evaluated:

    • abutment screw loosening
    • abutment screw fracture
    • prosthetic screw loosening
    • prosthetic screw fracture
    • acrylic teeth fracture (separation)
    • acrylic teeth wear (replacement)
    • co-cr framework fracture

Secondary outcomes

  1. the implant framework Passive fit

    Time frame: baseline

    the passivity of the framework was evaluated digitally using 3D scan protocol

Sponsors and collaborators

Lead sponsor

Mansoura University

Other

Registry information

Official study title

Comparison of Prosthetic Complications and Framework Misfit Among Different Cobalt-Chromium Framework Fabrication Techniques in Maxillary and Mandibular Full-Arch Implant-Supported Acrylic Screw-Retained Restorations: A Randomized Clinical Study

Important dates

Study start
2024
Primary completion
2024
Study completion
2026
First posted
Mar 23, 2026
Registry last updated
Mar 23, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.