Implant-supported Fixed Dental Prostheses (FDPs) With Cantilever Extension

Clinical and Radiographic Outcomes of Implant-supported Full-ceramic Partial Fixed Dental Prostheses With Cantilever Extension: A Proof of Principle Study With a Follow-up of at Least 1 Year

To report the clinical and radiographic outcomes of implant-supported fixed dental prostheses with full-ceramic cantilever extensions (FDPCs) after a function time ≥ 12 months.

Study Overview

• Status: Completed
• Conditions: Peri-Implantitis; Dental Implant Failed; Prosthesis Failure
• Intervention / Treatment: Procedure: Implant-supported fixed dental prostheses with cantilever extension

Detailed Description

Patients with full ceramic FDPCs in anterior and posterior areas will be clinically and radiographically re-evaluated. Mesial and distal radiographic marginal bone levels (mBLs) from baseline (i.e. delivery of FDPC) to the follow-up examination were calculated and compared between implant surfaces adjacent to and distant from the cantilever extension. Implant survival rate (%), pocket probing depth (PPD), presence/ absence of bleeding on probing (BoP) and presence/absence of mechanical/technical and biological complications were recorded.

• Study Type: Observational
• Enrollment (Actual): 35

Contacts and Locations

Study Locations

• Switzerland
  • Bern, Switzerland, 3010
    • Department of Periodontology, University of Bern

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 99 years (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes

• Sampling Method: Non-Probability Sample

Study Population

Patients with missing teeth rehabilitated with dental implants supporting partial fixed dental prostheses with cantilever extensions

Description

Inclusion Criteria:

• Patients aged ≥18 years
• Written informed consent
• Patients with systemic health or controlled medical conditions
• Patients with healthy or treated periodontal conditions
• Patients enrolled in regular supportive periodontal therapy (SPT)
• Patients without clinical signs of bruxism and/or oral parafunctions
• 2 osseointegrated dental implants in the canine or posterior areas of maxilla and mandible following transmucosal placement and healing of 3-6 months
• Tissue level solid-screw implants with a sand-blasted and acid- etched (SLA) surface with an endosseous diameter of 3.3, 4.1 or 4.8 mm, a length of 8, 10 or 12 mm, a shoulder diameter of 4.8 mm and a supracrestal machined neck with a height of 1.8 or 2.8 mm (Straumann® Dental Implant System, Institut Straumann AG, Basel, Switzerland)
• Full-ceramic
• Utilization of prefabricated titanium abutments
• Cemented (3M™ ESPE Ketac™ Cem, Seefeld, Germany) or screw-retained fixed dental prostheses with a mesial or distal cantilever extension (FDPCs)
• Cantilever extension corresponding to 1 premolar unit (i.e., 6-7 mm)
• Absence of occlusal contacts or guidance on the cantilever extension at baseline
• Opposing dentition consisting of natural teeth or fixed or removable prosthetic restorations
• Availability of a periapical radiograph at baseline (i.e. FDPC delivery)
• Availability of PPD measurements (mm) taken at baseline at 4 sites/implant with a graduated Michigan periodontal probe (Deppeler SA, Rolle, Switzerland)
• Availability of BoP measurements (%) (Lang et al., 1986) taken at baseline at 4 sites/implant with a graduated Michigan periodontal probe (Deppeler SA, Rolle, Switzerland).

Exclusion Criteria:

• Untreated or active periodontal diseases
• Immediate implant placement (i.e., Type I implant placement according to Hämmerle et al., 2004)
• FDPCs in the aesthetic zone (i.e., replacement of maxillary or mandibular incisors)
• FDPCs supported by hollow-screw and hollow-cylinder implants

Study Plan

How is the study designed?

Design Details

• Observational Models: Cohort
• Time Perspectives: Prospective

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
Patients with oral implants supporting full ceramic fixed dental prostheses	Procedure: Implant-supported fixed dental prostheses with cantilever extension; Healthy patients in need of replacement of missing teeth with dental implants supporting partial fixed dental prostheses with cantilever extensions

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Implant survival rate	Percentage of dental implants present at follow-up visit	12 months

Secondary Outcome Measures

Outcome Measure	Time Frame
Peri-implant marginal bone level changes	12 months
Number of technical complications	12 months
Number of mechanical complications	12 months
Number of Biological complications	12 months

Collaborators and Investigators

• Sponsor: University of Bern
• Investigators: Principal Investigator: Andrea Roccuzzo, University of Bern

Study record dates

Study Major Dates

• Study Start (Actual): January 2, 2023
• Primary Completion (Actual): September 30, 2023
• Study Completion (Actual): December 31, 2023

Study Registration Dates

• First Submitted: December 22, 2022
• First Submitted That Met QC Criteria: December 22, 2022
• First Posted (Actual): January 9, 2023

Study Record Updates

• Last Update Posted (Actual): January 22, 2026
• Last Update Submitted That Met QC Criteria: January 19, 2026
• Last Verified: January 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Periodontal Diseases; Mouth Diseases; Stomatognathic Diseases; Postoperative Complications; Pathologic Processes; Pathological Conditions, Signs and Symptoms; Peri-Implantitis; Prosthesis Failure
• Other Study ID Numbers: FDPs with cantilever

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No