- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04713800
Two-unit Cantilever Implant Prostheses Made of Monolithic Zirconia or PFM (Cantilever)
November 21, 2022 updated by: João Pitta, University of Geneva, Switzerland
Randomized Controlled Clinical Trial of Two-unit Cantilever Implant Prostheses Made of Monolithic Zirconia on Titanium Base Abutments or Porcelain-fused to Metal on Gold Abutments
The aim of is to compare the survival rate and technical outcomes of cantilever implant-supported fixed denture prosthetics (cFDPs) made either out of monolithic zirconia bonded to a titanium base in a digital workflow, or porcelain fused-to metal using a gold abutment in a conventional workflow.
In addition, biological outcomes, wear patterns, PROMs and time efficiency will be recorded.
The null hypothesis is: the reconstruction type does not influence the survival rate and technical outcomes of 2-unit implant-supported cFDP.
Study Overview
Status
Recruiting
Conditions
Intervention / Treatment
- Device: Monolithic zirconia screw retained implant-supported cantilever reconstruction supported by titanium base abutments, in a full digital workflow (ZR-TiB)
- Device: porcelain fused-to metal screw retained implant-supported cantilever reconstruction supported by a gold-abutment, in a conventional workflow (PFM-GA)
Study Type
Interventional
Enrollment (Anticipated)
38
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Contact
- Name: João Pitta, Dr
- Phone Number: +41223794088
- Email: joao.pitta@unige.ch
Study Locations
-
-
-
Geneva, Switzerland, 1211
- Recruiting
- University of Geneva
-
Contact:
- João Pitta, Dr
-
-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
22 years and older (ADULT, OLDER_ADULT)
Accepts Healthy Volunteers
Yes
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Minimal age of 22 years old.
- No general medical condition which represents a contraindication to implant treatment
- Good oral hygiene (PII ≤ 20%), and healthy periodontal tissues (BOP≤ 20%)
- Two adjacent-teeth gap in posterior maxilla or mandible arch (first premolar, second premolar, first molar, second molar) with an osseointegrated regular or wide-diameter bone-level implant in a prosthetically correct position to allow occlusal screw-retention. Free-end edentulous gaps can also be included
- Presence of antagonist occlusal units
Exclusion Criteria:
- Severe bruxism or clenching habits
- Patients with inadequate oral hygiene or persistent intraoral infection
- Women who are pregnant or breast feeding at the day of inclusion
- Smokers exceeding 15 cigarettes / day, or equivalent; patients chewing tobacco
- Unable or unwilling to cooperate for the trial period
- Estimated cantilever crown mesial-distal length > 10 mm
- Estimated implant crown height (from implant platform to occlusal contact points) > 15 mm
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: TREATMENT
- Allocation: RANDOMIZED
- Interventional Model: PARALLEL
- Masking: NONE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
EXPERIMENTAL: ZR-TiB
Monolithic zirconia screw retained implant-supported cantilever reconstruction supported by titanium base abutments, in a full digital workflow (ZR)
|
In group ZR-TiB the implant impressions will be taken using an intra-oral scanner and the respective scanbody.
The restorations will be manufactured by means of CAD/CAM procedures using monolithic zirconia.
For sufficient aesthetics, the zirconia restorations can be manually veneered with veneering ceramic only at the buccal surface, while the occlusal surface will remain monolithic and will be high-gloss polished.
The zirconia restorations will be extra-orally cemented onto titanium base abutments (Straumann® Variobase® for crown, Straumann AG), correctly polished and delivered to the patient, by screw-retention onto the implant.
Other Names:
|
ACTIVE_COMPARATOR: PFM-GA
Porcelain fused-to metal screw retained implant-supported cantilever reconstruction supported by a gold-abutment, in a conventional workflow (PFM)
|
In group PFM-GA implant impression will be taken using a polyvinyl siloxane or polyether impression material in a conventional manner with the use of stock trays and corresponding impression copings.
The framework will be manufactured by the lost wax-technique using a gold-abutment (Straumann® Gold abutment for crown, Straumann AG) and a gold-alloy.
All metal frameworks will be manually veneered with veneering ceramic, polished and glazed, and delivered to the patient, by screw-retention onto the implant.
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Technical complication rate
Time Frame: 5 years
|
assessed by USPHS-criteria
|
5 years
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Survival rate
Time Frame: 1, 3, 5 years
|
1, 3, 5 years
|
|
Biological parameters
Time Frame: 1, 3, 5 years
|
assessed by clinical examination by measuring with a periodontal probe: bleeding on probing (yes/no per site), pocket probing depth (mm), width of keratinized mucosa (mm), assessed by evaluation of standardized x-rays: marginal bone level changes (mm)
|
1, 3, 5 years
|
Wear rate of restoration and antagonist
Time Frame: 1, 3, 5 years
|
assessed by a volumetric analysis software
|
1, 3, 5 years
|
Patient Reported Outcomes Measures (PROMs)
Time Frame: 1, 3, 5 years
|
assessed through questionnaires: Oral Health Impact Profile (OHIP-14) to evaluate oral health-related quality of life [0-4 for each of the 14 questions, where 4 represents the worst outcome]; Visual Analogue Scales (VAS) to evaluate patient experience with the impression procedure [0-10, where 10 represents the best outcome]
|
1, 3, 5 years
|
Cost-efficiency
Time Frame: single-point measure at baseline
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assessed by measuring time and counting costs of materials between the two workflows procedures (digital vs. analogue)
|
single-point measure at baseline
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Accuracy of fabrication
Time Frame: single-point measure at baseline
|
measured in terms of occlusal adjustment needed between the two fabrication procedures (digital vs. analogue workflow)
|
single-point measure at baseline
|
Operator Reported Outcomes Measures
Time Frame: single-point measure at baseline
|
assessed through Visual Analogue Scales (VAS) to evaluate operator experience with the impression procedure and with the adjustment of the restoration [0-10, where 10 represents the best outcome]
|
single-point measure at baseline
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Collaborators
Investigators
- Principal Investigator: João Pitta, Dr, University of Genova
- Study Chair: Irena Sailer, Prof, University of Genova
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (ACTUAL)
July 28, 2021
Primary Completion (ANTICIPATED)
July 1, 2027
Study Completion (ANTICIPATED)
July 1, 2027
Study Registration Dates
First Submitted
January 12, 2021
First Submitted That Met QC Criteria
January 13, 2021
First Posted (ACTUAL)
January 19, 2021
Study Record Updates
Last Update Posted (ACTUAL)
November 23, 2022
Last Update Submitted That Met QC Criteria
November 21, 2022
Last Verified
November 1, 2022
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- Cantilver study
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
product manufactured in and exported from the U.S.
No
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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