To Compare Cemented Versus Screw-retained Implant-supported Single Crowns With Customized Zirconia Abutments
NCT ID: NCT01644630
Last Updated: 2020-11-06
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
NA
34 participants
INTERVENTIONAL
2012-07-27
2019-11-11
Brief Summary
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The null-hypotheses is that marginal bone level change is equal at screw-retained and cemented crowns
Detailed Description
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Conditions
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Study Design
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RANDOMIZED
PARALLEL
SUPPORTIVE_CARE
NONE
Study Groups
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Cemented single crowns
Cemented single crown: zirconia abutment (Straumann Cares abutment) with an all-ceramic lithium disilicate crown
Cemented crowns
The final lithium disilicate crowns will be cemented with an adhesive cement after tightening the abutments with the torque indicated by the manufacturer and closing the screw access hole with white guttapercha. The abutment will be cleaned with ethanol. A retraction cord will be placed for cementation if indicated. The crown will be etched with hydrofluoric acid and subsequently silanized. A sufficient amount of cement will be filled in the crown without creating major excesses. When the crown is seated correctly, the cement will be light-cured for a few seconds to facilitate the removal of the now hard excess cement.
\- Excess cement will be meticulously removed with a carbon scaler. The removal of all excess cement will be checked with an X-ray and by visual and tactile inspection.
Screw-retained single crown
Screw-retained single crown: zirconia abutment (Straumann Cares abutment), directly veneered with veneering ceramic
Screw-retained crowns
The screw-retained crowns will be inserted and tightened with the torque indicated by the manufacturer. The screw access hole will to be closed with white guttapercha and a composite filling (Filtek, 3M ESPE).
Interventions
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Cemented crowns
The final lithium disilicate crowns will be cemented with an adhesive cement after tightening the abutments with the torque indicated by the manufacturer and closing the screw access hole with white guttapercha. The abutment will be cleaned with ethanol. A retraction cord will be placed for cementation if indicated. The crown will be etched with hydrofluoric acid and subsequently silanized. A sufficient amount of cement will be filled in the crown without creating major excesses. When the crown is seated correctly, the cement will be light-cured for a few seconds to facilitate the removal of the now hard excess cement.
\- Excess cement will be meticulously removed with a carbon scaler. The removal of all excess cement will be checked with an X-ray and by visual and tactile inspection.
Screw-retained crowns
The screw-retained crowns will be inserted and tightened with the torque indicated by the manufacturer. The screw access hole will to be closed with white guttapercha and a composite filling (Filtek, 3M ESPE).
Eligibility Criteria
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Inclusion Criteria
* At least one adjacent natural tooth present
* Implant position enabling both screw-retained and cemented crown
* Informed consent signed
Exclusion Criteria
* Poor oral hygiene (Plaque index over 30%)
* Pregnancy at the date of inclusion
18 Years
80 Years
ALL
No
Sponsors
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University of Zurich
OTHER
Responsible Party
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Principal Investigators
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Daniel Thoma, Prof. Dr.
Role: PRINCIPAL_INVESTIGATOR
Clinic of Reconstructive Dentistry
Locations
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Clinic of Reconstructive Dentistry
Zurich, , Switzerland
Countries
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Other Identifiers
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2012-0147
Identifier Type: -
Identifier Source: org_study_id