Implant-supported Single Crowns
Conditions
Brief summary
The aim of this study is to test whether or not the use of screw-retained implant crowns on customized zirconia abutments results in biological, technical and esthetic outcomes similar to those obtained with cemented all-ceramic crowns on customized zirconia abutments, both made with a computer-aided design and manufacturing procedure (CAD/CAM). The null-hypotheses is that marginal bone level change is equal at screw-retained and cemented crowns
Interventions
PROCEDURECemented 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.
PROCEDUREScrew-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).
Sponsors
University of Zurich
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
SUPPORTIVE_CARE
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 80 Years
Healthy volunteers
No
Inclusion criteria
* Single-tooth Straumann Bone Level in the anterior maxilla or mandible * At least one adjacent natural tooth present * Implant position enabling both screw-retained and cemented crown * Informed consent signed
Exclusion criteria
* Smoking more than 15 cigarettes a day * Poor oral hygiene (Plaque index over 30%) * Pregnancy at the date of inclusion
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Marginal bone level | 5 years | The bone level represents an indicator of the osseointegration and biological success of the implant. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Biological, technical and esthetic outcome | up to 5 years | Radiographic bone level after 1 and 3 years |
Countries
Switzerland
Outcome results
None listed