To Compare Cemented Versus Screw-retained Implant-supported Single Crowns With Customized Zirconia Abutments

University of Zurich (UZH)

Status: Completed

Conditions: Implant-supported Single Crowns

Treatments: Procedure: Screw-retained crowns; Procedure: Cemented crowns

Study type: Interventional

Funder types: Other

Identifiers

NCT01644630

2012-0147

Details and patient eligibility

About

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

Enrollment: 34 patients

Sex: All

Ages: 18 to 80 years old

Volunteers: No Healthy Volunteers

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

Trial design

Primary purpose: Supportive Care

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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34 participants in 2 patient groups

Cemented single crowns

Active Comparator group

Description:

Cemented single crown: zirconia abutment (Straumann Cares abutment) with an all-ceramic lithium disilicate crown

Treatment:

Procedure: Cemented crowns

Screw-retained single crown

Active Comparator group

Description:

Screw-retained single crown: zirconia abutment (Straumann Cares abutment), directly veneered with veneering ceramic

Treatment:

Procedure: Screw-retained crowns