Friction alone: can a dental crown stay put without cement or screws?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Subject aged between 18-75 years 2. Subject signed and dated the informed consent form 3. In need of an implant replacing a missing tooth in position 17 to 27 or 37 to 47, and each subject can only receive one study implant. 4. Neighbouring tooth to the planned implant must have * a natural root or an implant supported restoration mesially * a natural root or an implant supported restoration distally Exemption: If the planned implant is in the second molar position, an edentulous space is accepted distally. 5. Presence of natural tooth, partial prosthesis and/or implant supported restoration in the opposite jaw in contact with the planned crown 6. Deemed by the investigator as likely to present an initially stable implant situation Exclusion Criteria: 1. Unlikely to be able to comply with study procedures, according to Investigators judgement 2. Subject is not willing to participate in the study or not able to understand the content of the study 3. Involvement in the planning and conduct of the study 4. Severe non-compliance to CIP as judged by the Investigator and/or Dentsply Sirona Implants. 5. Unable or unwilling to return for follow-up visits for a period of five years 6. Simultaneous participation in another clinical study, or former participation in a clinical study during the last 6 months that may interfere with the present study 7. Previous enrolment in the present study 8. Uncontrolled pathological process in the oral cavity 9. Known or suspected current malignancy 10. History of radiation therapy in the head and neck region within 12 months prior to surgery 11. Systemic or local disease or condition that could compromise post-operative healing and/or osseointegration 12. Uncontrolled diabetes mellitus 13. Corticosteroids, iv bisphosphonates or any other medication that could influence post-operative healing and/or osseointegration 14. Current need for major bone grafting and/or augmentation in the planned implant area (minor grafting and soft tissue grafting are allowed) 15. Smoking more than 10 cigarettes per day, present alcohol or drug abuse 16. Known pregnancy at implant installation (Only applicable for sites in United States and Canada)