An observational study in Dental Implants, sponsored by University of Bern. Enrolling by invitation at 1 site in Switzerland. Open to participants aged 18 Years to 100 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-08-03.
Sponsored by University of Bern · Observational
The population of interest will be recruited out of a cohort of patients who were initially treated at the Department of Oral Surgery and Stomatology between 1997 and 2001. The findings from a total of 56 patients that received tooth replacement treatment with dental implants during this period, were previously published in 2008. Now, 20 years later, the investigators will potentially recruit and re-examine as many patients as possible out of this original cohort. Exclusion criteria will be patients not able to come to the re-examination, concomitant diseases that compromise the health of this subject during the comprehensive examination (i.e., active severe infectious diseases, liver or kidney dysfunction/failure, currently under treatment), pregnant women, or unwilling to sign the consent form. Besides them, no further exclusion criteria are defined as patients receiving no intervention. The investigators assume that will be able to retrieve 40 patients having roughly 80 implants with sinus floor augmentation.
Recruitment, screening, and informed consent procedure
Patients treated at the Department of Oral Surgery between 1997 and 2001 and who were included in the previous case series study will be potentially recruited. Patients who are willing to participate will receive informed consent. The risks and benefits of being part of this study will be thoroughly explained to the patients without a limit of time. All the questions will be answered. After signing the informed consent patients will be examined. The participants will not be charged any costs for the recall examination.
Study procedures
After ethical approval, available patients will be screened and recruited for a re-examination visit. The anamnesis of the patients will be assessed using a questionnaire. In case of uncertainties regarding the medical history, a report from the patient's physician will be requested. During this re-examination, photographs, in combination with a comprehensive and standard clinical and digital examination will be taken. Further, patients will be given questionnaires to assess patient-reported outcomes. The evaluation visit will take place within a maximum of 1 hour, as the normal time required for a recall appointment on this type of patient with the presence of dental implants. Besides this one re-examination, no more visits will be necessary for the study outcomes. Data will be encrypted and collected in Redcap Software. The key for the encryption will be set up and stored by a person who is not involved in the study.
Patients included in the previous case series study who received tooth replacement therapy with dental implants and maxillary sinus augmentation procedures will be invited for a recall exam at the Department of Oral Surgery to be part of this prospective case series study. During this recall exam, photographs, a comprehensive anamnesis, followed by a standard clinical and digital examination, as well as patient-reported outcomes will be performed.
Primary and secondary outcomes will be measured and collected, and it will be tested whether long-term MBL is smaller than the clinically relevant 5mm limit. As there is no reference group available and previously published raw data was presumably deleted due to data protection reasons, measurements of secondary outcomes will be summarized by calculating means (continuous data) or percentages (categorical data) including 95% confidence intervals, and compared to reported data from standard implant placement in other publications.
The reason for selecting this criterion is due to the new criteria published in the new classification of periodontal and peri-implant diseases and conditions, where a diagnosis of peri-implantitis should have 3mm of marginal bone levels respecting the implant's platform (Schwarz 2018).
To the best of the investigators' knowledge, this observational single-center study will be the first study providing the effectiveness of implant therapy in addition to sinus floor elevation procedures with a follow-up longer than 20 years. The findings of this study could bring a valuable perspective on the replacement of missing teeth with dental implants and could provide clinicians and researchers all over the world with reasons that guide the clinical decision-making process.
University of Bern is the lead sponsor of 209 studies on the registry; 47 are open to participants now.
Counted across the registry records on this site, refreshed daily.
The population of interest will be recruited out of a cohort of patients who were initially treated at the Department of Oral Surgery and Stomatology between 1997 and 2001.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion criteria will be patients:
Patients from a previous cohort of patients that received dental implants with sinus augmentation procedures
The primary endpoint is to assess the marginal bone loss (MBL) on the radiographs of implant-supported fixed partial dentures in patients who received maxillary sinus floor augmentation procedures.
Utilizing periapical radiographs
Time frame: 25 years
Demographics
Age (years), sex, ethnicity, systemic factors, habits, oral hygiene techniques, frequency (times/day), and supportive periodontal/implant therapy (times/year).
Time frame: 25 years
Clinical parameters
Probing depth (mm), presence of bleeding on probing and suppuration on probing, gingival/mucosal recession (mm), keratinized tissue width (mm), mobility, mucosal thickness (mm), presence of local contributing factors (i.e., presence of aberrant frenum attachment).
Time frame: 25 years
Radiographic parameters
Marginal bone levels (mm), presence of periapical pathosis, distance from the adjacent teeth/implants (mm), presence of open contacts, efficacy of sinus augmentation procedure.
Time frame: 25 years
Implant-related
Length and dimension of the dental implant (mm), manufacturer, the timing of implant placement after extraction, needed for additional bone or soft tissue augmentation procedures.
Time frame: 25 years
Prosthetic-related
Analysis of occlusion (Dental-PreScale), integrity of prosthetic restoration (survival and success rates), technical complications, esthetic score (Pink and White Esthetic Scores), occlusal contacts.
Time frame: 25 years
Patient-reported Outcome Measures
Visual Analog Score for the use of Oral Health Impact Profile-14, Visual Analog Score for the satisfaction of the treatment, etc
Time frame: 25 years
Plan to share: No — Data will be provided in a further publication based on the cohort of patients and not by single individuals.
No publications or documents are linked to this record.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
No contact was published for this record. The registry link below has the sponsor’s details.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.