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Few if any studies have compared marginal bone loss (MBL) around implant-retaining overdentures (2 implants with locators) versus implant supported fixed hybrid prosthesis (over 4 implants) in the mandible.
Material and Methods: Patients of the saint Joseph university dental clinics, who have already in their records peri-apical radiographs of the implants post loading, will be divided in 2 groups depending on the prosthetic treatment that they have had for 5 years in mouth, and will be recalled for a check-up session during which the investigators will take new peri-apical X-rays by means of the parallel long-cone technique for the implants that are supporting/retaining the prosthesis. A total of minimum 50 implants placed in a minimum of 19 patients will be examined. The mean mesial and distal radiographic MBL and bone to implant contact (BIC) will be recorded by comparing the two X-rays for each implant.
the investigators will also investigate the possibly related factors that may have contributed to this marginal bone loss such as the medical history, smoking habits, oral hygiene, compliance, presence of keratinized tissue and possibility of proper cleaning.
Results: the investigators aim to find a statistically significant difference in the Marginal bone loss around implants assisting these two types of prosthesis and a possible correlation with some risk and modifying factors.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| 1- hybrid prosthesis | Patients having fixed hybrid prosthesis over 4 implants in the mandible for 5 years |
| |
| 2- over denture | Patients having removable overdenture with locators over 2 implants in the mandible for 5 years |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Peri-apical radiographs on the implants | Radiation | Peri-apical radiographs on the implants supporting the prosthesis |
|
| Measure | Description | Time Frame |
|---|---|---|
| Marginal Bone Loss in mm (MBL) | MBL in mm around implants in patients having a removable prosthesis over locators and in patients having a screw retained hybrid prosthesis | 5 years |
| Measure | Description | Time Frame |
|---|---|---|
| smoking status | non smoker, smoker less than 10 cig/day, smoker more than 10 cig/day | 5 years |
| compliance and attendance to recall sessions | patient attending the recall sessions or no |
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Inclusion Criteria:
Exclusion Criteria:
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To determine the sample size, a power analysis was conducted for independent Student t test using G*Power and considering a power = 80%, alpha = 5%, and an effect size = 1.06. The minimum sample size required for this study is 50 implants in total: (25 per group)
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| Name | Affiliation | Role |
|---|---|---|
| Elies El Hachem, DDS | Saint Joseph University of Beirut, Faculty of dental Medicine, Periodontolgy department | Principal Investigator |
| Nadim Mokbel, PhD | Saint Joseph University of Beirut, Faculty of dental Medicine, Periodontolgy department | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Saint Joseph University of beirut | Beirut | 00000 | Lebanon |
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| 5 years |
| keratinized tissue hight | measured in mm with a periodontal probe | 5 years |
| framework design | prosthetic framework fit/misfit | 5 years |
| age | in years | 5 years |
| health status | diabetes yes/no ; cardiovascular disease yes/no | 5 years |
| sex | male female | 5 years |
| plaque score | using the modified plaque index (0 absence,1 detectable by a probe, 2 visible, 3 abundant) | 5 years |