Periimplant Crestal Bone Level Changes
Conditions
Keywords
Bacteria, bone level, bone loss, dental implants, implant design, platform-shifting, platform-matching
Brief summary
The concept of platform-switching has been introduced to implant dentistry based on clinical observations of reduced periimplant crestal bone loss. However, published available data are controversial and most studies are limited to 12 months. The aim of the present RCT was to test the hypothesis that platform-switching has a positive impact on crestal bone level changes after 3 years.
Detailed description
Two implants with a diameter of 4 mm were inserted crestally in the posterior mandible of 25 subjects. After three months of submerged healing, single-tooth crowns were randomly placed, either with (3.3mm platform, test) or without platform-switching (4mm platform, control). Patients were followed up at short intervals for monitoring of healing an oral hygiene. Statistical analysis for the influence of time and platform-type on bone levels employed the Brunner-Langer Model.
Interventions
DEVICEplatform-shifted implant
Sponsors
Søren Jepsen
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
ALL
Age
30 Years to 75 Years
Healthy volunteers
No
Inclusion criteria
* good general health * edentulous gap in the posterior mandible for placement of 2 implants * sufficient bone height above the alveolar nerve for placement of implants with a height of 9.5mm * bone width for placement of implants with diameter of 4mm * at least 4mm keratinized mucosa * medium or a thick soft tissue biotype
Exclusion criteria
* infectious disease * diabetes or osteopathy * active periodontitis * medication influencing bone metabolism * lactating or pregnant women
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Change of vertical implant bone level | Implant insertion (baseline), 3 months (reopening), 4 months (crown mounting), 12, 25 and 38 months |
Secondary
| Measure | Time frame |
|---|---|
| probing depths | 4, 8, 12, 25, 38 months |
| Bleeding | baseline, 4, 8, 12, 25, 38 months |
| Plaque | baseline, 4, 8, 12, 25, 38 months |
Outcome results
None listed