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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
A comparative study on the initial stability of different implants placed above the bone level using resonance
In-Ho Kang1, Chang-Whe Kim, Young-Jun Lim
1Department of Prosthodontics, Graduate School, School of Dentistry, Seoul National University, Seoul, Korea.
The Journal of Advanced Prosthodontics
|January 20, 2012
Summary
Implant design significantly impacts initial stability when placed above bone level, especially in denser bone types. Shorter pitch intervals enhance stability for implants positioned supragingivally.
Area of Science:
- Dental Implantology
- Biomaterials Science
- Oral Surgery
Background:
- Assessing dental implant stability is crucial for successful osseointegration.
- Bone quality significantly influences implant primary stability.
- Implant placement relative to the bone crest affects biomechanical load distribution.
Purpose of the Study:
- To evaluate the initial stability of different dental implant systems placed above the bone level.
- To compare implant stability across various bone types (II, III, and IV) when positioned supragingivally.
- To determine the influence of implant design on initial stability in compromised bone conditions.
Main Methods:
- Bovine bone specimens were prepared to simulate Lekholm and Zarb bone types II, III, and IV.
- Three implant systems (Brånemark, Straumann, Astra Tech) were tested.
- Implants were placed level with bone (control) or 1-4 mm above bone level, with stability measured by resonance frequency analysis (Implant Stability Quotient - ISQ).
Main Results:
- ISQ values decreased with increased effective implant length across all bone types.
- Significant differences in ISQ were observed among implants in bone types III and IV.
- The Astra Tech implant showed less ISQ decrease per mm increase in effective length in bone types II, III, and IV compared to others.
Conclusions:
- Implant design, particularly features like short pitch intervals, is beneficial for initial stability when implants are placed above the bone level.
- Bone type and implant design are critical factors influencing the initial stability of supragingivally placed implants.
- Specific implant designs may offer superior stability in lower bone quality scenarios.
