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Published on: March 7, 2014
Bone strains around immediately loaded implants supporting mandibular overdentures in human cadavers
Kivanç Akça1, Murat Akkocaoglu, Ayhan Cömert
1Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Sihhiye, Ankara, Turkey. akcak@hacettepe.edu.tr
Summary
Splinting two mandibular implants for overdentures significantly reduces bone strain under immediate load. This biomechanical effect enhances implant stability compared to unsplinted designs, crucial for long-term dental restoration success.
Area of Science:
- Biomaterials and Biomechanics
- Dental Implantology
- Prosthodontics
Background:
- Mandibular overdentures (ODs) are commonly supported by dental implants.
- Immediate loading of implants can induce significant biomechanical stress on surrounding bone tissue.
- Understanding bone strain is critical for optimizing implant-supported prostheses and ensuring long-term success.
Purpose of the Study:
- To compare the biomechanical effects of splinted versus unsplinted mandibular implants supporting ODs.
- To evaluate bone tissue deformation under experimental static immediate load using strain gauge analysis.
- To investigate the influence of different attachment types (bar-retained, cantilevered bar-retained, ball-retained) on strain distribution.
Main Methods:
- Strain gauges were applied to the labial cortical bone adjacent to two interforaminal implants in four edentulous human cadaver mandibles.
- Implant stability was assessed using installation torque value (ITV) and resonance frequency analysis (ISQ).
- Three types of ODs (splinted bar, splinted cantilevered bar, unsplinted ball) were tested under anterior and posterior static loads up to 100 N.
Main Results:
- Anterior loading resulted in significantly higher bone strains than posterior loading across all attachment types.
- Compressive strains were observed, with the maximum strain (-797 microepsilon) recorded for unsplinted ball-retained ODs under anterior loading.
- Significant correlations were found between implant torque values (ITV) and removal torque values (RTV), but not with ISQs.
Conclusions:
- Splinting two interforaminal implants for mandibular ODs significantly reduces initial bone tissue strains under immediate load.
- The biomechanical advantage of splinting was evident regardless of the specific attachment system used.
- These findings suggest that splinting enhances initial implant stability and may mitigate risks associated with immediate loading.
