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Prosthetic success depends on mechanical stability. Consequently, maintaining abutment screw preload efficiency is a top priority for clinicians. Because of this, practitioners must understand how repeated tightening cycles impact the implant joint. Recently, researchers conducted a study on Variobase assemblies to provide these insights. Therefore, they analyzed four different interface configurations over ten cycles.
Specifically, the study evaluated tissue-level and bone-level platforms. Furthermore, the researchers applied a constant torque of 35 Ncm. Notably, the data revealed a progressive decrease in abutment screw preload efficiency across most groups. However, the tissue-level (RN) interfaces demonstrated much higher stability. In contrast, bone-level (RC) configurations showed significant variability. Moreover, friction fit occurred only in the bone-level groups. Consequently, this phenomenon altered the mechanical performance of the assembly.
Therefore, selecting the right platform is essential for long-term durability. Additionally, new components generally perform better than those tightened multiple times. Thus, clinicians should minimize repeated cycles to ensure optimal clamping force. Ultimately, recognizing these platform-specific variations helps prevent common complications like screw loosening. Consequently, this leads to better patient outcomes and enhanced prosthetic stability.
Preload efficiency is the percentage of applied torque that converts into clamping force. This force secures the abutment to the implant. High efficiency is vital to prevent screw loosening during functional use.
Tissue-level implants, such as RN configurations, often feature geometries that reduce mechanical variability. The study found these connections maintain predictable preload levels across multiple tightening cycles compared to bone-level CrossFit interfaces.
Friction fit occurs when components wedge together during tightening. While this feels stable, it can mask the true clamping force. Therefore, the measured torque may not reflect the actual preload, potentially leading to joint instability.
Disclaimer: This content is for informational and educational purposes only. It does not constitute professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.
References
Guobis Ž et al. Screw Preload Analysis in a Repeated Torque of Variobase Type Abutments. Int J Prosthodont. 2026 Jun 03. doi: 10.11607/ijp.9746. PMID: 42234483.
Byrne D et al. Preloads generated with repeated tightening in three types of screws used in dental implant assemblies. J Prosthodont. 2006;15(3):164–171. doi: 10.1111/j.1532-849X.2006.00096.x.
Bacchi A et al. Loosening torque of prosthetic screws in metal-ceramic or metal-acrylic resin implant–supported dentures with different misfit levels. J Biomech. 2013;46(7):1358-62. doi: 10.1016/j.jbiomech.2013.01.023.
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A study evaluating how repeated tightening cycles affect preload efficiency and mechanical stability in tissue-level and bone-level Variobase implant assemb...
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