Objective: Study the pullout strength of SpineGuard/Zavation Dynamic Surgical Guidance Z-Direct Screw (DSG Screw), a screw pedicle designed to be inserted using a direct insertion technique.
Methods: DSG Screws of 5.5 mm and 6.5 mm were introduced into polyurethane blocks with a density of 10 PCF (0,16 g/cm). According to the experimental group, screws were inserted without pilot hole, with pilot without tapping, undertapping and line-to-line tapping. Screw pullout tests were performed using a universal test machine after screw insertion into polyurethane blocks.
Results: Screws inserted directly into the polyurethane blocks without pilot hole and tapping showed a statistically higher pullout strength. Insertion of the screw without tapping or with undertapping increases the pullout screw strength compared to line-to-line tapping.
Conclusion: DSG Screw showed the highest pullout strength after its insertion without pilot hole and tapping.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8443012 | PMC |
| http://dx.doi.org/10.1590/1413-785220212904241648 | DOI Listing |
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