ArticleBMC oral health2025
A comparative study of deformation in hexagonal and star-shaped implant screwdriver heads.
Article in BMC oral health, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
3 citing papers in PubMed.
- A Novel Abutment Screw Head Design with an Integrated Retrieval Feature: An In Vitro Study.Dentistry journal · 2026Article
- Comparative in vitro evaluation of the mechanical behavior of implant-abutment connections for zirconia and titanium implants.BMC oral health · 2026Article
- Article
Corrections and comments
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundDental implants are a popular and effective solution for replacing missing teeth. However, there are challenges such as screw loosening and component failure. This deformation can impact torque application and screw retention. While research has focused on implant system longevity, there is limited investigation into how different screwdriver head designs, particularly hexagonal and star-shaped, perform under repeated opening and closing cycles, which are crucial for long-term implant stability. The study compared the deformation characteristics of hexagonal and star-shaped implant screwdriver heads after multiple opening and closing cycles.
methodsIn this in vitro experimental study, abutments were placed on two implant systems mounted in die stone and torqued to 25 N/cm according to the manufacturer's recommendations, using 12 screwdrivers (n = six for each implant). The screwdriver heads underwent examination under a stereomicroscope at 50x magnification. Subsequently, the outline and deformation of the screwdriver head after 0, 50, 100, 200, and 300 opening and closing cycles were analyzed using AutoCAD software. The changes in the surface area of hexagonal and star-shaped driver heads after different cycles were statistically evaluated using SPSS 24 (α = 0.05).
resultsThe investigation revealed a reduction in the surface area of both hexagonal and star-shaped driver heads with an increase in the frequency of cycles. Notably, following all cycles, except 0-50 and 50-100, the alterations in the surface area of the star-shaped driver head were significantly greater than those observed in the hexagonal driver head (P < 0.001).
conclusionThe study shows that the star-shaped driver head deformed more than the hexagonal one, especially in cycles exceeding 100.
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