Evaluation of implant abutment screw head deformation in hexagonal and star designs after successive tightening and loosening.
Tahereh GhaffariAmin NourizadehElnaz ShafieiShima GhasemiMohammadhasan MahmoudzadehKosar AtaeiPublished in: Journal of advanced periodontology & implant dentistry (2022)
Increasing the number of tightening and loosening rounds increased the screw head surface area in both hexagonal and star-shaped geometrical forms. Also, the extent of area changes at all stages in star-shaped screw heads was greater than in hexagonal screws.