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• W2078445417 abstract "Purpose Bacterial colonization of the denuded bone in bisphosphonate-related osteonecrosis of the jaw suggests that bisphosphonates increase bacterial adhesion and biofilm formation. This study evaluated the adhesion of gram-positive and gram-negative bacteria on hydroxyapatite coated with pamidronate, one of the most potent bisphosphonates. Materials and Methods Twenty-five Staphylococcus aureus and 25 Pseudomonas aeruginosa strains were cultured on pamidronate-coated and uncoated hydroxyapatite discs. After incubation, nonadherent bacteria were removed by rinsing and centrifugation. Formation of a biofilm was confirmed by confocal laser 3-dimensional and scanning electron microscopy. The number of bacterial colonies was counted using quantitative cultures and mean numbers were compared using the Mann-Whitney rank sum test (statistical significance defined as P ≤ .05). The Hartree-Fock method was used for the calculation of electron interactions between hydroxyapatite ions and pamidronate. Results Fold increases in the number of colonies formed by S aureus and P aeruginosa in the presence of pamidronate compared with controls were 7.19 ± 4.127 and 2.87 ± 0.622, respectively. Hartree-Fock analysis showed that the reactive NH3+ group of pamidronate may act as a steric factor, facilitating anchoring of bacteria to the hydroxyapatite surface. Alternatively, the NH3+ group may attract bacteria by direct electrostatic interaction. Conclusions Increased bacterial adhesion in the presence of bisphosphonates can promote osteomyelitis in patients with bisphosphonate-related osteonecrosis of the jaw. There may be increased infection rates when bisphosphonates are used for stabilization of prostheses in joint arthroplasty and in osteotomies and open fractures in patients treated with bisphosphonates. Bacterial colonization of the denuded bone in bisphosphonate-related osteonecrosis of the jaw suggests that bisphosphonates increase bacterial adhesion and biofilm formation. This study evaluated the adhesion of gram-positive and gram-negative bacteria on hydroxyapatite coated with pamidronate, one of the most potent bisphosphonates. Twenty-five Staphylococcus aureus and 25 Pseudomonas aeruginosa strains were cultured on pamidronate-coated and uncoated hydroxyapatite discs. After incubation, nonadherent bacteria were removed by rinsing and centrifugation. Formation of a biofilm was confirmed by confocal laser 3-dimensional and scanning electron microscopy. The number of bacterial colonies was counted using quantitative cultures and mean numbers were compared using the Mann-Whitney rank sum test (statistical significance defined as P ≤ .05). The Hartree-Fock method was used for the calculation of electron interactions between hydroxyapatite ions and pamidronate. Fold increases in the number of colonies formed by S aureus and P aeruginosa in the presence of pamidronate compared with controls were 7.19 ± 4.127 and 2.87 ± 0.622, respectively. Hartree-Fock analysis showed that the reactive NH3+ group of pamidronate may act as a steric factor, facilitating anchoring of bacteria to the hydroxyapatite surface. Alternatively, the NH3+ group may attract bacteria by direct electrostatic interaction. Increased bacterial adhesion in the presence of bisphosphonates can promote osteomyelitis in patients with bisphosphonate-related osteonecrosis of the jaw. There may be increased infection rates when bisphosphonates are used for stabilization of prostheses in joint arthroplasty and in osteotomies and open fractures in patients treated with bisphosphonates." @default.
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• W2078445417 date "2013-06-01" @default.
• W2078445417 modified "2023-10-14" @default.
• W2078445417 title "Pamidronate Enhances Bacterial Adhesion to Bone Hydroxyapatite. Another Puzzle in the Pathology of Bisphosphonate-Related Osteonecrosis of the Jaw?" @default.
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• W2078445417 doi "https://doi.org/10.1016/j.joms.2012.12.005" @default.
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