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Aim: The identification of specific alterations in the alveolar jawbone of patients treated with nitrogen-containing bisphosphonates (NBP) but without bisphosphonate-related osteonecrosis of the jaw (BRONJ) may help to identify the early steps of BRONJ and to select patients at risk for it.Materials and Methods: We performed a case-control study. Cases were 60 individuals treated with NBP without clinical and radiological signs of BRONJ and requiring surgical tooth extraction. Controls were 60 individuals never treated with NBP and requiring tooth extraction. Cases and controls were matched by sex (same) and age (within 5 years). 18 categorical (basophile reversal lines, osteoblasts, osteoblastic lines, osteocytes, empty osteocytic lacunae, osteoclasts, Howship’s lacunae, vessel dilatation, vascular congestion, arteriolar thickening, intravascular fat globules, calcific fat necrosis, fatty bone marrow, ruptured adipocytes, granular cytoplasm of adipocytes, oil cysts, perivascular fibrosis, diffuse fibrous metaplasia) and 2 ordinal histopathological variables (inflammation and bone maturation) were investigated. Exact univariable and multivariable (correction for gender and age) logistic regression was used to test the association between NBP use and the histopathological variables. Because of multiple comparisons, the critical p-value was set to 0.0025 (0.05/20).Results: Cases and controls did not differ for any study variable except for vascular congestion that was significantly associated with NBP use (multivariable OR = 0.24, exact 95% CI 0.10 to 0.57 for cases vs. controls, p = 0.0006).Conclusions: Use of NBP does not produce specific histological alveolar bone alterations in the absence of overt BRONJ disease.

Exposure to antiresorptive therapy with bisphosphonates does not induce histological changes in human alveolar jawbone