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This in vitro study evaluated the protective effect of titanium tetrafluoride (TiF 4 ) varnish and silver diamine fluoride (SDF) solution on the radiation-induced dentin caries. Bovine root dentin samples were irradiated (70 Gy) and treated as follows: (6 h): 4% TiF 4  varnish; 5.42% NaF varnish; 30% SDF solution; placebo varnish; or untreated (negative control). Microcosm biofilm was produced from human dental biofilm (from patients with head-neck cancer) mixed with McBain saliva for the first 8 h. After 16 h and from day 2 to day 5, McBain saliva (0.2% sucrose) was replaced daily (37 °C, 5% CO 2 ) (biological triplicate). Demineralization was quantified by transverse microradiography (TMR), while biofilm was analyzed by using viability, colony-forming units (CFU) counting and lactic acid production assays. The data were statistically analyzed by ANOVA ( p  < 0.05). TiF 4  and SDF were able to reduce mineral loss compared to placebo and the negative control. TiF 4  and SDF significantly reduced the biofilm viability compared to negative control. TiF 4  significantly reduced the CFU count of total microorganism, while only SDF affected total streptococci and mutans streptococci counts. The varnishes induced a reduction in lactic acid production compared to the negative control. TiF 4  and SDF may be good alternatives to control the development of radiation-induced dentin caries.

Protective effect of titanium tetrafluoride and silver diamine fluoride on radiation-induced dentin caries in vitro