Absence of Tumor Necrosis Factor Receptor 1 Inhibits Osteoclast Activity in Apical Dental Resorption Caused by Endodontic Infection in Mice

Published:August 11, 2022DOI:



      The aim of this study was to evaluate osteoclastogenesis and dental resorption resulting from endodontic infection in wild-type (WT) and tumor necrosis factor receptor 1 genetically deficient (TNFR1 KO) mice.


      After approval by the ethics committee on the use of animals, 40 mice were distributed into 2 experimental groups based on time periods: 14 days (n = 10 WT mice and n = 10 TNFR1 KO mice) and 42 days (n = 10 WT mice and n = 10 TNFR1 KO mice). After these periods, morphometric analysis was performed using bright field and fluorescence microscopy and tartrate-resistant acid phosphatase histoenzymology to identify osteoclasts. One-way analysis of variance followed by the Tukey post hoc test was used for the statistical analysis (α = 0.05).


      WT mice in the 42-day period had a greater apical dental resorption in the distal root of the first molar than TNFR1 KO mice (P < .05). On the other hand, TNFR1 KO mice showed a smaller number of osteoclasts on the dental surface than WT mice (P < .05).


      WT mice with apical periodontitis had more extensive apical dental resorptions and a larger number of osteoclasts on the tooth surface than TNFR1 KO mice.

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