Inoculation with Actinomyces viscosus increased the alveolar bone resorption scores in one commercially available rat strain, but not in another. Bone resorption scores in inoculated rats differed with the strains tested. Advanced bone resorption occurred in 4 of the 24 sites measured, and 4 sites were resistant to bone resorption. The other 16 sites provided no additional information. The two mandibular mesial sites provided the most sensitive measure of bone resorption.
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