Results: The zoledronic acid group showed higher incidence of non-vital bone than did the clodronate group at the tooth extraction site. At the soft tissue wound site, there were no significant differences in non-vital bone between the test groups. RANKL, OPG, von Willebrand factor, and caspase-3 did not show significant differences between the groups for both sites of surgical procedures. Conclusion: Both of the bisphosphonates zoledronic acid and clodronate are capable of inducing maxillary osteonecrosis. Immunohistochemical analysis suggests that the involvement of soft tissues as the initiator of osteonecrosis development is less probable than has been pointed out. Objective: The aim of this study was to evaluate the expression of CD1a, CD4, CD8, CD20, caspase-3, tryptase and basement membrane thickness in oral lesions of lichen planus (LP) and lupus erythematosus (LE). Method: Oral lesions of LP (n=21) and LE (n=23) were biopsied. After confirmation of diagnosis, the specimens were submitted to PAS and immunohistochemistry. Results: CD1a expression was significantly greater in epithelium and connective tissue in LP. Epithelial CD4 and CD20 did not differ between the diseases, but were greater in connective tissue in LP. CD8 expression was greater in both epithelium and connective tissue in LP. Caspase-3 did not differ between the groups, whereas tryptase was greater in LE epithelium. Basement membrane thickness did not differ between LP and LE. Conclusion: CD1a, CD4, CD8, CD20, caspase-3 and tryptase expression and the basement membrane thickness are not definitive criteria for differential diagnosis of oral lichen planus and lupus erythematosus. Objective: Odynophagia may be caused by inflammatory/ infectious conditions and tumors arising within the oropharynx. We present an unusual case of a follicular dendritic cell sarcoma (FDCS) of the tonsil manifesting with odynophagia.