“…IL-4 [50, 51], IL-12 [55, 56], IL-18 [59, 60], and IFN- γ [61] inhibit TNF- α -induced osteoclast formation in vitro and in vivo . It has been reported that the cytokines IL-1 β [62], TNF- α [38, 43, 44], IL-6 [63–65], IL-8 [64, 65], RANKL [66], M-CSF [67], TGF- β [68], IL-2 [65], and IFN- γ [69] were locally increased during orthodontic tooth movement. These cytokines may affect osteoclast formation during orthodontic tooth movement.…”