. "Any process that activates or increases the rate or extent of osteoblast proliferation." . . . "positive regulation of osteoblast proliferation" . "activation of osteoblast proliferation" . "stimulation of osteoblast proliferation" . "up regulation of osteoblast proliferation" . "up-regulation of osteoblast proliferation" . "upregulation of osteoblast proliferation" . . .