Objective To study the expression of osteoprotegerin(OPG)at messenger RNA(mRNA)level in human periodontal ligament cells(hPDLCs)under mechanical force loading in vitro.

• 目的研究机械力对体外培养的人牙周膜细胞骨保护因子(osteoprotegerin,OPG)信使RNA(messengerRNA,mRNA)表达的影响。