Statistical analysis of the chronological medial migration of the natural teeth

牙周病被认为是固定种植修复体与邻牙邻面接触丧失的危险因素之一，但目前尚未见报道。在这项研究中，牙周病的状态和IC的损失之间的关系进行了调查，为105名患者。结果显示，IC的丢失与牙周病的严重程度有显著相关性（r= 0.246，P =0.001），与食物嵌塞有显著相关性（r= 0.344，P =0.01）。因此，有必要在种植体维护时仔细观察IC和牙周组织的状态，并且，如果观察到IC的损失，则建议有必要恢复IC的损失。

It is considered that periodontal disease is one of risk factors of the loss of interproximal contact (IC) between fixed implant prostheses and adjacent teeth, but it is not reported yet. In this study, the relation between the state of periodontal disease and the loss of IC was investigated for 105 patients. As a result, there is a significant correlation between the loss of IC and the degree of the periodontal disease(r=0.246, P=0.001), and there is a significant correlation between the loss of IC and food impaction(r=0.344,P=0.01). Therefore, it is necessary to observe the state of IC and the periodontal tissue carefully at the time of implant maintenance, and, if the loss of IC was observed, it was suggested that it was necessary to restore the loss of IC.