Statistical analysis of the chronological medial migration of the natural teeth

牙周病被认为是固定种植体与邻牙间近端接触丧失的危险因素之一，但尚未见报道。本研究对105例牙周病患者的牙周病状态与牙周素丧失的关系进行了调查。因此，牙周病的严重程度与IC的损失有显著的相关性（r=0.246， P=0.001），与食物嵌塞的损失有显著的相关性（r=0.344，P=0.01）。因此，在种植体维持时，有必要仔细观察IC和牙周组织的状态，如果观察到IC的丢失，建议有必要修复丢失的IC。

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.