Magfit磁性附着体下颌全口覆盖义齿的固位力测定

目的　评价Magfit磁性附着体下颌全口覆盖义齿的口内固位力及附着体分布与义齿固位力间的关系。方法　以Magfit EX600、MD800磁性附着体作为固位装置,选择5名患者制作下颌全口覆盖义齿,采用电阻应变式修复体固位力测试仪测试粘固磁体前后义齿前、中、后3点垂直向及前斜上方60°的固位力。结果　粘固磁体后义齿固位力显著大于粘固磁体前(P<0·05),义齿不同部位固位力间无显著性差异(P>0·05),垂直向固位力大于前斜上方60°的固位力(P<0·025)。结论　磁性附着体可显著改善下颌全口覆盖义齿的固位,附着体位置分布影响义齿的固位力。

The Measurement of Retentive Forces in Mandibular Complete Overdenture with Magfit Magnetic Attachments

OBJECTIVE: To evaluate the in vivo retentive forces of mandibular complete overdenture with Magfit attachments, as well as the relation between the location of magnetic attachments and the retentive forces of the denture. METHODS: 5 patients were selected and treated with mandibular complete overdentures retained by Magfit EX600 and MD800 attachments. A strainometer was used to measure the retentive forces in anterior, central and posterior parts of the overdenture before and after magnets were set. The vertical and anterior-upper 60 degrees retentive forces of the overdenture were measured one month later. RESULTS: The retentive forces of the overdentures after setting magnets were significantly greater than that before magnets were set (P < 0.05). There was no significant difference in retentive forces between the different parts (P > 0.05). The retentive force in vertical direction was greater than that in anterior-upper 60 degrees direction (P < 0.025). CONCLUSION: Magnetic attachments can significantly improve the retention of mandibular complete overdenture. The location of magnetic attachments greatly influences the retentive force of the overdenture.