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首页> 外文期刊>The Journal of Prosthetic Dentistry >In vivo force measurements on maxillary implants supporting a fixed prosthesis or an overdenture: a pilot study.
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In vivo force measurements on maxillary implants supporting a fixed prosthesis or an overdenture: a pilot study.

机译：支持固定假体或覆盖义齿的上颌植入物的体内力测量：一项初步研究。

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STATEMENT OF PROBLEM: In this preliminary study, an attempt was made to measure in vivo forces simultaneously on 5 maxillary implants with different types of superstructure. MATERIAL AND METHODS: Force measurements were carried out on 1 test patient with 5 ITI implants in the edentulous maxilla. A screw-retained fixed complete denture and an overdenture were fabricated for comparative measurements of forces. The overdenture could be mounted to 2 different types of bars. The measuring method was used with piezo-electric force transducers that were directly mounted onto the implants. This allowed for simultaneous measurements of forces in 3 dimensions, ie, in axial and transverse directions. Static and functional forces such as maximum biting (clenching), biting on a bite plate, and chewing food were registered. All measurements were repeated in the same way 2 years later. RESULTS: The registered forces exhibited similar force patterns with both types of superstructure and both types of bars for overdenture connection. The force magnitudes were significantly different for the 3 dimensions (P<.05) with highest forces along the implant axis. On the posterior implants, force magnitudes were significantly higher (P<.05) than on the anterior implants in all 3 dimensions. On the anterior implants, under some test conditions, the transverse force components reached up to 100% of the axial force or even exceeded it during the chewing of food. During maximum biting, no upward force (tensile force) was found on any implant with the fixed complete denture, but upward force was found on one anterior implant with the overdenture. When chewing food, small force magnitudes in upward directions were regularly found with both superstructures. The force patterns between the first and second registrations showed similar trends, and no obvious differences were found. CONCLUSION: From these results it was concluded that similar patterns of force transmission onto the implants are observed with a fixed complete denture and an overdenture connected to maxillary implants. The bar design did not significantly influence the force pattern.
机译：问题陈述：在这项初步研究中，尝试同时测量5种具有不同上部结构类型的上颌植入物的体内力。材料与方法：对1名在无牙颌中植入5个ITI植入物的测试患者进行了力测量。制作了螺钉固定的固定全口义齿和全口义齿，用于比较力。覆盖义齿可以安装到2种不同类型的条上。测量方法与直接安装在植入物上的压电力传感器一起使用。这允许同时测量3个维度（即轴向和横向）上的力。记录了静态和功能力，例如最大的咬合（咬合），在咬合板上咬合和咀嚼食物。两年后，以相同的方式重复所有测量。结果：所记录的力在两种类型的上部结构和两种类型的覆盖义齿连接的钢筋上均表现出相似的作用力模式。沿植入物轴的最大力在3个维度上的力大小（P <.05）显着不同。在所有三个维度上，后种植体上的力大小均明显高于前种植体上的力大小（P <.05）。在某些测试条件下，在前植入物上，横向力分量在咀嚼食物时达到轴向力的100％，甚至超过轴向力。在最大咬合期间，在具有固定全口义齿的任何种植体上都没有发现向上的力（拉力），但是在有覆盖义齿的一个前种植体上却发现了向上的力。咀嚼食物时，经常会在两个上部结构中发现较小的向上作用力。第一次和第二次注册之间的力模式显示出相似的趋势，没有发现明显的差异。结论：从这些结果可以得出结论，在固定的全口义齿和与上颌植入物相连的覆盖义齿的情况下，观察到了类似的力传递至植入物的方式。杆的设计没有显着影响力的模式。

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