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曾有文献报道,通过义齿传导的连续和/或间断的机械压力是引起义齿下支持组织骨吸收的重要原因之一。然而,破骨性骨吸收的发生,到底是由压力—阈值调节,还是随压力值成正比例的增加而变化,上述两种假设,缺乏准确的依据。本实验将对此作出定性分析。 实验选用85只15周龄的雄性大鼠。分为二组,一组为连续压力组(n=45),另一组为间断压力组(n=40)。在大鼠磨牙间的硬腭区,分别戴入能施以连续或间断压力的两种类型的实验性义齿。每一义齿包含一个固定金属支架(Ag-Au-Pd合金)和一个活动义齿基托(热凝树脂)。固定金属支架通过牙科粘接材料粘附于磨牙上而得以固定于每一大鼠的上颌磨牙。连续和
It has been reported in the literature that continuous and / or intermittent mechanical stress conducted through the denture is one of the important reasons for supporting the bone resorption in the denture. However, the occurrence of osteoclastic bone resorption depends on whether the pressure-threshold value is adjusted or whether it is proportional to the pressure value. These two hypotheses are lack of accurate basis. This experiment will make a qualitative analysis of this. Eighty five 15-week-old male rats were selected for the experiment. Divided into two groups, one for the continuous pressure group (n = 45), and the other for the intermittent pressure group (n = 40). In the hard palatal area between rat molars, two types of experimental dentures capable of applying continuous or intermittent pressure were respectively worn. Each denture contains a fixed metal stent (Ag-Au-Pd alloy) and a removable denture base (thermosetting resin). Fixed metal scaffolds were attached to the molars by dental adhesive to fix the maxillary molars in each rat. Continuous and