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Biomechanical effects of titanium implants with full arch bridge rehabilitation on a synthetic model of the human jaw.

机译:全弓桥修复钛植入物对人颌骨合成模型的生物力学影响。

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摘要

A composite model of the mandible, constituted by an inner polymeric core and a glass fibre reinforced outer shell, has been developed and equipped with six ITI titanium implants and a full gold alloy arch bridge prosthesis. The effects of this oral rehabilitation on the biomechanics of the mandible are investigated through a simulation of the lateral component of the pterygoid muscles. These muscles are involved as the mouth is opened and closed, hence their activity is very frequent. An increase of the mandible stiffness due to the prosthesis is observed; moreover, the coupling of the relatively stiff rehabilitation devices with the natural tissue analogue leads to stress-shielding and stress-concentration in the incisal and molar regions, respectively. Although the amplitude of the force generated by pterygoid muscles is quite small, high strains over the incisal region are measured. A stress-shielding effect, of about 20%, is observed at the symphysis as the full arch bridge prosthesis is fixed on the implants. Therefore, the presence of the prosthesis leads to significant modification of the stress field experienced by the mandible, and this may be relevant in relation to the biomechanics of mandibular bone remodelling.
机译:已开发了下颌骨的复合模型,该模型由内部聚合物核和玻璃纤维增​​强的外壳构成,并配备了六个ITI钛植入物和一个全金合金弓桥假体。通过模拟翼状muscle肌的侧向成分研究了这种口腔康复对下颌骨生物力学的影响。这些肌肉在张开和闭合时会参与其中,因此它们的活动非常频繁。观察到由于假体导致下颌骨硬度增加;此外,相对刚性的康复装置与天然组织类似物的结合分别导致在切牙和磨牙区域的应力屏蔽和应力集中。尽管翼状muscle肌产生的力幅值很小,但在切牙区域仍可测得较高的应变。当完整的弓桥假体固定在植入物上时,在共骨处观察到约20%的应力屏蔽效果。因此,假体的存在导致下颌骨经历的应力场发生显着改变,这可能与下颌骨重塑的生物力学有关。

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