种植体与天然牙联合支持固定桥的生物力学分析

发布时间：2018-05-22 07:16

  本文选题：生物力学 + 电阻抗　； 参考：《中国组织工程研究》2017年32期

【摘要】：背景:天然牙和种植体应力分布模式不尽相同,种植体-天然牙联合支持式固定桥的应力分布模式有待探讨。目的:对种植体、天然牙单冠以及种植体-天然牙联合支持固定桥进行垂直载荷,分析种植体骨界面与天然牙牙周的应力、应变分布情况。方法:选用2只成年雄性Beagle犬,全麻下拔除2只犬右侧下颌第一磨牙,3个月后拔牙区植入1颗Straumann 3.3 mm×10 mm常规颈种植体。3个月后麻醉处死,去处软组织后取完整下颌骨,一只犬行右侧下颌第四双根牙单冠和种植体单冠修复,另一只犬行联冠修复。下颌骨采用自凝塑料包埋后固定在加载装置上,在种植体和天然牙颈部相对应的颊舌侧皮质骨上贴应变片,并贴相应的电阻补偿片。在种植体、天然牙单冠以及种植体-天然牙固定桥基牙咬合面上分别采用40,60,80,120及160 N的力进行垂直加载。结果与结论:(1)种植体天-然牙联合修复后,当加载在种植体上时,其应变值要小于加载在种植体单冠上的应变值,部分负荷为天然牙承担;当加载在天然牙上时,其应变值要小于加载在天然牙单冠的应变值,部分负荷为种植体承担;(2)种植体-天然牙联合固定桥时,加载在天然牙基牙上时,应力由种植体和天然牙共同承担;而加载在种植体上基牙时,应力基本由种植体承担;(3)提示临床上种植体-天然牙联合固定桥修复是可行的。
[Abstract]:Background: the stress distribution patterns of natural teeth and implants are different. Objective: to analyze the distribution of stress and strain between implant bone interface and periodontal region of natural teeth by vertical loading on implants, natural tooth monocoronals and implant-natural tooth support fixation bridges. Methods: two adult male Beagle dogs were selected and the right first mandibular molars were extracted under general anesthesia. A Straumann 3.3 mm 脳 10 mm conventional cervical implant was implanted in the extraction area 3 months later. After 3 months of anesthesia, the intact mandible was removed from the soft tissue. One dog was repaired with the fourth double crown of right mandible and single crown of implant, the other dog was repaired with combined crown. The mandible was immobilized on the loading device with self-coagulating plastic and the strain film was attached to the cortical bone of the buccal and lingual side corresponding to the implant and the natural tooth neck and the corresponding resistive compensation film was applied to the mandible. The occlusal surfaces of implants, natural dental crowns and implant-natural fixed abutments were subjected to vertical loading with force of 40,60,80120 and 160N, respectively. Results and conclusion (1) when the implant was loaded on the implant, the strain value was smaller than the strain value on the single crown of the implant, part of the load was borne by the natural tooth, and when the implant was loaded on the natural tooth, the strain value of the implant was less than that of the implant. The strain value should be less than the strain value of the natural tooth under single crown, and the stress of the implant and the natural tooth should be borne by both the implant and the natural tooth when it is loaded on the natural abutment when the partial load is the implant-bearing joint fixation bridge. When the abutment is loaded on the implant, the stress is basically borne by the implant. 3) it is suggested that the implant-natural tooth fixation bridge is feasible in clinic.
【作者单位】： 广州医科大学附属第三医院荔湾医院口腔科;中山大学附属第一医院口腔科;
【基金】：广东省科技厅社会发展项目(2012B061700066)~~
【分类号】：R318.01;R783.6
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本文编号：1921027