【摘要】：目的：兩個(gè)種植體支持的下頜種植覆蓋義齒能為無(wú)牙頜患者提供有效的修復(fù)方式,本研究的目的是通過(guò)三維有限元法對(duì)比分析下頜雙種植體支持的三種不同類型的磁性覆蓋義齒的生物力學(xué)特點(diǎn),為優(yōu)化下頜雙種植體支持的磁性覆蓋義齒的設(shè)計(jì)及臨床修復(fù)提供理論依據(jù)。方法：本研究共建立三個(gè)不同的有限元模型,包含兩個(gè)種植體支持的下頜種植磁性覆蓋義齒,設(shè)計(jì)了平面型、圓頂型和襯墊型三種不同磁性附著體來(lái)支持覆蓋義齒。對(duì)每個(gè)模型的覆蓋義齒施加四種不同的加載力：100 N垂直向加載在下頜切牙、100 N垂直向加載在右下尖牙、100N垂直向及傾斜向(頰舌向傾斜450)加載在右下第一磨牙。記錄并分析了種植體周圍骨質(zhì)、基臺(tái)及粘膜上的應(yīng)力特征。結(jié)果：在所有加載條件下,平面型磁性覆蓋義齒修復(fù)時(shí)修復(fù)體組件及其支持組織上的應(yīng)力比圓頂型及襯墊型大；磨牙傾斜加載時(shí),顯示的應(yīng)力值為垂直向的三倍；此時(shí)粘膜的形變也是最明顯,為其他加載條件下的三倍。結(jié)論：與平面型磁性附著體相比,圓頂型和襯墊型磁性附著體顯示了更合理的應(yīng)力／應(yīng)變分布；對(duì)所有的種植磁性覆蓋義齒而言,斜向力的危害最大,能造成種植體周圍骨組織及附著體的應(yīng)力集中,并且能破壞義齒的穩(wěn)定性；這些結(jié)果表明：對(duì)于雙種植體支持的下頜種植磁性覆蓋義齒而言,圓頂型和襯墊型磁性附著體為更佳選擇,特別是對(duì)骨質(zhì)疏松或者骨質(zhì)缺陷的患者而言。
[Abstract]:Objective: two implant-supported overdentures can provide an effective method for the restoration of edentulous patients. The purpose of this study was to compare and analyze the biomechanical characteristics of three different types of magnetic overdentures supported by two mandibular implants by using three-dimensional finite element method. It provides theoretical basis for optimizing the design and clinical restoration of magnetic overdenture supported by mandibular double implants. Methods: in this study, three different finite element models were established, including two implant-supported mandibular implants with magnetic overdentures. Three kinds of magnetic attachments were designed to support the overdentures: plane type, dome type and cushion type. Four different loading forces were applied to the overdenture of each model: 100 N vertical loading on the mandibular incisor, 100 N vertical loading on the right lower canine, and 100 N vertical and oblique (buccal and lingual tilt 450) loading on the lower right first molar. Stress characteristics of bone, base and mucosa around implants were recorded and analyzed. Results: under all the loading conditions, the stress of the prosthesis and its supporting tissue was larger than that of the dome and liner, and the stress value of the molars was three times that of the vertical. At this time, the deformation of mucous membrane is also the most obvious, which is three times as much as that under other loading conditions. Conclusion: compared with planar magnetic attachments, dome and liner magnetic attachments show more reasonable stress / strain distribution. For all implant-magnetic overdentures, the oblique force is the most harmful, which can cause stress concentration in the bone tissue and attachment around the implant, and destroy the stability of the denture. These results suggest that the domed and padded magnetic attachments are a better choice for mandibular implant-supported magnetic overdentures, especially for patients with osteoporosis or bone defects.
【學(xué)位授予單位】：復(fù)旦大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：R783.6

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本文編號(hào)：2390723