Influence of Implant Distribution and Palatal Coverage on the Strain of Splinted Implant and Overdenture in Maxillary Implant Overdentures
Influence of Implant Distribution and Palatal Coverage on the Strain of Splinted Implant and Overdenture in Maxillary Implant Overdentures
复制标题
上颌种植覆盖义齿中种植体分布和腭部覆盖对夹板种植体和覆盖义齿应变的影响
DOI：
10.11607/jomi.8558
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发表时间：
2021
影响因子：
2
通讯作者：
Ikebe K
中科院分区：
文献类型：
--
作者：
Nishimura Y;Takahashi T ,Gonda T;Ikebe K
目的：摘要临床上已广泛使用夹板式附着体的种植覆盖义齿，而夹板式附着体对种植体的影响亦有报道。然而，超过四个种植体的种植体配置和覆盖义齿覆盖腭的效果还没有得到充分的研究。本研究旨在探讨种植体形态及腭部覆盖对种植体及义齿应变的影响。材料和方法：在上颌无牙颌模型中，将6个种植体放置在前牙区、前磨牙区和磨牙区。将四个应变计连接到种植体表面，并使用Dolder杆附件来夹持分布在各种配置中的种植体。制作了两种类型的上颌实验义齿（有/无腭覆盖），并在中线处连接了两个应变片。施加98 N的垂直载荷，测量义齿和种植体上的应变。采用单因素方差分析和t检验比较应变测量值（P=. 05）。结果如下：当比较种植体应变时，当使用6个种植体时，前牙和前磨牙种植体上的应变显著较小，但不同种植体配置之间在磨牙种植体上的应变没有显著差异。无腭覆盖义齿前牙种植体的应变明显大于腭覆盖义齿。当使用四个种植体时，无腭的义齿腭侧的应变显著大于有腭覆盖的义齿。当使用六个种植体时，两种类型的义齿两侧的应变没有显著差异。结论：当种植体相互夹板使用义齿没有腭覆盖，当使用六个或两个前和两个后种植体义齿的应变较低。两种类型义齿的应变在使用六种种植体时差异不显著，但在所有其他构型时差异显著。此外，无论种植体构型如何，两种义齿之间的种植体应变差异在前牙种植体中是显著的。
Purpose: Implant overdentures with splinted attachments have been used in clinical practice, and the effect of splinting on implants has been reported frequently. However, the effect of implant configuration of more than four implants and covering the palate with an overdenture has not been sufficiently examined. The purpose of this study was to reveal the effects of implant configuration and palatal coverage on both implant and denture strain in maxillary implant overdentures using splinted implants. Materials and Methods: Six implants were placed in the anterior, premolar, and molar areas in a maxillary edentulous model. Four strain gauges were attached to the implant surface, and Dolder bar attachments were used to splint implants distributed in various configurations. Two types of maxillary experimental dentures (with/without palatal coverage) were fabricated, and two strain gauges were attached at the midline. A vertical load of 98 N was applied, and the strains on the dentures and implants were measured. The strain measurements were compared using one-way analysis of variance and t test (P=. 05). Results: When comparing the implant strains, the strain was significantly smaller on the anterior and premolar implants when six implants were used, but there was no significant difference among the different implant configurations in the strain on the molar implants. Strains on anterior implants of the palateless overdenture were significantly greater than those of the overdenture with palatal coverage. When four implants were used, the strain on the palatal side of dentures without palate was significantly greater than that on those with palatal coverage. When six implants were used, there was no significant difference in the strain on either side between two types of dentures. Conclusion: When implants were splinted to each other using a denture without palatal coverage, the strain of dentures when six or two anterior and two posterior implants were used was lower. The difference of denture strains between two types of dentures was not significant when six implants were used, but was significant for all other configurations. Also, the difference of implant strains between two dentures was significant in anterior implants regardless of implant configuration.