Miyata T, Kobayashi Y, Araki H, Ohto T, Shin K
Department of Periodontology, Meikai University School of Dentistry, Saitama, Japan.
Int J Oral Maxillofac Implants. 2000 May-Jun;15(3):425-31.
The influence of experimental occlusal overload on peri-implantitis in monkeys (Macaca fascicularis) has been examined to explain the pathology of the disease that develops in the tissue around osseointegrated implants. In the first article of this series, it was reported that bone resorption was not observed around implants when occlusal trauma was produced by a super-structure that was in supraocclusal contact with an excess occlusal height of approximately 100 microns, provided there was no inflammation in the peri-implant tissue. In the second part of the study, experimental inflammation was created in the peri-implant tissue, and occlusal overload was produced by a superstructure with an excess occlusal height of 100 microns. Notable bone resorption was observed around the implant with the passage of time. These results suggested that, in addition to the control of inflammation in peri-implant tissue, traumatic occlusion may play a role in bone breakdown around the implant. In the present study, while the peri-implant tissue was kept in an inflammation-free state, bone level changes around the implants were investigated when various levels of traumatic force were exerted. The supraoccluding prostheses were defined as excessively high by 100 microns, 180 microns, and 250 microns, respectively. The heights were determined with an image analysis device, and the bone responses around the implants induced by the traumatic forces were investigated. The results showed that bone resorption around implants tended to increase with 180 microns or more excessive height of the superstructure. This suggests that the threshold of excessive height of the superstructures at which peri-implant tissue breakdown may start is approximately 180 microns. It is also suggested that there is a possibility of bone resorption around the implants caused by excess occlusal trauma, even when there is no inflammation in peri-implant tissue.
为了解释在骨结合种植体周围组织中发生的疾病的病理情况，研究人员对实验性咬合负荷过重对猕猴（食蟹猴）种植体周围炎的影响进行了研究。在本系列的第一篇文章中，报告称，当由一个超结构产生咬合创伤时，如果种植体周围组织没有炎症，且该超结构与咬合面的接触超出咬合高度约100微米，则在种植体周围未观察到骨吸收。在该研究的第二部分中，在种植体周围组织中引发了实验性炎症，并通过一个咬合高度超出100微米的超结构产生了咬合负荷过重的情况。随着时间的推移，在种植体周围观察到了明显的骨吸收。这些结果表明，除了控制种植体周围组织的炎症外，创伤性咬合可能在种植体周围的骨破坏中起作用。在本研究中，在种植体周围组织保持无炎症状态的情况下，当施加不同水平的创伤力时，研究了种植体周围的骨水平变化。超咬合假体分别被定义为过高100微米、180微米和250微米。通过图像分析设备确定高度，并研究了由创伤力引起的种植体周围的骨反应。结果表明，当超结构的高度过高180微米或更多时，种植体周围的骨吸收倾向于增加。这表明，种植体种植体周围组织破坏可能开始的超结构过高高度阈值约为180微米。这也表明，即使种植体周围组织没有炎症，过大的咬合创伤也有可能导致种植体周围的骨吸收。
