インプラント周囲組織に対する一考察

DOI 参考文献29件

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タイトル別名
  • A Consideration for Peri-Implant Tissue
  • ―GBR応用例について―
  • ―Application of Guided Bone Regeneration―

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When dental implants are placed in esthetically important areas, their prognosis is likely to be affected by securement of bone volume and considerations on soft tissue. The application of guided bone regeneration (GBR) at implant installation can be divided into simultaneous approaches and staged approaches depending on the timing of the application, and either approach is selected clinically according to bone loss conditions.<br/> If enough bone volume can be secured, the vertical position of implants tends to be deep, in order to provide a superstructure with an esthetic and appropriate contour which resembles that of natural teeth.<br/> In order to study the prognosis of dental implants with which GBR techniques were applied, we compared GBR simultaneous and staged approaches and investigated the relationship between the degree of inflammation of peri-implant tissue and the peri-implant probing depth, the distance measured from the marginal mucosa around the dental implant and the abutment connecting part, or the fixture top.<br/> The following measurements were obtained:<br/> 1. Peri-implant marginal bone resorption<br/> 2. Implant Crevicular Fluid (ICF)<br/> 3. Plaque Index (PLI)<br/> 4. Implant Probing Depth (IPD), the distance between the marginal mucosa around the dental implant and the fixture-abutment-connecting surface.<br/> For the statistical analysis, the Mann-Whitney test and Wilcoxon test were used for intergroup comparison, and regression analysis was adopted for correlation analysis.<br/> The results were as follows:<br/> 1. In the comparison between GBR simultaneous and staged approaches, no statistically significant difference was seen in terms of peri-implant marginal bone resorption, peri-implant marginal mucosal recession, and ICF.<br/> 2. Correlation was confirmed (r=0.823) between IPD and ICF after three years.<br/> 3. Correlation was not observed (r=0.440) between peri-implant marginal bone resorption and ICF.<br/> 4. Correlation was not observed (r=0.118) between peri-implant marginal bone resorption and PLI.<br/> The above-mentioned results suggest that there is no clinical difference in the prognosis of peri-implant conditions when implants were installed by either simultaneous or staged GBR application based on conventional clinical criteria for preoperative bone loss. There were few cases of inflammation of peri-implant when the depth from the peri-implant marginal mucosa to the abutment-connecting surface, or the fixture top, was shallower.<br/>

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