歯石様石灰化物の付着を認めたHAコーティングインプラントの撤去症例について : SEM,EPMA,WDXによる観察 Removed Case of HA-coated Implant Which Showed Deposition of Calculus-like Mass : Observation on It's Surface by SEM, EPMA and WDX

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Hydroxyapatite (HA)-coated implants have been a subject of great interest since the mid-1980 s. Various clinical studies have shown that HA-coatings lead to good clinical results over a 15-year period. Statistics with a success rate of 95% were reported over a 5-year period. More recently, however, an increased number of failures with HA-coated implants have been reported.<br/> One case of an HA-coated implant, which had to be removed due to implant mobility, marginal swelling and redness, and marginal bone loss (funnel-shaped resorption) around the implant, at 4 years after the implant had been placed, in a 48-year-old male patient, was reported. An explanted HA-coated titanium cylinder-form implant was examined, using scanning electron microscopy (SEM) and an electron probe X-ray microanalyzer (EPMA) to analize the main constructive elements. Also, soft tissue removed from the implant socket was microscopically examined.<br/> The results were as follows<br/> 1. The removed implant demonstrated, macroscopically and microscopically, a dental calculus-like deposit on the plasma-sprayed surface, and loss of the HA-coating, with the presence of a smooth titanium substrate.<br/> 2. The loss of HA-coating was seen within the hole of the apical end of the implant.<br/> 3. For the EPMA data, the implant material mainly consisted of titanium, with a loss of the HA-coated layer. The dental calculus-like deposit chiefly consisted of calcium and phosphate, and showed no bone structure.<br/> 4. Microscopic examination revealed that granulation tissue replaced the resorbed bone and was separated from the implant itself by proliferating squamous epithelium. Epithelium proliferated apically to the encapsulated granulation tissue. The granulation tissue that resulted from the inflammatory process began marginally and followed the bacterial movement; the process proceeded rapidly with the loss of an implant.<br/> From the above results, marginal bone loss may be induced by etiologic factors known to be causative, such as bacterial infection and mechanical overload. The most important factors for preventing late complications with implant-prosthetic treatment are the peri-implant osseous and soft tissue conditions. A check of the implant-borne suprastructure is essential. A thorough cleaning of the implant, as well as any remaining natural teeth of the patient who receives implant-prosthetic treatment, is necessary.<br/>

収録刊行物

  • 日本口腔インプラント学会誌 = Journal of Japanese Society of Oral Implantology

    日本口腔インプラント学会誌 = Journal of Japanese Society of Oral Implantology 14(3), 83-91, 2001-09-30

    公益社団法人 日本口腔インプラント学会

参考文献:  41件中 1-41件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    10008136994
  • NII書誌ID(NCID)
    AN10072606
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09146695
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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