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In dentistry, platform switching is a method used to preserve alveolar bone levels around dental implants. The concept refers to placing screwed or friction fit restorative abutments of narrower diameter on implants of wider diameter, rather than placing abutments of similar diameters, referred to as ''platform matching''. Discovered by accident in the late 1980s, the benefits of platform switching have become the focus of implant-related research with increasing frequency. Numerous peer-reviewed articles and recent systematic reviews have revealed that platform switching can be considered a means of preventing initial peri-implant bone loss. ==Concept== After being placed in a surgical procedure, dental implants undergo osseointegration, during which time the surrounding bone grows into intimate contact with the surface of the implants and the implants become fused to the bone. When this process has been deemed to have occurred to a sufficient extent, the implants are fitted with restorative abutments in order to allow dental restorations (e.g. crowns, dentures, etc.) to be cemented on, screwed down or otherwise attached. Historically, the diameter of the abutment matched the diameter of the implant platform; for example, a 4.8 mm-wide abutment was placed on a 4.8 mm-wide implant—this can be termed ''platform-matching''.〔Canullo L, et al. Platform switching and marginal bone-level alterations: The results of a randomized-controlled trial, ''Clin Oral Implants Res'' 2010;21:115-121.〕 When ''platform switching'', a narrower abutment diameter for a given implant platform diameter is used; for example, a 4.8 mm-wide implant may be restored with a 3.8 mm-wide or 4.2 mm-wide abutment.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Platform switching」の詳細全文を読む スポンサード リンク
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