Cocchetto Roberto, Traini Tonino, Caddeo Floriana, Celletti Renato
Dental School, University G d'Annunzio, Chieti-Pescara, Italy.
Int J Periodontics Restorative Dent. 2010 Apr;30(2):163-71.
The use of a narrower-diameter abutment over a larger-diameter implant platform has been shown to decrease peri-implant bone resorption. This technique, known as platform switching, shifts the implant-abutment microgap inward. The aim of this study was to examine whether shifting the microgap further inward by increasing the discrepancy between the implant platform and abutment diameter would result in a decrease in crestal bone loss. Ten patients requiring mandibular or maxillary implant restorations were included in this study. The inclusion criteria called for an alveolar crest thickness of at least 8.0 mm at the implant placement site. Fifteen Certain PREVAIL implants with a body diameter of 5.0 mm, an expanded platform feature with a maximum diameter of 5.8 mm at the collar, and a prosthetic seating surface of 5.0 mm were used in lengths of 8.5, 10.0, 11.5, or 13.0 mm. The implants were connected to 4.1-mm healing abutments in a single-stage protocol. Periapical radiographs taken before and immediately after surgery, 8 weeks after implant placement, immediately after definitive prosthesis insertion, and at 12 and 18 months after loading revealed an average peri-implant bone loss of 0.30 mm. Increasing the discrepancy between the diameter of the implant platform and the restorative abutment may lead to a decrease in the amount of subsequent coronal bone loss.
在较大直径的种植体平台上使用较窄直径的基台已被证明可减少种植体周围骨吸收。这种技术，即平台转换，将种植体-基台微间隙向内移动。本研究的目的是检验通过增加种植体平台与基台直径之间的差异使微间隙进一步向内移动是否会导致嵴顶骨丢失减少。本研究纳入了10例需要下颌或上颌种植修复的患者。纳入标准要求种植体植入部位的牙槽嵴厚度至少为8.0mm。使用了15颗PREVAIL种植体，其体部直径为5.0mm，在颈部具有最大直径为5.8mm的扩展平台特征，修复体就位面为5.0mm，长度分别为8.5、10.0、11.5或13.0mm。种植体通过单阶段方案连接到4.1mm的愈合基台上。在手术前、手术后即刻、种植体植入后8周、最终修复体插入后即刻以及加载后12个月和18个月拍摄的根尖片显示，种植体周围平均骨丢失为0.30mm。增加种植体平台与修复基台的直径差异可能会导致后续冠方骨丢失量减少。
