Pirker W, Kocher A
Alfred Kocher, Medical University Vienna, Waehringerguertel 18-20, 1090 Vienna, Austria.
Int J Oral Maxillofac Surg. 2008 Mar;37(3):293-5. doi: 10.1016/j.ijom.2007.11.008. Epub 2008 Feb 12.
This report demonstrates the successful clinical use of a modified root-analogue zirconia implant for immediate single tooth replacement. A right maxillary premolar was removed and a custom-made, root-analogue, roughened zirconia implant with macro-retentions in the interdental space was fabricated and placed into the extraction socket 4 days later. Four months after root implantation a composite crown was cemented. No complications occurred during the healing period. An excellent esthetic and functional result was achieved with the composite crown. No clinically noticeable bone resorption or soft-tissue recession was observed at 26 months follow up. Significant modifications such as macro-retentions seem to indicate that primary stability and excellent osseointegration of immediate root-analogue zirconia implants can be achieved, while preventing unesthetic bone resorption. The macro-retentions must be limited to the interdental space to avoid fracture of the thin buccal cortex. This successful case warrants further clinical research in well controlled trials.
本报告展示了一种改良的根形氧化锆种植体在即刻单颗牙替换中的成功临床应用。拔除右上颌前磨牙，4天后制作并植入定制的、带有牙间隙宏观固位结构的根形、表面粗糙的氧化锆种植体。植体植入4个月后粘结复合树脂冠。愈合期未发生并发症。复合树脂冠获得了极佳的美学和功能效果。随访26个月时未观察到临床上明显的骨吸收或软组织退缩。诸如宏观固位结构等显著改良似乎表明，即刻根形氧化锆种植体可实现初期稳定性和良好的骨结合，同时防止不美观的骨吸收。宏观固位结构必须限于牙间隙，以避免薄颊侧皮质骨骨折。这一成功案例值得在严格控制的试验中开展进一步的临床研究。
