To determine implant survival and success of four conventionally but initially asynchronously loaded implants in implant-supported overdentures for the edentulous maxilla, in participants with opposing mandibular two-implant overdentures.

中文翻译：

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两个或四个种植体上的上颌种植覆盖义齿。一项关于种植体和义齿成功和生存的前瞻性随机交叉临床试验

确定四个传统但最初异步加载的种植体在上颌无牙颌覆盖义齿中的种植体存活率和成功率，在具有对立下颌双种植体覆盖义齿的参与者中。