Collaert Bruno, De Bruyn Hugo
Center for Periodontology and Implantology Brussels, Brussels, Belgium.
Clin Implant Dent Relat Res. 2002;4(3):133-5. doi: 10.1111/j.1708-8208.2002.tb00163.x.
A change in implant placement has emerged recently from two-stage to one-stage surgery and to earlier and even immediate loading of the fixtures.
The aim of this study was to verify whether four or five fixtures installed in the edentulous mandible were suitable for early loading with a cross-arch fixed restoration.
In 25 consecutively treated patients (28-88 yr), four or five Astra Tech fixtures (Mölndal, Sweden) were installed in edentulous mandibles. During the same surgical procedure, the abutments were connected. An impression was taken immediately after surgery. All patients received a fixed prosthetic rehabilitation of 10 to 12 teeth made of a cast metal framework and acrylic teeth/gingiva within a month. The fixtures were followed up clinically and radiographically for 7 to 24 months. Bone level was measured from the most coronal point of the vertical part of the fixture to the most apical bone level mesially or distally.
No fixtures were lost during follow-up. No postoperative complications occurred. Radiographic analysis showed a mean bone level of 0.6 mm after 7 to 12 months. Fixtures followed up from 13 to 18 and 19 to 24 months showed a mean bone level of 0.7 mm. Around two fixtures, the bone level was found at the first implant thread. All other fixtures showed the bone level somewhere along the vertical unthreaded part of the fixture.
Early loading within 1 month of four or five Astra Tech fixtures in the edentulous mandible is a predictable procedure for a follow-up period of 6 to 24 months.
近年来，种植体植入方式已从两阶段手术转变为一阶段手术，并发展到更早甚至即刻加载种植体。
本研究旨在验证在下颌无牙区植入4颗或5颗种植体是否适合早期加载进行跨牙弓固定修复。
连续纳入25例患者（年龄28 - 88岁），在下颌无牙区植入4颗或5颗Astra Tech种植体（瑞典莫恩达尔）。在同一手术过程中连接基台。术后立即取印模。所有患者在1个月内接受了由铸造金属框架和丙烯酸牙/牙龈制成的10至12颗牙的固定修复。对种植体进行7至24个月的临床和影像学随访。测量从种植体垂直部分的最冠方点到近中或远中最根尖骨水平的骨水平。
随访期间无种植体丢失。未发生术后并发症。影像学分析显示，7至12个月后平均骨水平为0.6 mm。随访13至18个月以及19至24个月的种植体平均骨水平为0.7 mm。在两颗种植体周围，骨水平位于第一个种植体螺纹处。所有其他种植体的骨水平位于种植体垂直无螺纹部分的某处。
在下颌无牙区植入4颗或5颗Astra Tech种植体后1个月内进行早期加载，在6至24个月的随访期内是一种可预测的方法。
