Meijer Henny J A, Batenburg Rutger H K, Raghoebar Gerry M, Vissink Arjan
Department of Oral and Maxillofacial Surgery and Maxillofacial Prosthodontics, Groningen University Hospital, Groningen, The Netherlands.
J Clin Periodontol. 2004 Jul;31(7):522-6. doi: 10.1111/j.1600-051X.2004.00510.x.
The aim of this prospective comparative study was to evaluate the survival rate and the condition of the peri-implant tissues of the IMZ implant system (two-stage cylindertype), the Brånemark implant system (two-stage screwtype) and the ITI implant system (one-stage screwtype) supporting a mandibular overdenture during a 5-year follow-up period.
Three groups of 30 edentulous patients were treated with two endosseous implants in the interforaminal region of the mandible. Clinical and radiographic parameters were evaluated immediately after completion of the prosthetic treatment and after 1, 2, 3, 4 and 5 years of functional loading.
The five-year survival rate is 98.3% for the IMZ group, 98.3% for the Brå group and 100% for the ITI group. Mean scores on indices for plaque, calculus, gingiva and bleeding were very low at all evaluation periods. Mean marginal bone loss over a period of 5 years, was 1.4 mm for the IMZ group, 0.7 mm for the Brå group and 0.9 mm for the ITI group.
It is concluded that two implants placed in the interforaminal region, connected with a bar, supply a proper base for the support of a mandibular overdenture in the edentulous patient. After 5 years no clinically relevant and statistically significant radiographic changes had developed between the three implant systems.
本前瞻性对照研究旨在评估IMZ种植体系统（两阶段圆柱型）、Brånemark种植体系统（两阶段螺旋型）和ITI种植体系统（一阶段螺旋型）在下颌覆盖义齿修复中，经过5年随访期后的存活率及种植体周围组织状况。
选取三组共30例无牙颌患者，在下颌孔间区域植入两颗骨内种植体。在修复治疗完成后以及功能负载1、2、3、4和5年后，对临床和影像学参数进行评估。
IMZ组的五年存活率为98.3%，Brånemark组为98.3%，ITI组为100%。在所有评估期，菌斑、牙石、牙龈和出血指数的平均得分都很低。IMZ组5年期间的平均边缘骨吸收为1.4mm，Brånemark组为0.7mm，ITI组为0.9mm。
得出结论，在下颌孔间区域植入两颗种植体并连接横杆，可为无牙颌患者下颌覆盖义齿的支持提供合适的基础。5年后，三种种植体系统之间未出现临床上相关且具有统计学意义的影像学变化。
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