Meijer Henny J A, Heijdenrijk Kees, Raghoebar Gerry M
Department of Oral and Maxillofacial Surgery and Maxillofacial Prosthetics, Groningen University Hospital, The Netherlands.
Int J Prosthodont. 2003 Jul-Aug;16(4):397-402.
The aim of this prospective clinical trial was to compare peri-implant clinical and radiographic parameters following the placement of nonsubmerged two- and one-stage implants.
Patients were randomly assigned to the IMZ group (20 patients receiving two IMZ two-stage implants in a one-stage procedure) or ITI group (20 patients receiving two ITI implants in the conventional one-stage procedure). The healing period was defined as an 18-week unloaded osseointegration period and a 1-year functional period during which maturation of bone took place. Twelve weeks after implant placement, fabrication of an overdenture with a bar-clip attachment system was started; it was placed at 18 weeks.
None of the implants were lost during the osseointegration period; one IMZ implant was removed during the functional period because of mobility. There was no significant difference in Gingival Index between the two groups at all evaluation periods. The mean bone loss during the functional period was 0.6 mm in both groups. A high number of healing abutments loosened in the IMZ group.
Clinical and radiographic parameters of two-stage implants placed in a one-stage procedure and one-stage implants are comparable during the healing period. Healing abutments of the IMZ implant system loosen easily.
这项前瞻性临床试验的目的是比较非潜入式两段式和一段式种植体植入后的种植体周围临床和影像学参数。
患者被随机分配到IMZ组（20例患者在一期手术中接受两枚IMZ两段式种植体）或ITI组（20例患者在传统一期手术中接受两枚ITI种植体）。愈合期定义为18周的无负载骨整合期和1年的功能期，在此期间骨发生成熟。种植体植入12周后，开始制作带有杆夹附着系统的覆盖义齿；在18周时放置。
在骨整合期内没有种植体丢失；在功能期，一枚IMZ种植体因松动而被取出。在所有评估期，两组之间的牙龈指数没有显著差异。功能期两组的平均骨吸收均为0.6mm。IMZ组有大量愈合基台松动。
在愈合期，一期手术植入的两段式种植体和一段式种植体的临床和影像学参数具有可比性。IMZ种植体系统的愈合基台容易松动。
