Novaes Arthur B, de Oliveira Rafael R, Taba Júnior Mário, de Souza Sérgio L S, Palioto Daniela B, Grisi Márcio F M, Papalexiou Vula
Department of Bucco Maxillo Facial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
J Oral Implantol. 2005;31(6):276-82. doi: 10.1563/1548-1336(2005)31[276:CBLMWF]2.0.CO;2.
Initial breakdown of the implant-tissue interface generally begins at the crestal region in successfully osseointegrated implants. The purpose of this study was to evaluate the effect on crestal bone loss (CBL) around implants specially developed for immediate loading with a unique crestal drill. After 8 weeks postextraction, 6 young male mongrel dogs received 48 implants (XiVE) in the region corresponding to the 4 mandibular premolars. The implant sites were prepared according to the manufacturer's protocol with conventional standard drills. Before implant placement, the crestal drill was used in the experimental group but not in the control group. After a healing period of 12 weeks, the dogs were sedated and euthanized. Through linear measurements, from the top of the implant to the first bone-implant contact, the amount of CBL was determined. The histomorphometric results of CBL (mean +/- SEM) were 0.88 +/- 0.13 mm (range 0.0-3.0 mm) in the experimental group and 1.69 +/- 0.17 mm (range 0.0-4.2 mm) in the control group. The difference was statistically significant (P < .05) when the implants were used as the experimental units. The statistical analysis also revealed significance when the dogs were used as the experimental units (P < .05). When the median was used for analyses, the CBL was 0.44 mm for the experimental group and 1.91 mm for the control group. Crestal bone loss was minimized when the crestal preparation protocol was carefully followed by using the osseocondensating XiVE implant system.
在成功实现骨结合的种植体中，种植体 - 组织界面的初始破坏通常始于嵴顶区域。本研究的目的是评估一种专门为即刻负重设计的独特嵴顶钻对种植体周围嵴顶骨吸收（CBL）的影响。拔牙后8周，6只年轻雄性杂种犬在对应于4颗下颌前磨牙的区域植入48颗种植体（XiVE）。种植体植入部位按照制造商的方案用传统标准钻进行制备。在种植体植入前，实验组使用嵴顶钻，而对照组未使用。经过12周的愈合期后，对犬实施镇静并安乐死。通过线性测量，从种植体顶部到首次骨 - 种植体接触点，确定CBL的量。实验组CBL的组织形态计量学结果（均值±标准误）为0.88±0.13mm（范围0.0 - 3.0mm），对照组为1.69±0.17mm（范围0.0 - 4.2mm）。以种植体作为实验单位时，差异具有统计学意义（P < 0.05）。当以犬作为实验单位时，统计分析也显示出显著性（P < 0.05）。当使用中位数进行分析时，实验组的CBL为0.44mm，对照组为1.91mm。通过小心遵循嵴顶制备方案并使用骨挤压式XiVE种植系统，嵴顶骨吸收可降至最低。
