Schwarz Frank, Herten Monika, Bieling Katrin, Becker Jürgen
Department of Oral Surgery, Westdeutsche Kieferklinik, Heinrich Heine University, Düsseldorf, Germany.
Int J Oral Maxillofac Implants. 2008 Mar-Apr;23(2):335-42.
The aim of the present study was to histomorphometrically investigate crestal bone changes at nonsubmerged implants (Camlog) with different machined collar lengths in a dog model.
One-stage insertion of sandblasted acid-etched screw-type implants with machined neck sizes of 1.6 mm (CAM) and 0.4 mm (CAM+) was performed in the mandibles of 4 beagle dogs. Both types of implants were inserted so that the implant shoulder (IC) exceeded the alveolar crest for 0.4 mm. Placement was followed by the connection of standard abutments. The animals were sacrificed after 2 and 12 weeks. Dissected blocks were processed for histomorphometric analysis (eg, distance between IC and the coronal extension of bone-implant contact [CBI], the distance between IC and the apical extension of the inflammatory cell infiltrate, and the percentage of bone-implant contact).
Histomorphometric analysis revealed significantly increased mean IC-CBI (CAM: 2.4 +/- 0.3 mm; CAM+: 1.6 +/- 0.1 mm) and BIC (CAM: 77%; CAM+: 80%) values in both groups at 12 weeks. However, mean IC-CBI values were significantly higher in the CAM group (P < .01). An inflammatory cell infiltrate was localized to the implant-abutment interface of both CAM and CAM+ implants, and BC was clearly separated from alCT by a subepithelial connective tissue zone.
Within the limits of the present study, it was concluded that (1) rough-surfaced implant necks reduced crestal bone level changes after 12 weeks of healing, and (2) microbial leakage apparently did not contribute to the marginal bone resorption in either group.
本研究旨在通过组织形态计量学方法，在犬模型中研究不同机械加工颈部长度的非潜入式种植体（Camlog）嵴顶骨的变化情况。
对4只比格犬的下颌骨进行一期植入喷砂酸蚀螺纹型种植体，其机械加工颈部尺寸分别为1.6 mm（CAM）和0.4 mm（CAM+）。两种种植体植入时均使种植体肩部（IC）超出牙槽嵴0.4 mm。植入后连接标准基台。在2周和12周后处死动物。对解剖后的骨块进行组织形态计量学分析（例如，IC与骨-种植体接触的冠向延伸（CBI）之间的距离、IC与炎性细胞浸润的根尖延伸之间的距离以及骨-种植体接触百分比）。
组织形态计量学分析显示，两组在12周时平均IC-CBI（CAM：2.4±0.3 mm；CAM+：1.6±0.1 mm）和BIC（CAM：77%；CAM+：80%）值均显著增加。然而，CAM组的平均IC-CBI值显著更高（P <.01）。炎性细胞浸润定位于CAM和CAM+种植体的种植体-基台界面，并且BC通过上皮下结缔组织区与alCT明显分离。
在本研究的范围内，得出以下结论：（1）粗糙表面的种植体颈部在愈合12周后减少了嵴顶骨水平的变化，（2）微生物渗漏显然对两组的边缘骨吸收均无影响。
