Calvo Guirado Jose Luis, Lucero-Sánchez Aldo Fabian, Boquete Castro Ana, Abboud Marcus, Gehrke Sergio, Fernández Dominguez Manuel, Delgado Ruiz Rafael Arcesio
Faculty of Health Sciences, Department of Oral and Implant Dentistry, Universidad Católica San Antonio de Murcia (UCAM), 30107 Murcia, Spain.
College of Dentistry, Department of Digital Dentistry, University of Kentucky, Lexington, KY 40506-0001, USA.
Materials (Basel). 2018 Jan 12;11(1):119. doi: 10.3390/ma11010119.
The aim of this study was to evaluate the soft tissue thickness and marginal bone loss around dental implants with sloped micro-threaded shoulder (30° angle) in comparing with conventional design, inserted 30° degrees angulated in post extraction sockets and immediate loaded with temporary prosthesis simulating the all-on-four protocol. Six fox hound dogs received forty-eight post extraction dental implants with the different diameter and length (Medentika, Germany), but with different neck configurations. Two group of implants were inserted 1mm subcrestal [corrected]. Control group has a micro-threaded neck and the Test group has a sloped microthreaded neck. Immediate loading was applied using a constructed metallic structure. After three months, soft and hard tissue levels were assessed by histomorphometric analysis. The mean soft tissue thickness (STT) was 2.5 ± 0.2 mm for the Control group and 3.3 ± 0.3 mm for Test group ( = 0.036), meanwhile the mean marginal bone loss (MBL) was 1.53 ± 0.34 mm for Control group and, 1.62 ± 0.22 mm for Test group ( > 0.05). Within the limitations of this experimental model in dogs, the findings showed that dental implants with microthreaded and microthreaded sloped necks installed in immediate post extraction sites with immediate load, presented a comparable perimplant tissue behavior.
本研究的目的是评估带有倾斜微螺纹肩部（30°角）的牙科种植体周围的软组织厚度和边缘骨丢失情况，并与传统设计进行比较。这些种植体以30°角植入拔牙后的牙槽窝中，并立即加载临时修复体以模拟全口四颗种植体方案。六只猎狐犬接受了48颗不同直径和长度（德国Medentika公司生产）但颈部结构不同的拔牙后牙科种植体。两组种植体均植入牙槽嵴顶下1mm处[已修正]。对照组种植体颈部为微螺纹设计，试验组种植体颈部为倾斜微螺纹设计。使用构建的金属结构进行即刻加载。三个月后，通过组织形态计量学分析评估软硬组织水平。对照组的平均软组织厚度（STT）为2.5±0.2mm，试验组为3.3±0.3mm（P = 0.036），同时对照组的平均边缘骨丢失（MBL）为1.53±0.34mm，试验组为1.62±0.22mm（P>0.05）。在该犬类实验模型的局限性内，研究结果表明，即刻加载植入拔牙后即刻位点的微螺纹和倾斜微螺纹颈部牙科种植体，其种植体周围组织行为具有可比性。
