Gehrke Sergio Alexandre, Pérez-Díaz Leticia, Mazón Patricia, De Aza Piedad N
Department of Research, Biotecnos, Cuareim 1483, Montevideo CP 11100, Uruguay.
Department of Bioengineering, Instituto de Bioingenieria, Universidad Miguel Hernández, Avda. Ferrocarril s/n, 03202 Elche (Alicante), Spain.
J Funct Biomater. 2019 Oct 25;10(4):47. doi: 10.3390/jfb10040047.
The purpose of the present study was to measure and compare the insertion torque, removal torque, and the implant stability quotient by resonance frequency analysis in different polyurethane block densities of two implant macrogeometries. Four different polyurethane synthetic bone blocks were used with three cortical thickness: Bone 1 with a cortical thickness of 1 mm, Bone 2 with a cortical thickness of 2 mm, Bone 3 with a cortical thickness of 3 mm, and Bone 4, which was totally cortical. Four groups were created in accordance with the implant macrogeometry (n = 10 per group) and surface treatment: G1-regular implant design without surface treatment; G2-regular implant design with surface treatment; G3-new implant design without surface treatment; G4-new implant design with surface treatment. All implants used were 4 mm in diameter and 10 mm in length and manufactured in commercially pure titanium (grade IV) by Implacil De Bortoli (São Paulo, Brazil). The implants were installed using a computed torque machine, and following installation of the implant, the stability quotient (implant stability quotient, ISQ) values were measured in two directions using Osstell devices. The data were analyzed by considering the 5% level of significance. All implant groups showed similar mean ISQ values without statistical differences ( > 0.05), for the same synthetic bone block: for Bone 1, the value was 57.7 ± 3.0; for Bone 2, it was 58.6 ± 2.2; for Bone 3, it was 60.6 ± 2.3; and for Bone 4, it was 68.5 ± 2.8. However, the insertion torque showed similar higher values for the regular macrogeometry (G1 and G2 groups) in comparison with the new implant macrogeometry (G3 and G4 groups). The analysis of the results found that primary stability does not simply depend on the insertion torque but also on the bone quality. In comparison with the regular implant macrogeometry, the new implant macrogeometry decreased the insertion torque without affecting the implant stability quotient values.
本研究的目的是测量并比较两种种植体宏观几何形状在不同聚氨酯块密度下的植入扭矩、取出扭矩以及通过共振频率分析得出的种植体稳定性商数。使用了四种不同的聚氨酯合成骨块，其具有三种皮质厚度：皮质厚度为1毫米的骨块1、皮质厚度为2毫米的骨块2、皮质厚度为3毫米的骨块3以及完全为皮质骨的骨块4。根据种植体宏观几何形状（每组n = 10）和表面处理创建了四组：G1 - 无表面处理的常规种植体设计；G2 - 有表面处理的常规种植体设计；G3 - 无表面处理的新型种植体设计；G4 - 有表面处理的新型种植体设计。所有使用的种植体直径为4毫米，长度为10毫米，由Implacil De Bortoli（巴西圣保罗）采用商业纯钛（IV级）制造。使用计算机扭矩机安装种植体，种植体安装后，使用Osstell设备在两个方向测量稳定性商数（种植体稳定性商数，ISQ）值。数据采用5%的显著性水平进行分析。对于相同的合成骨块，所有种植体组的平均ISQ值相似，无统计学差异（P>0.05）：对于骨块1，值为57.7±3.0；对于骨块2，为58.6±2.2；对于骨块3，为60.6±2.3；对于骨块4，为68.5±2.8。然而，与新型种植体宏观几何形状（G3和G4组）相比，常规宏观几何形状（G1和G2组）的植入扭矩显示出相似的较高值。结果分析发现，初期稳定性不仅简单地取决于植入扭矩，还取决于骨质量。与常规种植体宏观几何形状相比，新型种植体宏观几何形状降低了植入扭矩，而不影响种植体稳定性商数的值。
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