Universidade Federal do Rio de Janeiro, Departamento de Odontopediatria e Ortodontia (Rio de Janeiro/RJ, Brazil).
Universidade Federal do Paraná, Departamento de Ortodontia (Curitiba/PR, Brasil).
Dental Press J Orthod. 2021 Mar 22;26(1):e211967. doi: 10.1590/2177-6709.26.1.e211967.oar. eCollection 2021.
Assess the influence of mono- and bicortical anchorage and diameter of mini-implants (MIs) on the primary stability of these devices.
60 self-drilling MIs were distributed in six groups according to diameter (1.5mm, 1.8mm or 2.0mm) and type of anchorage (monocortical and bicortical) in bovine rib. The primary stability was evaluated by insertion torque, micromobility and pull-out strength tests. ANOVA and/or Tukey analysis were used to conduct intergroup comparisons (p< 0.05). Non-parametric statistics (Kruskal-Wallis and Mann-Whitney) were performed when normality was not found (p< 0.05).
MIs with larger diameters and bicortical anchorage showed greater primary stability regarding insertion torque (p< 0.05) and micromobility (p< 0.05). Only MI diameter had an effect on the pull-out strength test. Larger diameter MIs presented better retention in pull-out strength tests (p< 0.001), regardless of mono- or bicortical anchorage.
MI primary stability is dependent on its diameter and type of anchorage. Bicortical anchorage showed greater stability when compared with monocortical anchorage, independently of other variables.
评估单皮质和双皮质固位、微型种植体（MIs）直径对这些装置初始稳定性的影响。
根据直径（1.5mm、1.8mm 或 2.0mm）和固位方式（单皮质和双皮质），将 60 个自攻型 MIs 分布在牛肋骨的 6 个组中。通过插入扭矩、微动和拔出强度测试评估初始稳定性。使用方差分析和/或 Tukey 分析进行组间比较（p<0.05）。当发现不符合正态分布时（p<0.05），使用非参数统计（Kruskal-Wallis 和 Mann-Whitney）进行分析。
在插入扭矩（p<0.05）和微动（p<0.05）方面，直径较大和双皮质固位的 MIs 具有更高的初始稳定性。只有 MI 直径对拔出强度测试有影响。较大直径的 MIs 在拔出强度测试中表现出更好的保持力（p<0.001），无论单皮质还是双皮质固位。
MIs 的初始稳定性取决于其直径和固位方式。与单皮质固位相比，双皮质固位具有更高的稳定性，而其他变量则没有影响。
