Zeno Helios A, Buitrago Renan L, Sternberger Sidney S, Patt Marisa E, Tovar Nick, Coelho Paulo, Kurtz Kenneth S, Tuminelli Frank J
Department of Graduate Prosthodontics, New York Presbyterian, Queens, NY.
Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY.
J Prosthodont. 2016 Apr;25(3):216-23. doi: 10.1111/jopr.12329. Epub 2015 Sep 30.
To compare the removal of torque values of machined implant abutment connections (internal and external) with and without soft tissue entrapment using an in vitro model.
Thirty external- and 30 internal-connection implants were embedded in urethane dimethacrylate. Porcine tissue was prepared and measured to thicknesses of 0.5 and 1.0 mm. Six groups (n = 10) were studied: External- and internal-connection implants with no tissue (control), 0.5, and 1.0 mm of tissue were entrapped at the implant/abutment interface. Abutments were inserted to 20 Ncm for all six groups. Insertion torque values were recorded using a digital torque gauge. All groups were then immersed in 1 M NaOH for 48 hours to dissolve tissue. Subsequent reverse torque measurements were recorded. Mean and standard deviation were determined for each group, and one-way ANOVA and Bonferroni test were used for statistical analysis.
All 60 specimens achieved a 20-Ncm insertion torque, despite tissue entrapment. Reverse torque measurements for external connection displayed a statistically significant difference (p < 0.05) between all groups with mean reverse torque values for the control (13.71 ± 1.4 Ncm), 0.5 mm (7.83 ± 2.4 Ncm), and 1.0 mm tissue entrapment (2.29 ± 1.4 Ncm) groups. Some statistically significant differences (p < 0.05) were found between internal-connection groups. In all specimens, tissue did not completely dissolve after 48 hours.
External-connection implants were significantly affected by tissue entrapment; the thicker the tissue, the lower the reverse torque values noted. Internal-connection implants were less affected by tissue entrapment.
使用体外模型比较有软组织嵌顿和无软组织嵌顿情况下机加工种植体基台连接（内部和外部）的扭矩去除情况。
将30个外部连接和30个内部连接种植体嵌入二甲基丙烯酸聚氨酯中。制备猪组织并测量至0.5毫米和1.0毫米的厚度。研究了六组（n = 10）：外部连接和内部连接种植体在种植体/基台界面处无组织（对照）、有0.5毫米和1.0毫米组织嵌顿。对所有六组将基台插入至20 Ncm。使用数字扭矩计记录插入扭矩值。然后将所有组浸入1 M NaOH中48小时以溶解组织。记录随后的反向扭矩测量值。确定每组的均值和标准差，并使用单因素方差分析和Bonferroni检验进行统计分析。
尽管有组织嵌顿，所有60个标本均达到20 Ncm的插入扭矩。外部连接的反向扭矩测量在所有组之间显示出统计学上的显著差异（p < 0.05），对照组（13.71 ± 1.4 Ncm）、0.5毫米组织嵌顿组（7.83 ± 2.4 Ncm）和1.0毫米组织嵌顿组（2.29 ± 1.4 Ncm）的平均反向扭矩值不同。内部连接组之间发现了一些统计学上的显著差异（p < 0.05）。在所有标本中，48小时后组织未完全溶解。
外部连接种植体受组织嵌顿的影响显著；组织越厚，记录的反向扭矩值越低。内部连接种植体受组织嵌顿的影响较小。
