Faculdade São Leopoldo Mandic - SLMANDIC, Campinas, São Paulo, Brazil; Department of Pediatric Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba - UNICAMP, São Paulo, Brazil.
Faculdade São Leopoldo Mandic - SLMANDIC, Campinas, São Paulo, Brazil.
Dent Mater. 2020 Mar;36(3):e85-e92. doi: 10.1016/j.dental.2020.01.018. Epub 2020 Feb 1.
The aim of this study was to determine the physico-mechanical properties of a high viscosity glass ionomer cement (GIC) reinforced with TiO nanotubes (TiO-nt).
TiO-nt was incorporated into the GIC powder components (Ketac Molar EasyMix™) in concentrations of 0% (control group), 3%, 5%, 7% by weight. Compressive strength (n = 10/group), three point bending for flexural strength (n = 18/group), microshear bond strength to dentin and failure mode (n = 20/group), and surface roughness and weight loss before and after brushing simulation (30,000 cycles) (n = 8/group) were evaluated. Data were submitted to Shapiro-Wilk, ANOVA, Tukey and Chi-square tests (α ≤ 0.05).
Addition of 5% of TiO-nt into GIC presented the highest values for compressive strength and differed from the control, 3% and 7% groups (p = 0.023). There were no significant differences in flexural strength (p = 0.107) and surface roughness before and after the dental brushing (p = 0.287) among the groups. GIC added with 5% TiO-nt showed the lowest weight loss values (p = 0.01), whereas the control, 3% or 5% TiO-nt groups presented similar microshear bond strength values (p ≥ 0.05). The 5% TiO-nt group featured higher microshear bond strength than the 7% TiO-nt group (p = 0.034). Cohesive in material was the most representative failure mode for all groups.
The incorporation of TiO-nt did not affect GIC's adhesiveness to dentin, but improved its compressive strength at 5%. Furthermore, TiO-nt decreased the percentage of weight loss after GIC's surface wear.
本研究旨在确定经 TiO 纳米管（TiO-nt）增强的高粘度玻璃离子水门汀（GIC）的物理力学性能。
将 TiO-nt 以 0%（对照组）、3%、5%、7%（按重量计）的浓度掺入 GIC 粉成分（Ketac Molar EasyMix™）中。评估抗压强度（n = 10/组）、三点弯曲法测定抗弯强度（n = 18/组）、牙本质微拉伸粘结强度和失效模式（n = 20/组）以及刷模拟前后的表面粗糙度和重量损失（30,000 次循环）（n = 8/组）。数据接受 Shapiro-Wilk、方差分析、Tukey 和卡方检验（α ≤ 0.05）。
GIC 中添加 5%的 TiO-nt 表现出最高的抗压强度，与对照组、3%和 7%组相比存在显著差异（p = 0.023）。各组间抗弯强度（p = 0.107）和刷模拟前后的表面粗糙度无显著差异（p = 0.287）。添加 5% TiO-nt 的 GIC 表现出最低的重量损失值（p = 0.01），而对照组、3%或 5% TiO-nt 组的微拉伸粘结强度值相似（p ≥ 0.05）。5% TiO-nt 组的微拉伸粘结强度高于 7% TiO-nt 组（p = 0.034）。所有组均以材料内聚性为最具代表性的失效模式。
TiO-nt 的掺入不影响 GIC 对牙本质的粘结性，但可提高其在 5%时的抗压强度。此外，TiO-nt 降低了 GIC 表面磨损后重量损失的百分比。
