Universidade Federal do Rio de Janeiro, Faculdade de Odontologia, Departamento de Ortodontia e Odontopediatria (Rio de Janeiro/RJ, Brazil).
Universidade de São Paulo, Faculdade de Odontologia de Ribeirão Preto (Ribeirão Preto/SP, Brazil).
Dental Press J Orthod. 2022 Sep 5;27(4):e2220365. doi: 10.1590/2177-6709.27.4.e2220365.oar. eCollection 2022.
The objective of this study was to evaluate the effect of cigarette smoke (CS) on physical and mechanical properties of ceramic, polycarbonate and alumina ceramic brackets. The null hypothesis tested was that aesthetic brackets would not be influenced by CS.
Ninety aesthetic brackets were allocated to three groups (n = 30): ceramic (GCE), polycarbonate (GCO) and alumina ceramic (GPS). Ten samples of each group were assigned to color and surface roughness analysis, performed before (T0) and after (T1) exposure to CS; and twenty samples were allocated into control and experimental groups (n = 10) (not exposed and exposed to CS, respectively) for shear bond strength test (SBS). Exposure to CS followed an adaptation of the method described by Le Mesurier. Colorimetric reading, surface morphology and roughness, SBS and adhesive remnant index (ARI) were assessed. Statistical analysis comprised independent and paired t-tests, ANOVA/Tukey and Fisher's exact tests (α = 0.05).
Changes were observed in brackets' color (NBS: GCE = 2.4; GCO = 1.9; GPS = 2.1), surface roughness (ΔRa: GCE = 1.1 ± 0.8 µm; GCO = 1.9 ± 1.5µm; GPS = -0.3 ± 0.1 µm / ΔRz: GCE = 1.4 ± 1.0 nm; GPS = -0.5 ± 0.1 nm); and SBS (GPS - experimental = 221.8 ± 48.6 N) after exposure to CS (p< 0.05).
Exposure, in vitro, of aesthetic brackets to CS resulted in changes of color to darker and more opaque shades, surface roughness alterations, and higher SBS values. ARI scores were not associated with exposure to CS.
本研究旨在评估香烟烟雾（CS）对陶瓷、聚碳酸酯和氧化铝陶瓷托槽的物理和机械性能的影响。检验的零假设是 CS 不会影响美观托槽。
将 90 个美学托槽分为三组（n = 30）：陶瓷（GCE）、聚碳酸酯（GCO）和氧化铝陶瓷（GPS）。每组的 10 个样本用于颜色和表面粗糙度分析，在暴露于 CS 之前（T0）和之后（T1）进行；20 个样本分配到对照组和实验组（n = 10）（分别为未暴露和暴露于 CS）进行剪切粘结强度测试（SBS）。CS 的暴露遵循 Le Mesurier 描述的方法的改编。评估颜色比色读数、表面形貌和粗糙度、SBS 和残留粘结指数（ARI）。统计分析包括独立和配对 t 检验、方差分析/Tukey 和 Fisher 精确检验（α = 0.05）。
托槽颜色发生变化（NBS：GCE = 2.4；GCO = 1.9；GPS = 2.1），表面粗糙度（ΔRa：GCE = 1.1 ± 0.8 µm；GCO = 1.9 ± 1.5 µm；GPS = -0.3 ± 0.1 µm/ΔRz：GCE = 1.4 ± 1.0 nm；GPS = -0.5 ± 0.1 nm），SBS（GPS-实验组= 221.8 ± 48.6 N）暴露于 CS 后（p<0.05）。
体外暴露于 CS 会导致美观托槽的颜色变暗和更不透明，表面粗糙度发生变化，SBS 值增加。ARI 评分与 CS 暴露无关。
