Department of Orthodontics, Dental School, Isfahan (Khorasgan) Branch, Islamic Azad University, Tehran, Iran.
Department of Operative Dentistry, School of Dentistry, Shahed University, Tehran, Iran.
Int Orthod. 2024 Dec;22(4):100923. doi: 10.1016/j.ortho.2024.100923. Epub 2024 Sep 26.
Debonding of orthodontic brackets on ceramic restorations leave a rough surface which should be efficiently polished. In this study the effect of two diamond polishing systems (DPS), namely Optra Fine® (OF) and Diapol Twist® (DT) on surface roughness (SR) of feldspathic (F), lithium disilicate (LD), and translucent zirconia (TZ) ceramics assessed after bracket debonding.
Ninety disc-shaped specimens fabricated from F, LD, and TZ ceramics and glazed (Gl). Ten glazed specimens of 3 ceramic types served as control (C) groups (n=30). Other 60 specimens were deglazed, and after specific surface preparation according to ceramic type, upper central incisor brackets were bonded. After debonding, the remaining adhesive composite removed with tungsten carbide bur and specimens randomly assigned into 6 groups. The nine experimental groups defined as: Glazed F specimens (C), Deglazed F specimens polished with DT, Deglazed F specimens polished with OF, Glazed LD specimens (C), Deglazed LD specimens polished with DT, Deglazed LD specimens polished with OF, Glazed TZ specimens (C), Deglazed TZ specimens polished with DT, Deglazed TZ specimens polished with OF. The SR assessed quantitatively by profilometry (Ra and Rz parameter) and qualitatively by scanning electron microscopy (SEM). Quantitative data were statistically analysed using Kolmogorov-Smirnov test, two-way ANOVA and Tukey post-hoc test (α=0.05).
No significant difference found in SR of three glazed ceramic types (P=0.293 for Ra and P=0.473 for Rz). There was no significant difference of Ra between polished and glazed groups (P>0.05). However, difference in Rz was significant (P<0.05), and only TZ specimens could reach to the level of smoothness caused by glazing.
Both diamond polishing systems can efficiently reduce the surface roughness, despite of ceramic type. Optra Fine® system showed a superior performance than Diapol Twist® without significant difference.
In this study only one brand of each ceramic type was investigated. This study was approved by Ethical Review Committee (IR.IAU.KHUISF.REC.1401.156).
正畸托槽从陶瓷修复体上脱落后会留下粗糙的表面，需要进行有效的抛光。本研究评估了两种金刚石抛光系统（DPS），即 Optra Fine®（OF）和 Diapol Twist®（DT），对脱落后的长石质（F）、锂二硅、半透明氧化锆陶瓷的表面粗糙度（SR）的影响。
从 F、LD 和 TZ 陶瓷和上釉（Gl）中制作了 90 个圆盘形试件。3 种陶瓷类型的 10 个上釉试件作为对照（C）组（n=30）。其余 60 个试件进行去釉处理，根据陶瓷类型进行特定的表面处理后，在上颌中切牙上粘结托槽。脱落后，用碳化钨车针去除剩余的复合树脂，将试件随机分配到 6 个组中。这 9 个实验组分别定义为：上釉 F 试件（C）、用 DT 抛光的去釉 F 试件、用 OF 抛光的去釉 F 试件、上釉 LD 试件（C）、用 DT 抛光的去釉 LD 试件、用 OF 抛光的去釉 LD 试件、上釉 TZ 试件（C）、用 DT 抛光的去釉 TZ 试件、用 OF 抛光的去釉 TZ 试件。用轮廓仪（Ra 和 Rz 参数）定量评估 SR，用扫描电子显微镜（SEM）定性评估 SR。使用 Kolmogorov-Smirnov 检验、双因素方差分析和 Tukey 事后检验（α=0.05）对定量数据进行统计学分析。
三种上釉陶瓷类型的 SR 无显著差异（Ra 为 P=0.293，Rz 为 P=0.473）。抛光组与上釉组的 Ra 无显著差异（P>0.05）。然而，Rz 差异显著（P<0.05），只有 TZ 试件才能达到上釉引起的光滑程度。
两种金刚石抛光系统都能有效地降低表面粗糙度，与陶瓷类型无关。Optra Fine®系统的性能优于 Diapol Twist®，但无显著差异。
本研究仅调查了每种陶瓷类型的一个品牌。本研究经伦理审查委员会批准（IR.IAU.KHUISF.REC.1401.156）。
