Comparing the effect of two polishing systems on surface roughness of feldspathic, lithium disilicate, and translucent zirconia ceramics after orthodontic bracket debonding: An in vitro study

IF 1.8 Q2 DENTISTRY, ORAL SURGERY & MEDICINE

International Orthodontics Pub Date : 2024-09-26 DOI:10.1016/j.ortho.2024.100923

Mohammad Amin Fahimi , Saeed Azarbayejani , Mahshid Mohammadi-Bassir

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Abstract

Introduction

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.

Materials and methods

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).

Results

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.

Conclusions

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.

Limitations

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).

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比较两种抛光系统对正畸托槽脱粘后长石、二硅酸锂和半透明氧化锆陶瓷表面粗糙度的影响：体外研究

导言：陶瓷修复体上的正畸托槽脱粘后会留下粗糙的表面，应该对其进行有效抛光。本研究评估了两种金刚石抛光系统（DPS），即 Optra Fine® (OF) 和 Diapol Twist® (DT)，在托槽脱粘后对长石（F）、二硅酸锂（LD）和半透明氧化锆（TZ）陶瓷表面粗糙度（SR）的影响。3 种陶瓷的 10 个上釉试样作为对照（C）组（n = 30）。其他 60 个试样经过脱釉处理，并根据陶瓷类型进行特定的表面处理后，粘接上中切牙托架。剥离后，用碳化钨毛刺去除剩余的复合粘合剂，然后将试样随机分为 6 组。这九个实验组分别是上釉 F 试样（C）、用 DT 抛光的脱釉 F 试样、用 OF 抛光的脱釉 F 试样、上釉 LD 试样（C）、用 DT 抛光的脱釉 LD 试样、用 OF 抛光的脱釉 LD 试样、上釉 TZ 试样（C）、用 DT 抛光的脱釉 TZ 试样、用 OF 抛光的脱釉 TZ 试样。通过轮廓仪（Ra 和 Rz 参数）对 SR 进行定量评估，通过扫描电子显微镜（SEM）对 SR 进行定性评估。定量数据采用 Kolmogorov-Smirnov 检验、双向方差分析和 Tukey 事后检验（α = 0.05）进行统计分析。抛光组和施釉组的 Ra 没有明显差异（P > 0.05）。结论无论陶瓷类型如何，两种金刚石抛光系统都能有效降低表面粗糙度。本研究只调查了每种陶瓷类型的一个品牌。本研究获得了伦理审查委员会（IR.IAU.KHUISF.REC.1401.156）的批准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Orthodontics DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

2.50

自引率

13.30%

发文量

审稿时长

26 days

期刊介绍： Une revue de référence dans le domaine de orthodontie et des disciplines frontières Your reference in dentofacial orthopedics International Orthodontics adresse aux orthodontistes, aux dentistes, aux stomatologistes, aux chirurgiens maxillo-faciaux et aux plasticiens de la face, ainsi quà leurs assistant(e)s. International Orthodontics is addressed to orthodontists, dentists, stomatologists, maxillofacial surgeons and facial plastic surgeons, as well as their assistants.