K. Dalaie, Katayoun Talebi Rafsanjan, Hanieh Nojehdehian, Zahra Namazi
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Data were analyzed by one-sample, paired and independent t-tests, and Mann–Whitney U and Wilcoxon signed-rank tests (alpha = 0.05).\n\n\n\nThe XRD and ATR-FTIR spectra of Erkodur and Shinseki aligners matched those of polyethylene terephthalate glycol polymer and did not change after thermoforming or intraoral exposure. Unlike intraoral exposure (P > 0.05), thermoforming significantly decreased the hardness of both brands of aligners (P < 0.05). Intraoral exposure significantly decreased the thickness of Erkodur aligners at some points and significantly increased the thickness of Shinseki aligners (P < 0.05). Thermoforming significantly decreased the Tg of both brands of aligners (P < 0.05). Intraoral exposure significantly decreased the Tg of Erkodur and increased the Tg of Shinseki aligners (P = 0.000).\n\n\n\nErkodur and Shinseki aligners showed high chemical and structural stability after thermoforming and 2 weeks of intraoral exposure. However, thermoforming affected the thermal and physical properties of both brands of aligners. Erkodur aligners had higher dimensional stability than Shinseki aligners.\n","PeriodicalId":42593,"journal":{"name":"APOS Trends in Orthodontics","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Physical and chemical changes of clear aligners after thermoforming and intraoral exposure\",\"authors\":\"K. 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引用次数: 0
摘要
本研究评估了透明矫治器在热成型和口内暴露后的物理和化学变化。这项体内外研究评估了原始板材、热成型板材以及使用两周的Erkodur和Shinseki两种商业品牌的矫治器(每组n=8)。研究人员测量了试样的表面硬度(通过维氏硬度测试)、厚度(通过数字卡尺)和玻璃化转变温度(Tg)(通过差示扫描量热法),并通过 X 射线衍射(XRD)评估了试样的结晶度,还通过衰减全反射-傅立叶变换红外光谱(ATR-FTIR)分析了试样的分子组成。数据分析采用单样本、配对和独立 t 检验,以及 Mann-Whitney U 和 Wilcoxon 符号秩检验(α = 0.05)。Erkodur 和 Shinseki 矫正器的 XRD 和 ATR-FTIR 光谱与聚对苯二甲酸乙二酯聚合物的光谱一致,在热成型或口内暴露后没有变化。与口内暴露不同(P > 0.05),热成型显著降低了两种品牌矫治器的硬度(P < 0.05)。口内暴露明显降低了Erkodur矫治器某些部位的厚度,而明显增加了Shinseki矫治器的厚度(P < 0.05)。热成型明显降低了两种品牌矫正器的Tg(P < 0.05)。经过热成型和2周的口内暴露后,Erkodur和Shinseki矫正器显示出较高的化学和结构稳定性。然而,热成型影响了两种品牌矫治器的热性能和物理性能。埃克多尔矫正器的尺寸稳定性高于新石矫正器。
Physical and chemical changes of clear aligners after thermoforming and intraoral exposure
This study assessed the physical and chemical changes of clear aligners after thermoforming and intraoral exposure.
This ex vivo study evaluated raw sheets, thermoformed sheets, and aligners used for 2 weeks from two commercial brands of Erkodur and Shinseki (n = 8 in each group). The surface hardness (by the Vickers hardness test), thickness (by a digital caliper), and glass transition temperature (Tg) (by differential scanning calorimetry) of the specimens were measured, and they underwent X-ray diffraction (XRD) to assess their degree of crystallinity and attenuated total reflectance-Fourier-transform infrared spectroscopy (ATR-FTIR) for analysis of their molecular composition. Data were analyzed by one-sample, paired and independent t-tests, and Mann–Whitney U and Wilcoxon signed-rank tests (alpha = 0.05).
The XRD and ATR-FTIR spectra of Erkodur and Shinseki aligners matched those of polyethylene terephthalate glycol polymer and did not change after thermoforming or intraoral exposure. Unlike intraoral exposure (P > 0.05), thermoforming significantly decreased the hardness of both brands of aligners (P < 0.05). Intraoral exposure significantly decreased the thickness of Erkodur aligners at some points and significantly increased the thickness of Shinseki aligners (P < 0.05). Thermoforming significantly decreased the Tg of both brands of aligners (P < 0.05). Intraoral exposure significantly decreased the Tg of Erkodur and increased the Tg of Shinseki aligners (P = 0.000).
Erkodur and Shinseki aligners showed high chemical and structural stability after thermoforming and 2 weeks of intraoral exposure. However, thermoforming affected the thermal and physical properties of both brands of aligners. Erkodur aligners had higher dimensional stability than Shinseki aligners.