Polymerization kinetics of 3D-printed orthodontic aligners under different UV post-curing conditions.

IF 4.8 2区 医学 Q1 Dentistry Progress in Orthodontics Pub Date : 2024-10-28 DOI:10.1186/s40510-024-00540-4
Thomas Manoukakis, Alexandros K Nikolaidis, Elisabeth A Koulaouzidou
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Abstract

Background: The purpose of the study was to measure the degree of conversion (DC) of direct-printed aligners (DPA) that were post-cured under ambient and nitrogen atmosphere at specific time intervals and investigate the kinetics of polymerization reaction of this material.

Methods: A total of 48 aligners were produced in 4 printing series by a 3D printer with TC-85DAC resin (Graphy Inc). From each series of printing, 12 aligners were included. The aligners were divided into two groups according to their post-curing conditions. One group was post-cured under ambient air with the presence of oxygen and the other under a nitrogen atmosphere, both using the same UV post-curing unit recommended by the company. The aligners were post-cured at six different time intervals: 1, 2, 3, 5, 10, and 20 min. Each time interval included 8 aligners, with 2 aligners from each series. The DC of the cured aligners was measured by means of attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) through acquisition of the respective spectra for each UV-curing condition. Statistical analysis was performed to compare the results and differences within each atmosphere post-curing protocol, as well as between the different selected atmosphere conditions. Statistical significance level was set at p-value ≤ 0.05.

Results: Pairwise analysis between post-curing protocols showed statistically significant differences only at the first minute of polymerization. Post-curing with nitrogen did not yield statistically significant results across different time intervals. Post-curing in ambient air showed some significant differences on the 1st and 2nd minute of the post-curing process.

Conclusions: Almost complete double bond conversion was observed. Significant differences were observed only during the first minute of polymerization under the nitrogen atmosphere.

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不同紫外线后固化条件下 3D 打印正畸矫治器的聚合动力学。
背景:本研究的目的是测量在环境和氮气气氛下按特定时间间隔后固化的直接打印对准器(DPA)的转化率(DC),并研究这种材料的聚合反应动力学:使用 TC-85DAC 树脂(Graphy Inc)的 3D 打印机分 4 个系列共生产了 48 个对准器。每个打印系列包括 12 个对准器。根据后固化条件,对齐器被分为两组。一组在有氧气的环境空气中进行后固化,另一组在氮气环境中进行后固化,两组均使用公司推荐的相同紫外线后固化装置。对排列器进行了六次不同时间间隔的后固化:1、2、3、5、10 和 20 分钟。每个时间间隔包括 8 个对准器,每个系列 2 个对准器。通过对每种紫外线固化条件下的相应光谱进行衰减全反射傅立叶变换红外光谱(ATR-FTIR)测量固化对准器的直流电。进行统计分析以比较每种气氛固化后规程的结果和差异,以及不同选定气氛条件之间的结果和差异。统计显著性水平设定为 p 值≤0.05:后固化方案之间的配对分析表明,仅在聚合的第一分钟存在显著的统计学差异。用氮气进行后固化在不同的时间间隔内没有统计学意义。在环境空气中进行后固化在后固化过程的第 1 分钟和第 2 分钟出现了一些显著差异:观察到几乎完全的双键转换。在氮气环境下,仅在聚合的第一分钟观察到显著差异。
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来源期刊
Progress in Orthodontics
Progress in Orthodontics Dentistry-Orthodontics
CiteScore
7.30
自引率
4.20%
发文量
45
审稿时长
13 weeks
期刊介绍: Progress in Orthodontics is a fully open access, international journal owned by the Italian Society of Orthodontics and published under the brand SpringerOpen. The Society is currently covering all publication costs so there are no article processing charges for authors. It is a premier journal of international scope that fosters orthodontic research, including both basic research and development of innovative clinical techniques, with an emphasis on the following areas: • Mechanisms to improve orthodontics • Clinical studies and control animal studies • Orthodontics and genetics, genomics • Temporomandibular joint (TMJ) control clinical trials • Efficacy of orthodontic appliances and animal models • Systematic reviews and meta analyses • Mechanisms to speed orthodontic treatment Progress in Orthodontics will consider for publication only meritorious and original contributions. These may be: • Original articles reporting the findings of clinical trials, clinically relevant basic scientific investigations, or novel therapeutic or diagnostic systems • Review articles on current topics • Articles on novel techniques and clinical tools • Articles of contemporary interest
期刊最新文献
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