Effect of different lengths of post-curing UV light exposure on the mechanical properties of 3D-printed aligners: An in vitro study.

IF 1.8 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Orthodontics Pub Date : 2025-12-01 Epub Date: 2025-11-04 DOI:10.1177/14653125251389980

Roohi Sobti, Anup Kanase, Vaibhav Misra

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引用次数: 0

Abstract

Objective: To investigate the effect of different durations of post-curing ultraviolet (UV) light exposure on the compressive strength, amount of displacement and water absorbed by direct-printed aligners.

Design: An in-vitro randomised control trial.

Setting: Orthodontics laboratory in Maulana Azad Institute of Dental Sciences, New Delhi, India.

Methods: Dental LT V2 resin was used to print 30 aligners, which were divided into three groups and subjected to different post-print UV light exposures. Each group was subjected to compression loading of 1000 N to evaluate their load vs. displacement behaviour. The amount of water absorbed by aligners in each group was also evaluated. Data were analysed using one-way analysis of variance (ANOVA) and repeated measures ANOVA.

Results: The '60-min cure' group bore the maximum mean compressive load (1016.03 ± 37.27 N) and had the least mean displacement (2.87 ± 0.52 mm) and water absorption (0.18 g).The '40-min cure' group did not show significant results for any of the tests carried out.

Conclusion: Aligners subjected to 60 min of post-print UV light exposure were the most rigid and had highest compressive strength. Increasing the duration of post-UV light curing reduced the amount of water absorbed by the aligners. Since the '60-min cure' group was excessively rigid, a post-curing duration of 40 min is recommended to provide sufficient flexibility for comfortable daily use and wear.

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不同固化后紫外光照射长度对3d打印对准器机械性能的影响：体外研究。

目的：探讨不同固化后紫外光照射时间对直印矫形器抗压强度、位移量和吸水性的影响。设计：体外随机对照试验。地点：印度新德里Maulana Azad牙科科学研究所正畸实验室。方法：采用牙科LT V2树脂打印30个牙齿矫正器，将其分为三组，分别进行不同的打印后紫外光照射。每组均承受1000 N的压缩载荷，以评估其载荷与位移行为。对各组矫形器的吸水量也进行了评价。数据分析采用单因素方差分析（ANOVA）和重复测量方差分析（ANOVA）。结果：60 min固化组承受的平均压缩载荷最大（1016.03±37.27 N），平均位移最小（2.87±0.52 mm），吸水率最小（0.18 g）。“40分钟治愈”组在进行的任何测试中都没有显示出显著的结果。结论：打印后经紫外光照射60 min的矫正器硬度最高，抗压强度最高。增加紫外光固化后的持续时间减少了校准器吸收的水量。由于“60分钟固化”组过于刚性，建议固化后持续时间为40分钟，以提供足够的灵活性，以舒适的日常使用和佩戴。

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

Journal of Orthodontics DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

2.60

自引率

15.40%

发文量

期刊介绍： The Journal of Orthodontics has an international circulation, publishing papers from throughout the world. The official journal of the British Orthodontic Society, it aims to publish high quality, evidence-based, clinically orientated or clinically relevant original research papers that will underpin evidence based orthodontic care. It particularly welcomes reports on prospective research into different treatment methods and techniques but also systematic reviews, meta-analyses and studies which will stimulate interest in new developments. Regular features include original papers on clinically relevant topics, clinical case reports, reviews of the orthodontic literature, editorials, book reviews, correspondence and other features of interest to the orthodontic community. The Journal is published in full colour throughout.