Impact of monomer contamination of isopropanol during post-rinsing on the accuracy of dental models fabricated by vat photopolymerization.

IF 3.4 2区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE
Florian Flierl, Benedikt C Spies, Severin Rothlauf, Kirstin Vach, Ralf J Kohal, Jörg Lüchtenborg
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引用次数: 0

Abstract

Purpose: The aim of this study was to investigate the impact of an increasing level of monomer contamination of isopropanol (isopropyl alcohol [IPA]) during post-rinsing on the dimensional stability of test samples produced by vat photopolymerization. The effect of resin deposits due to insufficient post-rinsing on the accuracy (volume, mean, and maximum deviation) of additive manufacturing workflows was investigated, which has received limited attention in studies on accuracy.

Materials and methods: Forty test specimens (four groups, n = 10) were produced from a commonly used resin for dental model fabrication and underwent post-rinsing in IPA with different levels of monomer contamination (0, 10, 20, and 30 wt%). The dimensional stability was assessed by comparing the optical scan of the produced test specimens with the original digital design. Both the volume of the deposited resin and the effect of different model shapes (inner edges, smooth surfaces, and outer edges) on deposition were investigated. Statistical evaluation was performed using the Kruskal-Wallis test and Dunn's test for pairwise comparisons with Holm correction. To simulate clinical conditions, 20 dental models (four groups, n = 5) were produced, post-processed, and examined using a scanning method.

Results: No significant deviations in specimen dimensions occurred when the monomer contamination was 0%-10%. In the range of 10%-20% contamination, a few significant deviations occurred in the area of sharp inner edges, "inside structures" and small structures (diameter <1000 µm). At contamination levels of 30%, significant deviations were observed eventually in all measured areas.

Conclusions: This study showed that, contrary to the manufacturer's specifications, the IPA should only be replaced during post-rinsing if the monomer contamination of the rinsing solution is >20%. At contamination levels of 10%-20%, post-rinsing of components with large smooth surfaces without sharp edges (e.g., custom trays) is possible without significant deformation. Only for components with very small, sharp-edged, or inverted structures is it advisable to replace the IPA from a contamination level of 10%.

冲洗后异丙醇单体污染对还原光聚合牙模型精度的影响。
目的:本研究的目的是研究洗涤后异丙醇(异丙醇[IPA])单体污染水平增加对大桶光聚合生产的测试样品尺寸稳定性的影响。研究了由于后冲洗不足导致的树脂沉积对增材制造工作流程精度(体积、平均值和最大偏差)的影响,这在精度研究中受到的关注有限。材料和方法:用一种常用的牙科模型制作树脂制作40个试验标本(四组,n = 10),并在不同单体污染水平(0、10、20和30 wt%)的IPA中进行冲洗。尺寸稳定性是通过比较光学扫描生产的测试样品与原始数字设计。研究了沉积树脂的体积和不同模型形状(内缘、光滑表面和外缘)对沉积的影响。采用Kruskal-Wallis检验和Dunn检验进行两两比较,并采用Holm校正。为模拟临床情况,制作牙体模型20个(4组,n = 5),进行后处理和扫描检查。结果:当单体污染为0% ~ 10%时,样品尺寸无明显偏差。在10%-20%的污染范围内,尖锐的内缘、“内部结构”和小结构(直径)区域出现了一些明显的偏差。结论:本研究表明,与制造商的规范相反,只有当冲洗液的单体污染为> -20%时,才应该在冲洗后更换IPA。在10%-20%的污染水平下,可以对表面光滑但边缘不锋利的部件(例如,定制托盘)进行后冲洗,而不会产生明显的变形。只有对于非常小、边缘锋利或结构倒置的部件,建议在污染水平为10%时更换IPA。
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
CiteScore
7.90
自引率
15.00%
发文量
171
审稿时长
6-12 weeks
期刊介绍: The Journal of Prosthodontics promotes the advanced study and practice of prosthodontics, implant, esthetic, and reconstructive dentistry. It is the official journal of the American College of Prosthodontists, the American Dental Association-recognized voice of the Specialty of Prosthodontics. The journal publishes evidence-based original scientific articles presenting information that is relevant and useful to prosthodontists. Additionally, it publishes reports of innovative techniques, new instructional methodologies, and instructive clinical reports with an interdisciplinary flair. The journal is particularly focused on promoting the study and use of cutting-edge technology and positioning prosthodontists as the early-adopters of new technology in the dental community.
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