Dimensional Stability and Retention Strength of Impressions to Custom Impression Trays Fabricated Using Conventional Method and Additive Technology - An In-vitro Study.

Q3 Dentistry Indian Journal of Dental Research Pub Date : 2023-10-01 Epub Date: 2023-12-27 DOI:10.4103/ijdr.ijdr_519_23
K Sangeetha Priyadarshini, V Vidyashree Nandini, Russia Marimuthu, Jailance Lathief
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Abstract

Background: 3D printing technology is replacing manual fabrication in all fields. 3D-printed impression trays should be assessed as they could replace conventional impression trays in the future.

Aim: In-vitro comparison and evaluation of the dimensional stability and retention strength of impressions to custom impression trays fabricated using conventional method and additive technology.

Materials and methods: A maxillary edentulous auto-polymerizing acrylic resin model served as the master model. Two moulds were prepared from the master model in order to obtain 12 casts. One cast was scanned for 3D printing digital light processing (DLP) and fused deposition modelling (FDM) 24 impression trays using polylactic acid (PLA). Twelve casts were used to fabricate light cure impression trays. Polyvinyl-siloxane impressions were made on the master model using 36 impression trays and 18 trays each were used to assess dimensional stability and retention strength.

Results: In dimensional stability analysis, one sample t-test revealed a statistically significant difference between each group and the master model followed by a one-way ANOVA. There were significant differences, but the difference was less with FDM trays (P < 0.05). In retention strength analysis, one-way Analysis of variance (ANOVA) revealed statistically significant difference between each group and post-hoc test revealed specific difference, the highest with FDM trays (P < 0.05).

Conclusion: Dimensional changes were observed at 30 minutes and 72 hours. Lesser dimensional changes were observed when impressions were made using FDM trays followed by DLP and light cure trays. The mean retention strength seen in descending order was FDM, followed by DLP and light cure trays. The best retention strength was noticed when impressions were made using FDM trays.

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使用传统方法和添加剂技术制作的定制印模托盘印模的尺寸稳定性和保持强度 - 体外研究。
背景:三维打印技术正在各个领域取代手工制造。目的:在体外比较和评估使用传统方法和增材制造技术制作的定制印模托盘的印模尺寸稳定性和保持强度:上颌无牙自动聚合丙烯酸树脂模型作为主模型。根据主模型制备两个模具,以获得 12 个铸模。扫描一个铸模,使用聚乳酸(PLA)进行三维打印数字光处理(DLP)和熔融沉积建模(FDM),以获得 24 个印模托盘。12 个铸模用于制作光固化印模托盘。使用 36 个印模托盘在主模型上制作聚乙烯硅氧烷印模,并分别使用 18 个印模托盘评估尺寸稳定性和保持力:在尺寸稳定性分析中,单样本 t 检验显示各组与主模型之间存在显著的统计学差异,然后进行单因素方差分析。各组之间存在明显差异,但 FDM 托盘的差异较小(P < 0.05)。在保留强度分析中,单因素方差分析(ANOVA)显示各组之间存在统计学意义上的显著差异,事后检验显示存在特定差异,其中 FDM 托盘的差异最大(P < 0.05):观察到 30 分钟和 72 小时后的尺寸变化。使用 FDM 托盘制模时,尺寸变化较小,其次是 DLP 和光固化托盘。平均保持力从高到低依次是 FDM,其次是 DLP 和光固化托盘。使用 FDM 托盘制作的印模具有最佳的保持力。
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来源期刊
Indian Journal of Dental Research
Indian Journal of Dental Research Dentistry-Dentistry (all)
CiteScore
1.80
自引率
0.00%
发文量
80
审稿时长
38 weeks
期刊介绍: Indian Journal of Dental Research (IJDR) is the official publication of the Indian Society for Dental Research (ISDR), India section of the International Association for Dental Research (IADR), published quarterly. IJDR publishes scientific papers on well designed and controlled original research involving orodental sciences. Papers may also include reports on unusual and interesting case presentations and invited review papers on significant topics.
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