Comparative analysis of polishing protocols on microhardness and surface roughness of occlusal device materials fabricated using microwave-polymerized acrylic or 3D printed resins.

IF 4.3 2区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Journal of Prosthetic Dentistry Pub Date : 2024-11-01 DOI:10.1016/j.prosdent.2024.10.010
Thiago Carvalho de Sousa, Alexia Guimarães Ramos, Fernanda Cristina Pimentel Garcia, Rodrigo Antonio de Medeiros
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Abstract

Statement of problem: With advancements in digital technologies, the digital workflow has revolutionized the fabrication of occlusal devices through additive methods using 3-dimensional (3D) printing. However, an established protocol for polishing 3D printed occlusal devices is lacking, despite this step being crucial for minimizing surface porosity, material fatigue and preventing bacterial plaque accumulation, thereby contributing to device longevity.

Purpose: The purpose of this in vitro study was to evaluate the impact of polishing systems on the surface roughness and Vickers microhardness of heat-polymerizing acrylic resin and 3D printing resins used for occlusal devices.

Material and methods: One hundred and twenty microwaved-polymerized acrylic resin and 3D printed resin specimens (40×40×3 mm) were divided into 12 groups (n=10) based on the type of resin and polishing protocol (Sealant, DhPro, Dhpro + Sealant, Trihawk, Trihawk + Sealant, and control). Surface roughness (Ra) and Vickers microhardness were tested. Additionally, 1 specimen per group underwent scanning electron microscopy before and after thermocycling (5000 cycles, 5 ºC and 55 ºC). Data analysis involved a 2-way ANOVA, 2-way repeated measured ANOVA, and Tukey's multiple comparison test (α=.05).

Results: The Trihawk polishing protocol yielded significantly higher microhardness and lower surface roughness values for both resins. After thermocycling, the acrylic resin maintained its surface roughness for the Trihawk, Trihawk + Sealant, and unpolished groups, but all groups showed decreased microhardness. The 3D printing resin exhibited increased surface roughness and reduced microhardness after thermocycling across all groups.

Conclusions: The polishing protocol affects the surface microhardness and roughness of 3D printing resins and microwave acrylic resins for occlusal devices. Polishing using the Trihawk polishing protocol demonstrated significantly smoother and harder surfaces for both resins tested.

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对使用微波聚合丙烯酸树脂或三维打印树脂制造的咬合装置材料的微硬度和表面粗糙度的抛光方案进行比较分析。
问题陈述:随着数字技术的进步,通过使用三维(3D)打印的添加方法,数字工作流程彻底改变了咬合装置的制造。目的:本体外研究的目的是评估抛光系统对用于咬合装置的热聚合丙烯酸树脂和 3D 打印树脂的表面粗糙度和维氏硬度的影响:根据树脂类型和抛光方案(Sealant、DhPro、Dhpro + Sealant、Trihawk、Trihawk + Sealant和对照组)将120个微波聚合丙烯酸树脂和3D打印树脂试样(40×40×3 mm)分为12组(n=10)。对表面粗糙度(Ra)和维氏显微硬度进行了测试。此外,在热循环(5000 次,5 ºC 和 55 ºC)前后,每组各对一个试样进行扫描电子显微镜检查。数据分析包括双向方差分析、双向重复测量方差分析和 Tukey 多重比较检验(α=.05):Trihawk 抛光方案使两种树脂的显微硬度值明显提高,表面粗糙度值明显降低。热循环后,丙烯酸树脂的 Trihawk 组、Trihawk + 密封剂组和未抛光组都保持了其表面粗糙度,但所有组的显微硬度都有所下降。三维打印树脂在热循环后,所有组的表面粗糙度都有所增加,显微硬度都有所降低:抛光方案会影响用于咬合装置的 3D 打印树脂和微波丙烯酸树脂的表面显微硬度和粗糙度。使用 Trihawk 抛光方案进行抛光后,两种受测树脂的表面都明显更光滑、更坚硬。
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来源期刊
Journal of Prosthetic Dentistry
Journal of Prosthetic Dentistry 医学-牙科与口腔外科
CiteScore
7.00
自引率
13.00%
发文量
599
审稿时长
69 days
期刊介绍: The Journal of Prosthetic Dentistry is the leading professional journal devoted exclusively to prosthetic and restorative dentistry. The Journal is the official publication for 24 leading U.S. international prosthodontic organizations. The monthly publication features timely, original peer-reviewed articles on the newest techniques, dental materials, and research findings. The Journal serves prosthodontists and dentists in advanced practice, and features color photos that illustrate many step-by-step procedures. The Journal of Prosthetic Dentistry is included in Index Medicus and CINAHL.
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