Effect of artificial aging on mechanical and physical properties of CAD-CAM PMMA resins for occlusal splints.

IF 2.7 3区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Advanced Prosthodontics Pub Date : 2023-10-01 Epub Date: 2023-10-26 DOI:10.4047/jap.2023.15.5.227

Júlia Correa Raffaini, Eduardo Jose Soares, Rebeca Franco de Lima Oliveira, Rocio Geng Vivanco, Ayodele Alves Amorim, Ana Lucia Caetano Pereira, Fernanda Carvalho Panzeri Pires-de-Souza

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引用次数: 0

Abstract

Purpose: This study aimed to assess and compare the color stability, flexural strength (FS), and surface roughness of occlusal splints fabricated from heat-cured acrylic resin, milled polymethyl methacrylate (PMMA)-based resin, and 3D-printed (PMMA) based-resin.

Materials and methods: Samples of each type of resin were obtained, and baseline measurements of color and surface roughness were recorded. The specimens were divided into three groups (n = 10) and subjected to distinct aging protocols: thermomechanical cycling (TMC), simulated brushing (SB), and control (without aging). Final assessments of color and surface roughness and three-point bending test (ODM100; Odeme) were conducted, and data were statistically analyzed (2-way ANOVA, Tukey, P <.05).

Results: Across all resin types, the most significant increase in surface roughness (Ra) was observed after TMC (P < .05), with the 3D-printed resin exhibiting the lowest Ra (P < .05). After brushing, milled resin displayed the highest Ra (P < .05) and greater color alteration (ΔE₀₀) compared to 3D-printed resin. The most substantial ΔE₀₀ was recorded after brushing for all resins, except for heat-cured resin subjected to TMC. Regardless of aging, milled resin exhibited the highest FS (P < .05), except when compared to 3D-printed resin subjected to TMC. Heat-cured resin exposed to TMC demonstrated the lowest FS, different (P < .05) from the control. Under control conditions, milled resin exhibited the highest FS, different (P < .05) from the brushed group. 3D-printed resin subjected to TMC displayed the highest FS (P < .05).

Conclusion: Among the tested resins, 3D-printed resin demonstrated superior longevity, characterized by minimal surface roughness and color alterations. Aging had a negligible impact on its mechanical properties.

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人工老化对牙合夹板用CAD-CAM-PMMA树脂力学和物理性能的影响。

目的：本研究旨在评估和比较由热固化丙烯酸树脂、研磨聚甲基丙烯酸甲酯基树脂和3D打印（PMMA）基树脂制成的咬合夹板的颜色稳定性、弯曲强度（FS）和表面粗糙度。材料和方法：获得每种树脂的样品，并记录颜色和表面粗糙度的基线测量。将样本分为三组（n=10），并进行不同的老化方案：热机械循环（TMC）、模拟刷牙（SB）和对照（无老化）。进行颜色和表面粗糙度的最终评估以及三点弯曲试验（ODM100；Odeme），并对数据进行统计分析（双向方差分析，Tukey，P结果：在所有树脂类型中，TMC后观察到表面粗糙度（Ra）的最显著增加（P＜0.05），3D打印树脂显示出最低的Ra（P＜.05），与3D打印树脂相比，研磨树脂显示出最高的Ra（P<.05）和更大的颜色变化（ΔE00）。除经过TMC的热固化树脂外，所有树脂在刷涂后均记录到最显著的ΔE00。无论老化如何，研磨树脂都表现出最高的FS（P<.05），除非与经受TMC的3D打印树脂相比。暴露于TMC的热固化树脂表现出最低的FS，与对照组不同（P<.05）。在对照条件下，研磨树脂表现出最高的FS，与拉丝组不同（P<.05）。经过TMC处理的3D打印树脂显示出最高的FS（P<.05）。结论：在测试的树脂中，3D打印树脂表现出优异的寿命，其特征是表面粗糙度和颜色变化最小。老化对其机械性能的影响微乎其微。

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来源期刊

Journal of Advanced Prosthodontics DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

4.70

自引率

3.80%

发文量

期刊介绍： This journal aims to convey scientific and clinical progress in the field of prosthodontics and its related areas to many dental communities concerned with esthetic and functional restorations, occlusion, implants, prostheses, and biomaterials related to prosthodontics. This journal publishes • Original research data of high scientific merit in the field of diagnosis, function, esthetics and stomatognathic physiology related to prosthodontic rehabilitation, physiology and mechanics of occlusion, mechanical and biologic aspects of prosthodontic materials including dental implants. • Review articles by experts on controversies and new developments in prosthodontics. • Case reports if they provide or document new fundamental knowledge.