Soares Luana de Melo, Romano Beatriz de Cássia, André Carolina Bosso, Giannini Marcelo
Dental Materials Division, Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.
Operative Dentistry Division, Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.
Braz Dent J. 2025 Aug 11;36:e236361. doi: 10.1590/0103-644020256361. eCollection 2025.
To investigate the effect of the application of a glycerin gel on the surface of 3D printing resins (3DPRs) samples as a physical barrier, avoiding the inhibition layer formation caused by the presence of atmospheric oxygen during the post-curing process on their physical properties of 3DPRs.
Two 3DPRs were tested: one for "provisional" restorations (Prizma 3D Bio Prov) and another for indirect "permanent" restorations (Prizma 3D Bio Crown). Samples of 3DPRs were printed for flexural strength, elastic modulus, and Knoop microhardness analysis (n = 10). Two post-curing treatments were investigated: a "Control" (without application of a glycerin gel on 3DPRs samples) and an "experimental" that included the glycerin gel application to cover the surfaces of the 3DPRs samples during the post-curing process (10 min). Generalized linear model analysis was applied to evaluate the data, followed by the Bonferroni test (α=0.05).
The glycerin gel application significantly increased the flexural strength (15 - 26%) and elastic modulus (26 - 35%) of 3DPRs (p<0.05). The flexural strength and elastic modulus did not differ between 3DPRs, regardless of the glycerin gel application (p>0.05). The microhardness measured at different internal depths did not vary, regardless of the type of 3DPR and glycerin gel application (p>0.05).
The application of the glycerin gel on the surface of the 3D-printed samples positively impacted the flexural strength and elastic modulus results for both 3DPRs tested, but the glycerin gel application did not influence their internal microhardness.
研究甘油凝胶作为物理屏障应用于3D打印树脂（3DPRs）样品表面，避免后固化过程中大气氧的存在导致抑制层形成对3DPRs物理性能的影响。
测试两种3DPRs：一种用于“临时”修复体（Prizma 3D Bio Prov），另一种用于间接“永久”修复体（Prizma 3D Bio Crown）。打印3DPRs样品用于弯曲强度、弹性模量和努氏显微硬度分析（n = 10）。研究了两种后固化处理：“对照”（3DPRs样品不应用甘油凝胶）和“实验”处理，即在3DPRs样品后固化过程中（10分钟）应用甘油凝胶覆盖其表面。应用广义线性模型分析评估数据，随后进行Bonferroni检验（α = 0.05）。
应用甘油凝胶显著提高了3DPRs的弯曲强度（15 - 26%）和弹性模量（26 - 35%）（p<0.05）。无论是否应用甘油凝胶，3DPRs之间的弯曲强度和弹性模量均无差异（p>0.05）。无论3DPR的类型和是否应用甘油凝胶，在不同内部深度测量的显微硬度均无变化（p>0.05）。
在3D打印样品表面应用甘油凝胶对所测试的两种3DPRs的弯曲强度和弹性模量结果有积极影响，但甘油凝胶的应用对其内部显微硬度没有影响。
