氧化锆增强玻璃离子修复体在臼齿低矿化中的应力分布：有限元分析。

IF 4.6 1区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Dental Materials Pub Date : 2025-03-29 DOI:10.1016/j.dental.2025.03.007

Reham A. Mahfouz , Amina M. Abd El Rahman , Azza G. Hanno , M. Helmi Attia

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引用次数: 0

摘要

目的：应用有限元分析方法研究氧化锆增强玻璃离子水门合剂（GIC）修复低矿化恒磨牙（HPFMs）在动态咬合载荷作用下的应力分布。方法：对1例8岁儿童的HPFM进行CBCT和口腔内扫描。使用3D-CAD软件“MIMICS 21.0”构建三个模型。模型1为健全的PFM，模型2为HPFM，模型3为氧化锆增强GIC （Zirconomer®）修复的HPFM。模拟一个理想的动态咬合加载周期（持续时间0.25 s），包括阶段1和阶段2，以最大间歇点（PoMI）分隔。最大和平均荷载分别为321和168 N。采用Abaqus-FEA软件记录装配体(A)和模型各组成部分：正常牙釉质(E)、低矿化牙釉质（HE）、修复区（RA）和牙本质(D)中的Von Mises （vM）和Maximum Principal （Pmax）应力。结果：在0.18 s时获得最大vM和Pmax应力。在所有模型中，牙釉质都是承受应力的成分。模型II显示E和HE之间的应力高度集中。模型II的应力最大，模型III的应力最小。结论：氧化锆增强GIC修复HPFM获得良好的应力分布。在正常和低矿化牙釉质交界处发现的高应力浓度，以及HE的不良物理特性，可能导致hpfm常见的爆发后牙釉质破裂（PEB）。临床意义：玻璃离子水门体作为磨牙低矿化的临时修复体，需要较强的物理性能和咬合力的分布。本研究表明，氧化锆增强GIC是一种可接受的hpfm修复材料。

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Stress distribution in zirconia-reinforced glass ionomer restorations in molar incisor hypomineralization: A finite element analysis

Objective

Investigating stress distribution in zirconia-reinforced glass ionomer cement (GIC), used to restore hypomineralized permanent first molars (HPFMs), under dynamic occlusal loading, using Finite Element Analysis (FEA).

Methods

CBCT and intra-oral scans of HPFM of an 8-year-old child were obtained. Three models were constructed using 3D-CAD software ‘MIMICS 21.0’. Model I represented a sound PFM, Model II: HPFM, and Model III: HPFM restored with zirconia-reinforced GIC (Zirconomer®). An idealized dynamic occlusal loading cycle (duration 0.25 s) was simulated consisting of Phases I and II, separated by point of Maximum Intercuspation (PoMI). The maximum and mean loads were 321 and 168 N, respectively. Abaqus-FEA software was used to record Von Mises (vM), and Maximum Principal (Pmax) stresses in the assembly (A), and in the models’ components: normal enamel (E), hypomineralized enamel (HE), restorative area (RA), and dentine (D).

Results

Maximum vM and P_max stresses were obtained at 0.18 s. Enamel was the stress-bearing component in all models. Model II revealed high stress concentration between E and HE. The highest stresses in the RA were obtained in Model II, and the lowest in Model III.

Conclusions

Favorable stress distributions were obtained in HPFM restored with zirconia-reinforced GIC. The high stress concentrations found at the junction between normal and hypomineralized enamel, and the poor physical properties of HE, may lead to post-eruptive enamel breakdown (PEB) common in HPFMs.

Clinical significance

Glass ionomer cements placed as interim restorations in molar incisor hypomineralization require strong physical properties and distribution of occlusal forces. This study shows that zirconia-reinforced GIC is an acceptable restoration in HPFMs.

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来源期刊

Dental Materials 工程技术-材料科学：生物材料

CiteScore

9.80

自引率

10.00%

发文量

290

审稿时长

67 days

期刊介绍： Dental Materials publishes original research, review articles, and short communications. Academy of Dental Materials members click here to register for free access to Dental Materials online. The principal aim of Dental Materials is to promote rapid communication of scientific information between academia, industry, and the dental practitioner. Original Manuscripts on clinical and laboratory research of basic and applied character which focus on the properties or performance of dental materials or the reaction of host tissues to materials are given priority publication. Other acceptable topics include application technology in clinical dentistry and dental laboratory technology. Comprehensive reviews and editorial commentaries on pertinent subjects will be considered.