Waly Ahmed S, Souror Yasser R, Yousief Salah A, Alqahtani Waleed M S, El-Anwar Mohamed I
Department of Pediatric Dentistry and Dental Public Heath, Faculty of Dental Medicine, Al-Azhar University Assuit Branch, Egypt.
Department of Restorative Dental Sciences, Alfarabi Colleges for Dentistry and Nursing, Jeddah, Saudi Arabia.
Eur J Dent. 2021 Feb;15(1):77-83. doi: 10.1055/s-0040-1715915. Epub 2020 Oct 1.
To study the effect of using different cement types under pediatric stainless-steel crown (SSC) around mandibular second primary molar using three-dimensional (3D) finite element analysis.
A 3D finite element model was built for pediatric mandibular molar by laser scanning of natural extracted tooth. Four types of cement (zinc phosphate, glass ionomer, resin-modified glass ionomer, and resin) of 200 μm layers thickness were tested under a stainless-steel crown of 130-μm thickness. Twelve case studies were reported within this research, as the applied load of 330 N was tested with three angulations: vertical, oblique at 45°, and laterally.
Linear static stress analysis was performed. The resultant stresses and deformations' distribution patterns did not change with cement type, while the values were altered. All deformations and stresses were found within the normal range.
Analysis results indicated that using stiffer cement material increases tooth structure stresses and reduces crown body stresses and deformations, while bone was nearly insensitive to cement type.
采用三维有限元分析方法，研究下颌第二乳磨牙周围儿童不锈钢冠（SSC）使用不同类型粘结剂的效果。
通过对天然拔除牙进行激光扫描，建立儿童下颌磨牙的三维有限元模型。在厚度为130μm的不锈钢冠下测试了四种厚度为200μm层的粘结剂（磷酸锌、玻璃离子、树脂改性玻璃离子和树脂）。本研究报告了12个案例，施加330N的载荷，并以三种角度进行测试：垂直、45°斜向和侧向。
进行了线性静态应力分析。结果应力和变形的分布模式不随粘结剂类型而变化，但数值有所改变。所有变形和应力均在正常范围内。
分析结果表明，使用硬度更高的粘结剂材料会增加牙齿结构应力，降低冠体应力和变形，而骨组织对粘结剂类型几乎不敏感。
