Conservative Dentistry and Endodontics, Army Dental Centre, Research and Referral, Delhi, India, Phone: +91 9717888513, e-mail:
General Dental Services, IHQ of MOD (Army), Delhi, India.
J Contemp Dent Pract. 2020 Sep 1;21(9):961-969.
To compare the stress distribution of four modalities of reinforcing the radicular space of a pulpless central incisor exhibiting stage 4 root development.
The model of a pulpless immature central incisor with a stage 4 of root development supporting periodontium was generated based on the properties. The longitudinal growth of the root was completed. Four such models were developed. Then, the radicular space was rehabilitated as follows: Model 1: Ceramicrete; Model 2: Biomimetic Mineralization; Model 3: Biodentine; Model 4: Bioaggregate. They were subjected to three different loading conditions. One was to mimic the mastication by applying a load of 70 N applied at 45° angle. Second loading condition was a vertical load of 100 N to mimic bruxism. The third loading condition was to mirror the impact of a frontal trauma. A load of 100 N was applied labially.
It was observed that during mastication, Model 2 has exhibited the lowest concentration of von Mises stresses, followed by Model 3 and then Model 4 followed by Model 1; this could be because the modulus of elasticity of Model 2 is comparable to that of Dentin. During bruxism and horizontal impact, the maximal stress concentration was found in Model 4, Model 3, Model 2, followed by Model 1.
The closer the elasticity of modulus of the primary endodontic replacement monoblock was to that of dentin, the lower were the stresses generated. However, as the increase in stress values was minimal between groups, these obturating materials can be viable reinforcement materials for the rehabilitation of cases of stage 4 developing root. Biomimetic mineralization strategies can be a viable treatment option for managing cases of the open apex.
Biomimetic mineralization strategies and bioceramics can be used for obturation of root canals with open apex, instead of utilizing these bioceramics as apical plugs.
比较四种加强牙髓腔的模式在展示 4 期根发育的无牙髓中央切牙中的应力分布。
基于特性生成具有 4 期根发育牙周支持的无牙髓未成熟中央切牙模型。完成了根的纵向生长。制作了四个这样的模型。然后，对根管空间进行如下修复：模型 1：Ceramicrete；模型 2：仿生矿化；模型 3：Biodentine；模型 4：Bioaggregate。它们经受了三种不同的加载条件。一种是通过以 45°角施加 70N 的载荷来模拟咀嚼。第二种加载条件是施加 100N 的垂直载荷来模拟磨牙症。第三种加载条件是模拟正面创伤的冲击。向唇侧施加 100N 的载荷。
观察到在咀嚼过程中，模型 2 表现出最低的 von Mises 应力浓度，其次是模型 3，然后是模型 4，最后是模型 1；这可能是因为模型 2 的弹性模量与牙本质相当。在磨牙症和水平冲击时，模型 4 中的最大应力集中最大，其次是模型 3、模型 2 和模型 1。
初级牙髓替代单体的弹性模量越接近牙本质，产生的应力越低。然而，由于各组之间的应力值增加最小，这些封闭材料可以作为 4 期发育根修复的可行增强材料。仿生矿化策略可以是管理开髓病例的可行治疗选择。
仿生矿化策略和生物陶瓷可用于填充有开髓的根管，而不是将这些生物陶瓷用作根尖塞。
