■使用各种亚结构材料修复的根尖周病变牙齿的生物力学反应,以及牙槽骨的应力映射,还没有被彻底描述。在这种情况下,这项研究的目的是通过有限元分析(FEA),在线性静态载荷条件下,使用不同的牙冠材料修复了根管治疗的上颌右中央切牙的结构应力分布。
■在研究中,使用五个FEA模型来表示健康的牙齿和用不同的亚结构材料修复的牙齿:(A)健康的牙齿,(B)受损的,根管治疗,复合填充牙齿,(C)受损的,纤维张贴,氧化锆基冠,(D)有病变的牙齿,一根纤维柱,和镍铬基础设施皇冠,(E)有病变的牙齿,一根纤维柱,和IPSE-max基础设施皇冠。从2mm颈部到腭表面的切线,以与牙齿长轴成45°的角度施加100N的力。齿子部件上的变形行为和最大等效应力分布,包括每个模型的骨骼结构,是模拟的。
■在模型的应力分布中观察到差异。代表不同基础结构的修复体的模型的最大应力值各不相同,并且在E-max冠模型中获得了最高值(模型E:136.050MPa)。最小应力大小是从B模型中获得的复合材料填充牙齿(80.39MPa);但是,观察到,所有模型中的等效应力对于所有大小不同的组件都显示出相似的分布。在根尖周病变区域,观察到低应力。在所有型号中,牙齿的颈颈颈区域具有密集的等效应力。
■应用于根尖周病变的根管治疗牙齿的不同修复治疗方法会影响牙槽骨中的应力和牙齿的生物力学反应。已观察到牙齿的颈线处的皮质骨中相对较高的应力值朝顶端区域减小。此观察结果可能表明通过降低根尖周病变区域的压力而产生潜在的治愈效果。
■复合树脂修复体可以被认为是修复根管治疗的有病变的牙齿的首选治疗选择。在冠修复中,在生物力学方面,优选氧化锆或金属支撑的假体将是有利的。
UNASSIGNED: The biomechanical response of teeth with periapical lesions that have been restored using various substructure materials, as well as the stress mapping in the alveolar bone, has not been thoroughly described. In this context, the objective of this study is to investigate the structural stress distributions on root canal-treated maxillary right central incisors with lesions restored using different crown materials under linear static loading conditions through finite element analysis (FEA).
UNASSIGNED: In the study, five FEA models were utilised to represent healthy teeth and teeth restored with different substructure materials: (A) a healthy tooth, (B) a lesioned, root canal-treated, composite-filled tooth, (C) a lesioned, fiber-posted, zirconia-based crown, (D) a tooth with lesions, a fiber post, and Ni-Cr infrastructure crown, (E) a tooth with a lesion, a fiber post, and an IPS E-max infrastructure crown. A force of 100 N was applied at an angle of 45° to the long axis of the tooth from 2 mm cervical to the incisal line on the palatal surface. Deformation behaviour and maximum equivalent stress distributions on the tooth sub-components, including the bony structure for each model, were simulated.
UNASSIGNED: Differences were observed in the stress distributions of the models. The maximum stress values of the models representing the restorations with different infrastructures varied, and the highest value was obtained in the model of the E-max crown (Model E: 136.050 MPa). The minimum stress magnitudes were obtained from Model B the composite-filled tooth (80.39 MPa); however, it was observed that the equivalent stresses in all the models showed a similar distribution for all components with varying magnitudes. In periapical lesion areas, low stresses were observed. In all models, the cervicobuccal collar region of the teeth had dense equivalent stresses.
UNASSIGNED: Different restorative treatment methods applied to root canal-treated teeth with periapical lesions can impact the stress in the alveolar bone and the biomechanical response of the tooth. Relatively high stress values in the cortical bone at the cervical line of the tooth have been observed to decrease towards the apical region. This observation may suggest a potential healing effect by reducing pressure in the periapical lesion area.
UNASSIGNED: Composite resin restorations can be considered the first-choice treatment option for the restoration of root canal-treated teeth with lesions. In crown restorations, it would be advantageous to prefer zirconia or metal-supported prostheses in terms of biomechanics.