Influence of various materials on biomechanical behavior of endocrown-restored, endodontically-treated mandibular first molar: A 3D-finite element analysis

Abstract

To evaluate the effect of restorative materials on stress distribution of endodontically treated teeth, the 3D models of an endodontically treated mandibular fi rst molar, restoration, and cement layer were created. Three different materials (composite resin, ceramage and ceramic) were studied and two loading conditions (vertical and oblique load) were simulated. Mohr-Coulomb failure criterion of enamel, dentine, endocrown and cement were evaluated separately. It is indicated that under both loading conditions, the highest values of Mohr-Coulomb failure criterion were observed in Ceramage-restored group for remaining tooth structure while in ceramic-restored group for the restoration. Compared to composite resin and Ceramage, ceramic endocrown transferred less stress, namely was more protective to the tooth structure.

Fracture Resistance and Retention of CAD/CAM Endo-Crowns Using Different Preparation Designs

“…Endocrown eliminate the need for posts and build up therefore they are less expensive, time saving and more practical (10) . Endocrowns were presented as a prosthetic treatment to restore root canal treated incisors (24) , premolars (25) and molars (26,27) with great tissue loss. The endo-core improves the bonding surface of restorations inside the root in addition to their macromechanical retention, decreasing their displacement from the root cavity under lateral stresses (28) .…”

Indirect Resin Composite Restorations Fabricated With Chairside CAD/CAM Systems

“…It was concluded that endocrowns had highest number of repairable fractures. Paradigm MZ100 Chen et al 31 Evaluation of influence of restoration material used on stress distribution of endocrown restorations of endodontically treated mandibular first molar teeth under vertical and oblique simulated by finite element stress analysis.…”

“…24 Studies evaluating the CAD/CAM restorations fabricated with different materials and techniques are presented in Table II. [25][26][27][28][29][30][31] It was concluded that for ceramic onlays proximal box elevation had no effect on either marginal integrity or fracture behavior. In terms of marginal integrity and fracture resistance composite onlays were found to be superior to ceramic onlays, specially in specimens without proximal box elevation.…”

“…Restorative materials available for chairside CAD/CAM system24 Studies evaluating the CAD/CAM restorations[25][26][27][28][29][30][31] …”

Physiological Response of a Natural Central Incisor Tooth to Various Loading Conditions: A 3D Finite Element Study

“…Such high failure rate can be associated with the lack of understanding of natural tooth structure and its behaviour under external loading. The artificial crowns are designed to have physical material properties similar or higher than those of the natural enamel, the hardest and stiffest material in the human body, unlike a multi-layered multi-stiffness natural tooth [13][14][15][16][17][18][19][20][21][22][23][24]. One of the periodontal ligamental connects the tooth to the mandibular bone and helps tooth movement [25].…”