Investigation of the effect of the application of different full ceramic materials on stress distribution to minimally invasive posterior fixed bridge restorations by finite element analysis

Aim: The aim of this study was to examine the effect of different types of all-ceramic materials used in various designs of partial posterior indirect restorations on stress distribution through finite element analysis. Methodology: Intact mandibular first premolar and first molar teeth were selected. After being soaked in saline solution for a week, 3D radiographic images were taken using cone-beam computed tomography (CBCT). Following root canal treatment, preparations were made for inlay restorations on both teeth. CBCT images were taken again after the preparations. Data from CBCT scans were used to create 3D models in the Mimics program. Restoration designs were prepared in Standard Tessellation Language (STL) format using the EXOCAD program. The models were transferred to SolidWorks for collision processes with cement designs and then exported in Standard for the Exchange of Product Model Data (STP) format. These files were imported into the ABAQUS program for finite element analysis, with properties assigned for each restoration type. Vertical forces of 600 N were applied to the occlusal surfaces, and stress values were recorded in Von Mises Stress (VMS) values. Results: The results of the study showed that the VMS value on inlay bridge restorations was lower in mesio-occluso-distal inlay (MODI) compared to MO-DOI. ZLS exhibited the lowest VMS value for enamel loads, while nano-hybrid composite ceramics with resin matrix (RMNH) showed the lowest stress distribution in the restoration material. In posterior adhesive indirect bridge restorations, material rigidity reduced tooth load distribution. Thus, MODI preparations are preferable due to reduced stress on teeth. ZLS is advantageous as the restoration material for minimizing enamel stress. Conclusion: In cortical and trabecular bone, similar values were found across all three restorations. The highest stress concentration, excluding the area around the restoration, was observed in lithium disilicate. How to cite this article: Aydın S, Tunçdemir AR, Mohammadi R, Demirel MG. Investigation of the effect of the application of different full ceramic materials on stress distribution to minimally invasive posterior fixed bridge restorations by finite element analysis. Int Dent Res. 2024;14(S1):28-35. https://doi.org/10.5577/indentres.572