(PR116) Fracture Resistance of Endodontically Treated Premolars Restored With CAD/CAM Crowns

Objective: With the rapid introduction of new CAD/CAM materials, there is limited evidence on their performance when used to restore endodontically treated teeth. This study aims to evaluate the fracture resistance of endodontically treated premolars restored with CAD/CAM crowns made from various materials. The null hypothesis is that there will be no difference in fracture resistance between the test groups. Materials and

Methods: Maxillary and mandibular premolars (N=40) were endodontically treated using a crown-down technique with Vortex Blue rotary files, obturated with Kerr Zinc Oxide Eugenol sealer and gutta-percha cones and stored at 37°C for 24 hours. The teeth were then divided into four groups (n=10/group) based on CAD/CAM material: (1) eMax (positive control), (2) LAVA Ultimate (milled group), (3) Sprintray Ceramic Crown (3D-printed group), and (4) no treatment (negative control). Following cementation, all specimens were subjected to 5,000 thermal cycles between 5°C and 55°C. Fracture resistance was subsequently measured using a universal testing machine. Statistical analysis will be performed using ANOVA with a significance level of P< 0.05.

Results: The results are currently pending. Statistical analysis will determine any significant differences between groups.

Conclusion: Preliminary data suggest that various CAD/CAM materials may offer fracture resistance comparable to that of eMax, indicating their potential as viable options for restorative treatments in endodontically treated teeth. This study may support the broader use of these materials in clinical practice, expanding restorative options for durability and longevity in these cases.