Impact of Thermocycling on Marginal Adaptation and Fracture Strength of Two Types of All Ceramics Anterior Endocrowns | ||
| Egyptian Dental Journal | ||
| Volume 71, Issue 1 - Serial Number 4, January 2025, Pages 587-597 PDF (1.39 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/edj.2024.326186.3223 | ||
| Authors | ||
| mostafa elhoussieny mohamed* 1; Essam Fawzy Mahmoud2; hanaa farouk mohamed3 | ||
| 1Fixed Prosthodontics, Faculty of Dentistry, Minia University, Minia, Egypt | ||
| 2Instructor, Department of Endodontics, Faculty of Dentistry, Minia University, El-Minia, Egypt | ||
| 3Dental Materials, Faculty of Dentistry, Minia University, Minia City, Egypt | ||
| Abstract | ||
| ABSTRACT Aim: The goal of this study is to evaluate the impact of thermocycling on fracture strength and marginal adaptation of anterior endocrowns fabricated from two different types of lithium disilicate. Material and Method: Twenty-four freshly extracted human maxillary upper central incisors were selected from the outpatients' clinic of the surgery department, Faculty of Dentistry, Minya University. The teeth were divided into two groups: Tessera and Emax CAD. The teeth were prepared for endo-crown restoration, and the endo-crowns were fabricated using CAD/CAM technology. A thermal cycling simulation device was utilized to subject all the study samples to 5000 cycles,cold water bath immersion for 30 seconds at 5 degrees the hot water bath immersion for 30 seconds at 55 degree dewll time 10 seconds to simulate temperature fluctuations in oral cavity. Marginal gaps were measured pre- and post-cementation using a stereomicroscope at various points. Fracture resistance was evaluated by subjecting the specimens to compressive loading until failure. Statistical analysis was performed to compare the marginal gaps and fracture resistance between the two groups. Results: Both before and after cementation, the Tessera and Emax CAD groups' total marginal gaps did not differ significantly, according to the data. However, A considerable difference in fracture resistance was found., whereas Emax CAD exhibited more resistance in contrast to Tessera. The improved mechanical characteristics, chemical makeup, and microstructure of Emax CAD are responsible for its increased resistance to fracture. | ||
| Keywords | ||
| Keywords: Thermocycling; fracture strength; marginal gap lithium disilicate; restorative dental materials | ||
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