AI Article Synopsis
- A study aimed to evaluate the fracture resistance of dental ceramics by comparing a custom load-to-fracture test with a conventional method for measuring fracture strength.
- Acoustic emission testing was used to assess fracture toughness in three types of dental materials (glass sheets, zirconia sheets, and monolithic zirconia crowns), with a total of 130 samples tested.
- Results indicated that the custom method produced lower mean fracture loads for all sample types compared to conventional testing, suggesting it may better detect cracks at lower loads, although more research is needed for broader applicability and accuracy.
Article Abstract
Aim: Evaluating the fracture resistance of dental ceramics is essential for assessing their behavior. This study aimed to validate a custom load-to-fracture test for assessing fracture strength compared to a conventional method.
Materials And Methods: Acoustic emission testing, a non-destructive (ND) lab test, was employed to evaluate the fracture toughness (FT) of brittle materials by capturing sound waves generated by crack formation in failing samples. A total of 130 samples, divided into three types (glass sheets, zirconia sheets, and monolithic zirconia crowns), were tested. The fracture loads were measured using both custom and conventional methods.
Results: The mean fracture loads for glass sheets were 650.46 N ± 110.38 (custom) compared to 691.41 N ± 155.92 (conventional). For zirconia sheets, the values were 95.25 N ± 7.78 (custom) vs 112.75 N ± 31.26 (conventional). Monolithic zirconia crowns showed mean fracture loads of 1108.99 N ± 327.89 (custom) compared to 1292.52 N ± 271.42 (conventional). Statistically significant differences were evident in all three types, indicating lower values with custom testing for all samples.
Conclusion: The custom testing demonstrated an advantage in identifying cracks at lower loads, thereby enhancing the accuracy of fracture load values. Despite its limitations, the study suggests that the custom setup could be a viable alternative to conventional fracture load testing of brittle materials. However, further testing with more materials is recommended to enhance the results' accuracy and generalizability.
Clinical Significance: The findings indicate that the custom load-to-fracture test can provide more accurate measurements of FT in dental ceramics, which is crucial for predicting their clinical performance and longevity. How to cite this article: Haddad C, Eng JG, Zoghbi AE. The Acoustic Emission Testing in the Evaluation of Fracture Toughness of Brittle Materials. J Contemp Dent Pract 2024;25(7):617-623.
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| http://dx.doi.org/10.5005/jp-journals-10024-3722 | DOI Listing |
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