In Vitro Evaluation of the Fracture Resistance of CAD/CAM Materials for Fixed Partial Dentures
Background: Computer-aided design/computer-aided manufacturing (CAD/CAM) materials have revolutionized dental restorations, offering enhanced mechanical properties and esthetic outcomes. However, the fracture resistance of various CAD/CAM materials used in fixed partial dentures (FPDs) remains a cru...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wolters Kluwer Medknow Publications
2025-06-01
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| Series: | Journal of Pharmacy and Bioallied Sciences |
| Subjects: | |
| Online Access: | https://journals.lww.com/10.4103/jpbs.jpbs_72_25 |
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| Summary: | Background:
Computer-aided design/computer-aided manufacturing (CAD/CAM) materials have revolutionized dental restorations, offering enhanced mechanical properties and esthetic outcomes. However, the fracture resistance of various CAD/CAM materials used in fixed partial dentures (FPDs) remains a crucial determinant of their clinical success.
Materials and Methods:
Three CAD/CAM materials—lithium disilicate, zirconia, and resin-based composite—were selected for the study. A total of 45 three-unit FPD frameworks (15 specimens for each material) were fabricated using standardized CAD/CAM protocols. The frameworks were cemented onto artificial abutments and subjected to thermocycling to simulate oral conditions. Fracture resistance was tested using a universal testing machine, applying a load at a crosshead speed of 1 mm/min until failure occurred. The fracture loads were recorded in Newtons (N) for statistical analysis.
Results:
The zirconia group exhibited the highest mean fracture resistance (1,800 ± 120 N), followed by lithium disilicate (1,200 ± 100 N) and the resin-based composite (900 ± 80 N). Statistical analysis using ANOVA revealed significant differences in fracture resistance among the groups (P < 0.05). Failure modes varied, with zirconia specimens predominantly showing cohesive fractures, while lithium disilicate and the resin-based composite exhibited mixed failure patterns.
Conclusion:
Zirconia demonstrated superior fracture resistance compared to lithium disilicate and the resin-based composite, making it a more reliable material for FPDs in high-stress areas. Lithium disilicate remains a suitable option for esthetic regions, while the resin-based composite may be limited to low-stress applications. These findings underscore the importance of material selection based on clinical requirements to ensure long-term success of FPDs. |
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| ISSN: | 0976-4879 0975-7406 |