Journal of pharmacy & bioallied sciences · 2025
In Vitro Evaluation of the Fracture Resistance of CAD/CAM Materials for Fixed Partial Dentures.
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Reddy Papala Sesha, Doddamani Mallikarjun H, Singh Ngangbam Johnson, Arya Ashtha, Vijayakanth K, Veerakumar Vignesh
Аннотация
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.
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.