Presentation Information
[P-58（E）]Comparison of mechanical properties in metal-ceramic implant-supported prosthesis fabricated by selective laser melting with different metal substructure design
*Sang-Ah Lee1, Kyung-Ho Ko1, Yoon-Hyuk Huh1, Chan-Jin Park1, Lee-Ra Cho1 (1. Department of Prosthodontics, Gangneung-Wonju National University)
[Objective]
Porcelain fracture is a common technical complication of metal-ceramic restorations. In implant-supported restorations, screw access channels facilitate maintenance but may weaken the structural strength of the crown. The substructure of the crown plays a crucial role in its stability, and its design can affect the ability of the crown to distribute load. However, there are limited studies on how the design of the metal substructure affects the success rate of restorations. Therefore, this study aims to evaluate the fracture strength based on the design of the metal framework for screw access channels and the substructure of the crown in implant-supported restorations.
[Method]
Crowns were fabricated and divided into groups based on the design of the screw access channel and the crown substructure. All crown specimens were cemented with resin cement and subjected to dynamic loading. Subsequently, using a universal testing machine, a static load of 0.5 mm/min to the crown-abutment complex mounted on a jig until initial fracture occurred, and the load value (N) at the point of fracture was measured. The measured values were analyzed using one-way ANOVA. Edge chipping test was performed using a Vickers hardness tester to analyze the edge chipping resistance based on the load and the mean distance from the edge in rectangular specimens.
[Results and Discussion]
The metal framework supporting the entire screw access channel exhibited the highest fracture strength, while screw access channels made entirely of porcelain exhibited the lowest fracture strength. Different fracture strengths were observed depending on the crown substructure. The design of the metal framework for the screw access channel and the crown substructure affects the fracture strength of the porcelain, with fracture patterns similar with those observed in clinical settings
[References]
1) Zarone F, Sorrentino R, Traini T, et al. Fracture resistance of implant-supported screw-versus cement-retained porcelain fused to metal single crowns: SEM fractographic analysis. Dental Materials 2007;23:296-301.
2) Wang CH, Wu JH, Li HY, et al. Fracture resistance of different metal substructure designs for implant-supported porcelain-fused-to-metal (PFM) crowns. Journal of Dental Sciences 2013;8:314-20.
3) Derafshi R, Farzin M, Taghva M, et al. The Effects of New Design of Access Hole on Porcelain Fracture Resistance of Implant-Supported Crowns. J Dent 2015;16:61-7.
Porcelain fracture is a common technical complication of metal-ceramic restorations. In implant-supported restorations, screw access channels facilitate maintenance but may weaken the structural strength of the crown. The substructure of the crown plays a crucial role in its stability, and its design can affect the ability of the crown to distribute load. However, there are limited studies on how the design of the metal substructure affects the success rate of restorations. Therefore, this study aims to evaluate the fracture strength based on the design of the metal framework for screw access channels and the substructure of the crown in implant-supported restorations.
[Method]
Crowns were fabricated and divided into groups based on the design of the screw access channel and the crown substructure. All crown specimens were cemented with resin cement and subjected to dynamic loading. Subsequently, using a universal testing machine, a static load of 0.5 mm/min to the crown-abutment complex mounted on a jig until initial fracture occurred, and the load value (N) at the point of fracture was measured. The measured values were analyzed using one-way ANOVA. Edge chipping test was performed using a Vickers hardness tester to analyze the edge chipping resistance based on the load and the mean distance from the edge in rectangular specimens.
[Results and Discussion]
The metal framework supporting the entire screw access channel exhibited the highest fracture strength, while screw access channels made entirely of porcelain exhibited the lowest fracture strength. Different fracture strengths were observed depending on the crown substructure. The design of the metal framework for the screw access channel and the crown substructure affects the fracture strength of the porcelain, with fracture patterns similar with those observed in clinical settings
[References]
1) Zarone F, Sorrentino R, Traini T, et al. Fracture resistance of implant-supported screw-versus cement-retained porcelain fused to metal single crowns: SEM fractographic analysis. Dental Materials 2007;23:296-301.
2) Wang CH, Wu JH, Li HY, et al. Fracture resistance of different metal substructure designs for implant-supported porcelain-fused-to-metal (PFM) crowns. Journal of Dental Sciences 2013;8:314-20.
3) Derafshi R, Farzin M, Taghva M, et al. The Effects of New Design of Access Hole on Porcelain Fracture Resistance of Implant-Supported Crowns. J Dent 2015;16:61-7.
