Mehmet Selim Bilgin1, Ali Erdem1, Erhan Dilber2, İbrahim Ersoy3. 1. Department of Prosthodontics, Faculty of Dentistry, Sifa University, Izmir, Turkey. 2. Department of Prosthodontics, Faculty of Dentistry, Sifa University, Izmir, Turkey. Electronic address: dilberhan@gmail.com. 3. Department of Endodontics, Faculty of Dentistry, Sifa University, Izmir, Turkey.
Abstract
PURPOSE: The purpose of this study was to compare the fracture resistance of Co-Cr post-cores fabricated with 3 different techniques: traditional casting (TC), computer-aided design and manufacturing (CAD/CAM) milling (CCM) and direct metal laser sintering (DMLS). METHODS: Forty intact human mandibular premolar were endodontically treated. The roots were then randomly divided into four groups according to the post systems: the control group was only filled with gutta percha. Co-Cr metal posts were fabricated with TC, CCM and DMLS in the other three groups. The posts were luted with a resin cement and subjected to compression test at a crosshead speed of 1mm/min. The statistical analysis of the data was performed using one-way analysis of variance (ANOVA) and multiple comparison post hoc Tukey tests (α=.05). The samples were examined under a stereomicroscope with ×20 magnification for the evaluation of the fracture types. RESULTS: The mean fracture loads were 432.69 N for control, 608.89 N for TC, 689.40 N for DMLS and 959.26 N for CCM. One-way ANOVA revealed significant difference between the groups (p<0.01). In the post hoc Tukey test, there were significant differences between groups except DMLS and TC. CONCLUSION: While Co-Cr posts fabricated by TC and DMLS systems performed similarly in terms of fracture resistance, posts fabricated by CCM techniques showed higher fracture resistance values. SIGNIFICANCE: Co-Cr metal posts fabricated by CCM and DMLS could be an alternative to TC processing in daily clinical application.
PURPOSE: The purpose of this study was to compare the fracture resistance of Co-Cr post-cores fabricated with 3 different techniques: traditional casting (TC), computer-aided design and manufacturing (CAD/CAM) milling (CCM) and direct metal laser sintering (DMLS). METHODS: Forty intact human mandibular premolar were endodontically treated. The roots were then randomly divided into four groups according to the post systems: the control group was only filled with gutta percha. Co-Cr metal posts were fabricated with TC, CCM and DMLS in the other three groups. The posts were luted with a resin cement and subjected to compression test at a crosshead speed of 1mm/min. The statistical analysis of the data was performed using one-way analysis of variance (ANOVA) and multiple comparison post hoc Tukey tests (α=.05). The samples were examined under a stereomicroscope with ×20 magnification for the evaluation of the fracture types. RESULTS: The mean fracture loads were 432.69 N for control, 608.89 N for TC, 689.40 N for DMLS and 959.26 N for CCM. One-way ANOVA revealed significant difference between the groups (p<0.01). In the post hoc Tukey test, there were significant differences between groups except DMLS and TC. CONCLUSION: While Co-Cr posts fabricated by TC and DMLS systems performed similarly in terms of fracture resistance, posts fabricated by CCM techniques showed higher fracture resistance values. SIGNIFICANCE: Co-Cr metal posts fabricated by CCM and DMLS could be an alternative to TC processing in daily clinical application.
Authors: Håvard Jostein Haugen; Brandon Michael Soltvedt; Peter N Nguyen; Hans Jacob Ronold; Gaute Floer Johnsen Journal: Biomater Investig Dent Date: 2020-02-11