The Effect of Screw Access Channel Design on Porcelain Fracture Resistance of Implant Supported Metal Ceramic Crown: An in Vitro Study

Authors : Dr. Swati Gupta; Dr. Krishna Priya Singh; Dr. Amrit Tandan

Volume/Issue : Volume 8 - 2023, Issue 9 - September

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Purpose: The aim of the study is to fabricate an implant crown for easy retrievability by designing a screw access channel(SAC) that does not compromises the fracture resistance of porcelain surrounding it.Materials and Method: The study was conducted on SACs of two coping designs of metal porcelain implant supported crown.The two group were (n10): Group I: metal ledge around SAC ; Group II: no metal ledge around SAC. The specimens were loaded universal testing machine with a cross-head speed of 2mm/min. Maximum values of loads at failure was recorded for each specimen. Mean values of fracture resistance for all groups were calculated and compared by using one-way ANOVA.Result: The mean value of load required to fracture for Group 2 i.e. 1822 N was significantly higher compared to Group 1 i.e 1077 N. The student t test revealed statistically significant difference between the two groups.Conclusion: The study concluded that SAC without metal ledge exhibited better porcelain fracture resistance as compared to SAC with ledge. Though both groups showed porcelain fracture resistance higher than normal masticatory force measured in the oral cavity.

Keywords : Screw Access Channel, Porcelain Fracture Resistance, Implant Supported Metal Ceramic Crown, Cement Retained Prosthesis, Screw Retained Prosthesis.


Paper Submission Last Date
31 - December - 2023

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