Assessment of fracture resistance of enamic superstructure compared to porcelain fused to metal : An in vitro study / Marwa Nour Eldien Mahmoud Ali ; Supervised Rabab Mohammed Ibrahim , Hanaa Ibrahem sallam

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Marwa Nour Eldien Mahmoud Ali

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TextLanguage: English Publication details: Cairo : Marwa Nour Eldien Mahmoud Ali , 2016Description: 118 P. : photographs ; 25cmOther title:

تقييم مقاومة الكسر لتعويضات الزراعة المصىعة من الإيىاميك مقارنة بالتعويضات السيراميكية المغِلفة للمعدن : دراسة معملية [Added title page title]

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Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics Summary: Aim of this study was to assess the fracture resistance of enamic superstructure compared to porcelain fused to metal superstructure under different loading protocols (axial and non axial). Twenty implant represent maxillary first premolar were embedded in clear autopolymerizing acrylic resin. The test group was divided into two main groups according to the superstructure type, Group I: (n = 10) implants received cement retained hybrid ceramic (Enamic) superstructures and Group II: (n = 10) implants received cement retained porcelain fused to metal (PFM) superstructures. Each group was further subdivided into two subgroups according to the load direction, Subgroup (A): (n = 5) received axial load and Subgroup (B): (n = 5) received non axial load (loading at 45{u00B0}on palatal cusp). Samples were tested to failure by applying load using universal testing machine. Subsequently, the mode of failure of each specimen was identified and the bending moment was calculated. Statistical analyses were performed using two way ANOVA used and Independent t-test. Then one way ANOVA used followed by Tukyes post hoc test. Two way ANOVA showed that superstructure materials and different loading directions had a significant effect on mean fracture resistance (N) at p {u2264} 0.001. PFM superstructure under axial loading showed the highest statistically significant fracture resistance values (1326.36 ± 120.18N) while enamic superstructures under non axial loading showed the least statistically significant fracture resistance (478.67 ± 75.70N) among the tested groups. No significant difference between other three groups. All types of implant supported superstructures tested in this study have the potential to withstand physiological occlusal force in the premolar area 450N

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Item type	Current library	Home library	Call number	Copy number	Status	Date due	Barcode
Thesis	قاعة الرسائل الجامعية - الدور الاول	المكتبة المركزبة الجديدة - جامعة القاهرة	Cai01.09.09.M.Sc.2016.Ma.A (Browse shelf(Opens below))		Not for loan		01010110071080000
CD - Rom	مخـــزن الرســائل الجـــامعية - البدروم	المكتبة المركزبة الجديدة - جامعة القاهرة	Cai01.09.09.M.Sc.2016.Ma.A (Browse shelf(Opens below))	71080.CD	Not for loan		01020110071080000

Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics

Aim of this study was to assess the fracture resistance of enamic superstructure compared to porcelain fused to metal superstructure under different loading protocols (axial and non axial). Twenty implant represent maxillary first premolar were embedded in clear autopolymerizing acrylic resin. The test group was divided into two main groups according to the superstructure type, Group I: (n = 10) implants received cement retained hybrid ceramic (Enamic) superstructures and Group II: (n = 10) implants received cement retained porcelain fused to metal (PFM) superstructures. Each group was further subdivided into two subgroups according to the load direction, Subgroup (A): (n = 5) received axial load and Subgroup (B): (n = 5) received non axial load (loading at 45{u00B0}on palatal cusp). Samples were tested to failure by applying load using universal testing machine. Subsequently, the mode of failure of each specimen was identified and the bending moment was calculated. Statistical analyses were performed using two way ANOVA used and Independent t-test. Then one way ANOVA used followed by Tukyes post hoc test. Two way ANOVA showed that superstructure materials and different loading directions had a significant effect on mean fracture resistance (N) at p {u2264} 0.001. PFM superstructure under axial loading showed the highest statistically significant fracture resistance values (1326.36 ± 120.18N) while enamic superstructures under non axial loading showed the least statistically significant fracture resistance (478.67 ± 75.70N) among the tested groups. No significant difference between other three groups. All types of implant supported superstructures tested in this study have the potential to withstand physiological occlusal force in the premolar area 450N

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