الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Minimal cavity preparation of class II lesions and selection of a suitable restorative material are the optimal goals to obtain durable restorations. Glass ionomer cements choice as a restorative material have always been controversial due to their high surface wear and poor
mechanical properties. In 2015, Equia Forte Fil glass hybrid system was introduced to the market and advertised as a restorative material with high mechanical properties that can be used in class I, II and V restorations in primary and permanent teeth. The addition of its nanofilled coat to the surface improves its wear, fracture resistance and surface hardness.
This study aims to evaluate the effect of a nano-filled coat on the 3D wear and fracture resistance of a glass hybrid restoration after cyclic loading in class II restorations in
permanent teeth.
Compound occluso-mesial class II cavities were prepared in 44 premolars. Teeth were randomly allocated into 2 groups. group A: n= 22 teeth were restored with Equia Forte Fil plus Equia Forte coat. group B: n= 22 teeth were restored with Equia Forte Fil without its coat. All samples were subjected to fatigue by cyclic loading using ACTA type chewing
simulator (50,000 cycles). 3D images were obtained before and after cyclic loading using a digital scanner. The wear resistance was evaluated by 3D image super-impositioning
technique using CAD/CAM software. All samples were axially loaded till fracture utilizing a
universal testing machine. CAD/CAM qualitative evaluation of the uncoated group showed
massive amounts of wear when compared to the coated group. The coated group also
demonstrated a significantly higher surface wear and fracture resistance than the uncoated group
(P <0.0001).