EDJ

COLOUR STABILITY AND MICROHARDNESS OF ORMOCER BASED AND NANOHYBRID RESIN COMPOSITES WITH AND WITHOUT ACIDIC CHALLENGE: AN IN VITRO STUDY

Doha Mostafa, Heba Hamza And Ahmed El Zohairy,

ABSTRACT
Objective: The Study Was Conducted To Evaluate The Effect Of Acidic Beverages On The Color Stability And Microhardness Of Ormocer And Nanohybrid Resin Composites.

Materials and Methods: Thirty Disk-shaped Specimens (6X2mm) Of Each Of 2 Resin Composites, Admira Fusion And Grandio Were Prepared. The Specimens Were Then Divided Into 3 Subgroups Of 10 Specimens Each And Immersed In 3 Immersion Solutions (cola, Orange And Artificial Saliva) For 3 Hours Daily Over A 15-day Test Period. Color Of The Specimens Was Measured With A Digital Spectrophotometer Vita Easy Shade Using CIELAB Color Space And Microhardness Measurements Were Done Using Vicker�s Microhardness Tester. Pre And Post Immersion Measurements Were Taken And Statistically Analyzed.

Results: After Immersion, Admira Had More Color Change Than Grandio And Was More Affected By Cola. Also Admira�s Microhardness Was More Affected By Immersion In Cola Compared To Grandio. Conclusion: The Nanocomposite Grandio Compared To Ormocer Admira Was More Resistant To Color Change And Surface Microhardness Changes When Immersed In Acidic Beverages.

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