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This book gives a look on the effect of in office bleaching material on surface roughness and micro-hardness of four composite material ,and which of these materials did not altered by bleaching. To evaluate the effect of in office bleaching (SDI pola office +, 37.5% hydrogen peroxide) on the surface roughness and micro-hardness of four newly developed composite materials that are different in their filler type, load and resin matrix. These four materials are: - Filtek Z350XT (noanofilled, nanoclusters), 3M /ESPE, St. Paul, MN, USA. - Filtek Z250XT (nanohybrid), 3M /ESPE, St. Paul, MN, USA. - Filtek Z250 (microhybrid), 3M /ESPE, St. Paul, MN, USA. - Filtek P90 (Silorane -based composite), 3M /ESPE, St. Paul, MN, USA.

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Graduated in 2001 from college of dentistry university of Baghdad and get higher diploma degree in conservative dentistry 2006 and master degree in conservative dentistry in 2013 Member of Iraqi and Arab and IFEA endodontic society. worked in may health centers and specialized dental care centers, also in college of dentistry university of Baghdad

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