Nihal Gamal Eldin Elkarmany , Nagwa Mohmmed Ali Khattab And Wael Hamada Ahmed,

ABSTRACT
Adverse Effects Of Dental Materials, Especially Metals, Have Been An Important Issue In Recent Decades. Aim Artificial Saliva. Aim Of Study: Assessment Of The Amount Of Nickel And Chromium Release From Stainless Steel Crowns In Artificial Saliva.

Materials and Methods: In This In Vitro Study, 200 Stainless Steel Crowns Were Divided Into Two Groups; 100 3M SSCs &100 Kids SSCs. They Are Further Subdivided Into 4 Subgroups With 2,4,6,8 Crowns In Subgroups I, II, III, IIV Respectively, Each Subgroup Composed Of 5 Samples. Samples Were Placed In A Polyethylene Jar Containing Artificial Saliva And Held In An Incubator At 37�C For Four Weeks. The Amount Of Released Ni & Cr Were Determined At 1stday,3rdday,1st,2nd And 3rd Week, Using A Graphite Furnace Atomic Absorption Spectrophotometer.

Results: There Was Measurable Release Of Ni And Cr Which Reached Maximum Level At The End Of 1stweek Which Was Statistically Significant (P < 0.05) And The Release Decline Gradually With The Increase Of Immersion Duration. There Were Significant Release Of Ni And Cr In Groups And Subgroups Of SSCs In All Time Intervals. Also There Was A Statistically Significant Positive Correlation Between The Total Ni And Cr Release In All Subgroups (r=0.888 And P=0.000). Conclusion: The Release Of Nickel And Chromium Was Very Much Low When Compared With The Average Dietary Intake Of Ni (200-300 Ppm/day) And Cr (50-200ppm/day), Therefore Were Not Capable Of Causing Any Toxic Effects.