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Statement of problem: Although screw-retained implant crowns are commonly preferred by clinicians, there remain a limited number of studies on how color affected by screw color and access hole fill.   purpose: The purpose of this study was to  determine the influence of  screw color, opaque shade and composite thickness on the color of screw-retained implant crowns with use of digital spectrophotometer.   materials and methods: eighty specimens were divided into two groups ,gray group (pure titanium) and golden-colored group (anodized titanium) which used as two backgrounds. Composite discs with 1mm, 2mm,0.5mm opaque+0.5mm composite and 0.5mm opaque+1.5mm composite were fabricated. Titanium specimens and composite discs were placed into a collective mold in various tested groups for color measurements.   reSultS: Quantitative in concern to clinical color matching tolerance, It was found that, group 4A and 4B recorded the lowest ∆E as they could not detected by human eyes. Quantative color matching evaluation showed, no significant differences between gray and golden colored titanium(background), (P >0.05) while golden colored titanium gave higher ∆E than grey titanium group. For grey titanium; it was found that Group (4A) was the lowest ∆E value (1.20±0.4), followed by Group(2A) (4.00±1.3∆E), then Group (3A) (5.55±1.8 ∆E)while Group (1A) was the highest (7.6±2.53∆E) The difference in color change was significantly where (P= 0.001<0.05). For golden colored titanium; it was found that Group(4B) recorded the lowest ∆E value (1.15±0.38) followed by Group (2B)(3.65±1.26∆E) then Group (3B) (4.15±1.3∆E) while Group (1B) was the highest (5.55±01.8∆E). The difference in color change was significantly where (P= 0.0001<0.05).   conclusion: composite thickness and opaque shade composite affected ∆E values (p 0.05) of the color of final restoration.   clinical implications: Screw color and access hole fill play an important role on the color of screw-retained implant crowns. In present study, regardless the implant color, the use of 0.5mm opaque composite covered by 1.5 mm composite resin affected the color of final restoration significantly.

DIGITAL SPECTROPHOTOMETER EVALUATION OF THE INFLUENCE OF SCREW COLOR AND ACCESS HOLE FILL ON THE COLOR OF SCREW- RETAINED IMPLANT CROWNS