892 moraes

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892 moraes

  1. 1. Color evaluation of orthodonticelastic ligatures using a portablesphere spectrophotometerSOLDATI DC ; SILVA RC ; OLIVEIRA AS ; KAIZER MR ; MORAES RRSchool of Dentistry, Federal University of Pelotas, Brazil
  2. 2. Colorreadings:CIE L*a*b*parametersL a b1000+-+-Color variation: ΔE = (ΔL2 + Δa2 + Δb2)1/2∆L = L1 – L0 (final reading – baseline)∆a = a1 – a0 (final reading – baseline)∆b = b1 – b0 (final reading – baseline)
  3. 3. Portable Sphere Spectrophotometer(SP60 – EX-Rite / Grand Rapids, MI, USA)Munsell-like neutral value scale sheet backgrounds
  4. 4. View of the spectrophotometer withthe reflectance window openSample spot
  5. 5. Sample spotSimplified scheme ofthe spectrophotometerLight sourceLightintegrating sphereReflectance window
  6. 6. Sample spotGuidelinesGuidelinesSpecimenThe authors are grateful to Dr. Lisandra Mozzaquatro for support with the pictures
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