ABSTRACT
Objective@#To investigate the clinical effect of subcutaneous injection of nanofat combined with autologous fat into tear trough deformity to improve the mixed dark circle at lower eyelid, and the feasibility of using L*a*b* value to objectively evaluate the improvement of skin color at the lower eyelid with dark circle.@*Methods@#A total of 14 patients with the mixed dark circle at lower eyelid, admitted by Union Hospital of Tongji Medical College of Huazhong University of Science and Technology from November 2017 to August 2018 were selected. They were all female, aged between 21 and 46 years old. Thigh or abdomen was selected as the fat donor area. Autologous fat was filled into the tear trough deformity. The prepared nanofat was injected into the subcutaneous layer of the lower eyelid with dark circle. Photoes were taken under the same condition and same room temperature for patients before operation and 6 months after operation. Photoshop, CS7 exposure correction, as well as 64 Image J software measurement were adopted to evaluate the skin L* a* b* value at dark circle of lower eyelid. SPSS 20.0 rows of data statistical analysis was applied with paired t test(P<0.05).@*Results@#All patients were followed up for 6 months after the operation, and a satisfactory effect was achieved after one injection, with an overall satisfaction rate of 78.6% (11/14). The color and skin fine wrinkles at the dark circle of the lower eyelid were improved in 14 patients, and the contour of the injection area was smooth without obvious complications. 6 months after the operation, the L* value of the skin at the lower eyelid with dark circle was 55.13±5.56, which was 7.74±2.39 higher than the preoperative value of 48.23±5.63, showing significant difference(t=12.089, P=0.00). Six months after surgery, the a* value was 14.68±2.84, which decreased by 0.11±0.60 compared with 14.79±3.04 before surgery, showing no statistically difference(t=-0.71, P=0.49). Six months after surgery, the b* value was 19.77±3.45, which increased by 0.27±1.03 compared with 19.50±3.45 before surgery, showing no statistical difference (t=0.98, P=0.35).@*Conclusions@#Subcutaneous injection of nanofat combined with autologous fat injection for tear trough deformity is effective in the treatment of lower eyelid with mixed dark circle. The L*a*b* value can objectively evaluate the improvement of skin color at the lower eyelid with dark circle.
ABSTRACT
OBJECTIVES: The aim of this study was to evaluate the surface color of indirect resin restoration according to the layering placement of different shade of incisal composite. MATERIALS AND METHODS: In this study, CIE L*a*b* value of 16 Body composite of Tescera ATL (Bisco, Schaumburg IL,USA) was measured by spectrophotometer (NF999, Nippon Denshuku, Japan), and compared to CIE L*a*b* value of Vitapan shade guide. Nine shade Incisal composite of Tescera ATL were build-up to 1 mm thickness on Body composites inlay block, and CIE L*a*b* value was measured. Incisal composite was ground to 0.5 mm thickness and CIE L*a*b* value was re-measured. Color difference between Body composite and Incisal composites layered on Body composite was calculated as a function of thickness. RESULTS: Color difference between corresponding shade of Tescera Body composite and Vitapan shade guide was from 6.88 to 12.80. L* and b*value was decreased as layering thickness of Incisal composite on Body composite was increased. But, a* value did not show specific change tendency. CONCLUSIONS: Surface color difference between Body composites and Incisal composites layered on Body composite was increased as the layering thickness of Incisal composite increased (p < 0.05).