Análisis espectrofotométrico de los tejidos blandos periimplantarios

Resum

Objective: To evaluate the repeatability and reproducibility of gingival color measurements usinga digital spectrophotometer. Measurement error was estimated by determining the interrater agreementand by repeating measurements in different illumination environments with and without contact of thedevice with the gingiva (Study 1).To determine differences in peri-implant soft tissue color with the utilization of titanium, titaniumgold-plated, white zirconia, Vita Classical (VC) A4-shaded zirconia, and fluorescent white zirconiaabutments and to establish the influence of gingival thickness on the resulting color (Study 2).Methods.Study 1: Two trained examiners measured the gingival shade around 30 central incisors using aspectrophotometer with/without external illumination and with/without contact of the device with thegingiva. Color data obtained (CIELAB color coordinates; L*, c*, h*, a*, b*) were analyzed using theintraclass correlation coefficient (ICC) and the Student’s t-test for paired samples.Study 2: Four implants were contralaterally inserted in 19 fresh pig mandibles. CIELAB colorcoordinates lightness (L*), chroma along red axis (a*), and chroma along yellow-blue axis (b*) wereobtained at 1, 2, and 3 mm from the central axis of the peri- implant mucosal margin in apical direction.Mean values of L*, a*, and b* were used to calculate the color difference (ΔΕ = (L2 − L1)2 + (a2 − a1)2+ (b2 − b1)2)1/2) between the peri-implant soft tissue and the marginal gingiva of the adjacent tooth.After descriptive analysis of each color parameter, within and between group variations in theresulting color with different abutments were determined by repeated measures ANOVA, applyingDuncan’s correction for within-group factors. Interaction effects between soft tissue thickness and colorwere determined by performing another repeated measures ANOVA for independent measures with posthoc Bonferroni’s correction. Statistical significance was established at the 95% confidence level. Theinterrelationship of tissue thickness with L*, a*, b*, and ΔΕ was calculated using Spearman rankcorrelation coefficients...