Estudio In Vitro para evaluar el cambio cromático de la resina de nanorrelleno Filtek z350 XT con tiempos de fotopolimerización de 20 y 40 segundos sumergida en café

Abstract

Composite resins in recent years have been chosen as a preferred material for both the patient and the professional, due to excellent aesthetics, texture and strength. However, these properties can be affected by mismanagement in their placement, an insufficient time of photopolymerization results in a low degree of conversion of the resin monomer making it more permeable to the stains coming from the oral cavity, altering the initial color of the resins. Aim: This experimental study In Vitro, aimed to analyze the chromatic change of nanorellene resin, in relation to the polymerization time of 20 and 40 seconds. After the dive to coffee. Method: 50 resin disks were made, divided into two groups, the first group was photopolymerized with a time of 20 seconds and the second group was photopolymerized with a time of 40 seconds, the samples were submerged in coffee for 15 Minutes, after this time the samples were cleaned with water and brush, then stored in amber bottles. The color evaluation was performed at 7 days, repeating the daily submersion procedure. Results: These were statistically evaluated using the non-parametric test for related Wilcoxon samples, in addition to determining the difference of groups in the frequency of changes we used the Chi-Square test and finally to determine the difference of the exchange levels between the groups was applied U-Mann Whitney test. These showed that in the first study group there was a mean color change of 10.84 (SD = 0.37), while in the second study group the mean change was 0.48 (SD = 0.87), according to the scale Of the Vita Classic color guide, using the spectrophotometer (VITA Easyshade® Advance 4.0-Germany). Conclusion: The color variation was higher for the group of photopolymerized discs in 20 seconds, where a statistically significant change was reported