Comparison of Surface Hardness of Various Shades of Twinky Star Colored Compomer Light-cured with QTH and LED Units

Abstract

IntroductionColored compomers are a group of restorative materials that were introduced in 2002 to repair primary teeth, and they provide attractive color and ease of use in pediatric dentistry. The aim of this study was to evaluate the effect of QTH and LED light-curing units on the surface hardness of different colors of Twinky Star compomers.MethodsIn this experimental study, a composite resin (Z250, 3M, and USA), an ionosit compomer (DMG, Germany) with A3 shade and 8 different Twinky Star colored compomer (Voco, Germany) samples were used. In all, 100 samples were prepared with 10 samples in each group, i.e., 10 Z250 composite resin, 10 ionosit compomers, and 10 Twinky Star compomer samples of each color. The samples were prepared in a 4×4-mm Teflon mold. Half of the samples were light-cured with QTH and the other half with LED units. Then, the surface microhardness was measured by Vickers hardness test. The data were analyzed with IBM-SPSS version 22, using the t-test and ANOVA.ResultsTwo-way ANOVA showed that the mean surface hardness of the compomer samples cured with the QTH unit was significantly higher than that cured with the LED unit (p < 0.001). In each curing unit, surface hardness of some materials exhibited significant differences with the highest hardness being observed in the Z250 composite resin (650.35 ± 56.320) and the lowest hardness being detected in the ionosit compomers (461.10 ± 96.170). One-way ANOVA also showed that, among the different colors of the Twinky Star compomer, the lowest hardness with both units (QTH and LED) was observed in the gold color (214.32 ± 22.026 and 175.116 ± 15.918, respectively).ConclusionThe colored compomer and the type of light-curing unit affected the microhardnesses of the surfaces. Different colors of Twinky Star compomers exhibited different surface microhardnesses.

Polymerization characteristics of colored compomers cured with different LED units

“…Other studies suggested that differently colored compomers might have different proportions of glittering components, causing different hardness values. 17, 28 This suggestion may also explain the effect of including pigments on the depth of curing, resulting in a change in the hardness values of the material; thus, the silver-colored compomer samples had the highest Vickers hardness number in our study.…”

Structural and mechanical analysis of three orthodontic adhesive composites cured with different light units

“…32 On the other hand, other studies reported better polymerization with darker materials compared to lighter counterparts. [33][34][35] The Grēngloo™ Adhesive is a green paste with a colorchange property that changes its color to a translucent color when the adhesive increases to warmer body temperatures. This feature allows easier removal of excess adhesive flash during bracket bonding before curing and facilitates cleanup of the adhesive remnants after debonding once the adhesive is cooled with air or water.…”

Farkli Işik Kaynaklarinin Renkli̇ Kompomerleri̇n Mi̇krosertli̇ği̇ Üzeri̇ne Etki̇si̇

“…Çalışmamızda kullanılan farklı renklerdeki kompomerlerin formülasyonları aynı olduğu için polimerizasyon farklılıkları, farklı renkler için ihtiva ettikleri pigmentlerin türü ve miktarından kaynaklanıyor olabilir. 19 Üretici, twinky star ve glasiosite birleşiminin geleneksel kompomerlere benzediğini ve aralarındaki tek farkın yapıya eklenen pigmentler olduğunu belirtmiştir. Yüzey sertliğinin farklı renklerde değişmesi, pigmentlerin organik ya da inorganik olmasına ya da ışığın farklı renkler de farklı miktarda emilmesine bağlı olabilir.…”