heliosit and triethylene-glycol-dimethacrylate

The aim of this in-vitro study was to analyze the polymerization capacity of 5 orthodontic composites by determining the degree of monomer conversion (DC).. Fourier transform infrared spectroscopy was used to evaluate the DC of the orthodontic composites immediately after polymerization and after storage in artificial saliva at 37°C ± 1°C for 30 days. The resin-based adhesive composites investigated were Bisco Ortho (Bisco, Schaumburg, Ill), Heliosit Orthodontics (Ivoclar, Schaan, Liechtenstein), Kurasper F (Kuraray, Okayama, Japan), Light Bond (Reliance Orthodontic Products, Itasca, Ill), and Transbond XT (3M Unitek, Monrovia, Calif), cured with Elipar FreeLight 2 (3M ESPE, St Paul, Minn) for the testing of the DC values. Fifty cylindrical specimens were manufactured in molds. The data were analyzed by 2-factor analysis of variance (ANOVA) and Tukey HSD test.. According to 2-way ANOVA, the DC was significantly influenced by composite type (P <0.05); after 30 days, there were no differences among the composite types for the DC. The interaction of orthodontic composites and time played a statistically significant role in the DC (P <0.05), but there was no statistically significant influence of time for the DC (P >0.05).. The DC was found to change according to composite materials used, and Bisco Ortho showed the most DC performance. The DC of orthodontic composites is a complex process that is affected not only by inorganic filler content of the composite but also the monomer type and many other factors. Sufficient DC values of 5 commercially available orthodontic composites can be achieved with a new-generation light-emitting diode curing light.

Topics: Acrylic Resins; Bisphenol A-Glycidyl Methacrylate; Composite Resins; Curing Lights, Dental; Humans; Materials Testing; Orthodontics, Corrective; Phosphoric Acids; Polyethylene Glycols; Polymerization; Polymethacrylic Acids; Resin Cements; Saliva, Artificial; Spectroscopy, Fourier Transform Infrared; Temperature; Time Factors

Our aim was to evaluate the effects of staining solutions on the discoloration of orthodontic adhesives.. Six orthodontic adhesives were investigated (Transbond XT [3M Unitek, Monrovia, Calif, USA], Heliosit Orthodontic [Ivoclar Vivadent, Liectenstein], Light Bond [Reliance Orthodontic Products, Itasca, IL, USA], Bisco Ortho [Bisco, Schamburg, IL, USA], Quick Cure [Reliance Orthodontic Products, Itasca, IL, USA], and Filtek Supreme XT [3M ESPE, St Paul, Minn, USA]), and 5 beverages (tea, cola, coffee, red wine, and yogurt). Sixty specimens were prepared. Five specimens from each group were stored in each of the 5 staining solutions. The 5 remaining specimens from each group served as the controls and were stored in distilled water. The specimens were immersed in staining solutions and water at 37°C ± 1°C for 5 days. The test period was 25 days. Before and after the test period, color measurements were carried out with a spectrophotometer, and color changes (ΔE∗) were calculated. Statistical differences were evaluated by using analysis of variance (ANOVA) and the Tukey HSD tests.. Adhesive materials, staining agents, and their interactions were found to play statistically significant roles (P < 0.001) in color changes. Among the adhesive materials, the Light Bond water control group consistently showed the lowest ΔE∗ value for all materials, and the Filtek Supreme XT group showed the highest ΔE∗ value for all materials. After the in-vitro experimental process for staining solutions and water, unsatisfactory color stability was observed for the conventional adhesive systems except for Light Bond, Transbond XT, and Bisco Ortho water control group (ΔE∗ > 3.7), respectively.. In esthetically critical areas, discoloration of adhesive materials for fixed orthodontics can cause patient dissatisfaction. Orthodontic composites will discolor from staining beverages during their lifespan.

Topics: Bisphenol A-Glycidyl Methacrylate; Carbonated Beverages; Coffee; Color; Colorimetry; Coloring Agents; Composite Resins; Dental Cements; Humans; Imaging, Three-Dimensional; Materials Testing; Methacrylates; Orthodontic Brackets; Polyethylene Glycols; Polymethacrylic Acids; Polyurethanes; Resin Cements; Spectrophotometry; Tea; Temperature; Time Factors; Water; Wine; Yogurt