Chemical versus dual curing of resin inlay cements

Influence of Different Ceramics on Resin Cement Knoop Hardness Number

“…9,18 The KHN results were low and the self-curing component did not improve the KHN even after 24 hours (Table 3 and Figure 1). These results are in agreement with studies conducted by Hasegawa and others 18 and elBadrawy and others, 19 who reported that the self-curing component is not sufficient to induce conversion of dual-cured cement and achieve a high hardness number. This observation may help to explain why some zirconia-and alumina-based ceramic systems recommend the use of a chemically-activated resin cement (Panavia 21).…”

“…[21][22] The self-curing chemical component can play an important role in polymerization, especially in areas that are inaccessible to curing light. 19 This may explain differences in KHN values between the more translucent and more opaque ceramics. The behavior of the cement used in this study seems to depend more on light activation.…”

Effects of photocuring strategy on bonding of dual-cure one-step self-etch adhesive to root canal dentin

“…For dual-cure adhesive resins, it is of paramount importance that the resin surface is irradiated with sufficient light energy to ensure a high degree of polymerization, as the latter produces good adhesion 16,17) . Light energy is a unit that encompasses two factors: intensity of the light curing unit, also referred to as power density, and the duration of light application over a given area.…”

“…For this reason, it is important to irradiate dual-cure adhesives with sufficient light energy -through the post space -to minimize the adverse effects of uncured acidic resin monomers of one-step self-etch adhesives. Besides, the mechanical properties of dual-cure adhesives were also found to be affected by curing strategies 16,17) . Bond strength to the tooth substrate (enamel or dentin) depends on the mechanical properties of the adhesive resin, which means that dual-cure adhesives should be exposed to lightversus chemical activation alone -to ensure good bond strength 18,19) .…”

Avaliação dos ensaios de microtração, push-out e pull-out: resistência de união entre pino de fibra e dentina radicular, análise de elementos finitos e microscopia confocal

“…Desta forma, estes materiais na região cervical, então, irão se polimerizar principalmente pelas reações desencadeadas pela luz, enquanto que na região apical, via reações químicas. Já foi comprovado que as propriedades mecânicas de cimentos resinosos duais são melhores depois da fotoativação em comparação aos mesmos apenas quimicamente ativados (135) . Portanto as propriedades destes cimentos devem ser diferentes ao longo do conduto radicular devido a menor irradiância nas regiões mais profundas e pode ainda afetar a resistência de união destes com a dentina do conduto radicular (134,136) .…”