Evaluation of thermal cycling and mechanical loading on bond strength of a self-etching primer system to dentin

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

“…In addition, the shrinking material will pull the opposing walls of the cavity closer together, thereby increasing the stresses generated at the bonded walls. 5,7,17 Several studies 9,11,12,23,32,33 have revealed lower bond strength when the bulk technique is used to restore Class I cavities, as this highly stressful configuration maximizes the competition between the polymerization shrinkage and the adhesion between resin and dentin. Furthermore, Z revealed the highest maximum shrinkage stress rate and the shortest time to reach it (Table 4); this finding can additionally explain the inverse relationship between the tested bond strength and the cavity configuration of this material.…”

“…7 When restoring cavities with high C-factor, the resultant stresses put resintooth interfaces under severe tension as there is less chance for relaxation of shrinkage stress. 8 It has been reported by several investigators [8][9][10][11][12][13] that the increase in C-factor is associated with progressive weakening of the bond strength. Therefore, the strength of the adhesive interaction with tooth structure should be able to counteract the generated polymerization stresses.…”

“…The available data regarding bond strength in cavities with different Cfactors have either compared the bond strength in box-like cavities (C5) to a flat bonding surface (C1) without showing the effect of other cavity configurations [9][10][11]23 or were evaluated against an artificial substrate for bonding. 24 The main results from these studies indicate a negative effect of increasing the Cfactor on dentin bond strength.…”

Ağiz Ortaminin Si̇mülasyonu Açisindan Termal Ve Loading Si̇klusun Önemi̇

“…Nikaido ve ark. 25 ise, düz dentin yüzeylerine uygulanan restorasyonlarda, mekanik yüklemenin bağlanma dayanımına etkisinin olmadığını ve restorasyonla dentin ara yüzündeki kalitenin mükem-melleĢtirilmesi için, bağlanma dayanımının, in-vitro olarak incelenmesinde dönüĢümlü yük yüklemesi ile mikro-tensile bağlanma dayanımı testlerinin birlikte kullanımının uygun olduğunu rapor etmiĢlerdir. Loading siklus test cihazında tur sayılarını gösteren digital göstergesi üzerinden örneklere uygulanacak dönüĢümlü yük yüklemesinin tur sayısı 500-50.000 arasında ayarlanabilmektedir.…”

Degradação de interfaces adesivas formadas após desmineralização e desproteinização da dentina

“…Infelizmente, este tipo de análise é de difícil execução por demandar muito tempo e ter um custo elevado (NIKAIDO et al, 2002). Assim testes in vitro são considerados importantes por avaliar, num curto espaço de tempo, a eficiência da adesão de sistemas adesivos, apresentando uma boa correlação com os estudos in vivo ( VAN MEERBEEK et al, 2003).…”