Luting of ceramic crowns with a self-adhesive cement: Effect of contamination on marginal adaptation and fracture strength

Abstract

Objectives: This study evaluated the percentages of continuous margins (%CM) and fracture strength (FS) of crowns made out from blocs of leucite-reinforced ceramic (IPS Empress CAD) and luted with a representative self-adhesive cement (RelyX Unicem) under four contaminating agents: saliva, water, blood, a haemostatic solution containing aluminium chloride (pH= 0.8) and a control group with no contamination. Study Design: %CM at both tooth-cement (TC) and cement-crown (CC) interfaces were determined before and after a fatigue test consisting of 600’000 chewing loads and 1’500 temperature cycles changing from 5º C to 50º C. Load to fracture was recorded on fatigued specimens. Kruskal-Wallis test was used to compare %CM and FS between the five groups with a level of confidence of 95%. Results: At the TC interface, no significant differences in marginal adaptation before loading could be detected between groups. After loading, a significant marginal degradation was observed in the group contaminated with aluminium chloride (52 ± 22 %CM) in respect to the other groups. No significant differences in %CM could be detected between the groups contaminated with saliva, water, blood and the control. At the CC interface, no significant differences in marginal adaptation were observed between the groups. The FS on loaded specimens was around 1637N, with no significant differences between groups as well. Conclusions: An adverse interaction of the highly acidic haemostatic agent with either dentin or the self-adhesive cement could explain the specimens’ marginal degradation. The self-adhesive cement tested in this study was no sensitive to moisture contamination either with saliva, water or blood. Key words:Marginal adaptation, RelyX Unicem, contamination, all-ceramic crowns.

Incomplete Polymerization of Dual-Cured Resin Cement Due to Attenuated Light through Zirconia Induces Inflammatory Responses

“…The cement margin width of a milled zirconia crown typically ranges from 42 to 151 µm [ 22 , 23 , 24 ]. However, a significant marginal degradation of resin cement after the cementation of prostheses was observed [ 25 , 26 , 27 ]. Indeed, the eluted resin monomers from the marginal cement of the crown restorations luted onto the tooth samples were detected even with enough irradiation [ 28 ].…”

Bond strength of resin cements to leucite-reinforced ceramics: part 2 – after one-year aging in water

“…In addition, the pulp's inflammatory response is low and release of fluoride ions can be observed. Differently, the pretreatment of the ceramic restoration is necessary [10,13,18,19].…”

“…In a qualitative analysis, Slavcheva et al [18] evaluated the marginal adaptation and fracture strength of crowns made of ceramic reinforced with leucite (IPS Empress CAD / Ivoclar Vivadent) and cemented with a self-adhesive cement RelyX U200. Using thermal cycling as adhesive degradation method, they observed that there was no significant difference in the continuous margins that could be detected on the groups contaminated with saliva, water, blood, and control; as well as there was no difference in the marginal adaptation between the groups.…”