Influence of storage times on bond strength of resin cements to root canal

Abstract

The resin cements are responsible to retention of the indirect materials decreasing marginal leakage, increasing failure resistance compared with conventional cementation. The cementation within root canal is very hard due unfavorable conditions regarding the application of adhesive techniques caused by inadequate access. Therefore, considering the possibility to decrease steps of cementation, this study was performed to evaluate the bond strength of self-adhesive resin cement (RelyX TM U100, 3M ESPE) and resin cement combined with self-ecthing adhesive system (Panavia ® F 2.0, Kuraray) light-cured with Quartz Tungsten Halogen (QTH) following storage at 37 °C immediately after light-curing, 24 and 48 hours and 7 days. The root canals were prepared to receive the glass fiber post in the depth of 10 mm, irrigated with 17% EDTA and NaOCl, rinsed with distilled water and dried using paper points. The roots were perpendicularly sectioned into approximately 1 mm thick sections, obtaining ninety-six slices (n = 12). The slices were trimmed using a cylindrical diamond bur in the proximal surfaces until it touched the post and attached into a device, which were mounted on a strength tester (Bisco) and loaded in tension at a speed of 0.5 mm/min until failure occurred at specimens. The analysis of variance (ANOVA) and Tukey's post-hoc tests showed significant statistical differences (P < .05) to all resin cements immediately after light-curing and 24 hours, 48 hours and 7 days. The Panavia ® F 2.0 showed higher mean values than RelyX TM U100 for all storage times, however no different statistically significant was reported (P > .05). The resin cements 24 and 48 hours after light-curing were statistically similar among themselves (P > .05). The both resin cement showed similar bond strength into root canal on different storage times. The highest bond strength values of the resin cements were showed 7 days after curing.

Compressive strength of dental composites photo-activated with different light tips

“…To compare the ability of different light guide tips coupled to an LED to cure dental composite material, suitable tests had to be chosen. Although many methods for testing the physical properties of dental composites are known, most are orientated towards comparing the properties of the different materials rather than the LCUs [35][36][37]. Compressive strength tests have previously been used to compare different LCUs but specifically in the present study this test was employed to compare different light guide tips [38,39].…”

Indirect Resin Onlay Cemented with Self-adhesive Resin Cement: A Comprehensive Clinical Overview

“…15,16 The self-adhesive resin cement was chosen for luting of onlay planned because it does not require pretreatment of the dental substrate, reducing postoperative sensitivity and simplifying the cementation procedure. [17][18][19][20] Also it is verified that self-adhesive luting agents seem to successfully bond to dentin-restricted as well as to enamel-restricted cavities, predicting good clinical performance. 21 Some studies 22,23 reveal that self-adhesive resin cement has shown a acceptable clinical behavior.…”