Effect of bleaching agents on sealing properties of different intraorifice barriers and root filling materials

Abstract

Objective: To evaluate the effect of intracoronal bleaching agents on the sealing properties of different intraorifice barriers and root filling materials. Study Design: The root canals of extracted human premolars (n=180) were prepared by using System GT rotary files and filled with either gutta-percha+AH Plus or Resilon+Epiphany sealer. In both groups, the coronal 3mm of root filling was removed and replaced with one of the following materials applied as intraorifice barriers (n=30/group): 1. ProProot-MTA; 2. Conventional Glass ionomer cement; and 3. Hybrid resin composite. In each subgroup, intracoronal bleaching was performed using either sodium perborate with distilled water or 35% hydrogen peroxide gel for 3 weeks. The leakage of specimens was measured using fluid-filtration and dye penetration tests. The data were analyzed statistically with One-way ANOVA, Repeated Measures t-test and Independent Samples t-test (p=0.05). Results: The fluid conductance values of the test groups were not influenced by the type of the bleaching agent, the intraorifice barrier, or the root filling material (all p>0.05). However, the extent of dye leakage was significantly affected by the type of intraorifice barrier material (p<0.05), which showed the following statistical ranking: glass ionomer cement > resin composite > ProRoot-MTA (p<0.05). Conclusions: The effect of 35% hydrogen peroxide gel or sodium perborate/distilled water on the sealing properties of tested intraorifice barriers and root filling materials varied conforming leakage assessment. These properties were not affected by using fluid filtration test, while the glass ionomer barrier showed the greatest amount of dye leakage in both gutta-percha and Resilon root-filled teeth. Key words:Tooth Bleaching, root canal filling materials, glass ionomer cement, mineral trioxide aggregate, micro leakage

Effect of Carbamide Peroxide on the Push-out Bond Strength of Different Composition Glass-Ionomer Cement to Root Canal Dentin when used as Cervical Barrier

“…The material evaluated by the push-out test and failure mode analysis can assess the dental bleaching materials effects on the cervical barrier with accuracy, in comparison to infiltration methods. 4,29,35,36 The cervical barrier using glass-ionomer cements may have different results depending on the bleaching agent chemical composition and/or application time at the cervical barrier of endodontically-treated teeth. However, future studies using the described methodology are needed to evaluate the best material for use as a cervical barrier in endodontically-treated teeth bleaching.…”

Infiltration of Rhodamin B into three materials used as cervical barrier

“…Various materials have been used for constructing the cervical cap, among them polycarboxylate cement, glass ionomer cement, zinc phosphate cement, resin cement, among others may be mentioned, at all times seeking a material that promotes the best sealing of the cervical region 9 . The sealing capacity of these restorative materials used as cervical barrier may be harmed by both the bleaching agent and the type of material used 15 . Different methods are used for evaluating marginal leakage of restorative materials, such a penetrant dyes [16][17] , transport of fluids 15 and microbiological tests 18. Rhodamin B dye has been used in various studies [16][17][19][20] for evaluating marginal leakage of restorative materials, because it has homogeneity and stability when in contact with other materials, and does not undergo discoloration.…”

Push-out bond strength of intra-orifice barrier materials: Bulk-fill composite versus calcium silicate cement

“… 4 , 5 For this purpose, different materials have been employed, including temporary filling materials, glass-ionomer cement, composite resin, MTA and IRM. 6 , 7 …”