Root apex sealing with different filling materials photopolymerized with fiber optic?delivered argon laser light

Abstract

The present study evaluates the seal quality in the apex delta of uniradicular teeth filled with light-cured materials (calcium hydroxide, glass ionomer, and Flow-Fill Magic composite). A total of 45 roots prepared by the endo PTC/Dakin technique were used. All sample restorations were light-cured with 488-nm argon laser light. A 200-microm optical fiber introduced into the root canal delivered 100 mW of light power to the filler material. The fiber tip was positioned 5 mm away from the apex. Light was applied for 20 s. After curing, the samples were immersed in a methylene blue solution for 24 h. Then the samples were cut longitudinally and analyzed under a stereoscopic microscope for dye infiltration. For the sake of comparison, an additional group of ten samples submitted to conventional treatment with EndoREZ root canal sealer was also analyzed. The samples sealed with calcium hydroxide or with the glass ionomer presented less dye infiltration, as compared to those sealed with the Flow-Fill Magic composite. All products activated by fiber optic-delivered light showed superior sealing quality when compared with the self-activated EndoREZ sealer.

An in- vitro comparative assessment of the sealing ability of AH ‎Plus sealer with different root canal nano sealers ‎

“…To evaluate apical microleakage, our study used the dye penetration test as it is considered the most popular, probably because it is a simple and reliable method (36) . In this study, methylene blue dye was used as it thought to have a molecular size similar to or smaller than that of bacterial products (37) .…”

Apical microleakage evaluation of system B compared with cold lateral technique: In vitro study

“…Numerous studies have evaluated the apical sealing ability of root canal fillings using methods such as dye leakage (12), electrochemical techniques (13,14), bacterial penetration measurement (15), radioisotope techniques (16) and fluid filtration techniques (17). The dye penetration test is the most popular, probably because it is a simple (18) and reliable method (19). Inspection of dye penetration in dentin allows the detection of poor adhesion of filling cements to the canal wall, giving evidence of possible pathways for bacteria and other contaminants (19).…”

“…The dye penetration test is the most popular, probably because it is a simple (18) and reliable method (19). Inspection of dye penetration in dentin allows the detection of poor adhesion of filling cements to the canal wall, giving evidence of possible pathways for bacteria and other contaminants (19). A dye penetration method was used in this study to evaluate the efficacy of the seal afforded by CLC technique and compare it with system B continuous wave condensation.…”

The effect of curing light and chemical catalyst on the degree of conversion of two dual cured resin luting cements

“…For camphorquinone-based resins, the activation emits a blue light in the wavelength range 400-500 nm with peak values at about 468 and 480 nm, depending on the monomer formulation, and it has an irradiance at up to 2,000 mW/cm 2 [21][22][23][24]. Furthermore, the argon ion laser has certain characteristics, such as low beam divergence, collimation, monochromaticity, coherency, absorption selectivity and fiber delivery ability, that make it particularly suitable for clinical use to cure resinous materials with a greater degree of cure and improved physical and mechanical properties [22,23,25]. Although these laser units may accelerate the cure of composites, they can promote a temperature increase at the light-curing tip [21].…”