Background: Repair of direct composites are less invasive than replacement, diminishing the risk of iatrogenic exposure of the pulp and the risk of detrimental to adjacent teeth, all in all, reducing the procession of the "restoration death spiral". Aim: This study aimed to evaluate the repair bond strength of aged resin composites using different surface treatments and bonding protocols. Materials and methods: A total of 45 discs (n=45) were fabricated of Nanohybrid composite measuring about 2.5 mm in height and 3.5 mm in diameter and were mounted in acrylic resin and subjected to 10,000 thermal cycles between 5-55 ̊ C with 30 seconds of dwell time in a thermocycler in order to simulate artificial ageing. All these samples were assigned into three groups (n=15) based on the surface treatment protocol. According to the bonding protocol, the samples in each group are further divided into three subgroups (n=5). After surface treatments of the aged composites, the application of bonding agent followed by new composite material was performed. All the samples were stored in distilled water at 37 ̊ C for 24 hours. The shear bond strength of the samples was measured using a universal testing machine at a crosshead speed of 1mm/min. Results: Among the groups, the mean bond strength in medium grain diamond bur and 37% phosphoric acid etchant with the universal bonding agent subgroup was higher 852.56±27.71 than the remaining groups. The lowest mean bond strength of 200.9±10.62 was observed in 37% Etchant with direct composite subgroup. Conclusion: Different combinations of surface treatments and bonding protocols affect shear bond strength differently. The highest shear bond strength values were achieved for the group where surface treatment was done with the combination of blue diamond bur and 37% phosphoric acid along with a universal bonding agent.
Aim: The aim of this study was to evaluate the sealing ability of mineral trioxide aggregate (MTA), Biodentine with and without Bioactive glass (BG) as furcation repair materials by ultraviolet (UV) spectrophotometric analysis. Materials and Methods: Forty extracted human maxillary molars (n = 40) were selected and decoronated 3 mm above the cementoenamel junction and 3 mm below it and a defect in furcation was created. The samples were then divided into 4 groups of 10 (n = 10) each, Group I: MTA, Group II: Biodentine, Group III: BG + Biodentine and Group IV: BG + MTA and the defect was treated with respective furcation repair material. All the samples were then immersed in 2% methylene blue solution for 24 h and later stored in 65% nitric acid solution. The solution obtained was subjected to centrifuge at 3500 rpm for 5 min. From this solution, 100 μl of the supernatant was collected, analyzed in UV spectrophotometer at 550 nm with nitric acid as the blank and readings were recorded as absorbance units. Results: All four groups exhibited a significant difference in dye absorbance values (P < 0.01). Group I, i.e., MTA showed the least dye absorbance values when compared with the other three groups. Data were analyzed using one-way analysis of variance and post hoc Tukey tests. The level of statistical significance was set at P < 0.05. Conclusion: Within the limitations of the study, it can be concluded that MTA had superior sealing ability than Biodentine, whereas BG + Biodentine showed better sealing ability when compared with BG + MTA.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.