Assessing the efficacy of various irrigation solutions in dissolving organic tissue.

For successful root canal treatment, adequate chemomechanical instrumentation to eliminate microorganisms and pulp tissue is crucial. This study aims to assess the organic tissue dissolving activity of various irrigation solutions on bovine tooth pulp tissue. 40 extracted bovine mandibular anterior teeth (n = 10) were used for the study. Bovine pulp pieces (25 ± 5 mg) were placed in 1.5 ml Eppendorf tubes. Each tooth pulp sample was then covered with 1.5 ml of different irrigation solutions, dividing them into four groups: Group 1 with freshly prepared 5% Boric acid, Group 2 with 5% NaOCl, Group 3 with Irritrol, and Group 4 with Saline. Samples were left at room temperature for 30 min, then dried and reweighed. The efficacy of tissue dissolution ranked from highest to lowest was found to be NaOCl, Boric Acid, Irritrol, and saline (p < 0.05). It was observed that the decrease in the NaOCl group was greater than the decrease in the Irritrol and saline groups, and the decrease in the Boric acid group was significantly greater than the decrease in the saline group (p < 0.05). It also emphasizes the need for future studies to further investigate the effects of Irritrol and Boric Acid on tissue dissolution.

Composite bond strength to intact enamel with current simplified adhesives.

PURPOSE: This study compared microtensile bond strength (µTBS) of six simplified adhesive systems and an etch-andrinse, one-bottle adhesive system to intact enamel. MATERIALS AND METHODS: Twenty-eight sound incisor teeth were cut at the cementoenamel junction (CEJ) under water cooling. The enamel surfaces were cleaned with pumice, randomly assigned to seven groups and treated with one of the following adhesives: Hybrid Bond (Sun Medical); AdheSE One (Ivoclar/Vivadent); One Coat 7.0 (Coltene/Whaledent); Danville Experimental (Danville Materials); Clearfil S3 Bond (Kuraray); G Bond (GC); and Prelude Total-etch (Danville Materials) as control. Composite resin (Clearfil AP-X, Kuraray) buildups were created and after 24 h, the teeth were sectioned into beams of 1.0 mm2 cross-sectional area. Each beam was tested in a microtensile tester (Bisco) at a crosshead speed of 1 mm/min. Data were calculated as MPa and analyzed by one-way ANOVA. Multiple comparisons were done using the Tukey test. RESULTS: µTBS values of adhesives to intact enamel were as follows (mean ± SD; different letters indicate statistically different groups, p < 0.05): Hybrid Bond: 15.62 ± 3.90a; AdheSE One: 17.29 ± 3.88ab; One Coat 7.0: 19.59 ± 3.95abc; Danville Experimental: 18.65 ± 5.33abc; Clearfil S3 Bond:20.89 ± 2.96bcd; G Bond: 23.49 ± 4.21cd; Prelude Totaletch: 25.79 ± 5.24d. CONCLUSIONS: Clearfil S3 Bond and G Bond showed bond strength similar to Prelude Total-etch (p = 0.064). The other simplified adhesives showed a similar performance (p = 0.239), however, µTBS values to intact enamel of these systems were lower than those obtained by Prelude Total-etch (p < 0.05).