Shear Bond Strength of Ah26 to Human Dentin Treated with Dimethyl Sulfoxide (Dmso).

The purpose of this study was to examine the bond strength of AH26 to human coronal dentin exposed to DMSO. A total of 70 dentin specimens were equally divided into two groups. Each dentin surface was pre-treated with 2 mL of 2.5% NaOCl, 3 mL of EDTA 17%, and distilled water. One group was finally rinsed with 50% DMSO. Following the AH26 application, the bond strength was tested by subjecting the samples to a shear load at a crosshead speed of 0.5 mm/min using universal testing equipment. The results according to paired samples t-test indicated that there was a statistically insignificant difference between the two groups. Therefore, DMSO had no effect on the bond strength of AH26 root sealer to dentin.

Traditional and minimally invasive access cavities in endodontics: a literature review.

The aim of this review was to evaluate the effects of different access cavity designs on endodontic treatment and tooth prognosis. Two independent reviewers conducted an unrestricted search of the relevant literature contained in the following electronic databases: PubMed, Science Direct, Scopus, Web of Science, and OpenGrey. The electronic search was supplemented by a manual search during the same time period. The reference lists of the articles that advanced to second-round screening were hand-searched to identify additional potential articles. Experts were also contacted in an effort to learn about possible unpublished or ongoing studies. The benefits of minimally invasive access (MIA) cavities are not yet fully supported by research data. There is no evidence that this approach can replace the traditional approach of straight-line access cavities. Guided endodontics is a new method for teeth with pulp canal calcification and apical infection, but there have been no cost-benefit investigations or time studies to verify these personal opinions. Although the purpose of MIA cavities is to reflect clinicians' interest in retaining a greater amount of the dental substance, traditional cavities are the safer method for effective instrument operation and the prevention of iatrogenic complications.

Temperature Rise on the Plugger Surface of 2 Commercially Available Gutta-percha Heating Devices.

INTRODUCTION: The objective of this study was to examine the temperature rise on the plugger surface of 2 commercially available gutta-percha heating devices: the System B (Kerr Dental, Amersfoort, The Netherlands) and the System B Cordless Pack Unit (Kerr Dental). METHODS: Temperature changes were recorded by a Thermocouple Data Logger device (Pico Technology Ltd, St Neots, UK) and 2 thermocouples: the first to record the temperature on the plugger surface in an isolated polytetrafluoroethylene system and the second to record the base temperature of the environment. The gutta-percha heating devices studied were System B with F, FM, M, and ML pluggers set at the "use" position, "touch" mode, temperature of 200°C, and a power setting of 10 and the System B Cordless Pack Unit with the FM plugger set at low power. Two variables were extracted from the collected temperature data: the temperature on the plugger surface 10 seconds after activating each gutta-percha heating device (θ10) and the time required to reach 60°C (t60). The differences between the pluggers over those 2 variables were investigated using analysis of variance and the Tukey B test for post hoc comparisons (P < .05). RESULTS: The mean θ10 for all pluggers ranged between 73°C and 87°C. The mean t60 for all pluggers ranged between 1.3 and 3.3 seconds. No clinically significant differences between the pluggers were observed. CONCLUSIONS: The gutta-percha heating devices tested achieve maximum temperatures lower than 94°C and are capable of gutta-percha phase transformation within approximately 4 seconds of activation.

Percutaneous endoscopic gastrostomy as a tool to assist pneumatic dilation in a difficult case of sigmoid esophagus.

We describe a case of a long-standing, untreated achalasia with a huge sigmoid esophagus in a 58-year-old Caucasian man who declined surgery. All means of classical endoscopic approach for pneumatic dilation, including the use of an overtube, were impossible because any attempt to propel the balloon dilator made the guide wire pull back out of the stomach because of the large loops and the tortuosity of the esophagus. For this reason, we used, for the first time, a combined approach of percutaneous gastrostomy and endoscopy in order to fix the guide wire at two points, achieving a pneumatic dilation in this way. A few months later, a significant improvement in the symptoms and nutritional status of the patient were observed.