No abstract

No abstract

No abstract

Objective: The aim of this study was to evaluate the ability of a new irrigant solution QMix, in the microbial reduction of Enterococcus faecalis from infected root canals in comparison with sodium hypochlorite 5.25%. Materials and Methods: 40 extracted mandibular premolars with single root canal have been prepared with rotary protaper instrument until F3 and irrigated with saline, and then they were sterilized by moist heat sterilization at temperatures 121°C for 20 min. After that, they were injected with 50 μ of Enterococcus faecalis suspension in the density of 10 8 , and then the root canals were incubated in a temperature of 37°C for 7 days in aerobic and anaerobic conditions. Next, the root canals were divided into two groups. Group 1 is irrigated with sodium hypochlorite 5.25%, Group 2 is irrigated with QMix. Each specimen was irrigated for 40 s, and the solution was left inside the canal for 30 s. The bacterial swabs were taken by sterilized paper points in two stages; the fi rst one was after the end of incubation period, and the second one was immediately after the irrigation. Student's t-test and Chi-square test were used to compare bacterial reduction Log(10) values between the groups. Results: Sodium hypochlorite was more eff ective than QMix (P < 0.05). There were no signifi cant diff erences in the bacterial reduction Log(10) percent between anaerobically and aerobically incubated roots in sodium hypochlorite 5.25% solution group (P > 0.05), whereas bacterial reduction Log(10) percent in anaerobically incubated roots were lower than those of aerobically incubated roots in Qmix solution group (P < 0.05). Furthermore, the percentage of full cleansing in the sodium hypochlorite group was greater than those of Qmix solution group (P < 0.05). However, the percentage of full cleansing in the QMix group was zero. Conclusions: Sodium hypochlorite 5.25%, had clear ability on the microbial reduction of E. faecalis in comparison with the new irrigant QMix.

Aim:The aim was to evaluate the post-operative sensitivity (POS) of composite and amalgam restorations performed by 4 th and 5 th grade undergraduate dental students (under supervision) at Syrian Private University, and determine the possible relationship between POS and restorative material type, preparation depth, and cavity classifi cation. USPHS sensitivity evaluation was done after 24 h, 1 week, 1 month, and 2 months. Results: POS for amalgam restorations (18.1%) was higher than composite restorations (9%) in all periods (P < 0.05). A statistically insignifi cant higher sensitivity was observed in Class II (16.9%) compared with Class I (13.3%) in all periods (P > 0.05). POS in deep preparations (22.6%) was higher than medium (14.6%) and shallow (8.8%) depth preparations in all periods (P < 0.05). Regardless of restoration type, POS appeared in 36.5% after 1 day and it was decreased till almost disappeared after 2 months. Conclusions: (1) POS for amalgam restorations was more than composite restorations. (2) Cavity design has no infl uence over POS. (3) The more the cavity depth, the more the POS. (4) POS decreased within time.