ABSTRACT
Inappropriate antibiotic's prescription by dentists has caused several worldwide problems in recent decades. Antibiotics are the most commonly medicine that prescribed by dentists. Inappropriate antibiotic's prescription causes: Development of simultaneous infections, mutations, genetic transmissions and bacterial resistance to antibiotics. The purpose of this study was to evaluate dental student's attitude toward antibiotic therapy in endodontic treatments in Tehran's dental universities in 2009.In this descriptive study, 203 dental students selected by random from Tehran's dental schools. All interviewed students passed theoretical endodontic courses. Validity and reliability of the designed questioner assessed by following tests: Lawshe test [CVR=0/4], Cronbach Alpha Coefficient [0/8] and these tests approved by 3 psychiatrists. The results evaluated by X2 test. The attitude of students regarding antibiotic therapy in endodontic treatments was as follow: completely incorrect [0%], completely correct [15.2%], correct [62.2%] and incorrect [22.6%]. According to the results of the present study, there was no ideal point in dental student's attitude toward antibiotic therapy in endodontic treatments
ABSTRACT
A large number of instruments and techniques have been introduced for preparation of canals, specially in curved canals. It's claimed that FlexoFile Golden Mediums can provide more proper canal preparations. This study aimed to evaluate the efficiency of FlexoFile Golden Mediums in decreasing apical transportation during preparation of simulated curved blocks. In this experimental study, fifty simulated resin blocks with 40°Curvature were divided in two groups. 25 canals were prepared using K-FlexoFiles and the others were prepared using K-FlexoFiles and FlexoFile Golden Mediums. Anticurvature Passive Stepback technique with pull and push motion were applied for both of the groups. The amount of resin removal from inner and outer walls of the canals was measured by using superimposed computerized pre and postoperative photographs. Results were evaluated by Mann - Whitney statistical analysis. The amount of resin removal from the inner and outer walls of the canals were assessed milimetric in 11 mm length from the apex. In the three areas of 7, 8 and 9 mm from apex, the amount of resin removal from the outer wall in the experimental group was more than the control group [P<0.05]. There was no significant difference in the other areas both in inner and outer walls between two groups. FlexoFile Golden Mediums in spite of using more instruments, had less apical transportation, and are recommended for preparation of curved canals
Subject(s)
Root Canal Preparation/instrumentation , Denture, Partial, Fixed, Resin-BondedABSTRACT
An adequate film thickness is an important property of an endodontic sealer, when used in combination with gutta-percha, ensuring an hermetic three- dimensional root canal obturation. Film thickness also affects the sealing ability of scalers. The aim of the present study was to compare the film thickness of the following five root canal scalers: RSA, Topseal, 2SeaI, AH26 and Acroseal in Islamic Mad University at 2006. In this experimental study all root canal scalers were mixed following mixing procedures advised by manufacturers. A small amount of sealer was placed between two glass plates and a load of 200 gr was applied vertically on the top glass plates for 10 minutes. After setting, the thickness of scalers was measured with a set of digital calipers accurate to 0.01mm. The procedure was repeated ten times for each sealer[n=10]. The all data were analyzed by One-way ANOVA and Tukey HSD tests. The mean film thickness [mm] were respectively: AH26=0.36 +/- 0.020, Acroseal=0.37 +/- 0.019 Topseal= 0.41 +/- 0.014, 2Seal=0.38 +0.014 RSA=0.040 +/- 0.018 AH26, 2SeaI and Acroseal showed We best results, but differences among the three groups of scalers were not statistically different. RSA and Topseal showed the highest film thickness and a statistically significant difference was noted among these scalers and the others, hut difference among RSA and Topseal was not statistically different. All root canal scalers had acceptable film thickness, but AH26 showed the least film thickness