Aims: To investigate the incidence of handpiece asepsis in general dental practice in Mosul City and to evaluate the problems associated with routine handpiece sterilization which are commonly needed by those practitioners. Materials and Methods: A questionnaire was designed to collect the information about handpiece asepsis techniques performed by dentists. One hundred twenty dentists in Mosul City were randomly selected and the data were analyzed. Results: About 55.8% of the respondents know about the importance of handpiece sterilization, but no one do ideal sterilization between each patient due to absence of sufficient number of handpiece and lack of autoclave system in clinics. No one disinfect the handpiece scientifically; 59.38% smear the handpiece between each patient by one of the antiseptic solutions. Conclusion: Handpiece asepsis in Mosul dental clinics is poor. Most of dentists depend on disinfection by disinfectant solution to prevent cross infection by handpieces. Most dentists, because of their poor equipment in both private and national clinics, cannot sterilize handpieces after each patient.
Aims: the aim of this in vitro study was to evaluate the apical sealing ability where the canals are prepaid by two rotary NiTi systems. Materials and Methods: Thirty-six extracted human teeth with single root cut there crowns at the cemento-enamel junction CEG. The working length was determined for each tooth. The teeth were divided in to (3)groups ten of each. Group I the teeth were instrumented with ProTaper NiTi then the teeth obturated with matched-taper single cone. Group II of teeth were instrumented with RaCe NiTi rotary instrument and then obturated with matched-taper single cone. Group III were instrumented by hand instruments K-files and obturated by the lateral condensation techniques. Six teeth were divided as positive and negative control group three for each one. Tgadeseal was used as root canal sealer in this study. Adye penetration method was used to evaluate the apical seal using steromicroscope at 40X magnification. One-way analysis of variance and Duncan's test were used for statistical analysis. Results: The statistical analysis of the results demonstrated that there was no statistically significant difference in Microleakge between the two different rotary instrument each ProTaper and RaCe. While there was significant difference between the rotary instrument and the Hand instrument K-files. Conclusions: The use of the NiTi rotary instrument for root canal preparation showed the least apical microleakage, in compaired with hand instrument.
Aim: To evaluate the effectiveness of canal size change on the penetration level of endodontic irrigant solution. Materials and Method: Five canals of different sizes (20, 25, 30, 35 and 40) were tested by preparing Class I cavity in the apex. Paper point was placed in this cavity and sealed 4 mm by sticky wax. Irrigation was done by methylene blue solution 15 times for each canal size, then the paper point piece examined under stereomicroscope for discoloration and wetness. Results: The irrigant solution was penetrated up to the apical area of the all canal sizes in the all 15 irrigation trials. The volume of fluid, the degree of fairing, the use of apical patency files, and the needle depth were the other different factors improving penetration depth of irrigating solution. Conclusions: There was no effect of canal size on the penetration level of the endodontic irrigant.
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