Background:In daily practice of dentistry, we use same instruments on many patients. Before use, all instruments must be cleaned, disinfected, and sterilized to prevent any contamination. Pre-cleaning and sterilization of some devices can be difficult because of their small size and complex architecture. Dental burs and endodontic files are such instruments. Dental burs come in a variety of shapes and sizes, all with highly complex and detailed surface features.Aim:To determine the effectiveness of various disinfectants and sterilization techniques for disinfection and resterilization of dental burs and endodontic files.Materials and Methods:The materials used for the study were dental burs and endodontic files. Disinfectants used were Quitanet plus, glutaraldehyde, glass-bead sterilizer, and autoclave. The sterility of used dental burs and endodontic files was analyzed. Burs and files that had been used were pre-cleaned, resterilized, and then tested for various pathogens. Each item was transferred by sterile technique into Todd-Hewitt broth, incubated at 37°C for 72 h, and observed for bacterial growth.Results:The present study shows that the endodontic files and burs sterilized by autoclaving and glutaraldehyde showed complete sterilization. Burs and files immersed in glutaraldehyde (2.4%) for 12 h showed complete sterilization, whereas Quitanet plus solution and glass-bead sterilizer showed incomplete sterilization.Conclusion:The present study results indicate that autoclaving and glutaraldehyde (2.4%) showed complete sterilization. Other methods cannot be relied upon for sterilization.
Aim:To evaluate the accuracy of working length determination of an electronic apex locator, IPEX, on vital uninfected teeth and teeth with radiographic evidence of periapical lesions.Materials and Methods:Twenty vital and uninfected teeth and 16 teeth with a single canal and matured apices and having radiographic evidence of periapical lesions of 5-10 mm were taken for this study. Access cavities were prepared and pulp was considered to be vital if bleeding was present upon entering the chambers. No. 15 k-type file was used to determine the working length. X-rays were taken to determine the working length using Ingle's method, followed by determination using the electronic apex locator, IPEX. Teeth were then observed under 45 × magnification using stereomicroscope. No 15 k-type file was maneuvered till the emergence of the tip was seen and the real length of the tooth was thus measured in the instrument up to 0.5 mm accuracy using stereomicroscope.Results:The data were duly collected and entered, and the statistical analysis was done using Student's t test. In uninfected teeth, IPEX was found to be more reliable than Ingle's radiographic technique, but this was not statistically significant. In case of teeth with radiographic evidence of periapical lesions, the radiographic method appeared to be relatively more dependable; however, this difference was not statistically significant.Conclusion:For rendering effective root canal procedure, both radiographs and electronic apex locators have important roles to play.
Local anesthetic agents are widely used in dentistry. It has major role in all field of dentistry especially in oral surgery, Pediatrics, Endodontics, Periodontics etc. The only drawback associated with LA is that occurrence of soft tissue anaesthesia can persist for three to five hours, while the procedure itself usually lasts for less than an hour. Patients experience limitation of function in terms of speech difficulty, drinking neating etc. All these events leave negative impact on minds of patients; hence they avoid visiting dental offices. In order to reverse these events, a new drug named OraVerse (phentolamine mesylate) is available to us. This drug is known for its LA reversal ability and effects of local dental anaesthetic.
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