PubMed · 9482092
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R A Glenner. 1995. Plastic instruments.. https://pubmed.ncbi.nlm.nih.gov/9482092/
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Hypodermic needles have sharp cutting edges along their bevels. These can be used to enlarge canal openings and to cut around a broken instrument or other object to be removed. Means of attaching the needle to such foreign objects for removal are discussed.
This study investigated the ability of a new instrument designed for root debridement, the Periosonic, to remove dentine compared to a hand curette and an ultrasonic scaler. The Periosonic system is a modification of the Micro-Megax endodontic system and uses modified files to remove plaque, calculus and tooth substance. The Periosonic has 2 file types; the Periosonic 1 is a more aggressive file for the removal of gross supra- and subgingival deposits, while the Periosonic 2 is a thinner more flexible file used for the removal of subgingival deposits. 40 human dentine specimens were ground flat and baseline measurements were made using a surfometer. The specimens were divided into 4 experimental groups and each group was treated with a hand curette, ultrasonic scaler, Periosonic 1 or 2 using 12, 1-s strokes. The specimens were remeasured blind in the surfometer. The curette removed 23.6 microm of dentine, the ultrasonic 6.8 microm, the Periosonic 1 18.8 microm and the Periosonic 2 12.5 microm. A qualitative assessment of the samples following mechanical preparation was also made. In conclusion, the Periosonic instrument does not remove more tooth substance than a conventional curette and may be a useful addition for the debridement of root surfaces.
AIM: An experimental comparison of the Root ZX apex locator with the real measurement of the root canal length was carried out using a saline gel to simulate the periodontium. METHODOLOGY: Lengths were taken when the needle reached the 0.5 mark and the Apex mark on the meter. These measurements were then compared with a calculated reference length representing the real length of the root canal. Reliability was assessed using Student's t-test. Precision was assessed using the mean and standard deviation of differences. RESULTS: The Root ZX gave measurements within a range of 0.5 mm in 84.72% of the cases. The intra-operator and inter-operator variabilities were not statistically significant (P > 0.05). CONCLUSIONS: The Root ZX is not capable of detecting the '0.5 mm from the foramen' position and thus, should only be used to detect the foramen (major diameter).