PubMed · 11199544
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M Hodosh. Potassium nitrate.. https://pubmed.ncbi.nlm.nih.gov/11199544/
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The purpose of this study was to compare the influence of the root canal status on the determination of the root canal length by an electronic apex locator in vital and necrotic canals and canals with root canal filling retrieval. One hundred seven teeth with a total of 171 canals with various contents (105 vital pulp, 47 necrotic pulp, and 19 retrieval of root canal filling materials) were measured for root canal length in vivo with the AFA Apex Finder. The distance between the file tip and the radiographic apex was also determined on radiographs. In 86% of the evaluated roots, the file tip position as indicated by the Apex Finder was located within 0.5 mm of a point 1.0-mm short of the radiographic apex. The Apex Finder showed higher accuracy for determining the apical constriction in vital canals (93.9%) than in necrotic canals (76.6%), and this difference was statistically significant (p < or = 0.05). The Apex Finder indicated the point -1 mm +/- 0.5 mm in canals with retrieval of root canal filling materials in 68.4% of these cases, but because of the small number of retrieval cases, this is not comparable statistically with vital and necrotic cases. The authors concluded that the AFA Apex Finder is highly accurate in vital canals.
PURPOSE: The aim of this retrospective study was to investigate the long-term outcomes of dental injuries. Subluxated and laterally luxated teeth were evaluated according to the findings of CO2 sensitivity, obliteration, pulpal sclerosis, and the duration of post-traumatic fixation of the injured teeth. MATERIAL AND METHODS: The data of 725 patients were analyzed retrospectively over a period of 14 years. Of these, 108 patients could be investigated for a long-term follow-up. Dental trauma was classified according to the degree of luxation (I-III). RESULTS: There was a significant correlation between the degree of luxation and the post-traumatic findings of CO2 sensitivity. There was no significant correlation between the degree of luxation and the post-traumatic findings of apical inflammation, pulpal sclerosis, and/or obliteration. Long-term fixation of injured teeth had no effect on the short- and long-term occurrence of pathologic processes at the root such as root resorption. CONCLUSION: The post-traumatic finding of CO2 sensitivity was related to the degree of luxation of the injured teeth. Apical inflammation, pulpal sclerosis, and obliteration were not related to the degree of luxation. The results suggest that long-term fixation of injured teeth has no negative effects on the long-term outcomes of subluxated and laterally luxated teeth.
This study was designed to evaluate whether resin embedded transparent teeth are as convenient to use as classical transparent teeth. For this purpose demineralized human teeth were divided into coronal and radical portions, and pulp tissue was extracted from the pulp chamber and root canals, into which drawing ink was injected. After dehydration, the specimens were made transparent in methyl salicylate and immersed in polyester resin. The divided portions were recombined at the polymerization. The resin embedded teeth maintained transparency and the black-stained pulp chamber and root canals showed morphological details. The resin embedded specimens could be handled manually and observed freely from any angle. Previously, transparent teeth have been observed in transparent media through a capped glass bottle. In this respect the resin embedding method is superior to the classical method. The new method will be helpful for investigating root canal morphology.