First untoward events and reasons for tooth extraction after nonsurgical endodontic treatment in Taiwan

In this study, 857 teeth having undergone nonsurgical root canal treatment (NSRCT) in Taiwan in 2000 were evaluated during a 5-year follow-up period for first untoward events and reasons for tooth extractions. First untoward events occurred in 83 (9.7%) teeth during this follow-up period, and nonsurgical retreatment was performed for 20 (24.1%), 4 (4.8%) received apical surgery, and 59 (71.1%) were extracted. By the end of this 5-year follow-up period a total of 64 (7.5%) teeth had been extracted. There were 65 reasons for tooth extraction given by the 56 performing dentists who responded to the extraction reason questionnaires; 6 (10.7%) were attributed to endodontically related diseases, 15 (26.8%) to periodontal diseases, 26 (46.4%) to large decay or unrestorable tooth, and 18 (32.1%) to tooth fracture. The conclusion was that 7.5% of the NSRCT teeth were extracted by the end of the 5-year follow-up period, and only 10.7% of these teeth were extracted as a result of endodontically related diseases.     

Real time balanced turbo field echo Cine-MRI in the analysis of deglutition events and transit times

Investigation of swallowing is an important part of oral diagnosis. It usually plays a role in the aetiology of some orofacial deformities and open-bite as well as in the relapse of treated open-bite patients. In recent years, the movements of the anatomical structures that participate in deglutition have been investigated by several methods such as cineradiography, electromyography, electropalatography, electromagnetic articulography and ultrasonography. However, all these techniques have various disadvantages. Recently, dynamic magnetic resonance imaging has become available in the evaluation of swallowing function. In this study we intended to present this new technique to the dental literature and aimed to obtain dynamic images of the deglutition process. We also compared the timing of events in subjects with anterior open-bite and normal overbite during swallowing 10 mL water.     

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