Journal of Medical and Dental Sciences最新文献

During the past 10 years, residency training in otorhinolaryngology-head and neck surgery (ORL-HNS) in Japan, especially at university hospitals, has emphasized subspecialization, resulting in insufficiencies in basic surgical techniques with an extreme bias toward acquiring subspecialty surgical case experience. To address this problem, we developed a target-oriented program intended to achieve a more balanced approach to surgical training and performed a 1-year trial of the program at the Jikei University School of Medicine. Fourteen residents with 1 to 4 years of ORL-HNS experience completed the trial. Each resident's competencies in six basic surgical procedures were assessed on the basis of the number of cases handled by the resident, and each resident's case selection bias after implementation of the target-oriented training was examined. The case selection bias in the trial group residents was reduced and their balance in case experience was shown to be improved in comparison with that in control group residents who were trained in the conventional way. In addition, opinion surveys of the participants and supervising otorhinolaryngologists (trainers) indicated that they felt that the new training system had been effective in improving the balance in case experience and improving motivation, and creating greater awareness of training goals and progress.

Background: To identify the clinical T stage by endoscopy is a major diagnostic goal for superficial esophageal squamous cell carcinoma (ESCC). The completion of a microvascular morphological study of mucosal lesions is necessary to optimize therapy.

Materials and methods: Images of 197 intra-papillary capillary loops (IPCLs) captured by magnified endoscopy from 15 esophagectomy specimens were studied for their morphological features and IPCL dimensions.

Results: The microvascular morphology was classified into four basic major patterns: 1. spiral loop, 2. wide loop (WL), 3. globular (G) and 4. reticular pattern. The microvascular features and dimensions differed according to the depth of tumor invasion. Especially the mean bundle outline (IPCL diameter) showed significant changes as 20.02, 22.32, and 27.08 μm, respectively, for M1, M2 and M3, respectively (M1:M2 P < 0.05, M2:M3 P < 0.01).

Conclusions: During tumor stage progression, a high-volume blood demand and cancer cell overgrowth to occupy the laminar propria mucosa (LPM) cause obvious elongation, thickening, branching, irregularity and deformity of the IPCL, which were characteristics of M3 lesions. The results of the present study support and can be applied with the current Japanese classification for improving the diagnostic accuracy, especially to differentiate between M2 and M3 lesions based on the endoscopic findings.

In prosthodontic treatment, reconstruction of a proper occlusal contact relationship is very important as well as reconstruction of a proper interproximal relationship and marginal fitness. Unfortunately, occlusal relationships are sometimes lost in the process of occlusal adjustment of crowns. The purpose of this study was to compare the occlusal contacts of single crown fabricated by two different types of impression techniques. Nine subjects, whose molars required treatment with crown restoration, were enrolled in this study. Full cast crowns were fabricated using two types of impression techniques: the conventional impression method (CIM) and the bite impression method (BIM). The occlusal contacts of crowns were precisely evaluated at the following stages: after occlusal adjustment on the articulator (Step 0), before occlusal adjustment in the mouth (Step 1), after occlusal adjustment at the intercuspal position (Step 2), and after occlusal adjustment during lateral and protrusive excursions (Step 3). The number of occlusal contacts of the crowns on the functional cusps fabricated with BIM was significantly greater than that with CIM after occlusal adjustment. For this reason, the crowns fabricated with BIM might have a more functionally desirable occlusal surface compared to the crowns fabricated with CIM.