[Cytocompatibility of Co-Cr ceramic alloys after recasting].

PURPOSE: To study the correlation between apical foramen area and accuracy of PropexII electronic apex locator under destroyed apical constriction. METHODS: Forty extracted teeth with single straight root canal were ground down 1 mm in the root tip and placed in 2% liquid agar gel injected into Castro model. The length of root canal was measured by PropexII electronic apex locator. The difference (L) between the electronic length (LP) and actual length was calculated. Imaging of apical foramen was recorded under microscope and apical foramen area (S) was measured by image processing software Photoshop CS. SPSS 22.0 software package was used to analyze the linear correlation and regression. RESULTS: With ±0.5 mm as the allowable range, all value of L was positive. The precise rate of PropexII was 52.5% when apical constriction was destroyed. There was a linear relationship between S and L (S=0.04+0.11×L，R=0.903）. CONCLUSIONS: The accuracy decreases when apical constriction is destroyed. The accuracy is worse when the apical foramen area is larger.

[Optimize visiting sequence and time-interval appointment of re-visiting patients in stomatology].

PURPOSE: To optimize visiting sequence and time-interval appointment mode to reduce waiting time of re-visiting patients in department of stomatology based on clinical data repository. METHODS: Waiting time data of re-visiting patients in department of stomatology was collected and divided into 2 groups. A total of 70897 patients from July 2014 to September 2014 were enrolled as experimental group (group year-2014), while 63960 patients from July 2013 to September 2013 were used as control group (group year-2013).Measurement data was compared with two-tailed independent-samples t test using SPSS 22.0 software package. RESULTS: The waiting time of group year-2014 was 73.65 minutes while it was 106 minutes for group year-2013. P value was 0,which meant the waiting time of group year-2014 was significantly less than group year-2013. CONCLUSIONS: Optimizing visiting sequence and time-interval appointment mode can reduce the waiting time of re-visiting patients in department of stomatology greatly. Supported by Innovation Research Training Project of Humanities and Social Sciences from Shanghai Jiao Tong University School of Medicine(wz1214).

[Optimal sequence algorithm of divided period appointment consultation service sequence for re-visiting patients in the department of stomatology].

PURPOSE: An optimal sequence algorithm model of divided period appointment consultation service was built through optimal sequence algorithm. METHODS: Re-visiting patients in the department of stomatology in a tertiary hospital were enrolled as the research objects in this study. Information about the diagnose term of common diseases, tooth positions treated, doctor's consultation hours were collected. After calculating the mean consultation hours of each disease based on the statistical analysis, the appointment consultation service sequence of re-visiting patients in the department of stomatology was optimized in accordance with the rule of "providing priority service to those requiring short consultation hours" by referencing to the theoretical model of parallel machine. RESULTS: The total waiting hours of patients after optimizing the appointment consultation sequence was decreased by 35.1%. CONCLUSIONS: Optimal sequence algorithm can optimize divided period consultation sequence, effectively shorten waiting hours and improve patients' medical experience.