Journal of

Introduction: The core muscles of trunk are activated before movements of upper and lower limbs. Current evidence suggests that lose of stability in core region predisposes to second injury and appropriate exercise may reduce the risk of reinjury. This aim of this study was to evaluate the effect of eight weeks core stability exercises on dynamic balance, function and strength in athletes. after anterior cruciate ligament reconstruction.
Methods: This study was a randomized clinical trial. 26 athletes with a history of anterior cruciate ligament reconstruction were purposefully selected and randomly divided into experimental and control groups.the experimental group performed core stability exercises for eight weeks and the control group performed their daily exercises. Dynamic balance, isometric strength and function were meaured using Y balance test, hand held dynamometer and hop tests. Data were analyzed using SPSS vrsion16 software. Independent t-test was used to compare demographic characteristics and Mixed Repeated Measures ANOVA was used to compare the means of the two groups (p≤.05).
Results: The results of the present study showed significant improvement in dynamic balance (F=143.92, P=0.000), single-leg hop (F=68.25, P=0.000), triple hop (F=14.02, P= 0.001), knee flexor strength (F=50.21, P=0.000) and knee extensor strength (F=54.72, P=0.000) in the experimental group after eight weeks of core stability exercises.
Conclusion: Based on the results of present study, it is suggested to the specialists and trainers involed in the rehabilitation of athletes to use comprehensive and useful core stabilization exercises in the rehabilitation stages of knee injuries.

Introduction: Patients, oral health care staff anddentists are exposed to infections and infectious microorganisms during dental imaging. The aim of this study was to evaluate the knowledge and practice of general dentists in Yazd City about infection control during the preparation of intraoral radiographs.
Methods: This analytical cross-sectional study, examined the knowledge and practice of 81 active dentists in Yazd City who were selected based on convenience sampling method through a questionnaire. To analyze the data, SPSS 16 ,and Pearson's correlation coefficient as well as One-way ANOVA were used.
Results: The mean age of the participants was 36.45 ± 9.66 and their mean work experience was 10.03±8.28 years. The mean score of knowledge about infection control during intraoral radiographs was more than 50% and it was evaluated as moderate. There was no statistically significant difference between the mean score of dentists' knowledge in terms of gender (P=0.623), age (P=0.849), work experience (P=0.824) and the year of their graduation (P=0.860), but there was a statistically significant difference between the mean score of dentists' knowledge according to their university of study (P=0.015), so that Yazd School of Dentistry graduates had significantly less knowledge than graduates of other faculties.
Conclusion: Considering the importance of infection control in dental radiology and the mean score of dentists' knowledge in the present study, which was moderate, therefore, the need to improve dentists' awareness in this field is emphasized