ABSTRACT
Objective To analyze the effects of Cavity Preparation Skill Evaluation System (CPSES) in pre-clinical dental cavity preparation assessment.Methods Twenty one dental undergraduates in Medical School of Nankai University were chosen in this study.After cavity preparation training,students' cavity preparation skills were evaluated systematically.The outline form and depth of 21 left mandibular first molar class Ⅰ cavity preparation made by students were evaluated by CPSES system and evaluators' visual assessment.The evaluation results were analyzed using GraphPad InStat statistical software(V3.1) with paired t test (test level α=0.05) and correlation analysis to study the application effects of the CPSES system.Results The evaluation results generated from CPSES system and evaluators' visual assessment for class Ⅰ dental cavity preparation skill evaluation showed significant difference(two tailed P value 0.0050,t=3.156) and certain correlation on cavity preparation assessment(two tailed P value 0.0837,r=0.386 2).Conclusion Application of cavity preparation skill evaluation system in undergraduate endodontic teaching can deepen and strengthen the students' understanding of cavity preparation requirements and help students master cavity preparation knowledge and skills better.
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<p><b>OBJECTIVE</b>To evaluate the outcome of endodontic microsurgery in 54 cases with persistent apical periodontitis.</p><p><b>METHODS</b>All surgical procedures were performed under a dental operating microscope after root canal treatment. Surgical procedures included periapical curettage, root-end resection, retropreparation with ultrasonic microtips, and root-end filling with mineral trioxide aggregate (MTA). Healing was monitored clinically and radiographically.</p><p><b>RESULTS</b>One year later, 31 (57.41%) cases were cured, 19 (35.19%) cases were improved, 4 (7.41%) cases were failure. There were no statistical difference between sex, age, tooth location, size of the lesion and pathological features (P>0.05).</p><p><b>CONCLUSION</b>The outcome of the present study indicates that endodontic microsurgery may result in a predictable treatment outcome in teeth with persistent periradicular lesions.</p>
Subject(s)
Humans , Aluminum Compounds , Apicoectomy , Calcium Compounds , Drug Combinations , Microsurgery , Oxides , Periapical Periodontitis , Root Canal Filling Materials , Root Canal Obturation , Root Canal Therapy , Silicates , Treatment OutcomeABSTRACT
Objective: To investigate the inhibitory effect of Flu or Protector on the demineralization of bovine enamel caused by some beverages. Methods: Forty bovine teeth were equally divided into experimental and control groups, each of them were subdivided into two groups. The enamel sp ecimens of the experimental group were pretreated with Fluor Protector and then exposed to carbonated drinks and fruit juice respectively,the enamel specimens o f control group were exposed to beverages directly. All the enamel specimens wer e exposed to beverages 5 times a day and for 5 minutes each time. After 7- day exposure,the concentration of calcium and phosphate in the beverages were measu red by EL 312e Micro-Plate. Results: The concentration of calci um and phosphate in the corresponding beverage of experimental group was lower t han that in control group in the same expossure time(P0.05).Conclusions: Fluor Protector can inhibit the demineralization of bovin e enamel caused by beverages.The inhibitory effect of Fluor Protector decreases as the exposure time prolonges.