微课结合翻转课堂在牙体牙髓病学实践教学中的应用

目的 探讨微课结合翻转课堂的教学模式在牙体牙髓病学实践教学效果中的作用.方法 选择第四军医大学口腔医院2016级所有23名五年制口腔医学专业本科生作为实验组,2015级所有20名五年制口腔医学专业本科生作为对照组,实验组在牙体牙髓病学实践教学中采用微课结合翻转课堂的教学模式,对照组采用传统教学法,研究起始时间为2019年9月至2021年1月.课程结束后比较两组学生实践理论和实践操作的成绩,并通过问卷调查评估实验组学生对微课结合翻转课堂的教学模式的认可度和满意度.结果 实验组实践成绩和总成绩均高于对照组,两组之间差异有统计学意义(P<0.05).问卷调查结果显示实验组学生对微课结合翻转课堂的教学模式具有较高的认可度和满意度,但也认为其不能完全替代传统的教学方法.结论 微课结合翻转课堂的新型教学模式有利于调动学生的学习积极性,提高教学效率,是提升牙体牙髓病学实践教学效果的一种有效方法.     

Do in vitro solubility studies on endodontic sealers demonstrate a high level of evidence? A systematic review

Objective: To systematically review the quality of evidence of available in vitro solubility studies on endodontic sealers according to prespecified evidence criteria.

Material and methods: This systematic review was based on the PRISMA guidelines and the AMSTAR measurement tool. A systematic duplicate search of the literature on endodontic sealer solubility studies was conducted in PubMed and Embase databases (until 18 October 2017). Mapping terms to subject headings and free text terms were used and combined with hand searching before exclusion of duplicates. Studies specifically dealing with endodontic sealer solubility were selected. The evidence level was graded (low, medium or high) independently by two investigators following systematic data extraction in pilot forms, which was based on prespecified evidence criteria and the modified CONSORT checklist for in vitro studies on dental materials.

Results: The search retrieved 1053 articles, from which 88 were assessed in full. From the 63 articles retained in the final analysis, 11 were classified as having moderate and 52 as low quality of evidence (0 high). The studies graded as low had low sample size (n?<?10) and/or insufficient details to allow replicability. Most of the studies did not conform to the modified CONSORT checklist and did not include parameters considered relevant in the prespecified criteria.

Conclusions: Existing in vitro studies on the solubility of endodontic sealers do not demonstrate a high quality of evidence. Most of these studies do not present systematic reporting nor employ relevant parameters prespecified in our evidence criteria.     

Aspergillus in endodontic infection near the maxillary sinus

IntroductionDiseases of the maxillary sinus have been associated with dental roots near the maxillary sinus that have undergone endodontic treatment.ObjectiveTo investigate the presence of filamentous fungi in patients with dental roots near the maxillary sinus who had apical periodontitis treated endodontically, and to alert practitioners that this could be a possible avenue of contamination of the sinus in patients who develop maxillary sinus infection.MethodsCross-sectional study in 60 palatal roots of the first maxillary molars near the maxillary sinus, that underwent endodontic treatment for apical periodontitis. After removal of the filling material, dentin shavings were collected and placed in test tubes containing Sabouraud dextrose agar and chloramphenicol. The phenotype was determined by macroscopic and microscopic examination of the colonies. For polymerase chain reaction, the primers ITS-5 and ITS-4 were used. The sequences obtained were compared with those deposited at GenBank using the Basic Local Alignment Search Tool program.ResultsFilamentous fungi were isolated from 6 of 60 canals (10%): Aspergillus niger (6.7%), Aspergillus versicolor (1.6%), and Aspergillus fumigatus (1.6%).ConclusionRoot canals near the maxillary sinus with endodontic treatment and apical periodontitis may exhibit positive cultures for filamentous fungi. Interested professionals should be alert, because these microorganisms have pathogenic characteristics that can cause disease of odontogenic origin in the maxillary sinus.     

CBCT髓室底3D重建在牙髓根尖周疾病中的应用

目的 分析评估采用CBCT(锥形束计算机断层扫描,Cone Beam Computed Tomography)进行髓室底3D重建在牙髓根尖周疾病中的应用价值.方法 对我院口腔科于2015年11月至2016年3月所做的15例磨牙CBCT使用OnDemand 3D Dental软件进行3D髓室底重建并分析图像,与传统CBCT断层图像进行对比,观察其在临床中的作用.结果 CBCT髓室底3D重建技术能为临床医生提供直观信息,显著提高诊治效率.结论 CBCT髓室底3D重建可明确髓室底情况,确定根管口位置,为根管治疗提供优于传统CBCT断层图像的直观信息.     

Effect of Low-level Laser Therapy on Postoperative Pain in Molars with Symptomatic Apical Periodontitis: A Randomized Placebo-controlled Clinical Trial

Introduction

In this clinical trial, we evaluated the effect of low-level laser therapy (LLLT) on postoperative pain in mandibular molar teeth with symptomatic apical periodontitis.

改良式情景模拟教学模式用于牙体牙髓病学临床前期教学的评价

目的: 评价改良式情景模拟教学在牙体牙髓病学临床教学中的应用效果。方法: 将40名学生随机分为实验组和对照组,每组20名。实验组应用改良式情景模拟教学法,对照组应用传统教学法,采用SPSS 18.0软件包对教学效果进行评价。结果: 实验组学生在采集病史、书写病历、临床操作的分数均高于对照组,差异具有显著性（P<0.05）。结论: 改良式情景模拟教学应用于牙体牙髓病学临床教学,其教学效果优于传统教学法,能使学生更好地掌握临床医疗要领并且能切身体会患者的感受,帮助学生提高学习的主观能动性。     

Comparison of the effects of TripleGates and Gates-Glidden burs on cervical dentin thickness and root canal area by using cone beam computed tomography

The search for new instruments to promote an appropriate cervical preparation has led to the development of new rotary instruments such as TripleGates. However, to the best of the authors'' knowledge, there is no study evaluating TripleGates effect on the “risk zone” of mandibular molars.

Objectives

: The aim of this study was to evaluate the effects of a crown-down sequence of Gates-Glidden and TripleGates burs on the remaining cervical dentin thickness and the total amount of dentin removed from the root canals during the instrumentation by using cone beam computed tomography. The number of separated instruments was also evaluated.

Material and Methods

: Mesial roots of 40 mandibular first molars were divided into 2 equal groups: crown-down sequence of Gates-Glidden (#3, #2, #1) and TripleGates burs. Cervical dentin thickness and canal area were measured before and after instrumentation by using cone beam computed tomography and image analysis software. Student’s t-test was used to determine significant differences at p<0.05.

Results

: No significant differences (p>0.05) were observed between the instruments, regarding the root canal area and dentin wall thickness.

Conclusion

: Both tested instruments used for cervical preparation were safe to be used in the mesial root canal of mandibular molars.