title: Efficacy of Video-Assisted Instruction on Knowledge and Performance of Dental Students in Access Cavity Preparation.
abstract: BACKGROUND
  The conventional method of teaching endodontics has some drawbacks. Due to the small size of the oral cavity, students cannot closely observe the clinical procedure. Use of new teaching modalities such as the intraoral camera may obviate this problem. This study assessed the effect of video-assisted clinical instruction in dentistry (VACID) on dental student's knowledge and performance in access cavity preparation during endodontic treatment.
  
  
  METHODS
  In this interventional study, twenty six undergraduate students were equally divided into two groups and received instructions on access cavity preparationviaconventional demonstration (CD) or VACID using intraoral camera plus conventional demonstration. Students' knowledge was assessed before and after the demonstration. The scores obtained by students were compared between the two groups. Data were analyzed using the Mann Whitney U test.
  
  
  RESULTS
  No significant difference was found between the two groups in knowledge and performance scores of students about pulp chamber removal, under-extension, over-extension, gouging, perforation or finding the main and extra canals. However, use of intraoral camera significantly reduced the number of student visits to instructors for problem solving (P=0.001).
  
  
  CONCLUSIONS
  VACID is an effective educational method and as efficient as conventional demonstration in endodontics; as a result it can be used in combination with conventional teaching.
authors: Department of Endodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Mandana
authors: M
authors: Naseri
authors: Department of Endodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Yazdan
authors: Y
authors: Shantiaee
authors: Oral Medicine Department, Dental School, Mashhad University of Medical Sciences, Mashhad, Iran.
authors: Javid
authors: J
authors: Rasekhi
authors: Department of Endodontics, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran.
authors: Saeede
authors: S
authors: Zadsirjan
authors: Department of Endodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Maryam
authors: M
authors: Mojtahed Bidabadi
authors: Division of Endodontics, Department of Oral Biological and Medical Sciences, Dental School, University of British Columbia, Canada.
authors: Akbar
authors: A
authors: Khayat
keywords: Conventional Education; Endodontic Treatment; Knowledge; Performance; Video-Assisted