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Research Waste with Dr. Noorein Hajira

Dr. Noorein Hajira, resident in the Graduate Prosthodontics Program at the University of Toronto, spoke with Dr. John O’Keefe about the concept of Research Waste. 


  1. Research waste is a serious problem that may occur through several mechanisms. One aspect of research waste manifests when research articles addressing a topic exist but cannot be found readily by those who seek this information.
  2. Literature search may be hampered by inconsistent manner in which articles are indexed in databases. Search strategies must consider this inconsistency.
  3. Superficial literature search may not yield the desired information or the full scope of relevant articles. A good strategy is always to assume that the initial search has NOT yielded all the relevant or the most relevant articles.
  4. In depth literature search requires a broad approach focusing on multiple databases and multiple possible key words and index terms.


  1. Layton DM, Clarke M. Research waste: How are dental survival articles indexed and reported? Int J Oral Maxillofac Implants 2016;31(1):125-32.
  2. Layton DM, Clarke M. Will your article be found? Authors choose a confusing variety of words to describe dental survival analyses. Clin Oral Implants Res 2015;26(1):115-22.

Suggested Electronic Databases for Dental Literature search

  • MEDLINE / PubMed
  • Google scholar
  • Web of Science
  • Cochrane Library:
  • The Cochrane Database of Systematic Reviews
  • The Cochrane Central Register of Controlled Trials




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