Evidence based practice
165
be a valuable source. MEDLINE is
the US National Library of
Medicine’s (NLM) premier bibliographic database. It can be accessed
free of charge via http://www.ncbi.nlm.gov/PubMed but is also
available through other database providers such as Ovid and
SilverPlatter.
Searching electronic
databases is a complex process, too detailed to
cover in this chapter, particularly as databases and service providers
Used for
Evaluating
the effectiveness of an
intervention
Randomised controlled trial comparing the
longevity and aesthetics of two restorative
materials
Controlled trial comparing the longevity of
simply repairing or replacing restorations
Measuring the incidence of a disease;
looking at the causes of disease; determining
prognosis
Cohort study looking at the progress of
carious lesions over time and relating this to
external factors such as smoking or diet
Looking at the causes of disease;
identification
of risk factors; suitable for
examining rare diseases
Case–control study comparing patients with
endodontic infection (cases) with patients
without (controls), looking at associated risk
factors
Measuring the prevalence of a disease;
examining the association
Cross-sectional survey of caries in young
adults in the North West of England
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